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Front. Chem. | doi: 10.3389/fchem.2019.00591

Electrochemical Analysis for Enhancing Interface Layer of Spinel LiNi0.5Mn1.5O4 using p-Toluenesulfonyl Isocyanate as Electrolyte Additive

Zhe Xiao1,  Renheng Wang1, 2*, Yan Li1, Yiling Sun1, Shuting Fan1, Keyu Xiong1, Han Zhang1 and Zhengfang Qian1
  • 1College of Physics and Optoelectronic Engineering, Shenzhen University, China
  • 2Shenzhen University, China

LiNi0.5Mn1.5O4 (LNMO) is a potential cathode material for lithium-ion batteries with outstanding energy density and high voltage plateau (˃4.7 V). However, the interfacial side reaction between LNMO and the liquid electrolyte seriously causes capacity fading during cycling at the high voltage. Here, p-toluenesulfonyl isocyanate (PTSI) is used as the electrolyte additive to overcome the above problem of LNMO. The results show that the specific capacity of LNMO/Li cell with 0.5 wt.% PTSI at the first cycle is effectively enhanced 36.0 mAh/g and has better cycling performance than that without PTSI at 4.98 V. Also, a stable solid electrolyte interface (SEI) film derived from PTSI is generated on the electrode surface, which could alleviate the strike of hydrofluoric acid (HF) caused by electrolyte decomposition. These results are explained by the molecular structure of PTSI, which contains SO3. The S=O groups can delocalize the nitrogen nucleus to block the reactivity of PF5.

Keywords: Lithium ion battery, LiNi0.5Mn1.5O4, p-Toluenesulfonyl isocyanate, Solid electrolyte interface, Electrolyte additive

Received: 13 Jun 2019; Accepted: 09 Aug 2019.

Edited by:

Junchao Zheng, Central South University, China

Reviewed by:

Zhiqiang Zhu, School of Materials Science and Engineering, College of Engineering, Nanyang Technological University, Singapore
Bin Huang, Guilin University of Technology, China
Zhenjiang He, Central South University, China  

Copyright: © 2019 Xiao, Wang, Li, Sun, Fan, Xiong, Zhang and Qian. 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: Dr. Renheng Wang, Shenzhen University, Shenzhen, China, wangrh@szu.edu.cn