ELECTROLYTE, SECONDARY BATTERY, BATTERY MODULE, BATTERY PACK AND POWER CONSUMPTION APPARATUS

1 . An electrolyte, comprising:

a fluorinated metal salt with S═O or P═O; and

a titanate with a structural formula Ti—(O—R 1 ) 4 , wherein the R 1 is selected from one or more of C 1 -C 6 alkyl, C 1 -C 6 halogenated alkyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl or C 1 -C 6 silyl.

2 . The electrolyte according to claim 1 , wherein the fluorinated metal salt is selected from one or more of MSO 3 F and MPO 2 F 2 ; and M is a metal ion selected from the group consisting of Li, Na, K and Cs.

3 . The electrolyte according to claim 1 , wherein the fluorinated metal salt is selected from one or more of LiSO 3 F and LiPO 2 F 2 .

4 . The electrolyte according to claim 1 , wherein the titanate is selected from one or more Ti—[O—Si(CH 3 ) 3 ] 4 , Ti—[O—CH 2 CH 2 CH 3 ] 4 , Ti—[O—CH 2 CH 3 ] 4 , Ti—[O—CH 2 CH 2 CF 3 ] 4 and Ti—[O—CH 2 CH═CH 2 ] 4 .

5 . The electrolyte according to claim 1 , wherein a molar ratio of the titanate to the fluorinated metal salt is 2/1˜1/20.

6 . The electrolyte according to claim 1 , wherein the fluorinated metal salt accounts for 0.01%˜8% of an electrolyte quality; and the titanate accounts for 0.01%˜8% of the electrolyte quality.

7 . The electrolyte according to claim 1 , wherein a sum of the fluorinated metal salt and the titanate accounts for 0.01˜10% of the electrolyte quality.

8 . The electrolyte according to claim 1 , wherein the electrolyte further comprises a fluorinated solvent, and the fluorinated solvent is selected from one or more of fluorocarbonate, fluorobenzene and fluoroether; the fluorocarbonate is selected from at least one of

and/or, the fluorobenzene is

and/or, the fluoroether is

wherein R 2 , R 3 , R 4 and R 5 are each independently selected from C 1 -C 6 alkyl and C 1 -C 6 fluoroalkyl, R 6 and R 7 are each independently selected from C 1 -C 4 alkylene and C 1 -C 4 fluoroalkylene, and R 8 , R 9 , R 10 , R 11 , R 12 and R 13 are each independently selected from F or H.

9 . The electrolyte according to claim 1 , wherein the fluorocarbonate is selected from at least one of

and/or, the fluorobenzene is

and/or, the fluoroether is selected from at least one of

10 . The electrolyte according to claim 8 , wherein the fluorinated solvent accounts for 10˜70% of the electrolyte quality.

11 . A secondary battery, comprising:

the electrolyte according to claim 1 .

12 . The secondary battery according to claim 11 , wherein

the secondary battery comprises a positive electrode sheet and a negative electrode sheet, the positive electrode sheet comprises a positive electrode current collector and a positive electrode film layer provided on at least one surface of the positive electrode current collector, and the positive electrode film layer contains a vinylidene fluoride-alkyl unit-acrylate-acrylic acid copolymer (PVdF-Ac) as a binder.

13 . The secondary battery according to claim 12 , wherein

the binder has a structure of a general formula (I):

wherein m=60˜75%,

n=5%˜10%,

x=10%˜25%,

y=3˜5%,

R 1 ′, R 2 ′, R 3 ′ and R 4 ′ are each independently selected from hydrogen, substituted C 1 -C 8 alkyl, wherein a substituent is selected from at least one of F, Cl and Br.

R 5 ′, R 6 ′ and R 7 ′ are each independently selected from hydrogen, substituted C 1 -C 6 alkyl, wherein the substituent is selected from at least one of F, Cl and Br,

R 8 ′ is selected from optionally substituted C 1 -C 15 alkyl, wherein the substituent is selected from at least one of F, Cl and Br, and

R 9 ′, R 10 ′ and R 11 ′ are each independently selected from hydrogen, substituted C 1 -C 6 alkyl, wherein the substituent is selected from at least one of F, Cl and Br.

14 . The secondary battery according to claim 12 , wherein

the positive electrode film layer contains at least one positive electrode active material selected from the following: lithium manganese iron phosphate, lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide and a complex of the above compounds with other transition metal or non-transition metal.

15 . The secondary battery according to claim 12 , wherein

the negative electrode sheet comprises a negative electrode current collector and a negative electrode film layer provided on at least one surface of the negative electrode current collector, and the negative electrode film layer contains a compound with an epoxy group or an isocyanate group; when the negative electrode film layer contains a compound with the epoxy group, the compound with the epoxy group contains at least two epoxy groups, and when the negative electrode film layer contains a compound with the isocyanate group, the compound with the isocyanate group contains at least two isocyanate groups.

16 . The secondary battery according to claim 15 , wherein

the compound with the epoxy group is selected from one or more of bisphenol A diglycidyl ether, bisphenol F diglycidyl ether, bisphenol S diglycidyl ether, pentaerythritol glycidyl ether, 1,4-butanediol glycidyl ether, propylene glycol glycidyl ether, glycidyl phthalate, diglycidyl tetrahydrophthalate, diglycidyl hexahydrophthalate, 4,4′-diaminodiphenylmethane tetraglycidyl epoxy, triglycidyl-p-aminophenol, 1,3-bis (N,N-diglycidylaminomethyl) cyclohexane, tetraglycidyl-1,3-bis (aminomethylcyclohexane), 9,9-bis [(2,3-glycidoxy) phenyl]fluorene, 1,4-cyclohexanedimethanol diglycidyl ether, tetraglycidyl-4,4′-diaminodiphenyl ether and tetraglycidyl-3,4′-diaminodiphenyl ether;

and the compound with the isocyanate group is selected from one or more of toluene diisocyanate, diphenylmethane diisocyanate, 1,5-naphthalene diisocyanate, dimethyl biphenyl diisocyanate, hexamethylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, 2,4,4-trimethylhexamethylene diisocyanate, xylylene diisocyanate, tetramethyl xylylene diisocyanate, hydrogenated xylylene diisocyanate, isophor of erone diisocyanate, 4,4′-dicyclohexylmethane diisocyanate, 1,4-cyclohexane diisocyanate, methylcyclohexane diisocyanate, 1,4-phenylene diisocyanate and norbornane diisocyanate.

17 . A power consumption apparatus, comprising at least one of the secondary battery according to claim 11 .