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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >The phase transformations and cycling performance of copper-tin alloy anode materials synthesized by sputtering
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The phase transformations and cycling performance of copper-tin alloy anode materials synthesized by sputtering

机译：溅射合成铜锡合金负极材料的相变和循环性能

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摘要

A sputtering technique was adopted to synthesize Sn-Cu thin film electrodes. Island Sn particles were obtained on the copper foil. Cu_6Sn_5 was spontaneously generated at the interface between Sn and Cu foil. To further improve the cycling stability, Cu source was introduced to increase the formation of Cu_6Sn_5 and to serve as a buffer during cycling. Moreover, the phase and elemental ratio of Sn and Cu varied in the synthesized electrode by alternately adjusting sputtering time for Sn and Cu. The cell synthesized by sputtering Sn for 5 min and Cu for 9 s alternately exhibited the best cycling stability. The 1 st charge capacity of cell was 635 mA hg~(-1), and the 1 st efficiency was even higher than 97%. The capacity remained higher than 500 mA hg~(-1) after 15 cycles. The phase transformation of cell was investigated through voltage profile, CV curve and in situ XRD analysis. The in situ XRD analysis confirmed that Cu_6Sn_5 could react with lithium directly without the presence of Li_2CuSn during cycling. The reaction mechanism of Cu_6Sn_5 with lithium during cycling was demonstrated to be an alloying process, and the structure of Cu_6Sn_5 was thus a low-temperature monoclinic phase.
机译：采用溅射技术合成Sn-Cu薄膜电极。在铜箔上获得岛锡颗粒。在Sn和Cu箔之间的界面处自发生成Cu_6Sn_5。为了进一步提高循环稳定性，引入了铜源以增加Cu_6Sn_5的形成并在循环过程中用作缓冲剂。此外，通过交替调节Sn和Cu的溅射时间，在合成电极中Sn和Cu的相和元素比改变。通过溅射Sn 5分钟和Cu 9 s合成的电池交替表现出最佳的循环稳定性。电池的第一充电容量为635 mA hg〜（-1），第一充电效率甚至高于97％。 15个循环后，容量仍高于500 mA hg〜（-1）。通过电压分布，CV曲线和原位XRD分析研究了电池的相变。原位X射线衍射（XRD）分析证实Cu_6Sn_5可以与锂直接反应，而在循环过程中不存在Li_2CuSn。 Cu_6Sn_5与锂在循环过程中的反应机理被证明是合金化过程，因此Cu_6Sn_5的结构为低温单斜晶相。

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