About this Research Topic
Lithium-sulfur (Li-S), lithium-selenide (Li-Se) and lithium-oxygen (Li-O2 ) batteries have been long deemed as promising candidates for next-generation energy storage systems, owing to their high theoretical energy density and low cost. However, both lithium chalcogenide batteries are still challenged by several challenges that hinder their practical application. Over the past decade, significant improvements in Li-S batteries and Li-Se batteries have been halted by the sluggish reaction kinetics. The incomplete transformation and unsatisfactory electrocatalytic activity of chalcogenide redox promoter leads to low material utilization and poor reversibility, resulting in low discharge capacity, undesired rate capability and cycle stability. Similarly, in the field of Li-O2 , the sluggish OER reaction has plagued the field with extremely high charge overpotentials and corresponding electrolyte degradation. The use of an electrocatalyst in Li-O2 has been a much-debated topic with many researchers unclear as to its exact mechanism and role.
The practical application of Li-S, Li-Se, Li-Se/S and Li-O2 batteries are still hindered by numerous challenges, especially on their sluggish redox reaction kinetics. To solve these problems, numerous efforts have been pursued to accelerate electrocatalytic behavior, including sulfur host design, separator modification, interlayer configuration, air cathode-catalyst design, and redox mediators. Of the various strategies, designing high activity catalysts to serve as active sites for fast lithium polychalcogenide (LiPC) conversion reaction is the key role in achieving fast and durable Li-S and Li-Se performances. Similarly, the use of electrocatalysts will reduce the prohibitively high charge potentials during the oxygen evolution reaction of Li-O2 . Moreover, understanding of the electrocatalyst on both OER in Li-O2 and the formation of Li2 S and Li2 Se will clarify future directions.
This Research Topic on electrocatalysis of lithium chalcogenide batteries is expected to provide a forum for battery research communities to discuss the catalyst design in lithium chalcogenide batteries. For this Research Topic, Original Research papers, Reviews, and short communications are welcomed on the following topics:
• Advanced cathode, separator and interlayer for accelerated kinetics of lithium chalcogenide batteries.
• Fundamental understanding of the catalytic effects in lithium chalcogenide batteries.
• Theoretical simulation of the chalcogenide electrodes and catalysts.
• Optimized cell design for high loading, efficient catalysis, and a minimum amount of electrolyte.
• Electrocatalyst with high catalytic activity and long durability.
Keywords: electrocatalyst, conversion reaction, redox reaction kinetics, chalcogenide, lithium-sulfur batteries
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