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Original Research ARTICLE

Front. Energy Res., 09 November 2020 |

Evaluating Sulfur-Composite Cathode Material with Lithiated Graphite Anode in Coin Cell and Pouch Cell Configuration

  • 1National Laboratory Astana, Nazarbayev University, Nur-Sultan, Kazakhstan
  • 2Department of Chemical and Materials Engineering, Nazarbayev University, Nur-Sultan, Kazakhstan
  • 3Institute of Batteries LLC, Nur-Sultan, Kazakhstan
  • 4Research Institute for Energy Equipment Materials, Hebei University of Technology, Tianjin, China

High-performance sulfur-composite cathode material, sulfur/polyacrylonitrile/ketjen black, was prepared by simple mixing and low-temperature heat treatment route. The cell made of the composite cathode and anode from metallic lithium or lithiated graphite was assembled in coin cell configuration. Half-cells retained about 70% of their initial capacity of 1,270 mAh g−1 after 150 cycles, while full-cells retained about 85% of the initial capacity of 1,500 mAh g−1 for over 150 cycles. Since coin cells do not reflect the true performance of a practical cell, the cathode composite was assembled with lithiated graphite anode in a 45 × 85 × 6 mm3 pouch cell configuration. This cell retained about 81% of its initial capacity for over 100 cycles. At high cycling rates up to 1 C, the pouch cell demonstrated a moderate rate capability and exhibited good recovery and stable performance after high rate cycling. Also, the cell successfully passed safety tests such as overcharge, deep discharge, and mechanical short circuit tests.


Li-ion batteries (LIBs) based upon nickel-rich layered transition metal oxide cathodes LiNi1−x−yMnxCoyO2 (NMC, x + y < 0.5) and graphite anodes are ubiquitous cells of several battery manufacturers. LIBs deliver high energy density (> 200 Wh kg−1) and stable cycle performance (> 1,000 cycles), as long as problems like flammable liquid electrolytes, overheating, extreme temperature failure, overcharge, and deep discharge are appropriately managed by designing a thorough battery management system (Rahimi-Eichi et al., 2013; Nitta et al., 2015). This, of course, along with increasing prices for nickel and cobalt, adds to the price of the battery at the pack level and the required progress toward the cost of energy storage < 100 USD kWh−1 for electric vehicles, unmanned aerial vehicles, and portable devices are still ongoing. In addition, in order to reach 500 Wh kg−1 energy density at the cell level, investigation of the possibilities of replacing graphite anode with Li-metal is one of the pursuits of many researchers (Albertus et al., 2017; Choudhury, 2019; Liu et al., 2019a; Yasin et al., 2019). However, the problems such as Li-metal consumption, dendrite formation, electrolyte contamination, and volume change upon cycling still have not been resolved entirely.

In order to enhance electrochemical performance, compensate the battery cost, and ensure safety at the cell level, various technologies are under development such as nonflammable polymer electrolytes (Croce et al., 1998; Wang et al., 2019; Wei et al., 2019), solid electrolytes (Liu et al., 2019b; Zhao et al., 2019), lithium/sulfur (Li/S) batteries (Aurbach et al., 2009; Liang et al., 2016; Seh et al., 2016), and others (Girishkumar et al., 2010; Omampuliyur et al., 2015). Li/S batteries are considered as next-generation batteries, which offer a high theoretical energy density of 2,500 Wh kg−1 with a very competitive price at the cell level (70 USD kWh−1) (Hagen et al., 2015). Although several groups have claimed good capacity and cyclability with sulfur-composite cathode materials, many of them have used coin cell configuration whose properties cannot be translated into practical pouch cells (Cheng et al., 2017; Liu et al., 2019a). In coin cells, the electrolyte is overflooded (> 10 μL mg−1 of cathode), and the Li foil that is usually used as a counter electrode is very thick (> 250 μm), whereas in practical pouch cells, the electrolyte content should be limited and Li-metal should be as thin as possible in order to reach high energy densities of 500 Wh kg−1. In addition, uneven current distribution in the practical cell causes Li dendrites to grow, which in turn may short-circuit the cell and hinders its long-term operation (Cheng et al., 2017). Therefore, a newly developed cathode material, after testing in a coin cell, needs to be tested in a pouch cell configuration to verify its practicality.

