锂离子电池正极材料LiFePO4的电化学性能改进

引言 随着社会的进步,人们对化学电源提出了高能量、长寿命、低成本、低环境污染的要求.虽然锂离子蓄电池目前已经实现了商品化,但正极嵌锂材料结构与性能的研究,以及如何提高容量和降低成本是锂离子蓄电池进一步被开发和应用的关键.

Improvement of electrochemical performance of LiFePO4 cathode materials for lithium-ion battery

LiFePO₄ and carbon-doped LiFePO₄ were prepared by a novel solid-phase synthesis.The samples were characterized by X-ray diffraction,SEM,elemental analysis and electrochemical performances.These test results showed that the reaction conditions favored stabilization of samples as well as offered some control of the product morphology.Carbon-doped LiFePO₄ retained olivine structure and had good electrochemical performance.The results of electrochemical evaluation of the doped product showed a lithium insertion plateau around 3.5 V(vs.Li/Li⁺) together with the initial charge specific capacity of 159.9 mAh•g^-1 at 0.1C rate and with little specific capacity decay after 20 cycle at room temperature.