• Chang-Ling Fan

      Articles written in Bulletin of Materials Science

    • Preparation and electrochemical properties of LiFePO4/C composite cathodes for lithium-ion batteries

      Han Chen Shao-Chang Han Wen-Zhi Yu Hong-Zhi Bo Chang-Ling Fan Zhong-Yu Xu

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      Three kinds of LiFePO4/C composites for lithium-ion batteries were prepared by solid-state reaction. The crystalline structure, morphology and specific surface area of the composites were investigated by X-ray diffraction, scanning electron microscopy and multi-point Brunauer, Emmett and Teller. The results showed that the samples were all well-ordered olivine structures. A network structure, LiFePO4/C composite, was obtained using phenolic resin as carbon source. It possessed the highest specific surface area of 115.65 m2/g, exhibited the highest discharge capacity of 164.89 and 149.12 mAh/g at 0.1 C and 1 C rates, respectively. The discharge capacity was completely recovered when 0.1 C rate was applied again.

    • Influence of conductive electroactive polymer polyaniline on electrochemical performance of LiMn1.95Al0.05O4 cathode for lithium ion batteries

      Chang-Ling Fan Hari Om Ke-He Zhang Shao-Chang Han

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      Conductive electroactive polymer polyaniline is utilized to substitute conductive additive acetylene black in the LiMn1.95Al0.05O4 cathode for lithium ion batteries. Results show that LiMn1.95Al0.05O4 possesses stable structure and good performance. Percolation theory is used to optimize the content of conductive additive in cathode. It shows that the conductivity of cathode reaches its maximum value when the content of conductive additives is 15 wt%. This is in agreement with the results of charge and discharge experiments. The application of polyaniline can evidently enhance the electrochemical performance of cathode. The discharge capacity of cathode using 15 wt% polyaniline is 95.9 mAh g-1 at the current density of 170 mA g-1. The charge transfer resistance under different depths of discharge of cathode is much lower compared with the use of acetylene black. It can be concluded that the application of polyaniline in cathode can greatly improve the electrochemical performances of LiMn1.95Al0.05O4 cathode.

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    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

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      Posted on July 25, 2019

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