期刊
NANO LETTERS
卷 -, 期 -, 页码 -出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.2c01002
关键词
Polyacrylonitrile; Nickel-rich layered oxide; Thermochemical cyclization; Dual-coating; Li-ion battery
类别
资金
- International Science & Technology Cooperation Program of China [2019YFE0100200]
- National Natural Science Foundation of China [22075026]
- Teli Fellowship of Beijing Institute of Technology
This study proposes a thermochemical cyclization strategy to enhance the microstructural and electrochemical stabilities of Ni-rich layered oxides. The cathode design based on this strategy significantly improves the cycling performance and rate capability of LiNi0.8Co0.1Mn0.1O2, making it potentially viable for commercialization in high-energy Li-ion batteries.
Enhancing microstructural and electrochemical stabilities of Ni-rich layered oxides is critical for improving the safety and cycle-life of high-energy Li-ion batteries. Here we propose a thermochemical cyclization strategy where heating polyacrylonitrile with LiNi0.8Co0.1Mn0.1O2 can simultaneously construct a cyclized polyacrylonitrile outer layer and a rock-salt bridge-like inner layer, forming a compact dual-coating of LiNi0.8Co0.1Mn0.1O2. Systematic studies demonstrate that the mild cyclization reaction between polyacrylonitrile and LiNi0.8Co0.1Mn0.1O2 induces a desirable layered to rock-salt structural transformation to create a nano-intermedium that acts as the bridge for binding cyclized polyacrylonitrile to layered LiNi0.8Co0.1Mn0.1O2. Because of the improvement of the structural and electrochemical stability and electrical properties, this cathode design remarkably enhances the cycling performance and rate capability of LiNi0.8Co0.1Mn0.1O2, showing a high reversible capacity of 183 mAh g-1 and a high capacity retention of 83% after 300 cycles at 1 C rate. Notably, this facile and scalable surface engineering makes Ni-rich cathodes potentially viable for commercialization in high-energy Li-ion batteries.
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