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Electrochemical performance of LiFe1-xMnxPO4/C materials prepared by ball milling

journal contribution
posted on 01.07.2014, 00:00 authored by Y P Huang, Z Chen, Y Wu, C J Kuang, Ying (Ian) ChenYing (Ian) Chen, S X Zhou
LiFe1-xMnxPO4/C composite materials as cathode materials in Li-ion batteries have been synthesised and their electrochemical properties have been investigated. The samples were synthesised by using high energy ball milling of commercially available precursors (Li2C2O4, FeC2O4.2H2O, MnC2O4.2H2O, NH4H2PO4) and then heated at 600°C. The morphology and structure of the heated samples were analysed by means of SEM and X-ray diffraction. The olivine structure of the LiFe1-xMnxPO4/C composite was obtained. A slight shift of the peaks to smaller 2θ angles with the increasing Mn/Fe ratios is observed due to the increase in lattice parameters. The influence of different Mn/Fe ratios on electrical and electrochemical performances were studied by charge-discharge and cyclic voltammetry (CV) testing. The CV curves of the pure LiFePO4 and LiMnPO4 show the expected Fe2+/Fe3+ peak around 3·5 V and Mn2+/Mn3+ peak around 4·1 V, respectively. The addition of manganese increases the discharge voltage from 3·5 to 4·1 V.

History

Journal

Materials Research Innovations

Volume

18

Pagination

46 - 49

Publisher

Maney Publishing

Location

Leeds, United Kingdom

ISSN

1432-8917

eISSN

1433-075X

Language

eng

Publication classification

C Journal article; C1 Refereed article in a scholarly journal

Copyright notice

2014, Maney Publishing