Negative electrode and battery
The present invention provides a negative electrode plate and a battery. The negative electrode plate comprises a negative current collector and a negative film that is provided on at least one surface of the negative current collector and comprises a negative active material. The negative film meets the follow relations: 6.0≤PD×Dv50≤32.0 and 0.2≤PD/Dn10≤12.0. The negative electrode plate of the present invention has excellent dynamic performance, and the battery of the present invention has both excellent dynamic performance and long cycle life.
1. A battery comprising a positive electrode plate and a negative electrode plate, the positive electrode plate comprising a positive electrode current collector and a positive electrode film which is provided on at least one surface of the positive electrode current collector and comprises a positive active material, and the negative electrode plate comprising a negative electrode current collector and a negative electrode film which is provided on at least one surface of the negative electrode current collector and comprises a negative active material,
characterized in that
the positive active material is selected from lithium-containing phosphate salts with an olivine structure;
the negative active material is selected from graphite;
the negative electrode film satisfies: 6.0≤PD×Dv50≤32.0 and 0.2≤PD/Dn10≤12.0,
the negative active material has a particle size Dn10 of 0.2 μm to 6.0 μm,
the negative electrode film has a compacted density PD of 1.0 g/cm 3 to 1.6 g/cm 3 ,
in which
PD represents a compacted density of the negative electrode film in g/cm 3 ;
Dv50 represents a particle size at which the negative active material reaches 50% of cumulative volume percentage in μm;
Dn10 represents a particle size at which the negative active material reaches 10% of cumulative number percentage in μm.
2. The battery according to claim 1 , wherein the negative electrode film satisfies: 7.0≤PD×Dv50≤23.0.
3. The battery according to claim 2 , wherein the negative electrode film satisfies: 7.5≤PD×Dv50≤16.0.
4. The battery according to claim 1 , wherein the negative electrode film satisfies: 0.3≤PD/Dn10≤9.0.
5. The battery according to claim 4 , wherein the negative electrode film satisfies: 0.35≤PD/Dn10≤6.0.
6. The battery according to claim 1 , wherein the negative active material has a particle size Dv50 of 4 μm to 12 μm.
7. The battery according to claim 6 , wherein the negative active material has a particle size Dv50 of 4 μm to 8 μm.
8. The battery according to claim 1 , wherein the negative active material has a particle size Dn10 of 0.2 μm to 2.0 μm.
9. The battery according to claim 1 , wherein the negative active material has a particle size Dn10 of 0.2 μm to 1.0 μm.
10. The battery according to claim 1 , wherein the negative electrode film has a compacted density PD of 1.0 g/cm 3 to 1.5 g/cm 3 .
11. The battery according to claim 1 , wherein the negative electrode film also satisfies: 1.0≤CW×Dv90≤4.0
in which
CW represents a coating weight per unit area of the negative electrode plate, in mg/mm 2 ;
Dv90 represents a particle size at which the negative active material reaches 90% of cumulative volume percentage, in μm.
12. The battery according to claim 11 , wherein the negative electrode film satisfies: 1.5≤CW×Dv90≤3.0.
13. The battery according to claim 11 , wherein the coating weight CW per unit area of the negative electrode plate is from 0.01 mg/mm 2 to 0.20 mg/mm 2 ; and/or
the particle size Dv90 of the negative active material is from 12 μm to 35 μm.
14. The battery according to claim 13 , wherein the coating weight CW per unit area of the negative electrode plate is from 0.04 mg/mm 2 to 0.12 mg/mm 2 ; and/or
the particle size Dv90 of the negative active material is from 18 μm to 30 μm.