Influence of Atmosphere on Electrochemical Performance of LiNi0.8Co0.1Mn0.1O2 Electrodes for Li-Ion Batteries

5th Annual International Conference on Material Science and Environmental Engineering

材料科学;生态环境科学

Wang, Ran^1 ; Wang, Jing^1,2,3 ; Chen, Shi^1,2,3 ; Gao, Ang^1 ; Su, Yuefeng^1,2,3 ; Wu, Feng^1,2,3

School of Materials Science and Engineering, Beijing Key Laboratory of Environmental Science and Engineering, Beijing Institute of Technology, Beijing

100081, China^1

National Development Center of High Technology Green Materials, Beijing

100081, China^2

Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing

100081, China^3

关键词: Advanced lithium-ion batteries;    Amorphous surface layers;    Charge discharge curves;    Cycling performance;    Electrochemical impedance spectra;    Electrochemical performance;    High energy densities;    Surface chemical composition;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/301/1/012039/pdf
DOI  :  10.1088/1757-899X/301/1/012039

来源: IOP

【 摘 要 】

Ni-rich layered materials have been regarded as competitive candidates for advanced lithium-ion batteries due to their high energy density, relatively low cost and environmentally-friendly nature. However, they suffer from serious degradation of cycling performance after exposing to air during their storage. Here we selected LiNi0.8Co0.1Mn0.1O2as a typical Ni-rich positive material to study the influence upon exposure to ambient air on surface chemical composition and electrochemical performance. TEM confirms the existence of amorphous surface layer after contacting with atmosphere and the thickness is about 3-4 nm. The fresh LiNi0.8Co0.1Mn0.1O2sample has capacity retention of 94.6% and 93.3% after 50 cycles at 0.2C and 1C, respectively, comparing to the 91.7% and 82.4% of the exposed sample. The charge-discharge curves and electrochemical impedance spectra indicate that exposure to air lead to increased impedance and polarization, which seriously affects LiNi0.8Co0.1Mn0.1O2cycling properties. So, it is very important for Ni-rich cathode materials without contacting with atmosphere directly.