Citation: Qingtang ZHANG, Xiaoyu WU, Zheng WANG, Xiaomei WANG. Performance of nano Li₂FeSiO₄/C cathode material co-doped by potassium and chlorine ions[J]. Chinese Journal of Inorganic Chemistry, ;2024, 40(9): 1689-1696. doi: 10.11862/CJIC.20240115 shu

Performance of nano Li₂FeSiO₄/C cathode material co-doped by potassium and chlorine ions

1.
School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China
2.
School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China

Corresponding author: Qingtang ZHANG, zhqt137@163.com Xiaomei WANG, wxmei06@163.com
Received Date: 30 April 2024
Revised Date: 25 July 2024

Figures(7)

Herein, the structure and electrochemical properties of nano Li₂FeSiO₄/C cathode materials were optimized through co-doping potassium and chlorine ions. A series of nano Li_2-xKxFeSiO_4-0.5xCl_x/C (x=0, 0.01, 0.02) composites were prepared by a solid-state reaction. The microstructure and electrochemical performance of the three kinds of composites were analyzed using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, constant current charge-discharge test, etc. The results showed that nano Li_1.99K_0.01FeSiO_3.995Cl_0.01/C cathode material owned the largest interplanar spacing, biggest cell volume, and smallest average particle size among the three materials. The average particle size of nano Li_1.99K_0.01FeSiO_3.995Cl_0.01/C cathode material was as small as 32 nm. These particular structures made it exhibit the best electrochemical performance. The initial specific discharge capacity of the nano Li_1.99K_0.01FeSiO_3.995Cl_0.01/C cathode material at 0.1C was as high as 203 mAh·g^-1. In addition, a capacity retention rate of 97.72% was acquired for the nano Li_1.99K_0.01FeSiO_3.995Cl_0.01/C cathode material at 1C after 100 charge-discharge cycles.
- lithium-ion battery,
- cathode material,
- lithium ferrosilicate,
- co-doping
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沈阳化工大学材料科学与工程学院沈阳 110142

Performance of nano Li2FeSiO4/C cathode material co-doped by potassium and chlorine ions

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Performance of nano Li₂FeSiO₄/C cathode material co-doped by potassium and chlorine ions