One of the most popular ways of a sulfur cathode material preparation is a formation of a sulfur-carbon composite. For example, a multiwalled carbon nanotube/nano-S cathode exhibits excellent electrochemical performance, but it is composed of expensive MWCNT and nano-S (Yuan et al., 2009). Several sulfur/conductive polymer/conductive carbon ternary composites have been developed and offer an inexpensive alternative, yet their properties can be further optimized (Liang et al., 2016). For instance, polypyrrole-coated sulfur/ketjen black (S/KB) with 1,047 mAh g−1 initial discharge capacity decays in the performance during cycling due to the dissolution of polysulfides (Nakamura et al., 2016). The composites of sulfur with conductive polymer-polyacrylonitrile have been intensely investigated because it exhibited a capability to accommodate the sulfur volume change upon cycling, prevent polysulfide dissolution, and act as conductivity enhancer (Wang et al., 2002; Peng et al., 2017). Moreover, sulfurized polyacrylonitrile composite offers stable specific capacity, which is very close to the theoretical value of elemental sulfur and the simpler reaction mechanism avoiding long-chain polysulfide reaction, and offers chemical compatibility with LiPF6-carbonate-based electrolyte with high Coulombic efficiency and low self-discharge (Zhang, 2014; Hara et al., 2015). Figure 1 shows the reaction mechanism of sulfur/polyacrylonitrile (S/PAN) composite after the first and subsequent cycles, which has been proposed by Wang et al. (2018). The S-S bond is cleaved in the first discharge process, and subsequent S/PAN becomes conjugative with thiyl radical. This radical structure forms an ion-coordination bond which enables a fast Li-ion transfer mechanism. In this work, a mixture of sulfur/polyacrylonitrile/conductive carbon has been utilized to fabricate a composite cathode material that was evaluated in coin cell and pouch cell configuration. Testing in pouch cell configuration offers valuable insight into the feasibility of the composites for full-scale battery application. Here, we prepared sulfur/polyacrylonitrile/ketjen black (S/PAN/KB) composite by simple mixing of sulfur, KB, and PAN, followed by heat treatment in Ar environment. The preparation procedure is simple and offers opportunities for the most industrially suitable scale-up methods.


FIGURE 1. S/PAN reaction mechanism with radical and ionic intermediates. Adapted with premission from Wang et al. (2018). Copyright (2018) American Chemical Society.

The successfully prepared S/PAN/KB composite cathode was tested in coin cell configuration both in half-cell configuration using Li-metal anode and in full-cell configuration using lithiated graphite as the anode. The full-cell configuration showed better cycling performance than the half-cell one because of a stable solid electrolyte interface (SEI) layer formed at the prelithiated graphite anode. The initial discharge capacity of the cell was about 1,500 mAh g−1, which is about 90% of the theoretical capacity of the sulfur anode, and the cell showed very stable electrochemical performance.

As the behavior of a cell in a coin cell configuration is not the true indication of practical battery performance, Li-metal free pouch cells of 2000 mAh and 10,000 mAh capacities were constructed to conduct the tests in the most close to practical application conditions. On the verge of several sulfur-composite materials’ development, our pouch cell revealed great promises and could deliver high-performance capabilities with the Coulombic efficiency of 100% over 100 cycles. The developed composite material is inexpensive, enables high utilization of sulfur, and is very suitable for pouch cell design.

Experimental Section


Sulfur (98%, GOST 127.1, Tengizchevroil, Kazakhstan), polyacrylonitrile (average molecular weight 150,000, J&K Scientific), ketjen black (Akzo Nobel), and natural graphite (Hohsen Corp.) were used as received without further purification.

Material Synthesis and Cell Assembly

Sulfur, PAN, and KB were mixed in a weight ratio of 4 : 1 : 1.5 wt% using ball-mill (Pulverisette 7, Fritsch Inc.) and heat-treated at 300°C for 3 h in a tubular furnace in argon to form a molecular level composite S/PAN/KB. After heat treatment, the sulfur content in the S/PAN/KB composite cathode was about 47% as revealed by CHNS analysis (Vario Micro cube, Elementar Inc.). When a composite with a higher sulfur content value was prepared, the battery did not show good performance, and as a result, the S/PAN/KB composite prepared with a weight ratio of the components 4 : 1 : 1.5 was chosen for further characterization and cell assembly (Konarov et al., 2014; Mentbayeva et al., 2016).

