Positive electrode active material particle for sulfide-based all-solid-state batteries

Patent metadata

Field	Value
Publication number	US-11575116-B2
Application number	US-201916361740-A
Country	US
Kind code	B2
Filing date	Mar 22, 2019
Priority date	Mar 22, 2019
Publication date	Feb 7, 2023
Grant date	Feb 7, 2023

Abstract

A method of treating the surface of a positive electrode active material that is capable of inhibiting a reaction at the interface between a sulfide-based solid electrolyte and the positive electrode active material. A positive electrode active material particle for sulfide-based all-solid-state batteries, the surface of which is reformed, using the method and a sulfide-based all-solid-state battery, the charge/discharge characteristics of which are improved, including the same are also disclosed. The positive electrode active material particle for sulfide-based all-solid-state batteries manufactured using a dry-type method exhibits larger capacity than a positive electrode active material particle for sulfide-based all-solid-state batteries manufactured through a conventional wet-type process. In addition, the manufacturing process is simplified, and the amount of byproducts is reduced.

First claim

The invention claimed is:

1. A method of manufacturing a positive electrode active material particle for sulfide-based all-solid-state batteries, the method comprising
mixing and thermally treating a dried positive electrode active material particle and dried boron to produce the positive electrode active material particle.

2. The method according to claim 1 , wherein the dried positive electrode active material particle has a moisture content of 100 ppm or less.

3. The method according to claim 2 , further comprising prior to mixing and thermally treating, washing a first positive electrode active material particle with water in order to remove impurities therefrom to produce a washed positive electrode active material particle; and then drying the washed positive electrode active material particle to produce the dried positive electrode active material particle.

4. The method according to claim 1 , wherein the thermal treatment is performed at a temperature of 200° C. to 650° C.

5. The method according to claim 4 , wherein the thermal treatment is performed at a temperature of 250° C. to 350° C. for 5 hours.

6. The method according to claim 1 , wherein the dried positive electrode active material particle and the dried boron are mixed at a weight ratio of 1000:1 to 10:1.

7. The method according to claim 1 , wherein the positive electrode active material particle comprises at least one selected from a group consisting of a lithium manganese composite oxide; a lithium cobalt oxide; a lithium nickel oxide; a compound substituted with one or more transition metals; a lithium manganese oxide represented by the chemical formula Li 1+x Mn 2−x O 4 where x=0 to 0.33; a lithium manganese oxide; a lithium copper oxide; a vanadium oxide; an Ni-sited lithium nickel oxide represented by the chemical formula LiNi 1−x M x O 2 where M=Co, Mn, Al, Cu, Fe, Mg, B, or Ga, and x=0.01 to 0.3; a lithium manganese composite oxide represented by the chemical formula LiMn 2−x M x O 2 where M=Co, Ni, Fe, Cr, Zn, or Ta, and x=0.01 to 0.1 or the chemical formula Li 2 Mn 3 MO 8 where M=Fe, Co, Ni, Cu, or Zn; LiMn 2 O 4 in which a portion of Li in a chemical formula is replaced by alkaline earth metal ions; a disulfide compound; Fe 2 (MoO 4 ) 3 ; and derivatives thereof.

8. The method according to claim 1 , wherein a lithium boron oxide (LBO) coating layer comprising a mixture of LiBO 2 and Li 2 B 4 O 7 is formed on a surface of the positive electrode active material particle through the thermal treatment.

9. A positive electrode active material particle for sulfide-based all-solid-state batteries manufactured using the method according to claim 1 .

10. A positive electrode for a sulfide-based all-solid-state battery comprising
the positive electrode active material particle according to claim 9 .

11. A sulfide-based all-solid-state battery comprising
the positive electrode according to claim 10 .

Assignees

• Lg Chemical Ltd
• Univ California
• Lg Energy Solution Ltd

Inventors

• Jo Chi Ho
• Jung Wang Mo
• Lee Dong Hun
• Meng Ying Shirley
• Banerjee Abhik
• Zhang Minghao

Classifications

• H01M4/1391

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

• H01M4/525

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

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title

• H01M10/0562

  Solid materials · CPC title