Exploring the Li-Ga room temperature phase diagram and the electrochemical performances of the LixGay alloys vs. Li

被引：83

作者：

Saint, J ^{[1
]}

Morcrette, M ^{[1
]}

Larcher, D ^{[1
]}

Tarascon, JM ^{[1
]}

机构：

[1] Univ Picardie Jules Verne, Lab React & Chim Solides, UMR 6007, F-80039 Amiens, France

来源：

SOLID STATE IONICS | 2005年 / 176卷 / 1-2期

关键词：

Li-Ga; electrochemical performance; LixGay; alloys;

D O I：

10.1016/j.ssi.2004.05.021

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Li2Ga7, LiGa, and Li2Ga alloys were synthesized by ball-milling, from Li powders and Ga ingots, and characterized for their structural and electrochemical performances. Special attention was devoted to the Li-driven 3D(LiGa) --> 2D(Li2Ga) transformation that occurs at 0.02 V vs. Li+/Li on discharge. By in situ X-ray measurements we demonstrated that such a transition, accompanied by a 60% volume change, is initially nicely reversible, but rapidly becomes detrimental to the cell capacity retention upon cycling. Bypassing the (LiGa) --> (Li2Ga) transition was shown to considerably increase our cell performances, with capacity retention curves levelling at 300 mA h/g for at least 20 cycles. (C) 2004 Published by Elsevier B.V.

引用

页码：189 / 197

页数：9

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