Improved electrochemical performance of ternary Sn-Sb-Cu nanospheres as anode materials for lithium-ion batteries
Improved electrochemical performance of ternary Sn-Sb-Cu nanospheres as anode materials for lithium-ion batteries
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改善锂离子电池负极材料Sn-Sb-Cu三元纳米球的电化学性能
DOI：
10.1007/s12598-014-0303-6
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发表时间：
2020-10-01
期刊：
影响因子：
8.8
通讯作者：
Wang, Qi
中科院分区：
文献类型：
--
作者：
Yang, Rong;Zhang, Xiang-Jun;Wang, Qi
采用金属氯化物在碱性溶液中共还原的方法成功地合成了Sn-Sb-Cu三元合金纳米粒子。透射电子显微镜（TEM）结果表明，所制备的Sn-Sb-Cu纳米粒子具有特殊的中空结构，粒径均匀，为10-20 nm。由于合成体系中没有硬模板，提出了一种电流位移反应机制来解释中空纳米结构的形成。当该合金粉末用作锂离子电池的负极材料时，它们表现出相对高的电化学容量和良好的循环保持性。良好的电化学性能可以归因于非活性Cu物种。在电化学反应期间，中空结构中的非活性铜相充当柔软且可延展的基质，其消除了由锂插入和提取期间的严重体积变化引起的机械应力。Sn-Sb-Cu合金具有较高的可逆容量，是一种很有前途的锂离子二次电池负极材料。
Ternary Sn-Sb-Cu alloy nanoparticles were successfully synthesized via co-reduction of metal chlorides in aqueous alkaline solution. The results of the transmission electron microscopy (TEM) show that the as prepared Sn-Sb-Cu nanoparticles have a specific hollow structure with a uniform particle size of 10-20 nm. As there are not any hard templates in the synthesis system, a galvanic displacement reaction mechanism is proposed to account for the formation of the hollow nanostructures. When the alloy powders are used as anode materials for lithium-ion batteries, they exhibit relatively high electrochemical capacity and good cyclic retention. The good electrochemical performance can be attributed to the inactive Cu species. During electrochemical reactions, the inactive copper phase in the hollow structure serves as a soft and ductile matrix, which alleviates the mechanical stresses caused by the severe volume change during lithium insertion and extraction. With their high reversible capacities, the Sn-Sb-Cu alloys are a promising candidate as the anode material of rechargeable lithium-ion batteries.