Non-aqueous electrolyte and electrochemical device comprising the same
View Patent ↗Disclosed is a non-aqueous electrolyte comprising: an acrylate compound; a sulfinyl group-containing compound; an organic solvent; and an electrolyte salt. Also, disclosed is an electrode comprising a coating layer formed partially or totally on a surface thereof, the coating layer comprising: (i) a reduced form of an acrylate compound; and (ii) a reduced form of a sulfinyl group-containing compound. Further, disclosed is an electrochemical device comprising a cathode, an anode and a non-aqueous electrolyte, wherein (i) the non-aqueous electrolyte is the aforementioned non-aqueous electrolyte; and/or (ii) the cathode and/or the anode is the aforementioned electrode.
1. An electrochemical device comprising a cathode, an anode and a non-aqueous electrolyte solution, wherein:
(i) the non-aqueous electrolyte solution comprises:
(A) a mixture of compounds suitable for producing a solid electrolyte interface (SEI) layer on an electrode, the compounds consisting essentially of:
(1) an acrylate compound; and
(2) a sulfinyl group-containing compound;
(B) an organic solvent, and;
(C) an electrolyte salt; and/or
(ii) the cathode and/or the anode comprises a SEI layer formed partially or totally on a surface thereof, the SEI layer consisting essentially of:
(D) a reduced form of the acrylate compound; and
(E) a reduced form of the sulfinyl group-containing compound.
2. The electrochemical device as claimed in claim 1 , which is a lithium secondary battery.
3. The electrochemical device as claimed in claim 1 , wherein the acrylate compound is selected from the group consisting of tetraethyleneglycol diacrylate, polyethyleneglycol diacrylate (molecular weight 50˜20,000), bisphenol A ethoxylated diacrylate (molecular weight 100˜10,000), 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, trimethylolpropane triacrylate, trimethylolpropane ethyoxylate triacrylate, trimethylolpropane propoxylate triacrylate, ditrimethylolpropane tetraacrylate, pentaerythritol tetraacrylate, pentaerythritol ethoxylate tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, and tris[2-(acryloyloxy)ethyl]isocyanurate.
4. The electrochemical device as claimed in claim 1 , wherein the sulfinyl group-containing compound is selected from the group consisting of sulfites, sulfonates and sultones.