A kind of non-aqueous electrolyte for lithium ion cell and the battery made thereof

A kind of non-aqueous electrolyte for lithium ion cell and the battery made thereof

  • CN 102,306,838 B
  • Filed: 08/17/2011
  • Issued: 04/13/2016
  • Est. Priority Date: 08/17/2011
  • Status: Active Grant
First Claim
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1. a non-aqueous electrolyte for lithium ion cell, is characterized in that, the fluorine ether that this electrolyte is shown below by cyclic carboxylic esters, cyclic sulfite, electrolytic salt, additive, structural formula and fluorocarbon surfactant form,R f1-O-R f2

  • Wherein;

    R f1to be carbon number be 3 ~ 4 containing fluoroalkyl, R f2to be carbon number be 2 ~ 5 containing fluoroalkyl;

    Described fluorine ether mass percent is in the electrolytic solution 10 ~ 50%;

    Described cyclic sulfite mass percent is in the electrolytic solution 10% or 20%;

    Described fluorocarbon surfactant structural formula as shown in the formula,R f3x (CH 2cH 2o) nr 1or R f3x (CHCH 3cH 2o) nr 1, Wherein, R f3to be carbon number be 2 ~ 18 containing fluoroalkyl, X is sulphur (-S-) functional group, R 1to be hydrogen atom or carbon number be 1 ~ 4 alkyl, n=1 ~ 25;

    Described electrolytic salt at least comprises LiPF 6, LiBF 4, LiClO 4, LiBOB, LiODFB, LiN (SO 2cF 3) 2, LiN (SO 2c 2f 5) 2, LiN (SO 2f) 2in one, and concentration in the electrolytic solution counts 0.6 ~ 2mol/L by lithium ion;

    Described additive is vinylene carbonate, fluorinated ethylene carbonate, vinylethylene carbonate, one or more in PS, and each additive mass percent is in the electrolytic solution 0.1 ~ 10%.

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