Porous layered lithium-rich oxide nanorods: Synthesis and performances as cathode of lithium ion battery
Porous layered lithium-rich oxide nanorods: Synthesis and performances as cathode of lithium ion battery
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多孔层状富锂氧化物纳米棒的合成及其作为锂离子电池正极的性能
DOI：
10.1016/j.electacta.2014.12.037
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发表时间：
2015-02-01
影响因子：
6.6
通讯作者：
Li, Weishan
中科院分区：
文献类型：
--
作者：
Chen, Dongrui;Yu, Qipeng;Li, Weishan
在反胶束微乳液体系中，通过锰和钴的共晶化反应合成了层状富锂氧化物Li[Li0.19Mn0.32Co0.49] O-2。对合成的氧化物作为锂离子电池正极材料的物理性能和电化学性能进行了评价。X射线衍射、扫描电子显微镜和透射电子显微镜的物理表征表明，所合成的氧化物呈长约1 μ m、直径约200 nm的纳米棒形貌，由约20 nm的亚基纳米颗粒组成，具有分级孔结构。电化学测试表明，与通过固态反应引入过渡金属合成的样品相比，合成的氧化物具有更好的充放电性能：更少的极化、更大的放电容量、更高的倍率性能和更好的循环稳定性。(C)2014爱思唯尔有限公司版权所有。
A layered lithium-rich oxide, Li[Li0.19Mn0.32Co0.49] O-2, is synthesized by introducing manganese and cobalt via oxalates co-crystallization in reverse micellar microemulsion. The physical and electrochemical performances of the as-synthesized oxide are evaluated as cathode of lithium ion battery. The physical characterizations, from X-ray diffraction, scanning electron microscope and transmission electron microscope, indicate that the as-synthesized oxide takes a nanorod morphology of up to 1 mu m in length and 200 nm in diameter, which is composed of about 20nm subunit nanoparticles, and possesses a hierarchical pore structure. Electrochemical measurements demonstrate that the as-synthesized oxide exhibits improved charge/discharge performances: less polarization, larger discharge capacity, higher rate capability, and better cyclic stability, compared to the sample synthesized by introducing the transition metals in solid-state reaction. (C) 2014 Elsevier Ltd. All rights reserved.