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Rechargeable lithium battery having improved reversible capacity

  • US 5,721,067 A
  • Filed: 02/22/1996
  • Issued: 02/24/1998
  • Est. Priority Date: 02/22/1996
  • Status: Expired due to Term
First Claim
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1. In an improved rechargeable lithium battery, said rechargeable lithium battery having a positive electrode containing a transition metal compound capable of incorporating lithium ions in its structure as the positive active material, a negative electrode containing carbonaceous particles capable of intercalating lithium ions as the negative active material, a non-aqueous electrolyte conductive of lithium ions, and a total amount of lithium ions distributed between the electrodes and the non-aqueous lithium ion bearing electrolyte, said rechargeable lithium battery having a capacity measured in milliampere-hours per gram weight of battery(mAh/gt), an anode specific reversible capacity (mAh/ga) and a cathode specific reversible capacity (mAh/gc), the improvement comprising that the weight of the negative active material in said negative electrode (wa) and the weight of the positive active material in said positive electrode (wc) are adjusted such that the value of the ratio, denoted by n, of said anode specific reversible capacity multiplied by said weight of the negative active material contained in said rechargeable lithium battery, to said cathode specific reversible capacity multiplied by said weight of the positive active material contained in said rechargeable lithium ion battery, is expressed as mAh/ga ×

  • wa ;

    mAh/gc ×

    wc =0.85<

    n<

    1.15, and that the weight of the negative active material in the negative electrode (wa) is adjusted by introducing a portion of said total amount of lithium ions in said rechargeable lithium battery in an assembled state prior to packaging and sealing said battery;

    thereby providing a rechargeable lithium battery having an energy density of at least 320 watt.hour/liter.

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