Unique Urchin-like Ca2Ge7O16 Hierarchical Hollow Microspheres as Anode Material for the Lithium Ion Battery.
Unique Urchin-like Ca2Ge7O16 Hierarchical Hollow Microspheres as Anode Material for the Lithium Ion Battery.
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独特的海胆状Ca2Ge7O16多级中空微球作为锂离子电池负极材料
DOI：
10.1038/srep11326
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发表时间：
2015-06-10
影响因子：
4.6
通讯作者：
Guo Z
中科院分区：
文献类型：
--
作者：
Li D;Feng C;Liu HK;Guo Z
Ge是一种性能优异的负极材料，尤其是倍率性能，但由于其在地壳中的稀有以及锂的插入和提取过程中的巨大体积变化，其高昂的价格阻碍了它的发展。在锗材料中引入其他更便宜的元素是冲淡高昂价格的有效方法，但通常会牺牲其电化学性能。通过纳米结构设计和廉价元素(钙)的引入相结合，成功地制备了海胆状Ca2Ge7O16分级中空微球，以降低成本并保持锗材料良好的电化学性能。在不同电解液中的电化学测试结果表明，碳酸亚乙酯/碳酸二甲酯/碳酸二乙酯(体积比为3/4/3)和5wt%的碳酸氟乙烯添加剂是最合适的电解液。电化学测试表明，所合成的Ca2Ge7O16中空微球在电流密度为804.6 mA g−1下100次循环后的可逆比容量高达804.6 mA h g−1，在电流密度为4 A g−1下的倍率性能为341.3 mA h g−1。根据生长过程的实验结果提出了其生长机理。
Germanium is an outstanding anode material in terms of electrochemical performance, especially rate capability, but its developments are hindered by its high price because it is rare in the crust of earth and its huge volume variation during the lithium insertion and extraction. Introducing other cheaper elements into the germanium-based material is an efficient way to dilute the high price, but normally sacrifice its electrochemical performance. By the combination of nanostructure design and cheap element (calcium) introduction, urchin-like Ca2Ge7O16 hierarchical hollow microspheres have been successfully developed in order to reduce the price and maintain the good electrochemical properties of germanium-based material. The electrochemical test results in different electrolytes show that ethylene carbonate/dimethyl carbonate/diethyl carbonate (3/4/3 by volume) with 5 wt% fluoroethylene carbonate additive is the most suitable solvent for the electrolyte. From the electrochemical evaluation, the as-synthesized Ca2Ge7O16 hollow microspheres exhibit high reversible specific capacity of up to 804.6 mA h g−1 at a current density of 100 mA g−1 after 100 cycles and remarkable rate capability of 341.3 mA h g−1 at a current density of 4 A g−1. The growth mechanism is proposed based on our experimental results on the growth process.
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