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Citation: LIU Hao-Wen, MAI Shuai, HU Yu-Mei, LIU Hui-Ling, ZHANG Ke-Li. Effects of Doped Metal Ions of Different Oxidation States on Electrochemical Performance of LiMn₂O₄[J]. Chinese Journal of Applied Chemistry, ;2007, 24(9): 1066-1070. shu

Effects of Doped Metal Ions of Different Oxidation States on Electrochemical Performance of LiMn₂O₄

1.
a College of Chemistry and Materials Science, South-central University for Nationalities, Wuhan 430074;Key Laboratory of Catalysis and Materials Science of Hubei Province;
2.
c College of Chemistry and Molecular Sciences, Wuhan University, Wuhan

Corresponding author: LIU Hao-Wen,
Received Date: 12 September 2006
Available Online: 20 December 2006

The metal ions of different oxidation states doped LiMn_1.95M_0.05O₄(M:Li,Mg,Co,Ti,V) samples were synthesized with CH₃COOLi·2H₂O、(CH₃CO₂2)₂Mn·4H₂O, oxide and citric acid as the starting material by rheolegical phase reaction method. The XRD results show that the samples exhibit the same phase as pure spinel. The data of the lattice parameter of LiMn_1.95M_0.05O₄ were calculated by winplotr.exe and the lattice parameter was smaller than that of the undoped one, which was decreased to some extent due to the doped-ion. The studies of the cyclic voltammetry showed two reversible processes, which are corresponding to the typical response of spinel LiMn₂O₄ and revealed that the insertion-extraction reaction occurred at two stages in the 4 V region. The doped ions had impact on the position and the area of the peaks. The lower the content of Mn(Ⅲ), the smaller the area of the peak. The higher the bond energy of the metal ion with oxygen, the higher the voltage of the peak. The electrochemical performances of the samples after 50 cycles of charge-discharge were studied and the results show that LiMn_1.95M_0.05O₄ displays a better capacity and cyclability at the same content of the doped ions.
- Li-ion battery,
- spinel,
- oxidation states,
- doped
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Effects of Doped Metal Ions of Different Oxidation States on Electrochemical Performance of LiMn₂O₄