Negative electrode plate and battery
The present disclosure provides a negative electrode plate and a battery, the negative electrode plate comprises a negative current collector and a negative film, the negative film is provided on at least one surface of the negative current collector and comprises a negative active material. The negative active material comprises graphite, and an OI value of the negative film represented by V OI and a pressing density of the negative film represented by PD satisfy a relationship: 0.7≤(80/V OI +43/PD)×PD/V OI ≤21.5, where a unit of the pressing density of the negative film represented by PD is g/cm 3 . The battery of the present disclosure can have the characteristics of fast charging speed, high energy density, good safety performance and long cycle life at the same time.
1. A battery comprising a negative electrode plate, the negative electrode plate comprising a negative current collector and a negative film, the negative film being provided on at least one surface of the negative current collector and comprising a negative active material;
wherein
the negative active material is graphite, and an OI value of the negative film represented by V OI and a pressing density of the negative film represented by PD satisfy a relationship: X=(80/V OI +43/PD)×PD/V OI and 1.66<X≤2.35, and a unit of the pressing density of the negative film represented by PD is g/cm 3 ,
V OI =C 004 /C 110 , C 004 represents a characteristic diffraction peak area of (004) crystal plane in X-ray diffraction pattern of the negative film, C 110 represents a characteristic diffraction peak area of (110) crystal plane in X-ray diffraction pattern of the negative film;
the OI value of the negative film represented by V OI is 20˜32;
a particle diameter of the negative active material represented by D50 and an OI value of a powder of the negative active material represented by G OI satisfy a relationship: Y=100/(D50+2.8×G OI ) and 2.8≤Y≤12, and a unit of the particle diameter of the negative active material represented by D50 is μm;
G OI =C′ 004 /C′ 110 , C′ 004 represents a characteristic diffraction peak area of (004) crystal plane in X-ray diffraction pattern of a powder of the negative active material, C′ 110 represents a characteristic diffraction peak area of (110) crystal plane in X-ray diffraction pattern of the powder of the negative active material; and
2.8≤(X×0.8+Y×0.2)×Y/X≤11.71.
2. The battery according to claim 1 , wherein the particle diameter of the negative active material represented by D50 is 1 μm˜20 μm.
3. The battery according to claim 2 , wherein the particle diameter of the negative active material represented by D50 is 4 μm˜15 μm.
4. The battery according to claim 3 , wherein the particle diameter of the negative active material represented by D50 is 6 μm˜12 μm.
5. The battery according to claim 1 , wherein the graphite is one or more selected from a group consisting of natural graphite and artificial graphite.
6. The battery according to claim 1 , wherein the pressing density of the negative film represented by PD is 1.0 g/cm 3 ˜1.6 g/cm 3 .
7. The battery according to claim 6 , wherein the pressing density of the negative film represented by PD is 1.2 g/cm 3 ˜1.5 g/cm 3 .
8. The battery according to claim 1 , wherein the particle diameter of the negative active material represented by D50 and the OI value of the powder of the negative active material represented by G OI satisfy a relationship: 3.14≤8.45.
9. The battery according to claim 8 , wherein the particle diameter of the negative active material represented by D50 and the OI value of the powder of the negative active material represented by G OI satisfy a relationship: 3.14≤Y≤5.87.
10. The battery according to claim 1 , wherein 4.05≤(X×0.8+Y×0.2)×Y/X≤8.13.
11. The battery according to claim 1 , wherein the OI value of the powder of the negative active material represented by G OI is 2˜4.5.
12. The battery according to claim 1 , wherein the battery further comprises a positive electrode plate, the positive electrode plate comprises a positive current collector and a positive film, the positive film is provided on at least one surface of the positive current collector and comprises a positive active material, the positive active material is one or more selected from a group consisting of lithium nickel cobalt manganese oxide and lithium nickel cobalt aluminum oxide.