Citation: YAN Shi-Jian, GAO Liang, ZHANG Min-Gang, ZHENG Jian-Jun, LIU Jian-Sheng. Soft Chemistry Synthesis and Lithium Fast Ionic Conductor Modification for LiFePO₄ Cathode Material of Li-Ion Battery[J]. Chinese Journal of Inorganic Chemistry, ;2018, 34(7): 1319-1326. doi: 10.11862/CJIC.2018.160 shu

Soft Chemistry Synthesis and Lithium Fast Ionic Conductor Modification for LiFePO₄ Cathode Material of Li-Ion Battery

Institute of Advanced Materials, School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China

Corresponding author: ZHANG Min-Gang, am_lab@yeah.net
Received Date: 7 February 2018
Revised Date: 4 May 2018

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Soft chemistry synthesis and electrochemical properties via Li_0.5La_0.5TiO₃ (LLTO) fast ionic conductor modification for LiFePO₄ cathode material of Li-ion battery were investigated. LiFePO₄ was synthesized via solvothermal method, LLTO powder was synthesized via sol-gel method, LiFePO₄ was modified by LLTO with the proportion of 1%~4%(w/w) via alcohol suspension mixing method, and the composite cathode materials of thin-wall cellular characteristic self-assembly LiFePO₄ modified by spherical LLTO nano-particles were acquired. The effects of LLTO modified proportion on charge and discharge specific capacity, cycle performance and reversibility were studied by charge/discharge test, AC impedance test and cyclic voltammetry test. The results indicate when LLTO modified proportion is 3% (w/w), the discharge specific capacity increases by 29.7% in the current rate of 2C and increases by 31.6% in the current rate of 5C, the capacity loss rate after 30 charge/discharge cycles decreases by 4.13% compared to unmodified condition, and the potential difference between redox peaks in cyclic voltammetry curve is only 0.117 V. LiFePO₄ modified by LLTO with proportion of 3% significantly improves the current rate capability and cycle performance of Li-ion battery, and also improves the low temperature performance.
- Li-ion battery,
- LiFePO₄,
- Li_0.5La_0.5TiO₃,
- modification
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