Positive electrode material for secondary battery and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-9385371-B2
Application number	US-201113214544-A
Country	US
Kind code	B2
Filing date	Aug 22, 2011
Priority date	May 31, 2011
Publication date	Jul 5, 2016
Grant date	Jul 5, 2016

Abstract

A positive electrode material for a secondary battery and a method for manufacturing the same are provided, in which manganese fluorophosphate containing lithium or sodium can be used as an electrode material. That is, a positive electrode material for a lithium/sodium battery is provided, in which intercalation/deintercalation of sodium/lithium ions is possible due to a short lithium diffusion distance caused by nanosizing of particles. Furthermore, a positive electrode material for a lithium/sodium battery is provided, which has electrochemical activity due to an increase in electrical conductivity by effective carbon coating.

First claim

What is claimed is:

1. A method for manufacturing a positive electrode material for a secondary battery having a particle size of about 1 to about 100 nm, exhibiting a potential plateau during discharge between about 3.7 to about 4.0 V, coated with carbon to improve conductivity and comprising a compound represented by [Formula 1], the method comprising:
pretreating a mixture which is formed by uniformly mixing a lithium (Li) oxide or a precursor thereof, and/or a sodium (Na) oxide or a precursor thereof, a manganese (Mn) oxide or a precursor thereof, a phosphorus (P) oxide or a precursor thereof, and as fluoride (F) or a precursor thereof using a mixing device; and
heat treating the mixture with a first carbon conductive material which is added to the mixture obtained after pretreating and uniformly mixed with the mixture using the mixing device, wherein the resulting mixture thereof is sintered:
[Formula 1] A x MnPO 4 F

wherein A is lithium (Li), sodium (Na), or a mixture thereof and 0<x≦2,
wherein in pretreating, the mixture is uniformly mixed using a ball mill for 6 hours and subjected to pretreatment under air atmosphere at 300° C. for 2 hours,
wherein the first carbon conductive material is citric acid.

2. The method of claim 1 , wherein heat treating comprises:
mixing the first carbon conductive material with the mixture obtained from pretreating and performing wet ball-milling;
collecting the resulting mixture after the wet ball-milling and sintering the resulting mixture under argon atmosphere; and
uniformly mixing the sintered mixture with a second carbon conductive material in a predetermined ratio and reheating thereof.

3. The method of claim 2 , wherein the sintered mixture is washed with water and dried, the sintered mixture is uniformly mixed with the second carbon conductive material, and reheating is performed at a temperature of about 200 to 500° C.

4. The method of claim 1 , wherein the precursor of the lithium oxide is lithium phosphate, lithium carbonate, lithium hydroxide, lithium acetate, lithium sulfate, lithium sulfite, lithium fluoride, lithium chloride, lithium bromide, lithium iodide, or a mixture thereof.

5. The method of claim 1 , wherein the precursor of the manganese oxide is manganese metal, manganese oxide, manganese oxalate, manganese acetate, manganese nitrate, or a mixture thereof.

6. The method of claim 1 , wherein the precursor of the phosphorus oxide is ammonium phosphate, sodium phosphate, potassium phosphate, or a mixture thereof.

7. The method of claim 1 , wherein the second carbon conductive material is citric acid, sucrose, Super-P, acetylene black, ketjen black, carbon, or a mixture thereof.

8. The method of claim 1 , wherein the mixing device is a ball mill.

Assignees

• Kim Dong Gun
• Kim Sa Heum
• Kim Young Jun
• Song Jun Ho
• Cho Woo Suk
• Kim Jeom Soo
• Hyundai Motor Co Ltd
• Korea Electronics Technology

Inventors

• Kim Dong Gun
• Kim Sa Heum
• Kim Young Jun
• Song Jun Ho
• Cho Woo Suk
• Kim Jeom Soo

Classifications

• Y02E60/122

  Cross-Sectional Technologies · mapped topic

• H01M4/5825 Primary

  Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title

• Y02P70/54

  Cross-Sectional Technologies · mapped topic

• H01M4/136

  Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy · CPC title

• H01M4/366

  as layered products · CPC title