nz0c00256_si_001.pdf (2.59 MB)
Eliminating the Detrimental Effects of Conductive Agents in Sulfide-Based Solid-State Batteries
journal contribution
posted on 2020-03-23, 16:06 authored by Sixu Deng, Yipeng Sun, Xia Li, Zhouhong Ren, Jianwen Liang, Kieran Doyle-Davis, Jianneng Liang, Weihan Li, Mohammad Norouzi Banis, Qian Sun, Ruying Li, Yongfeng Hu, Huan Huang, Li Zhang, Shigang Lu, Jun Luo, Xueliang SunSulfide-based
solid-state electrolytes (SSEs) are considered a
key part in the realization of high-performance all solid-state lithium-ion
batteries (ASSLIBs). However, the incompatibility between conductive
additives and sulfide-based SSEs in the cathode composite challenges
the stable delivery of high-rate capability. Herein, a poly(3,4-ethylenedioxythiophene)
(PEDOT) modification is designed as a semiconductive additive for
cathode composites (cathode/SSE/carbon) to realize the high performance.
The modified ASSLIB demonstrates a competitive rate capacity of over
100 mAh g–1 at 1C, which is 10
times greater than that of the bare cathode. Detailed surface chemical
and structural evolutions at the cathodic interface indicate the PEDOT
modification not only significantly suppresses the side reactions
but also realizes effective electron transfer at the cathode/SSE/carbon
three-phase interface. Introducing a controllable semiconductive additive
for the cathode composites in this study offers a promising design
to realize the high-rate performance and overcome long-term challenges
in the application of conductive additives in sulfide-based ASSLIBs.