SECONDARY BATTERY AND BATTERY MODULE, BATTERY PACK, AND ELECTRIC APPARATUS INCLUDING SAME
This application relates to a secondary battery including an electrolyte and a positive electrode plate, where the electrolyte may include a compound represented by formula (I): The positive electrode plate may include a positive electrode active material, where a surface residual lithium content of the positive electrode active material may be 20 ppm to 2,000 ppm.
1 . A secondary battery comprising an electrolyte and a positive electrode plate, wherein the electrolyte comprises a compound represented by formula (I):
wherein
Q represents S or P;
L represents a single bond, an oxo group, or any one or a combination of C 1-6 alkylidene group, C 1-6 alkoxy group, C 2-6 alkenylene group, C 2-6 alkenoxy group, C 6-12 aryl group, C 6-12 aryloxy group, and C 1-6 alkylidene-prop-2-enyl which are unsubstituted or mono- or polysubstituted by a same or different substituent groups, in each case the substituent group being selected from C 1-6 alkyl group, C 2-6 alkenyl group, C 2-6 alkynyl group, halogen, or cyano group;
when Q is S, m is 2 and n is 1;
when Q is P, m is 1 and n is 2; and
the positive electrode plate comprises a positive electrode active material, wherein a surface residual lithium content of the positive electrode active material is 20 wt ppm to 2,000 wt ppm.
2 . The secondary battery according to claim 1 , wherein the surface residual lithium content of the positive electrode active material is 20 wt ppm to 1,500 wt ppm.
3 . The secondary battery according to claim 1 , wherein L represents a single bond, an oxo group, or any one or a combination of C 1-4 alkylidene group, C 1-4 alkoxy group, C 2-4 alkenylene group, C 2-4 alkenoxy group, C 6 aryl group, C 6 aryloxy group, and C 1-4 alkylidene-prop-2-enyl which are unsubstituted or mono- or polysubstituted by a same or different substituent groups, in each case the substituent group being selected from C 1-4 alkyl group, C 2-4 alkenyl group, C 2-4 alkynyl group, halogen, or cyano group.
4 . The secondary battery according to claim 1 , wherein the compound represented by general formula (I) is selected from at least one of the following:
5 . The secondary battery according to claim 1 , based on total weight of the electrolyte, wherein a percentage of the compound represented by formula (I) in the electrolyte is 0.01 wt % to 25 wt %.
6 . The secondary battery according to claim 1 , wherein the electrolyte further comprises one or more positive electrode film-forming additives selected from: vinylene sulfate, polycyclic sulfate, lithium difluorophosphate, and lithium fluorosulfonate.
7 . A battery module, comprising the secondary battery according to claim 1 .
8 . A battery pack, comprising the battery module according to claim 7 .
9 . An electric apparatus, comprising the battery pack according to claim 8 .