【摘要】 橄榄石型LiFePO4是近年发展起来的一种锂离子电池正极材料,它的理论容量为170mAh/g。具有价格便宜、环境友好、无毒、无吸湿性、热稳定性好等优点,越来越受到人们的重视。但是由于LiFePO4的室温电导率低,影响了它的实际应用,为改善其电导率低的问题,本文采用固相法掺杂稀土元素Y合成Li0.99Y0.01FePO4,结果表明,掺杂后材料具有良好的电化学性能,其室温初始放电容量为129.9mAh/g,循环15次后几乎没有衰减。更多还原

【Abstract】 Olivine LiFePO₄ was a new kind of cathode material for lithium-ion battery. This material was cheap and environmentally benign. It has a relatively large theoretical capacity of 170mAh/g. compared with other iron-based compound, it has no toxicity, good thermal stability in full charged state and little hygroscopicity. So it has attracted particular interest. But LiFePO₄ has poor conductivity at room temperature, which baffle its application. In this paper, in order to improve the conductivity, Li_0.99Y_0.01FePO₄ was prepared by solid-state reaction. The result showed that Li_0.99Y_0.01FePO₄ had good electrochemical performance whose initial capacity was 129.9mAh/g and had very little capacity fading after 15 circles at room temperature.更多还原