期刊
ADVANCED ENERGY MATERIALS
卷 3, 期 12, 页码 1623-1629出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201300510
关键词
lithium-ion batteries; cathodes; electrode materials; solid solutions; electrochemistry; lithium manganese oxide
类别
资金
- Secondary Battery R&D program for Leading Green Industry from the MOTIE/KEIT [10042840]
- Ministry of Science, ICT&Future Planning (MSIP), Korea, under the Convergence Information Technology Research Center (C-ITRC) support program [NIPA-2013-H0301-13-1009]
Spinel cathodes comprising 16-m, AlPO4-coated Li1.09Mn1.83Al0.08O4 with a high energy density of 1.2 W h cm(-3) are synthesized via a conventional solid-state reaction using MnO2 and Li2CO3 at 770 degrees C for 10 h and using a solution-based coating method in bulk scale (>20 kg). The cathodes are coated by aluminum phosphate at a thickness of <10 nm. The coated cathodes exhibit a first discharge capacity of 108 mAh g(-1) and a coulombic efficiency of >99.8%, and their capacity retention is 78% after 200 cycles at a 0.5C rate in a Li-ion cell under 60 degrees C. More importantly, a Li-ion cell containing the coated cathode does not exhibit a swelling problem after 200 cycles at 60 degrees C. Transmission and scanning electron microscopy suggest that the uniformly distributed AlPO4 coating and the possible formation of a solid solution phase along the surface play key roles in enhancing the electrochemical performance of the LiMn2O4 spinel at 60 degrees C.
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