Cu6Sn5@SnO2-C nanocomposite with stable core/shell structure as a high reversible anode for Li-ion batteries
Cu6Sn5@SnO2-C nanocomposite with stable core/shell structure as a high reversible anode for Li-ion batteries
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具有稳定核/壳结构的Cu6Sn5@SnO2-C纳米复合材料作为锂离子电池高可逆负极
DOI：
10.1016/j.nanoen.2015.10.037
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发表时间：
2015-11-01
期刊：
影响因子：
17.6
通讯作者：
Liu, Meilin
中科院分区：
文献类型：
--
作者：
Hu, Renzong;Waller, Gordon Henry;Liu, Meilin
锡基电极因其在提供高能量和功率密度同时保持优异的循环稳定性的潜力而备受关注。在此，我们报告了高性能 Cu6Sn5@SnO2-C 电极的合理设计和合成的结果，该电极是一种具有独特核/壳结构的锡基阳极，由锡铜金属间化合物 (Cu6Sn5) 核和二氧化锡 (SnO2)/碳 (C) 壳组成。该杂化结构是通过简单且经济高效的两步过程合成的。当用作电极时，Cu6Sn5@SnO2-C杂化纳米复合材料在0.05至3.0 V之间相对于Li/Li+在0.2 A/g下循环500次后表现出619 mA h/g的可逆容量，在1.1-2.0 V电位范围内SnO2的可逆转化反应具有类似于300 mA h/g的稳定容量。的体积变化 Cu6Sn5@SnO2-C电极在循环过程中相对较小（12.7%），因此Cu6Sn5核心成分和核/壳结构在多次循环中保持相对稳定，从而显着增强了反应可逆性和循环稳定性。 (C) 2015 Elsevier Ltd. 保留所有权利。
Tin-based electrodes have attracted much attention because of their potential to offer high energy and power density while maitaining excellent cycling stability. Here we report our findings from the rational design and synthesis of a high-performance Cu6Sn5@SnO2-C electrode, a tin-based anode with a unique core/shell structure consisting of a tin-copper intermetallic (Cu6Sn5) core and a tin dioxide (SnO2)/carbon (C) shell. The hybrid structure was synthesized by a simple and cost-effective two-step process. When used as an electrode, the Cu6Sn5@SnO2-C hybrid nanocomposite demonstrated a reversible capacity of 619 mA h/g after 500 cycles between 0.05 and 3.0 V vs. Li/Li+ at 0.2 A/g, with stable capacities of similar to 300 mA h/g from the reversible conversion reaction of SnO2 in a potential range of 1.1-2.0 V. Results suggest that the maximum volume change of the Cu6Sn5@SnO2-C electrode during cycling was relatively small (12.7%) so that the Cu6Sn5 core components and the core/shell structure remained relatively stable over many cycles, leading to significantly enhanced reaction reversibility and cycling stability. (C) 2015 Elsevier Ltd. All rights reserved.