Improvement of electrochemical and thermal stability of LiFePO4@C batteries by depositing amorphous silicon film

作者：Lin, Yingbin^*; Yang, Yanmin; Lin, Ying; Zeng, Baozhi; Zhao, Guiying; Huang, Zhigao

来源：Electrochimica Acta, 2011, 56(14): 4937-4941.

DOI：10.1016/j.electacta.2011.03.134

• Lithium-ion batteries
• Cathode materials
• Phosphor-olivine
• Amorphous silicon

Amorphous silicon (a-Si) films are deposited on LiFePO4@C electrode by using vacuum thermal evaporation deposition technique and the effect of alpha-Si film on electrochemical performance of LiFePO4@C cells is investigated systematically by the charge-discharge testing, cyclic voltammograms and AC impedance spectroscopy, respectively. The results reveal that the present of a-Si film on electrode surface could remarkably improve the electrochemical performance at high charge/discharge rate, especially at elevated temperature. This enhancement may be attributed to the amelioration of the electrochemical dynamics on the electrode/electrolyte interface resulting from the beneficial effects of a-Si film, which might significantly suppress the rise of both of the surface film resistance and charge transfer resistance.

• 出版日期2011-5-30
• 单位福建师范大学