Cell Assembly

The cathode slurry was prepared by dispersing 80 wt% of S/PAN/KB composite, 10 wt% of acetylene black (MTI, 99.5% purity), and 10 wt% polyvinylidene fluoride (PVDF, Kynar, HSV900) in N-methyl-2-pyrrolidone (NMP) (Sigma-Aldrich, 99.5% purity). The resulting slurry was drop-cast on aluminum foil (MTI) using the doctor blade technique. Afterward, the electrode sheet was vacuum-dried at 60°C for 12 h. Coin type cells were assembled in a glovebox (MasterLab, MBraun), using lithium metal discs (250 μm) as both counter (negative) and a reference electrode, porous polypropylene membrane as a separator (Celgard® 2,400), and 1 M LiPF6 solution in ethylene carbonate/dimethyl carbonate/diethylene carbonate (EC : DMC : DEC, a volume ratio of 1 : 1 : 1, Targray) as a liquid electrolyte. The areal mass loading of the cathode was ∼2 mg cm−2 with the electrolyte to the sulfur ratio of 30 ml g−1 (Mentbayeva et al., 2016). For a full-cell preparation, graphite anode was used.

Slurry preparation for graphite anode was the same as the above-described method. Graphite (80 wt%) was mixed with 10 wt% acetylene black and 10 wt% polyvinylidene fluoride in N-methyl-2-pyrrolidone, and the resulting slurry was cast on copper foil and then vacuum-dried. In order to lithiate the graphite, coin type cells (CR2032) were assembled using Li-metal as a counter electrode. After a few cycles, the charged cell was disassembled, and lithiated graphite was taken for further use. Graphite anode preparation for pouch cells was as follows. Double side coated electrodes were prepared by roll pressing single side graphite coated electrode and casting the graphite slurry on the other side followed by vacuum drying at 60°C for 12 h and roll pressing. Each side of the graphite anode was wetted with 20 μL cm−2 electrolyte and then sandwiched between two slides of Li foil and glass plates with applying a little pressure and placing into a glass container. The lithiated graphite preparation set was left in a glove box for 12 h and used for pouch cell assembly immediately after disassembling this set.

To assemble pouch cells, the electrode sheets with the dimensions 85 × 45 mm2 for 2 Ah pouch cells and 165 × 135 mm2 for 10 Ah pouch cells were used, and hence, vacuum mixer and vacuum coater were used in this case. Mass loading of sulfur was similar to that of the coin cell (2–2.2 mg cm−2), and the mass loading of graphite was 10–12 mg cm−2 on each side of the electrode, which corresponded to an areal capacity of 3 mAh cm−2. Pouch cells were assembled in the glovebox with 12 pairs of double side coated cathode and anode and then sealed in a pouch cell case under vacuum. All lithiation and cell assembly procedures were carried in an argon-filled glovebox (MasterLab, MBraun) with O2 and H2O values less than 0.1 ppm.


Crystal structure analysis of the samples was carried out by X-ray diffraction (XRD, Rigaku SmartLab). The morphology of the materials was investigated using scanning electron microscopy (UHR FE-SEM SU9000, Hitachi Co.) with energy-dispersive spectroscopy (EDS), and the sulfur content was determined using chemical analysis (CHNS, Vario Micro cube, Elementar Inc.).

The electrochemical performance of the S/PAN/KB composite cathode was investigated using coin type (CR2032) and pouch cells. The cells were galvanostatically cycled at different current densities in a potential range of 1.0–3.0 V vs. Li/Li+ on a multichannel battery tester (BT-2000, Arbin Instruments Inc.). Specific capacity and current density were calculated based on the weight of sulfur in the electrode. Cyclic voltammetry (CV) was conducted over a potential range from 1 to 3 V vs. Li/Li+ at a scan rate of 0.1 mV s−1. All electrochemical measurements were carried out at room temperature.

Results and Discussion

As mentioned above, the S/PAN/KB composite with 47 wt% S was chosen for further characterization. The morphology of the S/PAN/KB cathode composite was studied by SEM. As can be seen in Figure 2, sulfur, nitrogen, and carbon distribution in the S/PAN/KB composite is very homogeneous, enabling electronically conductive media around low conductive sulfur. It can be seen that the composite has a particle size around 250 nm.


