Lithium-ion battery of fast-charging capability
The present disclosure provides a lithium-ion battery, the lithium-ion battery comprises a positive electrode plate, a negative electrode plate, a separator and an electrolyte, the positive active material comprises a layered lithium-containing compound, the negative active material comprises graphite, the positive film and the negative film satisfy a relationship 0.3≤(OI c ×PD c )/(OI a ×PD a )≤20.0. The present disclosure can make the lithium-ion battery have smaller swelling and higher charging capability, and also make the lithium-ion battery have excellent cycle life and excellent safety performance during the long-term fast charging process.
1. A lithium-ion battery comprising a positive electrode plate, a negative electrode plate, a separator and an electrolyte, the positive electrode plate comprising a positive current collector and a positive film, the positive film being provided on at least one surface of the positive current collector and comprising a positive active material, 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 positive active material comprises a layered lithium-containing compound, and the layered lithium-containing compound comprises lithium nickel cobalt manganese oxide or lithium nickel cobalt aluminum oxide;
the negative active material comprises graphite;
the positive film and the negative film satisfy a relationship 0.3≤(OIc×PDc)/(OIa×PDa)≤20.0;
OIc represents an OI value of the positive film, and OIc-C003/C110, C003 represents characteristic diffraction peak area of (003) crystal plane in X-ray diffraction pattern of the positive electrode plate, C110 represents characteristic diffraction peak area of (110) crystal plane in X-ray diffraction pattern of the positive electrode plate;
PDc represents a pressing density of the positive film with a unit of g/dm3;
OIa represents an OI value of the negative film, and OIa-C004/C110, C004 represents characteristic diffraction peak area of (004) crystal plane in X-ray diffraction pattern of the negative electrode plate, C110 represents characteristic diffraction peak area of (110) crystal plane in X-ray diffraction pattern of the negative electrode plate;
PDa represents a pressing density of the negative film with a unit of g/dm3;
the OI value of the positive film represented by OIc is 8-70; and
an OI value of a powder of the positive active material represented by Gor is from 3 to 15, wherein, Gor-C003/C110, C003 represents characteristic diffraction peak area of (003) crystal plane in X-ray diffraction pattern of the powder of the positive active material, C110 represents characteristic diffraction peak area of (110) crystal plane in X-ray diffraction pattern of the powder of the positive active material.
2. The lithium-ion battery according to claim 1 , wherein the positive film and the negative film satisfy a relationship 1.71≤(OIc×PDc)/(OIa×PDa)≤8.40.
3. The lithium-ion battery according to claim 2 , wherein the positive film and the negative film satisfy a relationship 2.64≤(OIc×PDc)/(OIa×PDa)≤6.0.
4. The lithium-ion battery according to claim 3 , wherein the positive film and the negative film satisfy a relationship 3.68≤(OIc×PDc)/(OIa×PDa)≤6.0.
5. The lithium-ion battery according to claim 1 , wherein
the positive film satisfies a relationship 79200≤OIc×PDc≤323840; and/or
the negative film satisfies a relationship 20000≤OIa×PDa≤50250.
6. The lithium-ion battery according to claim 5 , wherein
the positive film satisfies a relationship 110400≤OIc×PDc≤182000.
7. The lithium-ion battery according to claim 5 , wherein
the negative film satisfies a relationship 20000≤OIa×PDa≤30000.
8. The lithium-ion battery according to claim 1 , wherein
the OI value of the positive film represented by OIc is 10-70; and/or
the OI value of the negative film represented by OIa is 5-40.
9. The lithium-ion battery according to claim 1 , wherein
the OI value of the positive film represented by OIc is 24-52.
10. The lithium-ion battery according to claim 1 , wherein
the pressing density of the positive film represented by PDc is 3.3×10 3 g/dm 3 −3.5×10 3 g/dm 3 ; and/or
the pressing density of the negative film represented by PDa is 1.4×10 3 g/dm 3 −1.65×10 3 g/dm 3 .
11. The lithium-ion battery according to claim 1 , wherein
the positive film and the negative film satisfy a relationship 1.78≤(OIc×ρ c)/(OIa×ρ a)≤6.0;
ρ c represents an areal density of the positive film with a unit of g/cm 2 ;
ρ a represents an areal density of the negative film with a unit of g/cm 2 .
12. The lithium-ion battery according to claim 11 , wherein
the positive film and the negative film satisfy a relationship 2.52≤(OIc×ρ c)/(OIa×ρ a)≤6.0.
13. The lithium-ion battery according to claim 11 , wherein
the positive film satisfies a relationship 0.173≤OIc×ρ c≤0.845; and/or
the negative film satisfies a relationship 0.080≤OIa×ρ a≤0.360.
14. The lithium-ion battery according to claim 13 , wherein
the positive film satisfies a relationship 0.353≤OIc×ρ c≤0.845; and/or
the negative film satisfies a relationship 0.140≤OIa×ρ a≤0.20.
15. The lithium-ion battery according to claim 11 , wherein
the areal density of the positive film represented by ρc is 0.01 g/cm 2 −0.02 g/cm 2 ; and/or
the areal density of the negative film represented by ρa is 0.007 g/cm 2 −0.013 g/cm 2 .
16. The lithium-ion battery according to claim 15 , wherein
the areal density of the positive film represented by ρc is 0.015 g/cm 2 −0.02 g/cm 2 ; and/or
the areal density of the negative film represented by ρa is 0.007 g/cm 2 −0.009 g/cm 2 .
17. The lithium-ion battery according to claim 1 , wherein
an average particle size D50 of the positive active material is 2 μm-10 μm; and/or
an average particle size D50 of the negative active material is 4 μm-15 μm.
18. The lithium-ion battery according to claim 17 , wherein
the average particle size D50 of the positive active material is 2.5 μm-7.3 μm; and/or
the average particle size D50 of the negative active material is 5.5 μm-12 μm.
19. The lithium-ion battery according to claim 1 , wherein at least a part of the positive active material is single particle.
20. The lithium-ion battery according to claim 1 , wherein the OI value of a powder of the positive active material represented by GOI is from 5 to 10.