# US 10,500,610 B2 · Method for producing active material composite

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- Number: US 10,500,610 B2
- Document ID: US10500610B2
- Status: Granted
- Kind: B2
- Application number: 15/366,127
- Filed: 2016-12-01
- Published: 2017-06-08
- Granted: 2019-12-10
- Earliest claimed: 2015-12-04
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Takayuki Uchiyama
- Web page: https://patentgrep.com/patent/US10500610B2

## CPC

- B05D 3/0254: {After-treatment}
- B05D 1/02: performed by spraying
- H01M 4/0419: {involving spraying}
- H01M 4/139: Processes of manufacture
- H01M 4/366: {as layered products}
- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M 4/1391: of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0562: Solid materials
- Y02E 60/10: Energy storage using batteries
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A method for producing an active material composite for all-solid-state lithium secondary batteries, the active material composite having a lithium niobate-containing coating layer on an active material surface, and the production method being able to decrease the content of a nitrogen element derived from a niobic acid raw material in the coating layer of the active material composite thus produced, and to decrease the reaction resistance of an all-solid-state lithium battery using the active material composite. The active material composite production method may comprise: preparing a coating liquid containing a peroxo complex of niobium and a lithium element, by use of a niobic acid in which a content of a nitrogen element contained as an impurity is 0.1% by mass or less, and forming the lithium niobate-containing coating layer on the active material surface by use of the coating liquid.

## Claims

### Claim 1

A method for producing an active material composite for all-solid-state lithium secondary batteries, the active material composite having a lithium niobate-containing coating layer on an active material surface,
wherein the method comprises:
preparing a coating liquid containing a peroxo complex of niobium and a lithium element, by use of a water-soluble niobic acid having formula Nb2O5·nH2O and in which a content of a nitrogen element contained as an impurity is 0.1% by mass or less and a ratio of the Nb2O5 to water in the water-soluble niobic acid is 77:17 by mass, and
forming the lithium niobate-containing coating layer on the active material surface by use of the coating liquid.

### Claim 2 (depends on 1)

The method for producing the active material composite according to claim 1, wherein the water-soluble niobic acid having the formula Nb2O5·nH2O in which the content of the nitrogen element contained as an impurity is 0.1% by mass or less, a hydrogen peroxide solution, a lithium hydroxide and an aqueous ammonia solution are used in the preparing of the coating liquid.