Sb nanoparticles encapsulated into porous carbon matrixes for high-performance lithium-ion battery anodes

Sb nanoparticles encapsulated into porous carbon matrixes for high-performance lithium-ion battery anodes
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封装在多孔碳基质中的锑纳米颗粒用于高性能锂离子电池阳极

DOI:
10.1016/j.jpowsour.2016.09.027
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发表时间:
2016-11
影响因子:
9.2
通讯作者:
Limin Wang
Limin Wang
中科院分区:
工程技术2区
文献类型:
--
作者:
Zheng Yi;Qigang Han;Ping Zan;Yaoming Wu;Yong Cheng;Limin Wang

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以金属有机骨架为模板,采用原电池置换反应技术成功制备了一种新型的Sb/C多面体复合材料。在该复合材料中,平均尺寸为15 nm的超小Sb纳米颗粒被均匀地封装到碳基体中,形成具有纳米尺寸构建块的分级多孔结构。作为锂离子电池的负极材料,该复合材料表现出高的锂储存容量、优异的倍率性能和优越的上级循环稳定性,高于许多报道的结果。值得注意的是,在100次重复循环后,在0.2 A g-1的电流密度下提供了565 mAh g-1的放电容量。即使在1 A g-1的高电流密度下,在500次循环后也保持400.5 mAh g-1的放电容量。所设计的Sb/C复合材料的这种上级循环稳定性和倍率放电性能可以归因于Sb纳米颗粒和多孔碳基体之间的协同效应。
A novel Sb/C polyhedra composite is successfully fabricated by a galvanic replacement reaction technique using metal organic frameworks as templates. In this composite, the ultrasmall Sb nanoparticles with an average size of 15 nm are homogeneously encapsulated into the carbon matrixes, forming a hierarchical porous structure with nanosized building blocks. Used as an anode material for lithium ion batteries, this composite exhibits high lithium storage capacities, excellent rate capability and superior cycle stability, higher than many reported results. Notably, a discharge capacity of 565 mAh g−1at a current density of 0.2 A g−1is delivered after 100 repeated cycles. Even at a high current density of 1 A g−1, a discharge capacity of 400.5 mAh g−1is also maintained after 500 cycles. Such superior cycling stability and rate discharge performance of the designed Sb/C composite can be attributed to the synergistic effect between Sb nanoparticles and the porous carbon matrixes.
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