Anode active material for secondary battery, manufacturing method thereof, and lithium secondary battery including the same

Patent metadata

Field	Value
Publication number	US-11424446-B2
Application number	US-201816182890-A
Country	US
Kind code	B2
Filing date	Nov 7, 2018
Priority date	Nov 8, 2017
Publication date	Aug 23, 2022
Grant date	Aug 23, 2022

Abstract

Provided are an anode active material for secondary battery which includes porous iron oxide nanoparticles, a manufacturing method thereof, and a secondary battery including the same. The anode active material for secondary battery of the present disclosure minimizes a volume change of iron oxide caused by intercalation and deintercalation of lithium even during consecutive charges and discharges and thus can improve the capacity and lifespan characteristics of a secondary battery employing the anode active material. Further, the manufacturing method of an anode active material for secondary battery makes it possible to manufacture an anode active material for secondary battery including iron oxide nanoparticles in an environmentally friendly and simple manner and thus makes it possible to mass-produce the anode active material.

First claim

What is claimed is:

1. A manufacturing method of an anode active material for secondary battery, the method comprising:
mixing an iron compound, a metal salt, and a solvent to prepare an iron-mixed solution; and
irradiating microwaves to the iron-mixed solution to form the anode active material through the self-assembly of spindle shaped iron oxide particles, wherein the iron-mixed solution has a concentration of from 0.01 M to 0.05 M; and
wherein the microwaves are irradiated to the iron-mixed solution having a temperature range of from 100° C. to 300° C., output power range of from 100 W to 600 W for 10 to 30 minutes, and
wherein the anode active material is formed into a porous structure and has a specific surface area of from 1 m2/g to 80 m2/g and an average particle diameter of from 400 nm to 800 nm.

2. The manufacturing method of an anode active material for secondary battery according to claim 1 , wherein the iron compound includes a member selected from the group consisting of iron(II) nitrate, iron(III) nitrate, iron(II) sulfate, iron(III) sulfate, iron(II) acetylacetonate, iron(III) acetylacetonate, iron(II) trifluoroacetylacetonate, iron(III) trifluoroacetylacetonate, iron(II) acetate, iron(III) acetate, iron(II) chloride, iron(III) chloride (FeCl 3 ), iron(II) bromide, iron(III) bromide, iron(II) iodide, iron(III) iodide, iron perchlorate, iron sulfamate, iron(II) stearate, iron(III) stearate, iron(II) oleate, iron(III) oleate, iron(II) laurate, iron(III) laurate, iron pentacarbonyl, iron enneacarbonyl, disodium tetracarbonyl ferrate, and mixtures thereof.

3. The manufacturing method of an anode active material for secondary battery according to claim 1 , wherein the metal salt includes a member selected from the group consisting of nitrate, carbonate, chloride salt, phosphate, borate, oxide, sulfonate, sulfate, stearate, myristate, acetate, acetylacetonate, hydrates thereof, and mixtures thereof.

4. The manufacturing method of an anode active material for secondary battery according to claim 1 , wherein the solvent includes a member selected from the group consisting of water, ethanol, isopropyl alcohol, propanol, butanol, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, polyethylene glycol, polypropylene glycol, and mixtures thereof.

5. The manufacturing method of an anode active material for secondary battery according to claim 1 , wherein the microwaves are irradiated at output power range of from 100 W to 600 W.

Assignees

• Korea Basic Science Inst

Inventors

• Kim Yeon Ho
• Kim Hae Jin
• Hong Won Gi
• Kim Jong Guk

Classifications

• H01M50/417

  Polyolefins · CPC title

• H01M50/426

  Fluorocarbon polymers · CPC title

• H01M4/525 Primary

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M4/523 Primary

  for non-aqueous cells (H01M4/525 takes precedence) · CPC title

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title