Nonaqueous electrolyte secondary battery

Nonaqueous electrolyte secondary battery

  • CN 107,851,832 B
  • Filed: 07/09/2015
  • Issued: 06/09/2020
  • Est. Priority Date: 07/09/2015
  • Status: Active Grant
First Claim
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1. A nonaqueous electrolyte secondary battery having a power generating element, the power generating element comprising:

  • a positive electrode in which a positive electrode active material layer containing a positive electrode active material is formed on the surface of a positive electrode current collector;

    a negative electrode in which a negative electrode active material layer containing a negative electrode active material is formed on a surface of a negative electrode current collector; and

    the number of the first and second groups,a separator containing an electrolyte;

    the electrolyte contains an electrolyte salt, a nonaqueous solvent capable of dissolving the electrolyte salt, a 1 st additive and a 2 nd additive having a reduction potential lower than that of the 1 st additive,in this case, the 1 st additive is methylene methanedisulfonate,and, the 2 nd additive is vinylene carbonate and/or fluoroethylene carbonate,the BET specific surface area of the negative electrode active material is SSA, wherein SSA is m2A liquid coefficient L representing a ratio of an electrolytic mass to a total pore volume of the positive electrode, the negative electrode and the separator, A representing a ratio of an additive amount of the 1 st additive to a total amount of the nonaqueous solvent and the electrolyte salt in the electrolyte, B representing a ratio of an additive amount of the 2 nd additive to a total amount of the nonaqueous solvent and the electrolyte salt in mass%, and B representing a ratio of a total amount of the nonaqueous solvent and the electrolyte salt in mass%, satisfy0.21-0.69 of A multiplied by L/SSA and 0.51-1.5 of B multiplied by L/SSA,the concentration of the No. 1 additive in the electrolyte is 0.3-2% by mass based on 100% by mass of the electrolyte,the concentration of the 2 nd additive in the electrolyte is 0.1 to 4% by mass based on 100% by mass of the electrolyte.

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