%0 Journal Article
%T 晶态Li<sub>12</sub>Si<sub>7</sub>锂离子电池负极材料的电化学性能研究<br>Electrochemical Performance of Crystalline Li<sub>12</sub>Si<sub>7 </sub>as Anode Material for Lithium Ion Battery
%A 杨亚雄
%A 马瑞军
%A 高明霞
%A 潘洪革
%A 刘永锋&lt
%A br&gt
%A YANG Ya-xiong
%A MA Rui-jun
%A GAO Ming-xia
%A PAN Hong-ge
%A LIU Yong-feng
%J 电化学
%D 2016
%R 10.13208/j.electrochem.160541
%X 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%.<br>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
%K 锂离子电池
%K 负极材料
%K 锂硅合金
%K 电化学性能
%K 储锂机制
%K &lt
%K br&gt
%K lithium-ion batteries
%K anode materials
%K Li-Si alloys
%K electrochemical properties
%K lithium storage mechanism
%U http://electrochem.xmu.edu.cn/CN/abstract/abstract10294.shtml