US 2025/0051166 A1 · ANODE MATERIAL, PREPARATION METHOD THEREOF, AND LITHIUM ION BATTERY

Abstract

Relating to the field of anode material, an anode material, a preparation method thereof and a lithium ion battery provided. The anode material includes an aggregate, and the aggregate includes a carbon material and a silicon-based material, where the anode material has a porosity W of ≤2.5%, and particles with a pore diameter of >50 nm in the anode material has a quantity proportion P of ≤1%. The porosity of the anode material is obtained by the following test method: a pore volume ΔV of the anode material is tested by using a micro-pores size distribution method; and a true density P of the anode material is tested, and the porosity W of the anode material is calculated to be W=ΔV/(ΔV+1/P). The anode material effectively isolates electrolyte, prevents structure of the anode material from collapsing, and improves cycle performance of the battery.

Claims20

Dependent claims

An anode material, comprising an aggregate, and the aggregate comprises a carbon material and a silicon-based material, wherein the anode material has a porosity W of ≤2.5%, and particles with a pore diameter of >50 nm in the anode material has a quantity proportion P of ≤1%;

and
wherein the porosity of the anode material is obtained by the following test method:
a pore volume ΔV of the anode material is tested by using a micro-pores size distribution method;
and a true density P of the anode material is tested, and the porosity W of the anode material is calculated to be W=ΔV/(ΔV+1/P).

1 more element

A preparation method of an anode material, comprising:

grade-mixing a carbon material, a silicon-based material and a solvent to obtain a first precursor, wherein the first precursor comprises the carbon material and the silicon-based material, and the grade-mixing process comprises vacuum impregnation;
mixing the first precursor, a first carbon source and a defoaming agent, and performing densification, to obtain a second precursor;
and
carbonizing the second precursor to obtain an aggregate.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

18/923,590Filed 22 Oct 2024

Priority

CN 202210431181.822 Apr 2022

Published

13 Feb 2025

Term ends

Not estimatedThe source records don’t support an estimate.

Classification34 codes

C01B 32/05
Carbon; Compounds thereof: preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
H01M 4/36
Electrodes composed of, or comprising, active material: selection of substances as active materials, active masses, active liquids
H01M 4/133
Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof: electrodes based on…
H01M 4/134
Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof: electrodes based on…

Anode material, preparation method thereof, and lithium ion battery

Life of this patent

Anode material, preparation method thereof, and lithium ion battery

Life of this patent

Abstract

Claims20