NON-AQUEOUS ELECTROLYTE AND SECONDARY BATTERY, BATTERY MODULE, BATTERY PACK AND ELECTRICAL DEVICE CONTAINING THE SAME
A secondary battery includes a positive electrode plate and a non-aqueous electrolyte. The non-aqueous electrolyte includes a compound shown in Formula 1. Based on a total mass of the non-aqueous electrolyte, the compound shown in Formula 1 is present in an amount of A1% by mass. The positive electrode collector has a thickness of H μm. The positive active material layer has an elongation at break of Q %. the positive active material layer has a compaction density of P g/cm 3 . The secondary battery satisfies: H is from 4 to 14, A1/H is from 0.0015 to 0.20, Q+/A1 is from 1 to 4, and P/A1 is from 2 to 340.
1 . A secondary battery comprising:
a positive electrode plate; and
a non-aqueous electrolyte;
wherein:
the positive electrode plate comprises a positive electrode collector and a positive active material layer disposed on at least one surface of the positive electrode collector;
the non-aqueous electrolyte comprises a compound shown in Formula 1, in which X and Y each independently represent a fluorine atom, or partially fluorinated or perfluorinated group selected from C1-C10 alkyl group, C2-C10 alkenyl group, C2-C10 alkynyl group, C6-C8 aryl group, C1-C10 alkoxy group, C2-C10 alkenoxy group, C2-C10 alkynloxy group, and C6-C8 aryloxy group, and at least one of X and Y represents a fluorine atom;
based on a total mass of the non-aqueous electrolyte, the compound shown in Formula 1 is present in an amount of A1% by mass, the positive electrode collector has a thickness of H m, the positive active material layer has an elongation at break of Q %, the positive active material layer has a compaction density of P g/cm 3 , and the secondary battery satisfies: H is from 4 to 14, A1/H is from 0.0015 to 0.20, Q+A1 is from 1 to 4, and P/A1 is from 2 to 340.
2 . The secondary battery according to claim 1 , wherein:
A1/H is from 0.002 to 0.05; and/or
Q+A1 is from 1.5 to 3.5; and/or
P/A1 is from 5 to 340.
3 . The secondary battery according to claim 1 , wherein:
A1 is from 0.02 to 1.8; and/or
Q is from 0.5 to 3.5; and/or
P is from 3.2 to 3.7.
4 . The secondary battery according to claim 1 , wherein the non-aqueous electrolyte further comprises a first lithium salt comprising lithium hexafluorophosphate.
5 . The secondary battery according to claim 1 , wherein the non-aqueous electrolyte further comprises a first lithium salt comprising a combination of lithium hexafluorophosphate and lithium bis(fluorosulfonyl)imide.
6 . The secondary battery according to claim 1 , wherein the non-aqueous electrolyte further comprises a second lithium salt comprising at least one of lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium difluorophosphate, lithium difluorodioxalate phosphate, and lithium tetrafluoroxalate phosphate.
7 . The secondary battery according to claim 6 , wherein the second lithium salt comprises lithium difluorophosphate.
8 . The secondary battery according to claim 1 , wherein the non-aqueous electrolyte further comprises a cyclic carbonate compound.
9 . The secondary battery according to claim 8 , wherein the cyclic carbonate compound comprises at least one of ethylene carbonate, propylene carbonate, vinylene carbonate, and vinyl ethylene carbonate.
10 . The secondary battery according to claim 1 , wherein the non-aqueous electrolyte further comprises fluoroethylene carbonate.
11 . The secondary battery according to claim 1 , wherein the non-aqueous electrolyte further comprises a moisture scavenger comprising at least one of hexamethyldisilazane and tris(trimethylsilyl)phosphate.
12 . The secondary battery according to claim 1 , wherein X and Y satisfy one of following conditions (1) to (3):
(1) both X and Y represent a fluorine atom;
(2) one of X and Y represents a fluorine atom and the other represents at least one selected from the group consisting of partially fluorinated or perfluorinated groups of: C1-C5 alkyl, C2-C5 alkenyl, C2-C5 alkynyl, phenyl, phenoxy, C1-C5 alkoxy, C2-C5 alkenoxy and C2-C5 alkynyloxy; and
(3) one of X and Y represents a fluorine atom and the other represents at least one selected from the group consisting of partially fluorinated or perfluorinated groups of: methyl, ethyl, n-propyl, isopropyl, n-butyl, tert-butyl, vinyl, propyl, allyl, butadienyl, ethynyl, propynyl, phenyl, methoxy, ethoxy, propoxy, ethylenoxy, propenyloxy, ethynyloxy, propynyloxy, and phenoxy.
13 . The secondary battery according to claim 1 , wherein the compound shown in Formula 1 comprises at least one of following compounds:
14 . The secondary battery according to claim 1 , wherein:
the positive electrode collector is made of aluminum foil or aluminum alloy foil.
15 . A battery module comprising the secondary battery according to claim 1 .
16 . A battery pack, comprising the secondary battery according to claim 1 .
17 . An electrical device comprising the secondary battery according to claim 1 .