# US 12,183,923 B2 · Carbon-based anode material having surface formed with slightly oxidized pores, and method for preparing same

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- Number: US 12,183,923 B2
- Document ID: US12183923B2
- Status: Granted
- Kind: B2
- Application number: 17/535,583
- Filed: 2021-11-25
- Published: 2022-06-16
- Granted: 2024-12-31
- Earliest claimed: 2020-12-11
- Assignees: Guangdong Kaijin New Energy Technology Co., Ltd.
- Applicants: Guangdong Kaijin New Energy Technology Co., Ltd.
- Inventors: Chuanchang Ge; Yongjun Yang
- Web page: https://patentgrep.com/patent/US12183923B2

## CPC

- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/583: Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- C01B 32/05: Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
- H01M 4/1393: of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/587: for inserting or intercalating light metals
- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M 4/622: {being polymers}
- H01M 4/624: {Electric conductive fillers}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/027: {Negative electrodes}
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A carbon-based anode material having a surface formed with slightly oxidized pores, includes by weight: 10-30 parts of clay minerals, 5-8 parts of chitosan, 0.1-1 part of a cationic polymer, 0.1-1 part of tris-1-(2-methylaziridinyl) phosphine oxide, 3-8 parts of a conductive agent, 3-8 parts of absolute ethyl alcohol, 1-3 parts of potassium oxalate, and 10-15 parts of a binder. According to the invention, the cationic polymer and the tris-1-(2-methylaziridinyl) phosphine oxide are added on the basis of the chitosan and the clay minerals, the cationic polymer contains polynuclear olation complex ions with a high positive electrovalence, thus being able to closely adhering to the surface of clay to form a three-dimensional net structure, so multiple slightly oxidized pores are formed in the surface of the obtained carbon-based material in a carbonization process, and the finally obtained carbon-based anode material has good charge-discharge performance and cycle performance.

## Claims

### Claim 1

A carbon-based anode material having a surface formed with oxidized pores, comprising by weight:
10-30 parts of clay minerals, 5-8 parts of chitosan, 0.1-1 part of a cationic polymer,
0.1-1 part of tris-1-(2-methylaziridinyl) phosphine oxide, 3-8 parts of a conductive agent, 3-8 parts of absolute ethyl alcohol, 1-3 parts of potassium oxalate, and 10-15 parts of a binder.

### Claim 2 (depends on 1)

The carbon-based anode material having a surface formed with oxidized pores according to claim 1, wherein the clay minerals comprise bentonite, vermiculite and kieselguhr, a mass ratio of which is 7:10-15:5-8.

### Claim 3 (depends on 1)

The carbon-based anode material having a surface formed with oxidized pores according to claim 1, wherein the cationic polymer is one or a combination of hydroxyl aluminium and hydroxyl zirconium.

### Claim 4 (depends on 1)

The carbon-based anode material having a surface formed with oxidized pores according to claim 1, wherein a mass ratio of the clay minerals, the chitosan and the cationic polymer is 2-3:1:0.1-0.2.

### Claim 5 (depends on 1)

A method for preparing the carbon-based anode material having a surface formed with oxidized pores according to claim 1, comprising:
S1: placing clay minerals in a three-necked bottle, adding water to prepare a suspension liquid, adding a nitric acid solution for activation, and regulating pH to 4-6; sequentially adding a cationic polymer and tris-1-(2-methylaziridinyl) phosphine oxide into the three-necked bottle containing the clay minerals, and stirring at indoor temperature for reaction; then, adding chitosan, stirring in a thermostatic water bath at 100° C.-120° C. for reaction, then cooling to the indoor temperature, carrying out extraction filtration, and washing with water until the pH is neutral, so that a mixed liquor is obtained;
S2: placing, under the protection of an inert gas, the mixed liquor into a high-temperature heating furnace for carbonization treatment, so that a carbon-based material having a surface formed with oxidized pores is obtained; and
S3: mixing the carbon-based material having a surface formed with oxidized pores with a conductive agent to obtain a mixture, then grinding the mixture, dispersing the ground mixture into absolute ethyl alcohol, adding a binder and potassium oxalate, and evenly stirring, drying and tabletting to obtain the carbon-based anode material having a surface formed with oxidized pores.

### Claim 6 (depends on 5)

The method for preparing the carbon-based anode material having a surface formed with oxidized pores according to claim 5, wherein in S1, a mass concentration of the suspension liquid is 4%, and a mass concentration of the nitric acid solution is 1%.

### Claim 7 (depends on 5)

The method for preparing the carbon-based anode material having a surface formed with oxidized pores according to claim 5, wherein in S1, a time for stirring at the indoor temperature for reaction is 4 h-5 h, and a time for stirring in the thermostatic water bath for reaction is 4 h-5 h.

### Claim 8 (depends on 5)

The method for preparing the carbon-based anode material having a surface formed with oxidized pores according to claim 5, wherein in S2, the inert gas is nitrogen or argon.

### Claim 9 (depends on 5)

The method for preparing the carbon-based anode material having a surface formed with oxidized pores according to claim 5, wherein in S2, a temperature for the carbonization treatment is 600° C.-800° C., a pressure is 30 MPa-50 MPa, and a reaction time is 10 h-20 h.

### Claim 10 (depends on 5)

The method for preparing the carbon-based anode material having a surface formed with oxidized pores according to claim 5, wherein in S3, a mass ratio of the carbon-based material having a surface formed with oxidized pores, and the conductive agent is 3-4:0.3-0.5.