晶态Li12Si7锂离子电池负极材料的电化学性能研究

doi:10.13208/j.electrochem.160541

摘要/Abstract

摘要：

通过加热摩尔比为12:7的LiH/Si球磨混合物，避免了Li与Si之间巨大的熔点差异，成功制备了晶态Li₁₂Si₇合金，研究了其电化学性能和储锂机制. 发现Li₁₂Si₇在0.02 ~ 0.6 V的嵌脱锂过程中，只发生晶胞体积的变化，而不产生相变，呈现出明显的固溶储锂机制. 该固溶储锂机制的存在，有效抑制了Si基负极材料嵌脱锂过程中由于相变导致的体积效应，使得晶态Li₁₂Si₇在0.02 ~ 0.6 V电压范围内具有显著改善的电化学性能，其首次库伦效率高达100%，30次循环后的可逆容量保持率约为74%，分别优于相同条件下原始Si电极的55%和37%.

关键词: 锂离子电池, 负极材料, 锂硅合金, 电化学性能, 储锂机制

Abstract:

Crystalline Li₁₂Si₇ is successfully synthesized by heating the mixture of LiH and Si with a molar ratio of 12:7, which avoids the huge difference of the melting points between Li and Si. The electrochemical performance and lithium storage mechanism of the as-prepared Li12Si7 are studied in this work. It is found that only a change in cell volume takes place without a phase change during the lithiation/delithiation of Li₁₂Si₇ at a voltage range of 0.02 ~ 0.6 V, exhibiting a solid-solution lithium storage mechanism. Such a lithium storage process effectively retards the volume effect caused by the phase change during lithiation/delithiation of Si-based anode. This induces significantly the improved electrochemical properties of crystalline Li₁₂Si₇ while cycling at 0.02 ~ 0.6 V. The first Coulombic efficiency of crystalline Li₁₂Si₇ is determined to be as high as 100%, and the capacity retention is 74% after 30 cycles, which are distinctly higher than those of Si anode (55% and 37%, respectively) under identical conditions.

Key words: lithium-ion batteries, anode materials, Li-Si alloys, electrochemical properties, lithium storage mechanism

中图分类号:

TQ126.2
O646

杨亚雄，马瑞军，高明霞，潘洪革，刘永锋. 晶态Li₁₂Si₇锂离子电池负极材料的电化学性能研究[J]. 电化学（中英文）, 2016, 22(5): 521-527.

YANG Ya-xiong, MA Rui-jun, GAO Ming-xia, PAN Hong-ge, LIU Yong-feng. Electrochemical Performance of Crystalline Li₁₂Si₇as Anode Material for Lithium Ion Battery[J]. Journal of Electrochemistry, 2016, 22(5): 521-527.

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晶态Li₁₂Si₇锂离子电池负极材料的电化学性能研究

Electrochemical Performance of Crystalline Li₁₂Si₇as Anode Material for Lithium Ion Battery

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