Secondary battery, battery module, battery pack and power consuming device

1. A secondary battery, comprising

a positive electrode plate and an electrolyte solution;

wherein:

the positive electrode plate comprises a positive current collector and a positive electrode film provided on at least one surface of the positive current collector, wherein the positive electrode film comprises a positive electrode active material and a lithium supplement, and the lithium supplement includes at least one of substances represented by formula (I) below,

m Li x1 O· n (Ni y1 Mn y2 Co y3 Cu y4 Fe y5 )O  (I)

where:

1≤x1≤2;

0≤y1≤1; 0≤y2≤1; 0≤y3≤1; 0≤y4≤2; 0≤y5≤1;

0.5≤y1+y2+y3+y4+y5≤1; and

1≤m≤3; 0≤n/m≤1;

the positive electrode film and/or the electrolyte solution includes one or more nitrone derivatives as an additive, a molecule of each of the one or more nitrone derivatives comprising a structure represented by formula (II) below:

and

a molar content N1 of the lithium supplement and a molar content N2 of the additive satisfy: 0.1≤N2/(N1×m×x1)≤0.5.

2. The secondary battery according to claim 1 , wherein the lithium supplement comprises at least one of Li 2 O, Li 2 O 2 , Li 2 FeO 4 , or Li 2 Cu 0.5 Ni 0.5 O 2 .

3. The secondary battery according to claim 1 , wherein:

each of the one or more nitrone derivatives comprises a compound represented by formula (II′) below, and/or cyclic nitrone derivatives with 4-8 membered rings,

in formula (II′), R 1 and R 2 are each independently at least one selected from methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, fluoromethyl, fluoroethyl, fluoropropyl, methylhydroxy, ethylhydroxy, phenyl, tolyl, fluorophenyl, methoxy, ethoxy, 1,1-dimethyl-ethanol group, 1,1-dimethyl-propanol group, 1,1-dimethyl-butanol group, 1-methyl-propanol group, and tert-butyl triol group.

4. The secondary battery according to claim 1 , wherein the additive comprises at least one of N-tert-butyl-α-phenylnitrone, N-tert-butyl-α-4-fluorophenylnitrone, or 5,5-dimethyl-1-pyrroline oxide.

5. The secondary battery according to claim 1 , wherein a volume average particle size Dv50 of the lithium supplement is greater than a volume average particle size Dv50 of the positive electrode active material.

6. The secondary battery according to claim 1 , wherein a volume average particle size Dv50 of the lithium supplement is 5 μm-15 μm.

7. The secondary battery according to claim 1 , wherein a specific surface area of the lithium supplement is in a range of 0.5 m 2 /g-20 m 2 /g.

8. The secondary battery according to claim 1 , wherein a purity of the lithium supplement is greater than or equal to 90%.

9. The secondary battery according to claim 1 , wherein a first delithiation capacity of the lithium supplement is in a range of 300-1500 mAh/g.

10. The secondary battery according to claim 1 , wherein a first charge/discharge voltage range of the lithium supplement is 2.0 V-4.5 V.

11. The secondary battery according to claim 1 , wherein the electrolyte solution further comprises dimethyl carbonate.

12. The secondary battery according to claim 11 , wherein a content of the dimethyl carbonate in the electrolyte solution is 20 mass %-80 mass %.

13. The secondary battery according to claim 11 , wherein a content of the dimethyl carbonate in the electrolyte solution is 60 mass %-70 mass %.

14. The secondary battery according to claim 1 , wherein the positive electrode active material comprises a lithium-containing phosphate.

15. A power consuming device comprising the secondary battery according to claim 1 .

16. A secondary battery, comprising

a positive electrode plate and an electrolyte solution;

wherein:

the positive electrode plate comprises a positive current collector and a positive electrode film provided on at least one surface of the positive current collector, wherein the positive electrode film comprises a positive electrode active material and a lithium supplement, and the lithium supplement includes at least one of substances represented by formula (I) below,

m Li x1 O· n (Ni y1 Mn y2 Co y3 Cu y4 Fe y5 )O  (I)

where:

1≤x1≤2;

0≤y1≤1; 0≤y2≤1; 0≤y3≤1; 0≤y4≤2; 0≤y5≤1;

0.5≤y1+y2+y3+y4+y5≤1; and

1≤m≤3; 0≤n/m≤1;

the positive electrode film includes one or more nitrone derivatives as an additive, a molecule of each of the one or more nitrone derivatives comprising a structure represented by formula (II) below:

17. A secondary battery, comprising

a positive electrode plate and an electrolyte solution;

wherein:

the positive electrode plate comprises a positive current collector and a positive electrode film provided on at least one surface of the positive current collector, wherein the positive electrode film comprises a positive electrode active material and a lithium supplement, and the lithium supplement includes at least one of substances represented by formula (I) below,

m Li x1 O· n (Ni y1 Mn y2 Co y3 Cu y4 Fe y5 )O  (I)

where:

1≤x1≤2;

0≤y1≤1; 0≤y2≤1; 0≤y3≤1; 0≤y4≤2; 0≤5≤1;

0.5≤y1+y2+y3+y4+y5≤1; and

1≤m≤3; 0≤n/m≤1;

the positive electrode film and/or the electrolyte solution includes one or more nitrone derivatives as an additive, a molecule of each of the one or more nitrone derivatives comprising a structure represented by formula (II) below:

and

the lithium supplement is coated with a coating layer, the coating layer including at least one of AlF 3 , Li 3 PO 4 , Li 2 MnO 3 , LiAlO 2 , Li 2 TiO 3 , Li 2 ZrO 3 , polyethylene glycol-modified poly-3,4-ethylenedioxythiophene (PEDOT), or conductive polymer polypyrrole (PPy).