Negative electrode active material, and electrochemical apparatus and electronic apparatus using the same
AssigneeNingde Amperex Technology Limited
InventorsJia Tang, Lihong He, Pengyang Feng, Yuansen Xie
Life of this patent
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Abstract
A negative electrode active material having a specific aspect ratio and sphericity in a cumulative particle volume distribution. When tested by using a dynamic particle image analyzer, when a cumulative particle volume distribution of the negative electrode active material is 10%, an aspect ratio AR10 of the negative electrode active material satisfies 0.4≤AR10≤0.55, and a sphericity S10 of the negative electrode active material satisfies 0.48≤S10≤0.60. The negative electrode active material improves rate performance, dynamics performance, and a deformation problem of the electrochemical apparatus.
Claims13
A negative electrode active material, wherein, particles of the negative electrode active material at a cumulative particle volume distribution of the negative electrode active material of 10%, as tested by using a dynamic particle image analyzer, have an aspect ratio AR10 of 0.4≤AR10≤0.55, and a sphericity S10 of 0.48≤S10≤0.60;
- wherein particles of the negative electrode material at the cumulative particle volume distribution of the negative electrode active material of 50%, as tested by using the dynamic particle image analyzer, have an aspect ratio AR50 of 0.6≤AR50≤0.75, and a sphericity S50 of 0.68≤S50≤0.82;
- wherein particles of the negative electrode material at the cumulative particle volume distribution of the negative electrode active material of 90%, as tested by using the dynamic particle image analyzer, have an aspect ratio AR90 of 0.82≤AR90≤0.90, and a sphericity S90 of 0.85≤S90≤0.95.
An 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, wherein, particles of the negative electrode active material at a cumulative particle volume distribution of the negative electrode active material of 10%, as tested by using a dynamic particle image analyzer, have an aspect ratio AR10 of 0.4≤AR10≤0.55, and a sphericity S10 of 0.48≤S10≤0.60;
- wherein particles of the negative electrode material at the cumulative particle volume distribution of the negative electrode active material of 50%, as tested by using the dynamic particle image analyzer, have an aspect ratio AR50 of 0.6≤AR50≤0.75, and a sphericity S50 of 0.68≤S50≤0.82;
- wherein particles of the negative electrode material at the cumulative particle volume distribution of the negative electrode active material of 90%, as tested by using the dynamic particle image analyzer, have an aspect ratio AR90 of 0.82≤AR90≤0.90, and a sphericity S90 of 0.85≤S90≤0.95.
An electronic apparatus, comprising an electrochemical apparatus, the electrochemical apparatus comprising a 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 an negative electrode active material;
- the negative electrode active material, wherein, particles of the negative electrode active material at a cumulative particle volume distribution of the negative electrode active material of 10%, as tested by using a dynamic particle image analyzer, have an aspect ratio AR10 of 0.4≤AR10≤0.55, and a sphericity S10 of 0.48≤S10≤0.60;
- wherein particles of the negative electrode material at the cumulative particle volume distribution of the negative electrode active material of 50%, as tested by using the dynamic particle image analyzer, have an aspect ratio AR50 of 0.6≤AR50≤0.75, and a sphericity S50 of 0.68≤S50≤0.82;
- wherein particles of the negative electrode material at the cumulative particle volume distribution of the negative electrode active material of 90%, as tested by using the dynamic particle image analyzer, have an aspect ratio AR90 of 0.82≤AR90≤0.90, and a sphericity S90 of 0.85≤S90≤0.95.
Dependencies are inferred from the claim text.