US 9,809,456 B2 · Manufacturing method for positive electrode active material

Abstract

It is an object to provide a manufacturing method for a large amount of positive electrode active material with few variations, having a highly uniform surface condition, micro-size, and high performance. An aqueous solution of a compound, which becomes the source material for the positive electrode active material, is put in an airtight container and irradiated with microwaves, thus heating while water in the airtight container is evaporated and a high pressure is formed in the air tight container. A large amount of micro-sized positive electrode active material having a highly uniform surface condition can be formed. A compound, which becomes the source material for the positive electrode active material, is put in an airtight container and irradiated with microwaves, thus heating while water in the airtight container is evaporated and a high pressure is formed in the air tight container.

Claims8

Dependent claims

A method of manufacturing a positive electrode active material, comprising the steps of:

providing a solid in an airtight container which is configured to transmit a microwave, the solid consisting essentially of:
a transition metal compound;
a compound including lithium;
and
a phosphate, wherein at least one of the transition metal compound, the compound including lithium and the phosphate is a hydrate,
directly irradiating the solid with a microwave to evaporate water in the hydrate, thereby increasing pressure in the airtight container and synthesizing a lithium transition metal phosphate by hydrothermal reaction;
after the irradiating, preparing a battery comprising a positive electrode comprising the solid, a negative electrode, and an electrolyte comprising a sodium salt;
applying a voltage to the battery;
and
performing a sodium-lithium ion replacement of the solid in the battery.

7 more elements

Dependencies are inferred from the claim text.

Manufacturing method for positive electrode active material

Life of this patent

Manufacturing method for positive electrode active material

Life of this patent

Abstract

Claims8