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Constructing a High-Energy and Durable Single-Crystal NCM811 Cathode for All-Solid-State Batteries by a Surface
Xiangsi Liu1, Jingwen Shi1, Bizhu Zheng1
1State Key Laboratory for Physical Chemistry of Solid Surfaces, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People's Republic of China.
ACS Applied Materials & Interfaces
|August 25, 2021
Summary
A nano-lithium niobium oxide (LNO) coating stabilizes the interface of single-crystal LiNi0.8Co0.1Mn0.1O2 (S-NCM811) cathodes in all-solid-state batteries (ASSBs). This enhances capacity and rate capability by suppressing side reactions.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Single-crystal LiNi0.8Co0.1Mn0.1O2 (S-NCM811) exhibits superior electrochemical performance in all-solid-state batteries (ASSBs) due to its compliant microstructure.
- Undesired side reactions at the cathode/solid-state electrolyte (SSE) interface limit the practical application of S-NCM811 in ASSBs, resulting in lower capacity and rate capability compared to lithium-ion batteries.
Purpose of the Study:
- To enhance the electrochemical performance of S-NCM811 in ASSBs by addressing interface instability.
- To investigate the efficacy of a nano-lithium niobium oxide (LNO) coating and post-annealing treatment in stabilizing the cathode/SSE interface.
Main Methods:
- Coating of a nano-lithium niobium oxide (LNO) layer onto S-NCM811 using atomic layer deposition.
- Optimization of post-annealing treatment for the LNO layer at 400 °C.
- Electrochemical characterization of ASSBs utilizing the modified S-NCM811 cathode.
Main Results:
- The LNO-coated S-NCM811 cathode delivered a high capacity of 205 mAh g-1 at 0.1C and maintained excellent rate capability (175 mAh g-1 at 0.3C, 116 mAh g-1 at 1C).
- The nano-LNO layer effectively suppressed sulfide SSE decomposition and stabilized the cathode/SSE interface.
- Post-annealing improved LNO coating uniformity, removed residual lithium salts, and minimized impedance increase and electrochemical polarization during cycling.
Conclusions:
- The post-annealed nano-LNO layer is critical for improving the performance of high-nickel cathodes in ASSBs.
- This work provides insights into designing high-performance cathode materials for ASSBs by stabilizing the cathode/SSE interface.
