Lithium ion secondary battery containing a negative electrode material layer containing Si and O as constituent elements

  • US 9,673,446 B2
  • Filed: 02/28/2012
  • Issued: 06/06/2017
  • Est. Priority Date: 02/28/2012
  • Status: Active Grant
First Claim
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1. A lithium ion secondary battery comprising a positive electrode having a positive electrode material mixture layer, a negative electrode, a separator and a nonaqueous electrolyte containing at least an electrolyte salt and an organic solvent,wherein the negative electrode has a negative electrode material mixture layer that comprises as a negative electrode active material a composite of a material containing Si and O as constituent elements and a carbon material,wherein an atomic ratio x of O to Si is 0.5≦

  • x≦

    1.5,the nonaqueous electrolyte contains the electrolyte salt at a concentration of higher than 1.2 mol/L and has a conductivity at 25°

    C. of 6.5 to 12.2 mS/cm,a relationship of A/B≧

    4 is satisfied when A (mA) indicates a current value for discharging a capacity of the lithium ion secondary battery in an hour and B (cm2) indicates an opposed area between the positive electrode material mixture layer and the negative electrode material mixture layer, andthe nonaqueous electrolyte further contains 4-fluoro-1,3-dioxolan-2-one as halogen-substituted cyclic carbonate, and at least one selected from dimethyl carbonate and diethyl carbonate as chain carbonate.

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