Etching-free template synthesis of double-shelled hollow SiO2@SnO2@C composite as high performance lithium-ion battery anode
Etching-free template synthesis of double-shelled hollow SiO2@SnO2@C composite as high performance lithium-ion battery anode
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DOI：
10.1016/j.jallcom.2019.151793
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发表时间：
2019-11-15
影响因子：
6.2
通讯作者：
Yang, Li
中科院分区：
文献类型：
--
作者：
Tian, Qinghua;Chen, Yanbin;Yang, Li
SiO2具有易于制备、形貌可调等优点，常被用作牺牲模板来制备空心SnO2基复合锂离子电池负极材料。然而，后续去除SiO2模板往往需要使用氢氟酸、强碱溶液等强腐蚀性溶剂，这对实验人员的健康和环境不利，需要避免。本文以预制的空心SiO2球为模板合成了双壳空心SiO2@SnO2@C复合材料，但不去除，从而避免了强腐蚀性溶剂的使用。此外，所制备的SiO2@SnO2@C复合材料在作为锂离子电池负极材料进行测试时表现出出色的电化学储锂性能（分别在200和1000 mA g(-1)下循环340次甚至1000次后仍保持923和538 mAh g(-1)的高可逆容量），甚至优于报道的最先进的SnO2/C复合材料。因此，这项工作可能为通过简便的免蚀刻SiO2模板辅助方法制备具有可调节结构的先进SnO2基阳极提供了新的视角。这里提到的这个概念也可以扩展到能够承受剧烈体积变化的其他混合阳极材料的制备。 (C) 2019 Elsevier B.V. 保留所有权利。
With merits such as ease of preparation and adjustable morphology, SiO2 is commonly used as a sacrifice template to prepare hollow SnO2-based composite anode materials for lithium-ion batteries. However, the following removal of SiO2 template often involves the use of highly corrosive solvents such as hydrofluoric acid and strong base solution, which is detrimental to the health of the experimenters, and the environment, thus needs to be avoided. Herein, a double-shelled hollow SiO2@SnO2@C composite has been synthesized by using prefabricated hollow SiO2 spheres as template but not be removed, thereby avoiding the use of strong corrosive solvents. Moreover, the as-prepared SiO2@SnO2@C composite demonstrates outstanding electrochemical lithium storage performances when examined as a lithium-ion battery anode material ( high reversible capacities of 923 and 538 mAh g(-1) are remained after 340 and even 1000 cycles at 200 and 1000 mA g(-1) respectively), and even better than those of reported state-of-the-art SnO2/C composites. Thus, it is suggested that this work may offer a new viewpoint to the preparation of advanced SnO2-based anodes with adjustable structures by facile etching-free SiO2 template assisted approaches. This concept mentioned here may also be extended to preparation of other hybrid anode materials capable of withstanding drastic volume variation. (C) 2019 Elsevier B.V. All rights reserved.