Hollow 0.3Li2MnO3•0.7LiNi0.5Mn0.5O2 microspheres as a high-performance cathode material for lithium-ion batteries
Hollow 0.3Li2MnO3•0.7LiNi0.5Mn0.5O2 microspheres as a high-performance cathode material for lithium-ion batteries
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DOI：
10.1039/c2cp44394e
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发表时间：
2013-01-01
影响因子：
3.3
通讯作者：
Huang, Yunhui
中科院分区：
文献类型：
--
作者：
Jiang, Yan;Yang, Ze;Huang, Yunhui
通过简单的原位模板牺牲路线大规模合成了空心0.3Li(2)MnO(3)中心点0.7LiNi(0.5)Mn(0.5)O(2)微球。以多孔MnO2微球为原料，通过纳米级柯肯德尔效应形成0.3Li(2)MnO(3)中心点0.7LiNi(0.5)Mn(0.5)O(2)纳米晶组装而成的空心微球。纳米晶组装的空心0.3Li(2)MnO(3)中心点0.7LiNi(0.5)Mn(0.5)O(2)微球在100次循环中表现出高达295 mAh g(-1)的高可逆容量和优异的倍率性能(1000 mA g(-1)时为125 mAh g(-1))。得益于独特的中空和纳米晶体结构，与传统溶胶-凝胶/固态反应方法获得的产品相比，所形成的中空微球表现出大大增强的高温（55℃）电化学性能。这项工作表明，基于当前原位模板牺牲方法的制造策略为设计用于锂离子电池应用的具有中空内部的高性能正极材料提供了一种新方法。
Hollow 0.3Li(2)MnO(3)center dot 0.7LiNi(0.5)Mn(0.5)O(2) microspheres are synthesized on a large scale through a simple in situ template-sacrificial route. Starting from porous MnO2 microspheres, the hollow microspheres assembled with 0.3Li(2)MnO(3)center dot 0.7LiNi(0.5)Mn(0.5)O(2) nanocrystals are formed by a nanoscale Kirkendall effect. The nanocrystal-assembled hollow 0.3Li(2)MnO(3)center dot 0.7LiNi(0.5)Mn(0.5)O(2) microspheres exhibit a highly reversible capacity as high as 295 mAh g(-1) over 100 cycles and excellent rate capability (125 mAh g(-1) at 1000 mA g(-1)). Benefitting from a unique hollow and nanocrystalline architecture, the as-formed hollow microspheres show much enhanced high-temperature (55 degrees C) electrochemical performances, compared with the products obtained by conventional sol-gel/solid-state reaction methods. This work demonstrates that a fabrication strategy based on the present in situ template-sacrificial approach offers a new method for the design of high-performance cathode materials with hollow interiors for Li-ion battery applications.