F掺杂可以提高锂离子电池正极材料LiMn2O4的初始容量,但使材料的循环性能变差.其原因是F的掺入降低了Mn的平均价态,Mn3+的量增加,提高了材料的初始容量,但Mn3+量的增加也加剧了Mn的溶解和Jahn-Teller畸变,使材料的循环性能变差.F掺杂虽然降低了材料的循环性能,但提高了材料的初始容量,为改善阳离子掺杂方法的不足提供了一条可能的解决途径.
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