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Non-aqueous electrolyte secondary battery

  • US 9,093,704 B2
  • Filed: 11/19/2008
  • Issued: 07/28/2015
  • Est. Priority Date: 11/26/2007
  • Status: Active Grant
First Claim
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1. A non-aqueous electrolyte secondary battery comprisingan electrode plate group anda non-aqueous electrolyte,wherein said electrode plate group comprises:

  • a positive electrode;

    a negative electrode;

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

    a positive electrode lead connected to said positive electrode; and

    a negative electrode lead connected to said negative electrode,said negative electrode comprisesa negative electrode active material layer anda negative electrode current collector,said negative electrode active material layer comprises a material comprising at least one member selected from the group consisting of silicon and tin; and

    said negative electrode active material layer formed on said negative electrode current collector, andthe ratio of the cross-sectional area of said negative electrode lead relative to the volume of said negative electrode current collector is 1.0×

    10

    4
    to 7.0×

    10

    3
    (cm2/cm3),said electrode plate group has an energy density of not less than 750 Wh/L by volume, andat least one of said positive electrode lead and said negative electrode lead is in a strip form, and has a uniform width and a uniform cross-sectional area of 5.5×

    10

    5
    to 1.2×

    10

    2
    cm2, both in a longitudinal direction of the entire at least one of said positive electrode lead and said negative electrode lead.

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