FIGURE 2. (A) SEM-EDS image of S/PAN/KB composite, (B) sulfur, (C) nitrogen, and (D) carbon mapping of the composite.

XRD data showed one broad peak at 2θ = 25°, which revealed that the composite is amorphous in structure. This is in agreement with other reports which show the embedding of S into PAN structure (Wang et al., 2002; Konarov et al., 2014; Mentbayeva et al., 2016; Kalybekkyzy et al., 2019).

Charge/discharge profiles and cycling performance of the half-cell coin cell are presented in Figures 3A,B, respectively. The initial discharge capacity of the cell at 0.2 C was about 1700 mAh g−1, which after an intrinsic initial irreversible capacity drop stabilized around 1,300 mAh g−1 for 100 cycles (Hara et al., 2015; Nakamura et al., 2016; Wang et al., 2018). The low potential discharge plateau at the first cycle (ΔV ∼ −0.35 V) and large initial discharge capacity is typical behavior for sulfurized polyacrylonitrile composite materials (Wang et al., 2018). After 150 cycles, the cells retained 70% of their initial discharge capacity, which demonstrates high cycle stability of the prepared composite cathode. The CV curves of the half-cell demonstrated one broad reduction peak around 1.5 V vs. Li/Li+ in the first cycle which shifts to higher potentials upon further cycling and one broad oxidation peak around 2.5 V. This is typical behavior of the S/PAN-based cathode materials (Kalybekkyzy et al., 2019).


FIGURE 3. (A) Charge/discharge profiles, (B) cyclability, and (C) cyclic voltammetry of the half-cell with S/PAN/KB cathode at 0.2 C. Coin type cells.

The half-cell exhibits a moderate rate capability, as can be seen in Figure 4. At 0.5 C (∼800 mA g−1), the discharge capacity around 1,200 mAh g−1 was observed, and when the cycling rate was returned back to a lower C rate of 0.2 C (∼300 mA g−1), the capacity was fully recovered, which means that this composite cathode can be used at different current densities.


FIGURE 4. Rate capability of half-cell containing S/PAN/KB composite assembled with Li-metal (0.2 C = 300 mA g−1 and 0.5 C = 800 mA g−1).

The full-cell exhibited and enhanced cycling performance compared to the half-cell. Figure 5A illustrates charge/discharge profiles of the S/PAN/KB cathode composite assembled in the full-cell (lithium-ion) configuration, and it presents a very similar shape and tendency with the half-cell (with lithium metal anode) counterpart. Comparing the data of Figure 3B and 5B, one can see that lithium-ion cell shows even better cycling performance than the Li-metal cell. This superior performance can be attributed to the fact that, with the lithiated graphite anode, a more stable SEI layer is formed, which relieves the capacity loss. Comparing Nyquist plots of half and full-cell, one can note that the full-cell exhibits more stable interfacial resistance than the half-cell (Supplementary Figure S1). Wu et al. (2018) have also observed similar behavior for half- and full-cell Li-S batteries with a customized ether-based electrolyte. In their work, an S-LixC full-cell was prepared, which showed a discharge capacity of 900 mAh g−1 after 400 cycles. Our full-cell in a coin cell version with a commercial carbonate-based electrolyte without any additives or modifications shows very stable performance for the initial 150 cycles (∼1,500 mAh (g-S)−1).


FIGURE 5. (A) Charge/discharge profiles and (B) cyclability of S/PAN/KB full-cell at 0.2 C.

Various groups have reported full-cell configuration such as S-Li-Si (Ye et al., 2017), Li2S-Si (Yang et al., 2010), Li2S-C (Bresser et al., 2013; Jeong et al., 2013), and Li2S-Sn (Hassoun et al., 2011) using coin cell configuration. However, a cathode preparation method with mixing and heat treatment developed in this work presents a simple and industrially scalable technique for pouch cell preparation.

