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METHOD OF PRODUCING LITHIUM ION-STORING/RELEASING MATERIAL, LITHIUM ION-STORING/RELEASING MATERIAL, AND ELECTRODE STRUCTURE AND ENERGY STORAGE DEVICE USING THE MATERIAL

  • US 20090162750A1
  • Filed: 02/27/2009
  • Published: 06/25/2009
  • Est. Priority Date: 09/06/2007
  • Status: Abandoned Application
First Claim
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1. An electrode material for a negative electrode of an energy storage device capable of electrochemically storing and releasing lithium ions, the electrode material comprising silicon or tin primary particles composed of crystal particles each having a diameter of 5 nm to 200 nm and an amorphous surface layer having a thickness of 1 nm to 10 nm, whereinthe amorphous surface layer of each of the primary particles is formed of at least a metal oxide;

  • Gibbs free energy when the metal oxide is produced by oxidation of a metal is smaller than Gibbs free energy when silicon or tin is oxidized; and

    the metal oxide has higher thermodynamic stability than silicon oxide or tin oxide.

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