导电剂对锂硫电池正极性能的影响

Effect of Conductive Agent on the Performance of Lithium-Sulfur Battery Cathode

摘要: 锂硫电池具有极高的理论能量密度有望成为下一代二次电池体系。但仍存在活性物质利用率低，循环稳定性差等缺点，导致其无法实现商业化。近年来，通过对硫宿主材料的设计与合成，改性隔膜和锂负极等策略，锂硫电池的性能得到显著的提升。导电剂作为锂硫电池正极中重要组成部分，相关研究与进展较少。本文对比了在正极中使用乙炔黑与Super P作为导电剂锂硫电池的充放电比容量，库伦效率和循环稳定性，揭示了导电剂的性质对电池性能的重要影响，同时也对导电添加剂的使用与设计提供一定的指导。

Abstract: Lithium-sulfur batteries with very high theoretical energy density are expected to be the next generation of secondary battery system. However, there are still drawbacks such as low active material utilization and poor cycling stability, which prevent them from commercialization. In recent years, the performance of lithium-sulfur batteries has been significantly improved through the design and synthesis of sulfur host materials, modified diaphragms and lithium anodes, and other strategies. The conductive agent, an important component in the cathodes of lithium-sulfur batteries, has seen less relevant research and progress. This paper compares the charge/discharge specific capacity, Coulomb efficiency and cycling stability of lithium-sulfur batteries using acetylene black and Super P as conductive agents in the cathode, revealing the important influence of the nature of conductive agents on the battery performance, and also providing some guidance on the use and design of conductive additives.