Synthesis and Electrochemical Performance of LiMn 0.6Fe 0.4PO 4/C Cathode for Lithium-ion Batteries

【Author】

LI Wei;ZHANG Yuan-Jie;WANG Xuan-Peng;NIU Chao-Jiang;AN Qin-You;MAI Li-Qiang

【Institution】

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology;State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology;State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology;State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology;State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology;State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology

【Abstract】

The Li Mn 0.6Fe 0.4PO 4/C cathode for lithium-ion batteries (LIBs) was synthesized by solvothermal, ball-milling and solid phase calcination methods using sucrose as a carbon source and oxalic acid as an antioxidant. The final products with different morphologies were obtained by changing sintering temperatures. The structure and morphology of the target products were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). Cyclic voltammetry and galvanostatic charge and discharge tests were employed to characterize the electrochemical properties of the samples. The results manifest that well-crystallized olivine structure LiMn 0.6Fe 0.4PO 4/C nano-rods and nano-spindles with no obvious impurity phase are obtained. The spindle-like LiMn 0.6Fe 0.4PO 4/C sample S-650 (which was sintered at 650 °C) shows a highly monodisperse and homogeneous morphology. Electrochemical analysis results demonstrate that S-650 exhibits the best electrochemical performance with an initial discharge capacity of 119.1 mAh/g at the current density of 0.2 C (1 C = 170 mA/g), and a capacity of 148.8 mAh/g is achieved after 80 charge-discharge cycles, in comparison with S-600 (which was sintered at 600 °C) and S-700 (which was sintered at 700 °C). Meanwhile, S-650 also demonstrates excellent cycling stability even at a high current density of 2 C.

【Keywords】

lithium-ion batteries;LiMn 0.6Fe 0.4PO 4/C;cathode material;electrochemical performance

References

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Total: 29 articles

  • [1] WANG Tao,YIN Ye,LIU Hao-Wen(College of Chemistry and Materials Science,South-Central University for Nationalities,Wuhan 430074,China), Synthesis of FePO_4 from Fe_2O_3 and Its Application in Synthesizing Cathode Material LiFePO_4, Journal of Inorganic Materials,
  • [2] WANG Yan-Ming,WANG Fei,WANG Guang-Jian(School of Chemistry and Materials Science,Huaibei Normal University,Huaibei 235000,China), Sol-Gel Synthesis and Electrochemical Performance of LiMnPO_4/C Cathode Material, Journal of Inorganic Materials,
  • [3] SU Jing;WU Xing-Long;GUO Yu-Guo;CAS Key Laboratory of Molecular Nanostructure and Nanotechnology,Institute of Chemistry,Chinese Academy of Sciences;, Preparation and Electrochemical Properties of LiMn_(0.8)Fe_(0.2)PO_4/C Nanocomposite, Journal of Inorganic Materials,
  • [4] QIN Xian-Zhong;YANG Gai;GAO Jian;CAI Fei-Peng;TAN Chu-Hui;Key Laboratory of Biomass Gasification Technology, Energy Research Institute of Shandong Academy of Science;China Institute of Nuclear and New Energy Technology, Tsinghua University;, LiFePO_4/C Cathode Material Modified by Polyacrylamide, Journal of Inorganic Materials,

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