Structure and electrochemical properties of LiMnBO3 as a new cathode material for lithium-ion batteries
Structure and electrochemical properties of LiMnBO3 as a new cathode material for lithium-ion batteries
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新型锂离子电池正极材料LiMnBO3的结构和电化学性能
DOI：
10.1016/j.jallcom.2010.01.065
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发表时间：
2010-04
影响因子：
6.2
通讯作者：
An, Xiaoning
中科院分区：
文献类型：
--
作者：
Zhao, Yanming;Kuang, Quan;Liu, Jianmin;Chen, Yinghua;Chen, Ling;Dong, Youzhong;An, Xiaoning
在不使用炭黑为原料的情况下，通过一步固相反应在高于 850 {sup o}C 的温度下获得单相硼酸锰锂 LiMnBO{sub 3}。在5mA/g的电流密度下，正极活性材料的初始比放电容量为75.5mAh/g，并且除第一次循环外，每个循环的平均容量衰减为0.09%。即使在50 mA/g的电流密度下，LiMnBO{sub 3}化合物仍保持42.3 mAh/g的比放电容量，并且在40个循环期间，每个循环的容量衰减仅为0.2%。循环伏安图（CV）曲线表明，在阳极和阴极扫描过程中可以清楚地观察到位于2.23和4.13 V的Mn{sup 3+}/Mn{sup 2+}氧化还原对。结合循环伏安图结果和循环前后电极的X射线衍射图，循环过程中峰值电流和峰值电位没有显着变化，预计该化合物中锂离子的脱嵌和嵌入是完全可逆的，并且在高充放电倍率下长循环后仍能保持LiMnBO{sub 3}的六方结构。
Single-phase lithium manganese borate, LiMnBO{sub 3}, was obtained at the temperature higher than 850 {sup o}C by one-step solid state reaction without using carbon black in the starting materials. The initial specific discharge capacity for the cathode active material was 75.5 mAh/g at the current density of 5 mA/g and the mean fade of capacity was 0.09% per cycle except for the first cycle. The LiMnBO{sub 3} compound maintained a specific discharge capacity of 42.3 mAh/g even at the current density of 50 mA/g and the capacity fade per cycle was only 0.2% during 40 cycles. The cyclic voltammograms (CV) curves show that the Mn{sup 3+}/Mn{sup 2+} redox couple situated at 2.23 and 4.13 V can be clearly observed during anodic and cathodic sweeps. Combined the cyclic voltammograms results with the X-ray diffraction patterns of electrodes before and after cycling, where no significant change of the peak currents and the peak potentials during cycling, it was anticipated that the extraction and insertion of Li-ions are totally reversible in this compounds and the hexagonal structure for LiMnBO{sub 3} can be maintained after long cycles under high charge and discharge rate.
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