5 years ago

Reaction Mechanisms on Solvothermal Synthesis of Nano LiFePO4 Crystals and Defect Analysis

Reaction Mechanisms on Solvothermal Synthesis of Nano LiFePO4 Crystals and Defect Analysis
Xiankun Huang, Guangyu Tian, Changyin Jiang, Yongzhong Liu, Xiangming He
A solvothermal process was used to synthesize LiFePO4 nanomaterials for lithium ion batteries. Reaction parameters such as reaction temperature and residence time were explored to obtain the optimal LiFePO4 sample. A three-stage reaction mechanism is proposed to better understand the solvothermal synthesis process. X-ray diffraction, scanning electron microscopy, and Fourier transform IR spectroscopy were used to investigate the prepared samples under different conditions. The LiFePO4 formation reaction occurred at a temperature as low as 89 °C. Defect analysis results showed that after 4 h of solvothermal treatment the concentration of lithium vacancy and Li–Fe antisite defects was too low to be detected. The charge–discharge data of the obtained LiFePO4 showed that the carbon-coated LiFePO4 samples prepared at 180 °C after 4 h of solvothermal treatment had a discharge capacity of 160.6 mA h g–1 at a discharge rate of 0.1C and 129.6 mA h g–1 at 10C.

Publisher URL: http://dx.doi.org/10.1021/acs.iecr.7b02009

DOI: 10.1021/acs.iecr.7b02009

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