Synthesis of nanoarchitectured LiNi0.5Mn0.5O2 spheres for high-performance rechargeable lithium-ion batteries via an in situ conversion route

被引：31
作者：
Liu, Yumin [1 ,2 ]
Chen, Bolei [1 ,2 ]
Cao, Feng [1 ]
Zhao, Xingzhong [2 ]
Yuan, Jikang [1 ]
机构：
[1] Hong Kong Polytech Univ, Dept Appl Phys, Hong Kong, Hong Kong, Peoples R China
[2] Wuhan Univ, Sch Phys & Technol, Wuhan 430072, Peoples R China
来源：
JOURNAL OF MATERIALS CHEMISTRY | 2011年 / 21卷 / 28期
关键词：
CATHODE MATERIALS; LI-ION; ELECTRODE MATERIALS; HIGH-CAPACITY;
D O I：
10.1039/c1jm10408j
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
LiNi0.5Mn0.5O2 nanoarchitectured spheres (NA-LiNi0.5Mn0.5O2) have been synthesized via an in situ conversion route derived from the use of gamma-MnO2 hollow nanostructured spheres. The complete conversion of the gamma-MnO2 precursor to layered alpha-NaFeO2-type NA-LiNi0.5Mn0.5O2 has been confirmed by XRD, FE-SEM, TEM, and HR-TEM. This NA-LiNi0.5Mn0.5O2 cathode exhibits a remarkable enhancement of rate performance compared with that of LiNi0.5Mn0.5O2 particles prepared by a conventional solid-state reaction method (SS-LiNi0.5Mn0.5O2). The batteries based on NA-LiNi0.5Mn0.5O2 retain a discharge capacity of 153.5 mA h g(-1) (93% of the first discharge capacity) after 75 cycles. A specific discharge capacity of 121.9 mA h g(-1) was retained at a rate of 3.2 C, which is about 70% of the capacity at a rate of 0.2 C.
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收藏
页码：10437 / 10441
页数：5
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