Among the works reported on the fabrication of Li-S pouch cells, the best performing full-cell based on S-C cathode, Si-C anode, and LTFSI electrolyte has achieved a specific capacity of ∼500 mAh g−1 after 400 cycles (Kang et al., 2016). In addition, OXIS energy claimed to have developed ∼15 Ah/400 Wh kg−1 Li-S pouch cells (Li-metal anode and assembled with ether electrolyte) with a cycle life of 100 cycles (Fotouhi et al., 2017). Pouch cell with LiPF6 electrolyte was fabricated using S-C composite electrode material with an initial discharge capacity of 1,000 mAh g−1. However, no information about the cyclability of the cell was reported (Li et al., 2018). Here, we report the first practical pouch cell assembled in carbonate-based electrolytes with very stable performance.

Figure 6A shows the initial CV curve of a 2 Ah pouch cell at the scan rate of 0.1 mV s−1. There is one broad reduction peak at 1.2 V and one oxidation peak at 2.6 V at the first cycle, which shifted toward a higher potential at the following cycle (dashed lines). The long-chain sulfur reaction mechanism is absent or very limited in S/PAN structure, and thus lithium polysulfides are merely formed in the electrolyte (Wang et al., 2018). This makes these systems very stable upon cycling. The CV data confirm that the pouch cell reaction mechanism reproduces the tendencies and behavior of those observed for the coin cell. To investigate the stability of the pouch cell in a wider potential range, overcharge and deep discharge tests were done by CV screening of the same cell in Figure 6A between 0.1 and 4.0 V (the cycles three to five, solid lines). Data shown in Figure 6A confirm that still only one oxidation and one reduction peaks appear in this wide potential range, except during the charge stage when the current starts to rise again around 4 V. This might be related to corrosion of a current collector (Al for cathode) after 4 V. However, the CV curves are reproducible during the cycles, which confirms sufficient stability of the system even during overcharge and deep discharge operations.


FIGURE 6. CV curves at a scan rate 0.1 V s−1 within potential windows (A) 1–3 V and (B) 0.1–4 V vs. Li/Li+; (B) charge/discharge profile; and (C) cyclability of the pouch cell within cutoff potentials 1–3 V vs. Li/Li+.

Figure 6B shows the charge/discharge potential profiles of the pouch cell at 0.1 C, and the typical behavior of sulfurized polyacrylonitrile was observed in this case as well (Wang et al., 2018). In the pouch cell, we had 24 layers of electrodes, which were placed in parallel to each other. The amount of the material in a pouch cell is much larger than in a coin cell; however, the geometry of the pouch cell is more preferable for current flow as it can be seen from the impedance spectroscopy results. The semicircle is very small in the case of a pouch cell, which indicates small resistance of the system (Supplementary Figure S2). Indeed, it is not comparable with coin cell (Supplementary Figure S2, inset), since the cells are very different in their structures and sizes. It should be noted that the applied areal current to the cell is estimated to be 160 mA, which is much larger than that of the coin cell counterparts (0.5–5 mA) (Cheng et al., 2017).

The cycling performance of the pouch cell is stable, as shown in Figure 6C. It delivers a high discharge capacity of 2000 mAh in the second cycle at 0.1 C. The cell could maintain 81% of its capacity (∼1,630 mAh) after 100 cycles, as shown in Figure 6C, which is the highest reported value for Li-S full-cell assembled in the carbonate-based electrolyte. Capacity fading (or increase in the cell resistance) is attributed to the slight dissolution of S into the electrolyte. The system exhibited a high Coulombic efficiency of about 100% over 100 cycles, which could be attributed to the shuttle effect suppression in the hierarchical mesoporous and macroporous structure of the ternary composite prepared in this work.

Similar discharge characteristics could be observed for a 10 Ah pouch cell with the electrode areal dimensions of 135 × 165 mm. The cell could deliver a capacity of 10,640 mAh with a 0.1 C rate (Supplementary Figure S3). These results show the scalability of this system from the coin cell to the pouch cell configuration.

The rate capability studies of 2 Ah pouch cells have been carried out as presented in Figure 7A. It was galvanostatically charged at 0.2 C and discharged at various discharge rates up to 2 C. At 0.1 C rate, the cell exhibited an initial discharge capacity of 1950 mAh, at 0.2 C it exhibited an initial discharge capacity of 1750 mAh, and at 0.5 C, it exhibited an initial discharge capacity of 850 mAh. Although these values decreased gradually with the cycling rate, a reversible capacity of 280 mAh could be achieved even at 1 C rate, indicating a good rate performance of the system. This is attributed to a unique sulfur reaction mechanism with polyacrylonitrile. After cycling at 2 C with a delivered capacity of 50 mAh, the cell could recover its reversible capacity of about 1700 mAh when it was further cycled at 0.1 C. This is a good indicator of performance for practical pouch cells.


