Premium
Deciphering Interfacial Chemical and Electrochemical Reactions of Sulfide‐Based All‐Solid‐State Batteries
Author(s) -
Wang Changhong,
Hwang Sooyeon,
Jiang Ming,
Liang Jianwen,
Sun Yipeng,
Adair Keegan,
Zheng Matthew,
Mukherjee Sankha,
Li Xiaona,
Li Ruying,
Huang Huan,
Zhao Shangqian,
Zhang Li,
Lu Shigang,
Wang Jiantao,
Singh Chandra Veer,
Su Dong,
Sun Xueliang
Publication year - 2021
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202100210
Subject(s) - materials science , oxide , electrochemistry , electrolyte , cathode , oxygen , sulfide , chemical engineering , lithium (medication) , oxygen evolution , coating , nanotechnology , electrode , organic chemistry , chemistry , metallurgy , engineering , medicine , endocrinology
Large interfacial resistance resulting from interfacial reactions is widely acknowledged as one of the main challenges in sulfide electrolytes (SEs)‐based all‐solid‐state lithium batteries (ASSLBs). However, the root cause of the large interfacial resistance between the SEs and typical layered oxide cathodes is not fully understood yet. Here, it is shown that interfacial oxygen loss from single‐crystal LiNi 0.5 Mn 0.3 Co 0.2 O 2 (SC‐NMC532) chemically oxidizes Li 10 GeP 2 S 12 , generating oxygen‐containing interfacial species. Meanwhile, the interfacial oxygen loss also induces a structural change of oxide cathodes (layered‐to‐rock salt). In addition, the high operation voltage can electrochemically oxidize SEs to form non‐oxygen species (e.g., polysulfides). These chemically and electrochemically oxidized species, together with the interfacial structural change, are responsible for the large interfacial resistance at the cathode interface. More importantly, the widely adopted interfacial coating strategy is effective in suppressing chemically oxidized oxygen‐containing species and mitigating the coincident interfacial structural change but is unable to prevent electrochemically induced non‐oxygen species. These findings provide a deeper insight into the large interfacial resistance between the typical SE and layered oxide cathodes, which may be of assistance for the rational interface design of SE‐based ASSLBs in the future.