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Citation: SU Zhi, LIU Cong, XU Mao-Wen. Synthesis and Electrochemical Properties of Monoclinic Layered LiY_xMn_1-xO₂ as Cathode Material for Lithium-ion Batteries[J]. Chinese Journal of Applied Chemistry, ;2010, 27(2): 220-226. doi: 10.3724/SP.J.1095.2010.90106 shu

Synthesis and Electrochemical Properties of Monoclinic Layered LiY_xMn_1-xO₂ as Cathode Material for Lithium-ion Batteries

College of Life and Chemistry Science, Xinjiang Normal University, Urumqi, 830054

Received Date: 18 February 2009
Revised Date: 11 June 2009

A series of yttrium(Ⅲ) ion doped layered lithium manganese oxides LiY_xMn_1-xO₂(x:0.01,0.02,0.03 and 0.05) compounds was synthesized with Na₂CO₃,(CH₃COO)₂ Mn·4H₂O, CH₃COOLi·2H₂O and Y₂O₃ as the starting materials by means of two-step high temperautre solid state reaction and hydrothermal ion exchange method. The Y³⁺-doping effect on the structure and the electrochemical performances of the samples were investigated by XRD,XPS,cyclic voltammetry and charge-discharge tests. The XRD results show that the samples exhibit the same phase as pure monoclinic layered sturcture. Electrochemical performances indicate that the yttrium ions can partially replace Mn³⁺ in monoclinic structure LiMnO₂ materials. Because the radius of Y³⁺ is bigger than that of Mn³⁺,samples doped with yittrium elements have larger lattice constant compared with that of undoped sample. Doping enables lithium ions to transport more freely in the three dimensional pathway,and all yittrium element doped materials show good cycle stability. Experiments of doping ratio and electrochemistry performance were carried out. The compound LiY_0.021Mn0.979O₂ obtained exhibited a better performance whose initial discharge specific capacity reached 123.4 mA·h/g respectively. After 100 cycles,the discharge capacity maintained 212.1 mA·h/g,which is much higher than the discharge capacity 138 mA·h/g of the undoped monoclinic structure LiMnO₂ materials. AC analysis shows lower electrochemical impedance and the diffusibility of lithium ions is clearly improved due to Y³⁺ doping.
- monoclinic LiMnO₂,
- lithium-ion battery,
- cathode material,
- yttrium doping,
- electrochemical property
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Synthesis and Electrochemical Properties of Monoclinic Layered LiYxMn1-xO2 as Cathode Material for Lithium-ion Batteries

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Synthesis and Electrochemical Properties of Monoclinic Layered LiY_xMn_1-xO₂ as Cathode Material for Lithium-ion Batteries