Study on the insertion behaviors of Lithium-ions into CoFe3Sb12 based electrodes
Study on the insertion behaviors of Lithium-ions into CoFe3Sb12 based electrodes
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DOI：
10.1016/s0378-7753(00)00624-8
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发表时间：
2001-02
影响因子：
9.2
通讯作者：
Luming Zhang;X. Zhao;X. B. Jiang;C. Lv;G. Cao
中科院分区：
文献类型：
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作者：
Luming Zhang;X. Zhao;X. B. Jiang;C. Lv;G. Cao
采用锂离子电池正极模型Li对CoFe 3Sb 12基多相材料的电化学性能进行了研究|LiPF6（EC+DMC）|CoFe 3Sb 12.可逆容量约为490 mAhg −1（约为100 mAhg −1）。3430mAhcm-3）。在前10次循环中，可逆容量保持在240 mAhg-1以上。结果表明，循环寿命和电荷恢复能力与颗粒大小和导电添加剂密切相关。采用非原位XRD分析了锂嵌入CoFe 3Sb 12电极的机理。结果发现，在第一次放电中，有两种不同类型的插入反应。一种是拓扑异构反应，另一种是重构反应。用交流阻抗法测定了首次放电时CoFe_3Sb_（12）中锂的化学扩散系数D_（？）Li与锂含量x的关系。
The electrochemical properties of multiphase CoFe3Sb12based materials were studied with lithium anode model cell Li|LiPF6(EC+DMC) |CoFe3Sb12. A reversible capacity of about 490mAhg−1(ca. 3430mAhcm−3) has been obtained in the first cycle. The reversible capacity keeps above 240mAhg−1in the first 10 cycles. It was found that the cycle life and charge recovery are strongly dependent on particle size and conducting additive. The mechanism of lithium insertion into CoFe3Sb12electrode was analyzed by ex situ XRD. It was found that there were two different types of the insertion reactions in the first discharge. One type is topotactic reaction and the other is reconstitution reaction. The chemical diffusion coefficient D ̃Liversus lithium content x in CoFe3Sb12has been examined by EIS for the first discharge.