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Battery materials for ultrafast charging and discharging

Author

Listed:
  • Byoungwoo Kang

    (Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA)

  • Gerbrand Ceder

    (Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA)

Abstract

High-speed batteries Batteries are thought of as having high energy density but low power rates, while for fast-discharging supercapacitors the opposite is true. Byoungwoo Kang and Gerbrand Ceder have now developed a lithium-ion battery that challenges that assumption, discharging extremely rapidly and maintaining a power density similar to a supercapacitor, two orders of magnitude higher than a normal lithium-ion battery. This is achieved by modifying LiFePO4, a material widely used in batteries. The starting point is nanosized LiFePO4, which already gives relatively fast discharge rates, which is then coated with a similar compound that is slightly Fe,P,O-deficient. On heating, the coating forms a glassy top layer that enhances lithium-ion mobility. The performance of batteries based on this technology could lead to new applications for electrochemical energy storage.

Suggested Citation

  • Byoungwoo Kang & Gerbrand Ceder, 2009. "Battery materials for ultrafast charging and discharging," Nature, Nature, vol. 458(7235), pages 190-193, March.
    • Handle: RePEc:nat:nature:v:458:y:2009:i:7235:d:10.1038_nature07853
    DOI: 10.1038/nature07853
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