Lithium-ion battery
AssigneeContemporary Amperex Technology Co., Limited
InventorsWenzhu XU, Chuanmiao YAN, Fuping LUO, Xinxin DU, Jiao CAO
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Abstract
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≤(OIc×PDc)/(OIa×PDa)≤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.
Claims20
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;
- 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.
Dependencies are inferred from the claim text.