Positive electrode plate and battery
The present disclosure provides a positive electrode plate and a battery, the positive electrode plate comprises a positive current collector and a positive film, the positive film is provided on least one surface of the positive current collector and comprises a positive active material, the positive active material comprises a layered lithium-containing compound, and an OI value of the positive film represented by C OI is less than or equal to 150. The positive electrode plate of the present disclosure has smaller swelling and excellent dynamics performance, and the battery of the present disclosure has high safety performance, excellent dynamics performance and long cycle life at the same time.
1. A battery comprising a positive electrode plate, the positive electrode plate comprising a positive current collector and a positive film, the positive film being provided on least one surface of the positive current collector and comprising a positive active material,
wherein the positive active material comprises a layered lithium-containing compound, and an OI value of the positive film represented by C OI is 5˜100;
wherein C OI =C 003 /C 110 , where C 003 represents characteristic diffraction peak area of (003) crystal plane in X-ray diffraction pattern of the positive film, and C 110 represents characteristic diffraction peak area of (110) crystal plane in X-ray diffraction pattern of the positive film.
2. The battery according to claim 1 , wherein the positive electrode plate further satisfies a relationship: 0.05<C OI ×ρ≤2, where p represents an areal density of the positive film with a unit of g/cm 2 .
3. The battery according to claim 1 , wherein the layered lithium-containing compound is one or more selected from a group consisting of LiNi x Co y Mn 1-x-y O 2 , LiNi x Co y Al 1-x-y O 2 and modified compounds of the aforementioned compounds, 0<x<1, 0<y<1, 0<x+y<1.
4. The battery according to claim 1 , wherein the OI value of the positive film represented by C OI is 10˜70.
5. The battery according to claim 4 , wherein the OI value of the positive film represented by C OI is 15˜70.
6. The battery according to claim 5 , wherein the OI value of the positive film represented by C OI is 35˜70.
7. The battery according to claim 2 , wherein the positive electrode plate satisfies a relationship: 0.20≤C OI ×ρ≤1.50.
8. The battery according to claim 7 , wherein the positive electrode plate satisfies a relationship: 0.40≤C OI ×ρ≤0.98.
9. The battery according to claim 2 , wherein the areal density of the positive film represented by p is 0.014 g/cm 2 ˜0.03 g/cm 2 .
10. The battery according to claim 9 , wherein the areal density of the positive film represented by p is 0.014 g/cm 2 ˜0.02 g/cm 2 .
11. The battery according to claim 1 , wherein an average particle size D50 of the positive active material is 1 μm˜12 μm.
12. The battery according to claim 11 , wherein the average particle size D50 of the positive active material is 4 μm˜8 μm.
13. The battery according to claim 1 , wherein an OI value of a powder of the positive active material represented by G OI is 1˜15.
14. The battery according to claim 13 , wherein the OI value of a powder of the positive active material represented by G OI is 3˜10.
15. The battery according to claim 1 , wherein a pressing density of the positive film represented by PD is 3.1 g/cm 3 ˜3.6 g/cm 3 .
16. The battery according to claim 15 , wherein the pressing density of the positive film represented by PD is 3.3 g/cm 3 ˜3.6 g/cm 3 .
17. The battery according to claim 1 , wherein at least a part of the positive active material is monocrystal particles.
18. The battery according to claim 1 , wherein the positive active material further comprises one or more selected from a group consisting of spinel lithium manganese oxide, spinel lithium nickel manganese oxide and polyanion-type positive active material.
19. The battery according to claim 1 , wherein the battery further comprises a negative electrode plate, an electrolyte and a separator.