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

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    • Keywords

       

      Lithium ion batteries; polyaniline; LiMn1.95Al0.05O4; percolation theory; electrochemical performances.

    • Abstract

       

      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.

    • Author Affiliations

       

      Chang-Ling Fan1 Hari Om2 Ke-He Zhang1 Shao-Chang Han1

      1. College of Materials Science and Engineering, Hunan University, Changsha 410082, P. R. China
      2. Department of Materials Science and Engineering, Indian Institute of Technology, Kanpur 208 016, India
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