FIGURE 7. (A) Rate performance and (B) self-discharge of 2 Ah Li-S pouch cell.

In addition, the self-discharge behavior studies of this cell were carried out, the results of which are shown in Figure 7B. After charging to 3 V, the cell retained a potential above 2 V for 30 days, which indicates good stability and low self-discharge of only 0.7 mV day−1. In addition, overcharge, deep discharge, and short circuit tests have been carried out for the 2 Ah pouch cell (Supplementary Figure S4). During the tests, no seal leaks, fire, or explosion was detected and/or observed, but there was a swelling of the battery during overcharge (Supplementary Figure S4(a)). Therefore, it can be confirmed that our pouch cells comply with the safety requirements for lithium-ion batteries. In order to test the feasibility of the cell for potential device applications, a battery stack—a prototype of rechargeable batteries for a radio phone and drone—was assembled from 5 pouch cells of the dimensions of 85 × 45 × 6 mm3 as shown in Figure 8A. Two Ah pouch cells of the same capacity were connected in series to obtain the required stack voltage of 10 V (∼170 Wh L−1). As shown in Figure 8B, the battery prototype exhibits a stable charge/discharge profile, and an average discharge potential was around 10 V suitable for the applications mentioned.


FIGURE 8. (A) Photos of battery stack from five 2 Ah pouch cells connected in series and (B) the stack’s cyclability.


In conclusion, S/PAN/KB cathode composite was prepared by a very simple method of mixing and heat treatment. An optimized (heat treatment at 300°C for 3 h) S/PAN/KB cathode composite delivered a high capacity of 1,500 mAh/g when assembled with lithiated graphite in coin cell configuration. All cell components used for cell assembly, including carbonate electrolyte, were commercially available and were not customized or modified and are thus of a low cost. In order to show the practicality of the developed composite cathode and proposed approaches in this work, pouch cells with the cathode composite and lithiated graphite were assembled. The cell showed a stable capacity of 2000 mAh with 100% Coulombic efficiency over 100 cycles, and it has successfully passed the safety tests required for commercial batteries. This work demonstrates very feasible results for a Li-S practical full-cell and promising results toward its commercialization.

Data Availability Statement

All datasets presented in this study are included in the article/Supplementary Material.

Author Contributions

YZ, AM, IK, AK, and ZB developed the project idea. ZB supervised the work. BU, AM, AK, IK, YZ, and ZB contributed to discussion and manuscript writing. BU, AM, AK, IK, and YZ contributed to experimental work.


This work was supported by the Subproject #157-2013 funded under the Technology Commercialization Project by the World Bank and the Government of the Republic of Kazakhstan and the Targeted Program from the Ministry of Education and Science of Kazakhstan BR05236524 “Innovative materials and systems for energy conversion and storage.”

Conflict of Interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.


The authors thank Professor Izumi Taniguchi from Tokyo Institute of Technology, Japan, for assistance in conducting the SEM-EDS measurements.

Supplementary Material

The Supplementary Material for this article can be found online at:


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Keywords: lithium sulfur battery, sulfur-composite cathode materials, Li-S coin and pouch cells, rechargeable battery, lithiated electrode for Li-S battery

Citation: Uzakbaiuly B, Mentbayeva A, Konarov A, Kurmanbayeva I, Zhang Y and Bakenov Z (2020) Evaluating Sulfur-Composite Cathode Material with Lithiated Graphite Anode in Coin Cell and Pouch Cell Configuration. Front. Energy Res. 8:595481. doi: 10.3389/fenrg.2020.595481

Received: 16 August 2020; Accepted: 29 September 2020;
Published: 09 November 2020.

Edited by:

Hyo-Jun Ahn, Gyeongsang National University, South Korea

Reviewed by:

Jae-Kwang Kim, Cheongju University, South Korea
Mehmet Kadri Aydinol, Middle East Technical University, Turkey

Copyright © 2020 Uzakbaiuly, Mentbayeva, Konarov, Kurmanbayeva, Zhang and Bakenov. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Berik Uzakbaiuly,; Zhumabay Bakenov,