Electrochemical Performance of Crystalline Li12Si7 as Anode Material for Lithium Ion Battery

doi:10.13208/j.electrochem.160541

Abstract

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

CLC Number:

TQ126.2
O646

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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Electrochemical Performance of Crystalline Li₁₂Si₇as Anode Material for Lithium Ion Battery

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