【作者】 沈鹏； 张彩艳； 陈骏； 叶尚云； 刘世香； 于然波； 刘桂荣； 邢献然；

【Author】 Shen Peng, Zhang Caiyuan, Chen Jun, Ye Shangyun, Liu Shixiang, Yu Ranbo, Liu Guirong , Xing Xianran (Department of Physical Chemistry, University of Science & Technology Beijing, Beijing 100083, China)

【机构】 北京科技大学理化系；

【摘要】 用固相法合成了纯相LiFePO4粉体及碱土金属M1位掺杂产物(Li,M)FePO4(M=Mg,Sr,Ba);对产物进行了XRD分析和首次循环充放电容量分析,发现掺杂的金属离子半径越大,掺杂量越多,产物的首次循环充放电容量越低;认为金属离子掺杂进入M1 位后对Li+的脱出有束缚作用,掺杂离子半径的增大及掺杂量的增加将提高此束缚作用,从而降低电容量。更多还原

【Abstract】 A pure LiFePO4 powder and its doped products (Li, M) FePO4(M=Mg, Sr, Ba)at M1 site by the alkaline earth metal were synthesized with a solid state method. XRD measurements were used to identify the phases and the first cycle capacity test were taken. It is found that either the radium or the amount of the doped metal M increases, the electric capacity of the powder at the first circle decreases. This might ascribe that the dopant in the Ml site will astrict the moving of the Li+, and this effect will be reinforced when the radium or amount of the dopant increases, and then result in the capacity decreases.更多还原