Design and synthesis of Janus-structured mutually doped SnO2–Co3O4 hollow nanostructures as superior anode materials for lithium-ion batteries
Design and synthesis of Janus-structured mutually doped SnO2–Co3O4 hollow nanostructures as superior anode materials for lithium-ion batteries
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DOI：
10.1039/c7ta08335a
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发表时间：
2017-12
影响因子：
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通讯作者：
Gi Dae Park;Jung-Kul Lee;Y. Kang
中科院分区：
文献类型：
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作者：
Gi Dae Park;Jung-Kul Lee;Y. Kang
设计并合成了由相互掺杂的SnO 2-Co 3 O 4中空纳米结构组成的Janus结构材料，用作锂离子电池的高效负极材料。采用一锅喷雾热分解法制备了由Co掺杂SnSe纳米片和Sn掺杂CoSex多面体结构组成的Janus结构粉体。同样，通过纳米级Kirkendall扩散工艺制备了由Co掺杂的SnO 2空心纳米片和Sn掺杂的Co 3 O 4空心多面体结构组成的结构化SnO 2-Co 3 O 4粉末。空心SnO 2纳米片和Co 3 O 4多面体结构中的两种材料的掺杂提高了Janus结构的SnO 2-Co 3 O 4复合粉末的可逆容量和循环性能。这是通过在循环过程中使金属Sn和Co纳米晶体的生长最小化、改善Li 2 O的分解以及在脱锂过程中通过金属Co的催化作用促进Sn向SnO 2的转化来实现的。在1A g-1的电流密度下，第1000次循环的2为1058.7 mA h g-1。这种Janus结构的相互掺杂的SnO 2-Co 3 O 4复合粉末显示出优异的锂离子储存循环和倍率性能。
Janus-structured materials composed of mutually doped SnO2–Co3O4 hollow nanostructures were designed and synthesized for use as an efficient anode material for lithium-ion batteries. The Janus-structured powder consisting of Co-doped SnSe nanoplates and Sn-doped CoSex polyhedral structures was synthesized by a one-pot spray pyrolysis process. Similarly, the structured SnO2–Co3O4 powder consisting of Co-doped SnO2 hollow nanoplates and Sn-doped Co3O4 hollow polyhedral structures was prepared by a nanoscale Kirkendall diffusion process. The doping of both materials in the hollow SnO2 nanoplates and Co3O4 polyhedral structures improved the reversible capacities and cycling performances of the Janus-structured SnO2–Co3O4 composite powder. This was achieved by minimizing the growth of metallic Sn and Co nanocrystals during cycling, improving the decomposition of Li2O, and facilitating the conversion of Sn to SnO2 during the delithiation process through a catalytic effect of metallic Co. The discharge capacity of the Janus-structured SnO2–Co3O4 hollow powder with a Sn : Co ratio of 1 : 2 at a current density of 1 A g−1 for the 1000th cycle was 1058.7 mA h g−1. This Janus-structured mutually doped SnO2–Co3O4 composite powder showed extraordinary cycling and rate performances for lithium ion storage.