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Indexed by:期刊论文

Date of Publication:2013-12-15

Journal:JOURNAL OF ALLOYS AND COMPOUNDS

Included Journals:SCIE、EI

Volume:580

Page Number:592-597

ISSN No.:0925-8388

Key Words:LiMn2O4 rod; Solid-state reaction; Cathode materials; Aqueous electrolyte

Abstract:The aqueous lithium-ion batteries using LiMn2O4 as cathode materials are considered to be one of the most promising stationary power sources for large-scale energy storage devices. In the present work, LiMn2O4 rods were successfully synthesized by using hydrothermal reaction to produce beta-MnO2 rods as precursor followed by its solid-state lithiation. The influences of the solid-state reaction conditions on the final products were investigated and the electrochemical performances were tested in Li2SO4 aqueous electrolyte. The results show that LiMn2O4 rods can be obtained at 700 degrees C for 8 h (Sample A) and at 900 degrees C for 3 h (Sample B), respectively. Sample A exhibits superior electrochemical performances. The discharge capacities are 92.5, 92.9, 93.5 and 96.8 mAh g(-1) at 1000, 500, 200 and 100 mA g(-1), respectively. They are nearly constant between the high current density of 1000 and 200 mA g(-1), demonstrating its high rate capability. In addition, sample A exhibits good cycling performance with only a total capacity loss of 5.4% after 200 cycles. (c) 2013 Elsevier B.V. All rights reserved.