以Mn_3O_4为前驱体的LiMn_2O_4及其电化学性能

对传统的固相反应进行了改进，以控制结晶法合成出来的Ｍｎ３Ｏ４为前驱体，和ＬｉＯＨ混合煅烧，制备出锂离子电池正极活性材料尖晶石ＬｉＭｎ２Ｏ４。对由此方法得到的尖晶石ＬｉＭｎ２Ｏ４的结构和电化学性能进行了研究．通过Ｘ光衍射和扫描电镜分析表明，该材料为纯相尖晶石ＬｉＭｎ２Ｏ４，不含其它杂质相，而且晶粒大小比较均匀；通过电化学性能测试表明，该尖晶石ＬｉＭｎ２Ｏ４具有良好的电化学性能：其首次放电比容量为１２８ｍＡｈ／ｇ，经过１０次充放电循环后，其放电比容量仍有 １２４ｍＡｈ／ｇ．

Electrochemical Performance of LiMn_2O_4 Synthesized from Precursor Mn_3O_4

A positive active material of spinel LiMn2O4 for lithium-ion batteries was synthesized through a modified solid phase reaction. In this process, LiOH and precursor Mn3O4 obtained from controlled crystallization were mixed togather and incinerated to prepare spinel LiMn2O4. Structure and electrochemical properties of the spinel LiMn2O4 were studied. The results of XRD and SEM prove that the material prepared through above method is a pure phase of spinel LiMn2O4 and the sizes of the crystallites are uniform. Electrochemical property tests show that the spinel LiMn2O4 has excellent eletrochemical properties: its initial discharge specific capacity is 128mAh/g, and the discharge specific capacity of the 10th cycle is still 124mAh/g.