# US 2023/0054947 A1 · Negative electrode active material for lead storage battery and pb/c battery, preparation method therefor, and lead storage battery and pb/c battery comprising negative electrode active material

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- Number: US 2023/0054947 A1
- Document ID: US20230054947A1
- Status: Published application
- Kind: A1
- Application number: 17/774,221
- Filed: 2020-11-06
- Published: 2023-02-23
- Earliest claimed: 2019-11-08
- Assignees: Industry Foundation of Chonnam National University
- Applicants: Industry Foundation of Chonnam National University
- Inventors: Ho Young JUNG; Sadhasivam THANGARASU
- Web page: https://patentgrep.com/patent/US20230054947A1

## CPC

- H01M 4/364: {as mixtures}
- H01M 10/06: Lead-acid accumulators (semi-lead accumulators H01M10/20)
- H01G 11/04: Hybrid capacitors
- H01G 11/30: characterised by their material
- H01M 4/02: Electrodes composed of, or comprising, active material
- H01M 4/14: Electrodes for lead-acid accumulators
- H01M 4/20: of pasted electrodes
- H01M 4/36: Selection of substances as active materials, active masses, active liquids
- H01M 4/362: {Composites}
- H01M 4/38: of elements or alloys
- H01M 4/56: of lead
- H01M 4/583: Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M 4/625: {Carbon or graphite}
- H01M 4/627: {Expanders for lead-acid accumulators}
- 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
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A negative electrode active material for a lead storage battery or a Pb/C battery according to an embodiment includes a porous carbon material having a plurality of pores and a lead nanoparticle formed in the pores. The material may be capable of controlling the crystal size of lead sulfate produced at a negative electrode during discharging of a lead storage battery and a Pb/C battery.

## Claims

### Claim at position 1

1: A negative electrode active material for at least one of a lead storage battery and Pb/C battery, the negative electrode active material comprising:
a porous carbon material having a plurality of pores; and
a lead nanoparticle formed in the pores.

### Claim at position 2 (depends on 1)

2: The negative electrode active material of claim 1, wherein the porous carbon material is an activated carbon or carbon nanotubes.

### Claim at position 3 (depends on 2)

3: The negative electrode active material of claim 2, wherein the porous carbon material is obtained by activation with KOH, NaOH, or both at a temperature of 100° C. to 3000° C. and then carbonizing the activated raw material at a temperature of 300° C. to 900° C.

### Claim at position 4 (depends on 1)

4: The negative electrode active material of claim 1, wherein the porous carbon material and the lead nanoparticles are comprised in a weight ratio of 100:0 to 50:50.

### Claim at position 5 (depends on 1)

5: The negative electrode active material, according to claim 1, wherein the lead nanoparticles have a size of 1 to 1000 nm and are uniformly supported on the porous carbon material.

### Claim at position 6

6: A method of preparing a negative electrode active material for at least one of a lead storage battery and Pb/C battery, the method comprising:
preparing a carbon material dispersion solution by dispersing a porous carbon material having a plurality of pores in a solvent;
impregnating the pores of the carbon material with the lead precursor by adding a lead precursor to the carbon material dispersion solution;
obtaining a negative electrode active material by reducing the impregnated lead precursor to form lead nanoparticles in pores of the carbon material; and
washing and drying the negative electrode active material.

### Claim at position 7 (depends on 6)

7: The method of claim 6, wherein the impregnating comprises:
adding dropwise a predetermined amount of the lead precursor to the carbon material dispersion solution while primarily treating the carbon material dispersion solution with a stirrer and ultrasonic waves; and
obtaining a precursor solution by secondarily treating the dispersion solution having undergone the dropwise addition of the lead precursor, with a stirrer and ultrasonic waves.

### Claim at position 8 (depends on 6)

8: The method of claim 6, wherein the obtaining of the negative electrode active material comprises:
cooling the precursor solution obtained in the impregnation step to 0° C. to 10° C.;
adding a reducing agent to the cooled precursor solution; heating and stirring the precursor solution to which the reducing agent is added;
cooling the heated precursor solution to room temperature and then tertiarily treating the precursor solution with a stirrer and ultrasonic waves; and
maintaining and fixing the precursor solution tertiarily treated with a stirrer and ultrasonic waves at room temperature for a certain period of time.

### Claim at position 9 (depends on 8)

9: The method of claim 8, wherein the fixing is performed at room temperature and atmospheric or vacuum pressure.

### Claim at position 10 (depends on 6)

10: The method of claim 6, wherein the lead precursor is any one selected from the group consisting of lead nitrate (Pb(NO3)2), lead sulfate (PbSO4), lead chloride (PbCl2), lead acetate (Pb(CH3COO)2), lead chromate (Pb(CrO4)), lead bromide (PbBr2), and lead iodide (PbI2).

### Claim at position 11 (depends on 6)

11: The method of claim 6, wherein the porous carbon material is activated carbon or carbon nanotubes obtained by activating a raw material with KOH, NaOH, or both at a temperature of 100° C. to 3000° C. and then carbonizing the activated raw material at a temperature of 300° C. to 900° C.

### Claim at position 12 (depends on 8)

12: The method of claim 8, wherein the precursor solution to which the reducing agent is added contains the reducing agent in an amount of 0.01 to 5 M.

### Claim at position 13 (depends on 12)

13: The method of claim 12, wherein the reducing agent is any one selected from the group consisting of sodium borohydride, iron(ii) sulfate, lithium aluminum hydride, metal salts, and sulfur compounds.

### Claim at position 14 (depends on 1)

14: A negative electrode for at least one of a lead storage battery and a Pb/C battery, the negative electrode comprising the negative electrode active material of claim 1.

### Claim at position 15 (depends on 14)

15: A lead storage battery comprising the negative electrode of claim 14.

### Claim at position 16 (depends on 14)

16: A Pb/C battery comprising the negative electrode of claim 14.

### Claim at position 17 (depends on 6)

17: A negative electrode for at least one of a lead storage battery and a Pb/C battery, the negative electrode active material prepared by the method of any one of claim 6.

### Claim at position 18 (depends on 17)

18: A lead storage battery comprising the negative electrode of claim 17.

### Claim at position 19 (depends on 17)

19: A Pb/C battery comprising the negative electrode of claim 17.