Lithiation behavior of single-phase Cu-Sn intermetallics and effects on their negative-electrode properties
Lithiation behavior of single-phase Cu-Sn intermetallics and effects on their negative-electrode properties
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DOI：
10.1016/j.electacta.2013.03.035
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发表时间：
2013-05-30
影响因子：
6.6
通讯作者：
Murase, Kuniaki
中科院分区：
文献类型：
--
作者：
Kitada, Atsushi;Fukuda, Naoki;Murase, Kuniaki
单相Cu-Sn金属间化合物被用来研究它们在锂化/脱锂过程中的相变，以及它们的负极性能。化学计量比的Cu-Sn样品制备的结晶保证相使用还原扩散法与控制电位。恒电位锂化实验表明，Cu 3Sn直接转化为LixSn，而Cu 6Sn 5在LixSn形成之前先转化为Li 2CuSn。我们还揭示了从Li 2CuSn分离成Cu和LixSn发生在相对于Li的+0.11至+0.10 V。此外，截止电位为+1.5 V至+0.11 V的充电/放电测试显示出比+1.5 V至+0.00 V的充电/放电测试更好的循环性能，这可能是由于抑制了LixSn的形成。这种趋势在其他Cu 6Sn 5电极材料中也是可以预期的。(C)2013爱思唯尔有限公司保留所有权利。
Single-phase Cu-Sn intermetallics were used to investigate their phase transformations during lithiation/delithiation, together with their negative-electrode properties. The stoichiometric Cu-Sn samples were prepared as thermodynamically warranted phases using a reduction-diffusion method with controlled potentials. Potentiostatic lithiation tests suggested that Cu3Sn directly changes into LixSn, while Cu6Sn5 becomes Li2CuSn before LixSn forms. We also revealed that separation from Li2CuSn into Cu and LixSn occurs at +0.11 to +0.10 V vs. Li. Additionally, charging/discharging tests with cutoff potentials of +1.5 V to +0.11 V showed better cycling performance than that with +1.5 V to +0.00 V. probably due to the suppression of LixSn formation. Such a tendency can be expected in other Cu6Sn5 electrode materials. (C) 2013 Elsevier Ltd. All rights reserved.