US 2021/0202947 A1 · METHODS FOR PRODUCING OF COATED POSITIVE ELECTRODE ACTIVE MATERIAL AND LITHIUM-ION SECONDARY BATTERY AND LITHIUM-ION SECONDARY BATTERY

Abstract

A method for producing a positive electrode active material is provided. The method can prevent a gas generation due to an oxidative degradation of a non-aqueous electrolyte in a lithium-ion secondary battery using a positive electrode active material which operates at a high potential. A method for producing a coated positive electrode active material for a lithium-ion secondary battery includes coating a surface of a positive electrode active material with an oxide-based solid electrolyte by a mechanical coating method and then conducting heat treatment at 300° C. or higher, and the positive electrode active material has an average potential of extraction and insertion of lithium of 4.5V or more and 5.0V or less based on Li+/Li.

Claims6

Dependent claims

A method for producing a coated positive electrode active material for a lithium-ion secondary battery, the method comprising:

coating a surface of a positive electrode active material with an oxide-based solid electrolyte by a mechanical coating method and then
conducting heat treatment at 300° C. or higher,
wherein the positive electrode active material has an average potential of extraction and insertion of lithium of 4.5V or more and 5.0V or less based on Li+/Li,
wherein a diameter dBET determined from a BET specific surface area of the oxide-based solid electrolyte is 1 to 100 nm, and
wherein a ratio of a median diameter of the positive electrode active material to the diameter dBET determined from the BET specific surface area of the oxide-based solid electrolyte is 10000:1 to 100:1.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

17/192,975Filed 5 Mar 2021

Priority

JP 2018-1679787 Sep 2018

Published

1 Jul 2021

Term ends

Not estimatedThe source records don’t support an estimate.

Classification23 codes

C01B 25/45
Phosphates: containing plural metal, or metal and ammonium
H01M 4/62
Electrodes composed of, or comprising, active material: selection of inactive substances as ingredients for active masses, e.g. binders, fillers
C01G 53/54
Containing manganese: of the type -, e.g. LiO4 or LiO4
H01M 4/0402
Processes of manufacture in general: methods of deposition of the material

Methods for producing of coated positive electrode active material and lithium-ion secondary battery and lithium-ion secondary battery

Life of this patent

Methods for producing of coated positive electrode active material and lithium-ion secondary battery and lithium-ion secondary battery

Life of this patent

Abstract

Claims6