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Lithium ion secondary battery

  • US 5,882,821 A
  • Filed: 02/24/1997
  • Issued: 03/16/1999
  • Est. Priority Date: 02/23/1996
  • Status: Expired due to Fees
First Claim
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1. A process for preparing a lithium ion secondary battery which comprises electrically charging a non-aqueous secondary battery precursor comprising a positive electrode active material precursor of the formula (II):

  • 
    
    space="preserve" listing-type="equation">Li.sub.l+x Mn.sub.2-a M.sub.a/c O.sub.4+b (II)wherein M is a cation of a transition metal selected from the group consisting of Co, Ni, Fe, Cr, Cu, Ti, Zr, Nb and Y;

    x, a and b are numbers satisfying the conditions of 0.3<

    x<

    1.2, 0<

    a≦

    1.0, and 0≦

    b<

    0.4, respectively; and

    c is a number of 1 to 4, a negative electrode active material precursor, a non-aqueous electrolyte, and a container sealing the electrode precursors and electrolyte therein, to convert the positive electrode active material precursor into a positive electrode active material of the formula (I);

    
    
    space="preserve" listing-type="equation">Li.sub.y Mn.sub.2-a M.sub.a/c O.sub.4+b (I)wherein M, a, b and c are the same as above, and y is a number satisfying the condition of 0<

    y≦

    1.0, and the negative electrode active material precursor into a negative electrode active material having a lithium ion inserted therein.

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