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Lithium secondary battery

  • US 20090087731A1
  • Filed: 09/25/2008
  • Published: 04/02/2009
  • Est. Priority Date: 09/27/2007
  • Status: Abandoned Application
First Claim
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1. A lithium secondary battery comprising:

  • a battery case;

    a non-aqueous electrolyte; and

    an electrode assembly accommodated in the battery case, the electrode assembly comprising a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, the positive electrode and the negative electrode being disposed facing each other across the separator and being wound; and

    the negative electrode comprising a negative electrode current collector and a negative electrode active material layer disposed on the negative electrode current collector, the negative electrode active material layer comprising a negative electrode binder and a negative electrode active material containing particles of silicon and/or a silicon alloy; and

    the positive electrode comprising a positive electrode current collector and a positive electrode active material layer disposed on the positive electrode current collector, the positive electrode active material layer comprising a positive electrode binder and a positive electrode active material containing a layered lithium-transition metal composite oxide, wherein Al2O3 particles are adhered to a surface of the lithium-transition metal composite oxide so that a BET specific surface area of the positive electrode active material after the adherence of the Al2O3 particles is from 1.5 times to 8 times greater than that before the adherence of the Al2O3 particles.

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