We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Surface‐to‐Bulk Synergistic Modification of Single Crystal Cathode Enables Stable Cycling of Sulfide‐Based All‐Solid‐State Batteries at 4.4 V.
- Authors
Sun, Nan; Song, Yajie; Liu, Qingsong; Zhao, Wei; Zhang, Fang; Ren, Liping; Chen, Ming; Zhou, Zinan; Xu, Zihan; Lou, Shuaifeng; Kong, Fanpeng; Wang, Jian; Tong, Yujin; Wang, Jiajun
- Abstract
The interfacial stability between sulfide solid‐state electrolytes (SSEs) and high voltage Ni‐rich oxide cathodes is critical to the electrochemical performances of all‐solid‐state batteries (ASSBs), yet it is challenging to solve the interface issues by surface coating modification. Here, a surface‐to‐bulk synergistic modification is proposed to achieve a highly stable interface through the combination of TiNb2O7‐coated and Ti‐doped LiNi0.6Mn0.2Co0.2O2 single crystals (DC‐TNO@SCNCM). The TiNb2O7 coating layer with thermodynamic/electrochemical stability and electronic insulation avoids the decomposition of SSEs. The strong TiO bond in SCNCM achieved by Ti doping can stabilize lattice oxygen and avoid further electrochemically oxidizing sulfide electrolytes to form oxygenated sulfurous and phosphorous species. The modified DC‐TNO@SCNCM cathode exhibits excellent long‐cycle stability with a capacity retention rate of 92.2% after 140 cycles at a high cut‐off voltage of 4.4 V. This surface‐to‐bulk synergistic modification strategy provides a new perspective for the design of high‐voltage sulfide‐based ASSBs.
- Subjects
SINGLE crystals; SOLID electrolytes; CATHODES; HIGH voltages; SURFACE coatings
- Publication
Advanced Energy Materials, 2022, Vol 12, Issue 29, p1
- ISSN
1614-6832
- Publication type
Article
- DOI
10.1002/aenm.202200682