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Published on: November 11, 2013
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Ultrahigh-Nickel Cathodes with B/Al Codoped Gradient Interface for High-Energy All-Solid-State Lithium Batteries.
Xiangqun Xu1,2, Sheng Xu1,2, Shuqi Kang1,2
1College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, National Laboratory of Solid-State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
Journal of the American Chemical Society
|March 11, 2026
Summary
Engineered surface layers on ultrahigh-nickel cathodes improve all-solid-state battery performance. This novel strategy enhances stability and cycle life for next-generation batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Ultrahigh-nickel layered oxide cathodes (NCM, Ni≥0.9) are crucial for high energy density in all-solid-state batteries (ASSBs).
- Interfacial instability, including electrolyte decomposition and structural degradation, hinders the performance of these advanced cathodes.
Purpose of the Study:
- To develop a surface engineering strategy for single-crystal LiNi0.92Co0.06Mn0.02O2 (SNCM) cathodes.
- To mitigate interfacial side reactions and structural degradation in ASSBs.
Main Methods:
- Synergistic codoping with boron (B) and aluminum (Al) to create a gradient cation-disordered layer on SNCM.
- Characterization of the protective layer's effect on interfacial chemistry and structural stability.
Main Results:
- The B-induced disordered layer suppressed side reactions between the cathode and solid-state electrolyte (SSE).
- Al dopants enhanced Li+ kinetics and stabilized lattice oxygen, further preventing degradation.
- Modified SNCM cathodes exhibited high initial discharge capacity (236.0 mAh/g) and excellent capacity retention (86% after 200 cycles at 60°C; 94% after 500 cycles at 5C/RT).
Conclusions:
- A novel gradient cation-disordered layer effectively protects ultrahigh-nickel cathodes.
- This surface engineering approach significantly enhances the stability and cycle life of cathodes for practical ASSBs.
