Influence of Crystallinity of Lithium Thiophosphate Solid Electrolytes on the Performance of Solid-State Batteries

Shuo Wang, Wenbo Zhang, Xiang Chen, Dyuman Das, Raffael Ruess, Ajay Gautam, Felix Walther, Saneyuki Ohno, Raimund Koerver, Qiang Zhang, Wolfgang G. Zeier, Felix H. Richter, Ce Wen Nan, Jürgen Janek

研究成果: Contribution to journalArticle査読

2 被引用数 (Scopus)

抄録

Solid electrolytes (SEs) largely define the properties of all-solid-state batteries (ASSBs) and are expected to improve their safety, stability, and performance. Their ionic conductivity has much improved in recent years, enabling higher power and energy density. However, more subtle parameters, such as crystallinity, may also influence the electrochemical performance of cells. In this work, the correlation between the performance of ASSBs and thiophosphate SEs having the same stoichiometry, but different crystallinity is investigated. In In/InLi | SE | LiCoO2@ LiNb0.5Ta0.5O3 model cells, better cycling and rate performance is achieved when using glass/glass-ceramic SEs (e.g., 75Li2S·25P2S5 glass, 70Li2S·30P2S5 glass, and Li6PS5Cl glass-ceramic). This can be mostly attributed to the mitigation of contact loss by the glass/glass-ceramic SEs compared to their crystalline SE counterparts. Furthermore, the SE decomposition at typical cathode potentials is investigated by using SE and carbon composites as cathodes. Larger volume changes and more severe decomposition are observed with crystalline SEs in the SE/carbon composite cathode after cycling. The crystalline SEs show higher electronic partial conductivity which results in more degradation in the composite cathode. This work sheds light on optimized composite cathode design for ASSB by carefully choosing solid electrolytes with appropriate mechanical and (electro-)chemical properties.

本文言語英語
論文番号2100654
ジャーナルAdvanced Energy Materials
11
24
DOI
出版ステータス出版済み - 6 24 2021

All Science Journal Classification (ASJC) codes

  • 再生可能エネルギー、持続可能性、環境
  • 材料科学(全般)

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