SECONDARY BATTERY, BATTERY MODULE, BATTERY PACK AND POWER CONSUMING DEVICE

1 . A secondary battery, comprising:

a negative electrode plate comprising:

a negative electrode current collector; and

a negative electrode film layer provided on at least one surface of the negative electrode current collector, the negative electrode film layer comprising a negative electrode active material; and

a positive electrode plate comprising:

a positive electrode current collector; and

a positive electrode film layer provided on at least one surface of the positive electrode current collector, the positive electrode film layer comprising a positive electrode active material;

wherein:

the negative electrode active material is selected from one or more of a silicon-based material and a tin-based material; and

the positive electrode active material has a molecular formula of M1 x Mn y M2 z O a A b , wherein M1 represents one or two of Mg and Al, M2 represents one or two of Co and Ni, A represents one or more of N, P, and S, 0<x≤3, 0<y≤6, 0<z≤6, 0<y+z≤8, 0<a≤12, 0<b≤12, and 0<a+b≤15.

2 . The secondary battery according to claim 1 , wherein a mass content percentage of the positive electrode active material is 2%-70% of a total mass of the positive electrode film layer.

3 . The secondary battery according to claim 1 , wherein a mass content percentage of the positive electrode active material is 2.4%-55% of a total mass of the positive electrode film layer.

4 . The secondary battery according to claim 1 , wherein a mass ratio of the positive electrode active material to the negative electrode active material is (0.48-0.70):1.

5 . The secondary battery according to claim 1 , wherein a mass content percentage of the negative electrode active material is 5%-50% of a total mass of the negative electrode film layer.

6 . The secondary battery according to claim 1 , wherein a mass content percentage of the negative electrode active material is 5%-29% of a total mass of the negative electrode film layer.

7 . The secondary battery according to claim 1 , wherein the positive electrode active material satisfies at least one of:

0<y≤3,

0<z≤1,

0<b≤5, or

0<b≤1.

8 . The secondary battery according to claim 1 , wherein the positive electrode active material has at least one of a spinel structure or a layered structure.

9 . The secondary battery according to claim 1 , wherein the positive electrode active material comprises one or more of MgMn 2 O 4 , Mg 2 Mn 2 O 4 , Al 2 Mn 2 O 5 , MgAlMnO 4 , Mg 2 AlMnO 5 , Mg 2 Mn 1.5 Ni 0.5 O 4 , and Mg 2 Mn 1.5 Ni 0.5 O 3.2 S 0.8 .

10 . The secondary battery according to claim 1 , wherein the positive electrode active l material has a volume-average particle size Dv50 of 8 μm-20 μm.

11 . The secondary battery according to claim 1 , wherein the positive electrode active material has a specific surface area of 0.2 m 2 /g-0.9 m 2 /g.

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

the silicon-based material comprises one or more of elemental silicon, silicon oxides, silicon carbon composites, silicon nitrogen composites, and silicon alloy materials; and/or

the tin-based material comprises one or more of elemental tin, tin oxides, tin carbon composites, and tin alloy materials.

13 . The secondary battery according to claim 1 , wherein the secondary battery is a lithium ion battery, a sodium ion battery, a potassium ion battery, a zinc ion battery, a calcium ion battery, or a barium ion battery.

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

15 . A battery module, comprising:

a secondary battery comprising:.

a negative electrode plate comprising:

a negative electrode current collector; and

a negative electrode film layer provided on at least one surface of the negative electrode current collector, the negative electrode film layer comprising a negative electrode active material; and

a positive electrode plate comprising:

a positive electrode current collector; and

a positive electrode film layer provided on at least one surface of the positive electrode current collector, the positive electrode film layer comprising a positive electrode active material;

wherein:

the negative electrode active material is selected from one or more of a silicon-based material and a tin-based material; and

the positive electrode active material has a molecular formula of M1 x Mn y M2 z O a A b , wherein M1 represents one or two of Mg and Al, M2 represents one or two of Co and Ni, A represents one or more of N, P, and S, 0<x≤3, 0<y≤6, 0≤z≤6, 0<y+z≤8, 0<a≤12, 0≤b≤12, and 0<a+b≤15.

16 . A battery pack, comprising:

a secondary battery comprising:

a negative electrode plate comprising:

a negative electrode current collector; and

a negative electrode film layer provided on at least one surface of the negative electrode current collector, the negative electrode film layer comprising a negative electrode active material; and

a positive electrode plate comprising:

a positive electrode current collector; and

a positive electrode film layer provided on at least one surface of the positive electrode current collector, the positive electrode film layer comprising a positive electrode active material;

wherein:

the negative electrode active material is selected from one or more of a silicon-based material and a tin-based material; and

the positive electrode active material has a molecular formula of M1 x Mn y M2 z O a A b , wherein M1 represents one or two of Mg and Al, M2 represents one or two of Co and Ni, A represents one or more of N, P, and S, 0<x≤3, 0<y≤6, 0≤z≤6, 0<y+z≤8, 0<a≤12, 0≤b≤12, and 0<a+b≤15.