Negative electrode active material, negative electrode piece, battery, battery module, and power consumption device

Abstract

This disclosure relates to a negative electrode active material, a negative electrode piece, a battery, a battery module, and a power consumption device. If the particle size distribution of the negative electrode active material is A and the degree of defects is B, then the particle size distribution A is (D90-D10) / D50, and the degree of defects B of the negative electrode active material is I D / I G Furthermore, the ratio of the particle size distribution A to the defect degree B of the negative electrode active material is 6.0 ≤ A / B ≤ 7.2. By controlling the ratio of the particle size distribution A to the defect degree B of the negative electrode active material within the above range, the battery's cycle performance and storage performance are significantly improved.

Claims

1. In a negative electrode active material, if the particle size distribution of the negative electrode active material is A and the degree of defects is B, then the particle size distribution A is (D90 - D10) / D50, and the degree of defects B of the negative electrode active material is I Ｄ / I Ｇ A negative electrode active material wherein the ratio of the particle size distribution A to the defect degree B of the negative electrode active material is 6.0 ≤ A / B ≤ 7.

2.

2. The negative electrode active material according to claim 1, wherein the ratio of the particle size distribution A to the defect degree B of the negative electrode active material is 6.17 ≤ A / B ≤ 6.

91.

3. The negative electrode active material according to claim 1 or claim 2, wherein the particle size distribution A is 0.8 to 2.

0.

4. The negative electrode active material according to any one of claims 1 to 3, wherein the defect degree B is 0.1 to 0.

35.

5. The negative electrode active material according to any one of claims 1 to 4, wherein the D90 of the negative electrode active material is 21.0 μm to 32.0 μm, the D10 of the negative electrode active material is 4.0 μm to 8.5 μm, and the D50 of the negative electrode active material is 12.0 μm to 18.0 μm.

6. The anode active material according to any one of claims 1 to 5, comprising one or more selected from the group consisting of carbon-based anode materials, tin-based anode materials, lithium-containing transition metal nitride anode materials, alloy-based anode materials, and nanoscale anode materials.

7. A negative electrode piece comprising a current collector and a negative electrode active material layer laminated on the current collector and containing the negative electrode active material described in any one of claims 1 to 6.

8. Electrolyte and A positive electrode piece, at least a portion of which is immersed in the electrolyte, A separator located on one side of the positive electrode piece, with at least a portion of it immersed in the electrolyte, A battery comprising: a negative electrode piece according to claim 7, provided on the opposite side of the separator from the positive electrode piece, and at least a portion of which is immersed in the electrolyte.

9. A battery module comprising the battery described in claim 8.

10. A power consumption device comprising the battery module described in claim 9.

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