Sputtering Coating of Lithium Fluoride Film on Lithium Cobalt Oxide Electrodes for Reducing the Polarization of Lithium-Ion Batteries
Shasha Qu,
Wenbin Wu,
Yunfan Wu,
Yanping Zhuang,
Jie Lin,
Laisen Wang,
Qiulong Wei,
Qingshui Xie,
Dong-Liang Peng
Affiliations
Shasha Qu
College of Materials, State Key Laboratory for Physical Chemistry of Solid Surfaces, Fujian Key Laboratory of Materials Genome, and Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen 361005, China
Wenbin Wu
College of Materials, State Key Laboratory for Physical Chemistry of Solid Surfaces, Fujian Key Laboratory of Materials Genome, and Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen 361005, China
Yunfan Wu
College of Materials, State Key Laboratory for Physical Chemistry of Solid Surfaces, Fujian Key Laboratory of Materials Genome, and Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen 361005, China
Yanping Zhuang
College of Materials, State Key Laboratory for Physical Chemistry of Solid Surfaces, Fujian Key Laboratory of Materials Genome, and Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen 361005, China
Jie Lin
College of Materials, State Key Laboratory for Physical Chemistry of Solid Surfaces, Fujian Key Laboratory of Materials Genome, and Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen 361005, China
Laisen Wang
College of Materials, State Key Laboratory for Physical Chemistry of Solid Surfaces, Fujian Key Laboratory of Materials Genome, and Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen 361005, China
Qiulong Wei
College of Materials, State Key Laboratory for Physical Chemistry of Solid Surfaces, Fujian Key Laboratory of Materials Genome, and Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen 361005, China
Qingshui Xie
College of Materials, State Key Laboratory for Physical Chemistry of Solid Surfaces, Fujian Key Laboratory of Materials Genome, and Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen 361005, China
Dong-Liang Peng
College of Materials, State Key Laboratory for Physical Chemistry of Solid Surfaces, Fujian Key Laboratory of Materials Genome, and Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen 361005, China
Lithium cobalt oxide (LCO) is the most widely used cathode materials in electronic devices due to the high working potential and dense tap density, but the performance is limited by the unstable interfaces at high potential. Herein, LiF thin film is sputtered on the surface of LCO electrodes for enhancing the electrochemical performance and reducing the voltage polarization. The polarization components are discussed and quantified by analyzing the relationship between electrochemical polarization and charger transfer resistance, as well as that between concentration polarization and Li-ion diffusion coefficients. In addition, the decreased charge transfer resistance, increased lithium-ion diffusion coefficients, and stabilized crystal structure of LiF-coated LCO are confirmed by various electrochemical tests and in-situ XRD experiments. Compared to that of pristine LCO, the capacity and cycling performance of LiF-coated LCO is improved, and the overpotential is reduced upon cycling. This work provides reference for quantifying the various polarization components, and the strategy of coating LiF film could be applied in developing other analogous cathode materials.
