Lithium niobate and method for producing the same

Patent metadata

Field	Value
Publication number	US-11901558-B2
Application number	US-202117566054-A
Country	US
Kind code	B2
Filing date	Dec 30, 2021
Priority date	Aug 29, 2018
Publication date	Feb 13, 2024
Grant date	Feb 13, 2024

Abstract

A lithium niobate with high lithium ion conductivity. Disclosed is a method for producing a lithium niobate for use in a covering layer covering at least part of a surface of cathode active material particles, the method comprising: preparing a solution containing niobium ions and lithium ions, drying the solution to obtain a lithium niobate precursor, and heating the lithium niobate precursor at a temperature of from 250° C. to 300° C. for a heating time of more than 0 minute and 10 minutes or less.

First claim

The invention claimed is:

1. A method for producing an all-solid-state battery,
the method comprising:
preparing a solution containing niobium ions and lithium ions,
drying the solution to obtain a lithium niobate precursor, and
obtaining a lithium niobate by heating the lithium niobate precursor at a temperature of from 250° C. to 300° C. for a heating time of more than 0 minute and 10 minutes or less, and
wherein an A/B ratio value of the lithium niobate between a first peak intensity value A at a diffraction angle (2θ) of 23.7°±0.5° and a second peak intensity value B at a diffraction angle (2θ) of 53.2°±0.5°, is 1.96 or more and 2.54 or less, and the peak intensities are observed by X-ray diffraction (XRD) measurement using CuKα radiation;
wherein the all-solid-state battery comprises a cathode comprising a cathode layer, an anode comprising an anode layer, and a solid electrolyte layer disposed between the cathode layer and the anode layer;
wherein the cathode layer contains composite active material particles;
wherein the composite active material particles are composed of cathode active material particles and a covering layer;
wherein the covering layer contains the lithium niobate and covering at least part of the surface of the cathode active material particles;
wherein the solid electrolyte layer contains a sulfide-based solid electrolyte; and
wherein the sulfide-based solid electrolyte contains 10LiI-15LiBr-37.5Li 3 PS 4 as a raw material composition.

Assignees

• Toyota Motor Co Ltd

Inventors

• Sugiura Koichi
• Miki Nariaki
• Muraishi Kazuki
• Matsuo Kengo

Classifications

• H01M4/62 Primary

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

• C01G33/00 Primary

  Compounds of niobium · CPC title

• H01M4/366

  as layered products · CPC title

• H01M10/0525

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

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title