Cathode material for sulfide-based all-solid-state batteries, manufacturing method thereof, and all-solid-state battery using the same

Patent metadata

Field	Value
Publication number	US-2025112236-A1
Application number	US-202418977188-A
Country	US
Kind code	A1
Filing date	Dec 11, 2024
Priority date	May 12, 2022
Publication date	Apr 3, 2025
Grant date	—

Abstract

A cathode material for sulfide-based all-solid-state batteries, in which Li3V2(PO4)3 (LVP) is doped with a transition metal having an oxidation number of +5 or more and the surface of the cathode material is substituted with a halogen element so as to have improved surface stability and energy density and to suppress side reactions with a solid electrolyte, a manufacturing method thereof, and an all-solid-state battery using the same.

First claim

1 . A manufacturing method of a cathode material for all-solid-state batteries, comprising:
preparing a mixture comprising a lithium (Li) precursor, a vanadium (V) precursor and a Me precursor; stirring the mixture; firing stirred mixture and forming the fired mixture into a pellet; primarily calcining the pellet; substituting a surface of a calcined result with an A precursor to obtain an intermediate; and secondarily calcining the intermediate, wherein the cathode material comprises a compound represented by:
Li a V 2-x Me x (PO 4 ) y A z ,
wherein Me comprises one selected from the group consisting of tungsten (W), niobium (Nb), tantalum (Ta), molybdenum (Mo) and combinations thereof, A comprises one selected from the group consisting of fluorine (F), chlorine (Cl), bromine (Br) and combinations thereof, and 2.0<a≤3.5, 0<x≤2.0, 3.0<y≤3.5, and 0<z≤1.

2 . The manufacturing method of claim 1 , wherein:
M comprises tungsten (W); A comprises chlorine (Cl); and 2.8<a≤3.2, 0<x≤0.5, and 0<z≤0.5.

3 . The manufacturing method of claim 1 , wherein a ratio of the lithium precursor to sum of the vanadium precursor and the Me precursor is about 1.4 to 1.8.

4 . The manufacturing method of claim 1 , wherein the stirred mixture is fired at a temperature of about 300° C. to 500° C. for about 4 hours to 8 hours in an atmosphere, and is pressed at a pressure of about 20 MPa to 50 MPa.

5 . The manufacturing method of claim 1 , wherein the pellet is primarily calcined at a temperature of about 500° C. to 1,000° C. for about 5 hours to 24 hours in an argon atmosphere.

6 . The manufacturing method of claim 1 , wherein the compound comprises at least one from the group consisting of a primary particle, a secondary particle, and combinations thereof;
the primary particle comprises a single particle; and the secondary particle comprises an agglomerate of the primary particles.

7 . The manufacturing method of claim 6 , wherein the primary particle has an average particle diameter (D 50 ) of 0.5 μm to 10 μm, and the secondary particle has an average particle diameter (D 50 ) of about 1 μm to 20 μm.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp

Inventors

• Seo Im Sul
• Lee Sang Heon
• Noh Sung Woo
• Seo Jeong Hyun
• Lim Chung Bum
• Seong Ju Yeong
• Park Je Sik

Classifications

• C01P2006/40

  Electric properties · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title

• C01P2004/62

  Submicrometer sized, i.e. from 0.1-1 micrometer · CPC title

• C01P2004/50

  Agglomerated particles · CPC title

• C01P2002/50

  Solid solutions · CPC title