Negative electrode active material, and electrochemical apparatus and electronic apparatus using the same
AssigneeNingde Amperex Technology Limited
InventorsWenbo Jin, Jiali Dong, Lihong He, Yuansen Xie
Life of this patent
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Abstract
A negative electrode active material includes a carbon material, where the carbon material has a specific degree of graphitization and aspect ratio distribution. A degree of graphitization Gr of the carbon material measured by an X-ray diffraction analysis method is 0.82 to 0.92, and based on a total quantity of particles of the carbon material, a proportion of particles with an aspect ratio greater than 3.3 in the carbon material is less than 10%. The negative electrode active material helps to improve cycle performance of the electrochemical apparatus. FIG. 1.
Claims20
A negative electrode active material comprising:
- a carbon material;
- wherein a degree of graphitization Gr of the carbon material measured by an X-ray diffraction analysis method is 0.82 to 0.92;
- and based on a total quantity of particles of the carbon material, a proportion of particles with an aspect ratio greater than 3.3 in the carbon material is greater than 1% and less than 10%;
- and
- based on the total quantity of the particles of the carbon material, a proportion of particles with an aspect ratio greater than 2 in the carbon material is greater than 30% and less than 50%.
An electrochemical apparatus, comprising a positive electrode, an electrolyte solution and a negative electrode;
- the negative electrode comprising a negative electrode active material layer and a negative electrode current collector, wherein the negative electrode active material layer comprises the negative electrode active material;
- the negative electrode active material comprises a carbon material, wherein a degree of graphitization Gr of the carbon material measured by an X-ray diffraction analysis method is 0.82 to 0.92;
- and based on a total quantity of particles of the carbon material, a proportion of particles with an aspect ratio greater than 3.3 in the carbon material is greater than 1% and less than 10%;
- and
- based on the total quantity of the particles of the carbon material, a proportion of particles with an aspect ratio greater than 2 in the carbon material is greater than 30% and less than 50%.
An electronic apparatus, comprising an electrochemical apparatus;
- the electrochemical apparatus comprising a positive electrode, a negative electrode, a separator and an electrolyte solution;
- the negative electrode comprising a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer comprises a negative electrode active material;
- the negative electrode active material comprises a carbon material, wherein a degree of graphitization Gr of the carbon material measured by an X-ray diffraction analysis method is 0.82 to 0.92, and based on a total quantity of particles of the carbon material, a proportion of particles with an aspect ratio greater than 3.3 in the carbon material is greater than 1% and less than 10%;
- and
- based on the total quantity of the particles of the carbon material, a proportion of particles with an aspect ratio greater than 2 in the carbon material is greater than 30% and less than 50%.
Dependencies are inferred from the claim text.