期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 11, 页码 9614-9619出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b15628
关键词
AlF3; atomic layer deposition; freestanding; high energy density; excellent flexibility
资金
- Natural Science Foundation of China [21301199]
- Natural Science Foundation of Chongqing Municipality [cstc2014jcy-jA50035]
- Chongqing Municipal Education Commission [KJ130601]
- Recruitment Program of Global Experts by Wuhan East Lake Hi-Tech Development Zone, China [3551]
- Defense Advanced Research Project Agency (DARPA)
Freestanding LiCoO2/multiwall carbon nanotube/nanocellulose fibril (LCO-MWCNT-NCF) electrodes are fabricated by a vacuum filtration technique. The electrode has a high LCO loading of 20 mg/cm(2) with excellent flexibility; uniform material distribution, and low surface resistivity. When coated with 2 ALD cycles of AlF3, LCO-MWCNT-NCF has a high specific capacity of 216 mAh/g at 4.7 V. The freestanding AlF3-coated electrode preserves 75.7% of its initial capacity after 100 cycles and 70% after 160 cycles of charge discharge. In contrast, electrodes coated with 2 ALD cycles of Al2O3 cannot be cycled above 4.5 V. By elimination of the unnecessary weight of current collector, and increasing in the working voltage simultaneously, this freestanding LCO-MWCNT-NCF electrode can significantly improve the gravimetric and volumetric energy density of lithium ion batteries.
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