title: Coating Solution for High-Voltage Cathode: AlF3Atomic Layer Deposition for Freestanding LiCoO2Electrodes with High Energy Density and Excellent Flexibility.
abstract: 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/cm2with 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 Al2O3cannot 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.
authors.affiliation: College of Chemistry, Chongqing Normal University , Chongqing 401311, China.
authors.forename: Yun
authors.identifier: http://orcid.org/0000-0003-3926-9405
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: Department of Chemistry and Biochemistry, University of Colorado at Boulder , Boulder, Colorado 80309, United States.
authors.forename: Younghee
authors.initials: Y
authors.lastname: Lee
authors.affiliation: Department of Chemistry and Biochemistry, University of Colorado at Boulder , Boulder, Colorado 80309, United States.
authors.forename: Huaxing
authors.identifier: http://orcid.org/0000-0002-8638-4492
authors.initials: H
authors.lastname: Sun
authors.affiliation: Department of Chemistry and Biochemistry, University of Colorado at Boulder , Boulder, Colorado 80309, United States.
authors.forename: Jasmine M
authors.initials: JM
authors.lastname: Wallas
authors.affiliation: Department of Chemistry and Biochemistry, University of Colorado at Boulder , Boulder, Colorado 80309, United States.
authors.forename: Steven M
authors.identifier: http://orcid.org/0000-0003-0253-9184
authors.initials: SM
authors.lastname: George
authors.affiliation: Department of Chemistry and Biochemistry, University of Colorado at Boulder , Boulder, Colorado 80309, United States.|BattFlex Technologies, Inc. , Wuhan 430079, China.
authors.forename: Ming
authors.initials: M
authors.lastname: Xie
keywords: AlF3; atomic layer deposition; excellent flexibility; freestanding; high energy density