期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 21, 期 28, 页码 10437-10441出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm10408j
关键词
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资金
- Hong Kong Polytechnic University Grant Research Committee [A-PD1T]
- National Basic Research Program of China [2011CB933300]
- National Science Fund for Talent Training in Basic Science [J0830310]
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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