Cubic Crystal-Structured SnTe for Superior Li- and Na-Ion Battery Anodes.
Cubic Crystal-Structured SnTe for Superior Li- and Na-Ion Battery Anodes.
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DOI：
10.1021/acsnano.7b02039
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发表时间：
2017-05
期刊：
影响因子：
17.1
通讯作者：
Ah-Ram Park;Cheol‐Min Park
中科院分区：
文献类型：
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作者：
Ah-Ram Park;Cheol‐Min Park
采用固相法合成了一种立方晶体结构的锡基化合物SnTe，并对其作为锂离子电池（LIBs）和钠离子电池（NIBs）高容量负极材料的可能性进行了研究。电化学驱动的相变机制的SnTe电极在锂和钠的插入/提取过程中进行了彻底检查，利用各种非原位分析技术。在Li嵌入过程中，SnTe转变为Li4.25Sn和Li 2 Te;而在Na嵌入过程中，SnTe经历了一个连续的拓扑转变过程，即先转变为NaxSnTe（x ≤ 1.5），再转变为Na3.75Sn和Na 2 Te，并在Li和Na被完全提取后重新组合成原来的SnTe相。独特的相变机制提供了显着的电化学锂和钠离子存储性能，如大的可逆容量与高库仑效率和稳定的循环能力与快速的C-速率特性，通过制备非晶C-修饰的纳米结构的SnTe基复合材料。因此，SnTe，其有趣的相变机制，将是一个有前途的替代即将到来的一代的阳极材料的LIB和NIB。
A cubic crystal-structured Sn-based compound, SnTe, was easily synthesized using a solid-state synthetic process to produce a better rechargeable battery, and its possible application as a Sn-based high-capacity anode material for Li-ion batteries (LIBs) and Na-ion batteries (NIBs) was investigated. The electrochemically driven phase change mechanisms of the SnTe electrodes during Li and Na insertion/extraction were thoroughly examined utilizing various ex situ analytical techniques. During Li insertion, SnTe was converted to Li4.25Sn and Li2Te; meanwhile, during Na insertion, SnTe experienced a sequential topotactic transition to NaxSnTe (x ≤ 1.5) and conversion to Na3.75Sn and Na2Te, which recombined into the original SnTe phase after full Li and Na extraction. The distinctive phase change mechanisms provided remarkable electrochemical Li- and Na-ion storage performances, such as large reversible capacities with high Coulombic efficiencies and stable cyclabilities with fast C-rate characteristics, by preparing amorphous-C-decorated nanostructured SnTe-based composites. Therefore, SnTe, with its interesting phase change mechanisms, will be a promising alternative for the oncoming generation of anode materials for LIBs and NIBs.