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Bismuth phosphate: A novel cathode material based on conversion reaction for lithium-ion batteries

Journal of Alloys and Compounds, ISSN: 0925-8388, Vol: 579, Page: 18-26
2013
  • 29
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  • 34
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Metrics Details

  • Citations
    29
    • Citation Indexes
      29
  • Captures
    34

Article Description

Here, we provide a new scientific insight in the field of lithium-ion batteries, in which BiPO 4 is initially reported as a cathode material based on conversion reaction. BiPO 4 exists in three polymorphic phases, which have been synthesized using a room-temperature liquid precipitation route followed by heating treatment. The effects of phase transformation on electrochemical performances of BiPO 4 have been investigated. Herein the hexagonal BiPO 4 exhibits the best reversibility, rate capability and cycling stability. A conversion reaction has also been proved to occur in BiPO 4 with reduction of BiPO 4 into a metallic Bi 0 phase and a Li 3 PO 4 phase upon lithiation, and the reformation of BiPO 4 phase during next charge process. Its theoretical specific capacity and theoretical output voltage are 264.5 mA h g −1 and ∼3.14 V, respectively. Especially, its theoretical volumetric energy density is as high as 5253.1 Wh L −1, close to twice higher than LiCoO 2. Therefore, it is still worthy of further study for lithium-ion batteries.

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