Mn掺杂Li3Fe2(PO4)3正极材料的制备与表征

功能材料, 2009, 40(4): 604-610.

Mn掺杂Li3Fe2(PO4)3正极材料的制备与表征

宋翠环 ^1, , 孙军康 ^2, , 黄富强 ^3, , 刘战强 ^4, , 何品刚 ^5,

1.华东师范大学理工学院化学系,上海,200062;中国科学院上海硅酸盐研究所,上海,200050

2.中国科学院上海硅酸盐研究所,上海,200050

3.中国科学院上海硅酸盐研究所,上海,200050

4.中国科学院上海硅酸盐研究所,上海,200050

5.华东师范大学理工学院化学系,上海,200062

基金项目: 国家重点基础研究发展规划(973计划)(2007CB936704) 国家自然科学基金(50772123)

关键词：锂离子电池正极材料 , Li3Fe2(PO4)3 , Mn掺杂 , 循环伏安法

Synthesis and performance of Mn-doped Li3Fe2(PO4)3 materials

通过固相反应法合成出Li3+xFe2-xMnxn(Po4)3(x-0～O.1)、Li3Fel.ω5Mn0.05(PO4)3和Li2.95Fe1.ωMnoN.05(PO4)3正极材料.采用行星式球磨方法,均匀混合正极材料和导电乙炔黑以提高活性材料的电子导电率和降低颗粒尺寸.Mn掺杂的Li3Fe2(PO4)3样品的恒电流充放电测试和伏安循环测试(2～4V)发现,所有样品中Fe3+/Fe2+氧化还原电对均有两个稳定的充放电平台(2.8、2.7V)、Li3+,Fe2-xMnxII(PO4)3和Li3Fe1.95Mn0.05(PO4)3中Mn3+/Mn2+电对的充放平台位于3.5V左右.不同价态Mn的掺杂均可明显提高正极材料的电化学性能,其中Mn掺杂样品的电化学性能最好,其中Li3.05Fel.95MnⅡ0.05(PO4)3/C的C/20和C/2恒流放电比容量分别可达11O和66mAh/g.

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