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US 2023/0054947 A1Published application
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
AssigneeIndustry Foundation of Chonnam National University
InventorsHo Young JUNG, Sadhasivam THANGARASU
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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.
Claims19
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.
1 more element
2:
- The negative electrode active material of claim 1, wherein the porous carbon material is an activated carbon or carbon nanotubes.
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.
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.
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.
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.
3 more elements
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.
1 more element
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.
4 more elements
9:
- The method of claim 8, wherein the fixing is performed at room temperature and atmospheric or vacuum pressure.
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).
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.
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.
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.
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.
15:
- A lead storage battery comprising the negative electrode of claim 14.
16:
- A Pb/C battery comprising the negative electrode of claim 14.
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.
18:
- A lead storage battery comprising the negative electrode of claim 17.
19:
- A Pb/C battery comprising the negative electrode of claim 17.