Mechanochemical synthesis and electrochemical characteristics of Mg2Sn as an anode material for Li-ion batteries

被引：67

作者：

Kim, H

Kim, YJ

Kim, DG

Sohn, HJ ^{[1
]}

Kang, T

机构：

[1] Seoul Natl Univ, Sch Mat Sci & Engn, Seoul 151742, South Korea

[2] Seoul Natl Univ, Dept Mineral & Petr Engn, Seoul 151742, South Korea

来源：

SOLID STATE IONICS | 2001年 / 144卷 / 1-2期

关键词：

Mg2Sn; mechanochemical synthesis; intermetallic compound; capacity retention; Li alloy electrode;

D O I：

10.1016/S0167-2738(01)00900-6

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：

Mg2Sn prepared by mechanochemical process was examined as an alternative anode material for Li-ion batteries. Electrochemical tests demonstrated that the initial charge and discharge capacity of Mg2Sn was 556 and 460 mAh/g, respectively. Ex-situ XRD and differential capacity plots showed that lithium inserted into the Mg2Sn lattice first followed by alloying with Sn. Contrary to the isostructural Mg-based intermetallic compound, Mg2Si, alloying reaction between Li and Mg was not observed during lithiation of Mg2Sn. Mg2Sn showed better capacity retention characteristic than that of Mg2Si. It is thought that this may be attributed to that Mg formed at Mg2Sn electrode did not react with lithium, and also active materials of Mg2Sn electrode changed from Mg2Sn to Sri with the increase of cycles. Also Mg2Sn showed improved cycle performance under restricted voltage range due to prevention Sn from aggregation into larger clusters. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：41 / 49

页数：9

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