Lithium secondary battery

  • US 5,686,138 A
  • Filed: 01/24/1994
  • Issued: 11/11/1997
  • Est. Priority Date: 11/12/1991
  • Status: Expired due to Term
First Claim
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1. A lithium secondary battery comprising:

  • a negative electrode composed mainly of a carbon material consisting essentially of a graphite having(a) a d-value of the lattice plane (002) obtained by X-ray diffraction thereof of 3,354 to 3,370 and(b) a crystallite size in the c-axis direction obtained by X-ray diffraction thereof of at least 200 Å

    ;

    a positive electrode composed mainly of a compound capable of occluding and discharging lithium and which is different from the graphite of the negative electrode;

    a separator between said positive electrode and said negative electrode; and

    an electrolyte solution of an electrolyte solute dissolved in a solvent, said solvent comprising ethylene carbonate in an amount of 20% to 80% by volume based on the volume of the solvent.

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