Improved electrochemical performance of LiFe0.65Mn0.35PO4 cathode material by using electrolytic manganese dioxide for lithium-ion battery

The olivine-type structure LiFe 0.65 Mn 0.35 PO 4 materials are respectively synthesized via MnO 2 and MnC 2 O 4 ·2H 2 O as manganese resources by using solid-state reaction. The compound materials are characterized by scanning electron microscopies (SEM), transmission electron microscopy (TEM), X-r...

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Bibliographic Details
Published in:Science China. Technological sciences 2017-12, Vol.60 (12), p.1853-1860
Main Authors: Zhou, HuangKai, Lu, JinHua, Huang, XiaoPeng, Du, YuanChao, Liang, Feng, Yao, YaoChun
Format: Article
Language:English
Subjects:
Cathodes
Cations
Chemical synthesis
Crystal structure
Electrochemical analysis
Electrode materials
Engineering
Lithium-ion batteries
Manganese dioxide
Olivine
Rechargeable batteries
Scanning electron microscopy
Transmission electron microscopy
X ray photoelectron spectroscopy
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Summary:The olivine-type structure LiFe 0.65 Mn 0.35 PO 4 materials are respectively synthesized via MnO 2 and MnC 2 O 4 ·2H 2 O as manganese resources by using solid-state reaction. The compound materials are characterized by scanning electron microscopies (SEM), transmission electron microscopy (TEM), X-ray photoelectronspectroscopy (XPS) and electrochemical test. The experimental results demonstrate that LiFe 0.65 Mn 0.35 PO 4 prepared by MnO 2 as manganese resource exhibits uniform particles with porous structure in SEM and TEM images. XPS data show the coexistence of Mn 4+ , Mn 3+ and Mn 2+ cations. Besides, this sample shows better discharge special capacity of 107.46 mA h g –1 at 5 C and capacitance conservation rate about 95.47% after 100 cycles at 1 C. The superior electrochemical capability is attributed to the coexistence of mixed-valence manganese cations in crystal and the uniform particles with porous structure.
ISSN:1674-7321
1869-1900
DOI:10.1007/s11431-017-9153-x