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Lithium Hexamethyldisilazide Endows Li||NCM811 Battery with Superior Performance
Junda Huang1,2, Yaxiong Yang3, Yanxia Liu4
1School of Chemistry, Tiangong University, Tianjin, 300387, People's Republic of China.
Nano-Micro Letters
|January 9, 2023
Summary
Researchers developed a stable cathode electrolyte interphase (CEI) using lithium hexamethyldisilazide (LiHMDS) additive. This method enhances NCM811 battery performance, extending cycle life significantly at various temperatures.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Stable cathode electrolyte interphase (CEI) is crucial for NCM811 cathode stability.
- Electrolyte engineering is key to improving battery performance and longevity.
Purpose of the Study:
- To develop a stable CEI on NCM811 cathode surfaces.
- To enhance the cycling performance and structural integrity of NCM811 batteries.
Main Methods:
- Utilized lithium hexamethyldisilazide (LiHMDS) as an electrolyte additive.
- Investigated the formation of CEI and its effect on electrolyte components (H2O, HF).
Main Results:
- LiHMDS facilitated the generation of a stable CEI on the NCM811 cathode.
- The additive effectively eliminated water (H2O) and hydrogen fluoride (HF) from the electrolyte.
- Achieved significant improvements in cycling performance, reaching 1000 cycles at 25°C and 500 cycles at 60°C with a 4.5V cut-off voltage.
Conclusions:
- LiHMDS is an effective electrolyte additive for creating stable CEI layers.
- This approach significantly boosts the electrochemical performance and stability of NCM811-based lithium batteries.
