Method for making cathode active material of lithium ion battery

Patent metadata

Field	Value
Publication number	US-9923204-B2
Application number	US-201615243723-A
Country	US
Kind code	B2
Filing date	Aug 22, 2016
Priority date	Feb 26, 2014
Publication date	Mar 20, 2018
Grant date	Mar 20, 2018

Abstract

A method for making a cathode active material of a lithium ion battery is disclosed. In the method, LiMPO 4 particles and LiNPO 4 particles are provided. The LiMPO 4 particles and LiNPO 4 particles both are olivine type crystals belonged to a pnma space group of an orthorhombic crystal system, wherein M represents Fe, Mn, Co, or Ni, N represents a metal element having a +2 valence, and N is different from M. The LiMPO 4 particles and the LiNPO 4 particles are mixed together to form a precursor. The precursor is calcined to form LiM x N 1-x PO 4 particles, wherein 0<x<1.

First claim

What is claimed is:

1. A method for making a cathode active material of a lithium ion battery, the method comprising:
providing LiMPO 4 particles and LiNPO 4 particles both being olivine type crystals belonging to a pnma space group of an orthorhombic crystal system, wherein M represents Fe, Mn, Co, or Ni, N represents a metal element having a +2 valence, and N is different from M;
mixing the LiMPO 4 particles and the LiNPO 4 particles together to form a precursor; and
calcining the precursor to form LiM x N 1-x PO 4 particles, wherein 0<x<1.

2. The method of claim 1 , wherein both the LiMPO 4 particles and the LiNPO 4 particles are nanosized particles.

3. The method of claim 1 , wherein shapes of the LiMPO 4 particles and the LiNPO 4 particles are at least one of spheres, rods, and sheets.

4. The method of claim 1 , wherein both the LiMPO 4 particles and the LiNPO 4 particles are sheet shaped.

5. The method of claim 1 , wherein both the LiMPO 4 particles and the LiNPO 4 particles are nanosheets.

6. The method of claim 1 , wherein the LiMPO 4 particles and the LiNPO 4 particles have a same morphology and a same size.

7. The method of claim 1 , wherein both the LiMPO 4 particles and the LiNPO 4 particles are nanosheets with a same size.

8. The method of claim 1 , wherein N is selected from the group consisting of Fe, Mn, Co, Ni, Mg, Ca, Zn, Cu, Al, B, Cr, Nb, Sc, Ti, V, Be, Sr, Ba, Zr, and La.

9. The method of claim 1 , wherein N is selected from the group consisting of Mg, Ca, Zn, Cu, Al, B, Cr, Nb, Sc, Ti, V, Be, Sr, Ba, Zr, and La, and a ratio of the LiMPO 4 particles to the LiNPO 4 particles is set to have x>0.9.

10. The method of claim 1 , wherein the LiMPO 4 particles and the LiNPO 4 particles are uniformly mixed to form the precursor.

11. The method of claim 1 further comprising a step of adding a carbon source into the precursor before calcining the precursor to form LiM x N 1-x PO 4 particles.

12. The method of claim 1 , wherein a weight of the carbon source is 5% to 15% of a total weight of the LiMPO 4 particles and the LiNPO 4 particles.

13. The method of claim 1 , wherein the carbon source is selected from the group consisting of sucrose, glucose, Span 80, phenolic resin, epoxy resin, furan resin, polyacrylic acid, polyacrylonitrile, polyethylene glycol, polyvinyl alcohol, and combinations thereof.

14. The method of claim 1 , wherein the calcining occurs at a temperature range from about 300° C. to about 1200° C.

15. The method of claim 14 , wherein the temperature range is from about 500° C. to about 1000° C.

16. The method of claim 1 , wherein the calcining is processed in an inert gas.

Assignees

• Jiangsu Huadong Inst Of Li Ion Battery Co Ltd
• Univ Tsinghua

Inventors

• Dai Zhong-Jia
• He xiang-ming
• Wang Li
• Li Jian-Jun
• Shang yu-ming
• Gao Jian
• Wang yao-wu

Classifications

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/5825 Primary

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

• H01M4/364

  as mixtures · CPC title

• H01M4/136

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

• H01M2004/028

  Positive electrodes · CPC title