Ti^(4+)掺杂改善锂离子电池正极材料LiFePO_4的电化学性能研究

Study of Electrochemical Property of LiFePO_4 Anode Material of Ti^(4+) doped Modified Lithium-ion Battery

采用固相法掺杂钛合成了Li1-yTiyFePO4,研究了原料钛的掺杂量、焙烧温度和焙烧时间对锂离子电池正极材料Li1-yTiyFePO4电化学性能的影响。通过正交实验[L9(33)]确定合成橄榄石型Li1-yTiyFePO4的最佳工艺为:掺杂Ti4+量为1%(摩尔分数),焙烧温度为700℃,焙烧时间为16 h。经实验验证,优化后的合成工艺有利于提高锂离子电池正极材料的电化学性能。

Lil-yTiy FePO4 is synthesized by Ti doping with solid-phase processs, tudy is made of the effect of doped Ti content, roasting temperature and duration, as well as the electrochemical properties of lithium ion battery. The following optimum technological parameters were confirmed through Latin orthogonal experi- ment [L9 （3^3）] ： doped Ti^4＋ content 1% （x）, the roasting temperature 700 ℃, roasting duration 16 h. The test results proves that the optimized synthesis technology is good for improvement of electrochemical property of lithium ion battery anode material.