Lithium-ion battery containing electrolyte including capacity restoration additives and method for restoring capacity of lithium-ion battery

Patent metadata

Field	Value
Publication number	US-11316196-B2
Application number	US-201916703953-A
Country	US
Kind code	B2
Filing date	Dec 5, 2019
Priority date	Dec 21, 2018
Publication date	Apr 26, 2022
Grant date	Apr 26, 2022

Abstract

(A) A first lithium-ion battery is prepared. (B) A capacity loss of the first lithium-ion battery is detected. (C) Capacity restoration treatment is performed on the first lithium-ion battery having a detected capacity loss to produce a second lithium-ion battery. The first lithium-ion battery includes at least a positive electrode, a negative electrode, and an electrolyte solution. The electrolyte solution contains a lithium salt, a solvent, and an additive in advance of the detecting a capacity loss. The additive has an oxidation potential. The oxidation potential is higher than an OCP of the positive electrode in the first lithium-ion battery having a state of charge of 100%. The capacity restoration treatment involves charging the first lithium-ion battery in such a way that at least part of the additive is oxidized.

First claim

What is claimed is:

1. A method of producing a lithium-ion battery, comprising at least:
preparing a first lithium-ion battery;
detecting a capacity loss of the first lithium-ion battery; and
performing capacity restoration treatment on the first lithium-ion battery having a detected capacity loss to produce a second lithium-ion battery,
the first lithium-ion battery including at least a positive electrode, a negative electrode, and an electrolyte solution,
the electrolyte solution containing, in advance of the detecting a capacity loss, each of a lithium salt, a solvent, and an additive,
the additive having an oxidation potential,
the oxidation potential being higher than an open circuit potential of the positive electrode in the first lithium-ion battery having a state of charge of 100%,
the capacity restoration treatment involving charging the first lithium-ion battery in such a way that at least part of the additive is oxidized,
the additive consists of a plurality of components,
the plurality of components are different from each other in the oxidation potential,
the plurality of components including 2-methoxynaphthalene.

2. The method of producing a lithium-ion battery according to claim 1 , wherein
the plurality of components includes a first part and a second part,
the capacity restoration treatment involves charging the first lithium-ion battery in such a way that the first part of the plurality of components is oxidized and the second part of the plurality of components is not oxidized.

3. The method of producing a lithium-ion battery according to claim 1 , wherein
the capacity restoration treatment includes charging the first lithium-ion battery such that a positive electrode potential reaches the oxidation potential of the additive.

4. A lithium-ion battery comprising at least:
a positive electrode;
a negative electrode; and
an electrolyte solution,
the electrolyte solution containing a lithium salt, a solvent, and an additive,
the additive consisting of a plurality of components,
the plurality of components being different from each other in oxidation potential,
the plurality of components including 2-methoxynaphthalene.

Assignees

• Toyota Motor Co Ltd

Inventors

• Uchida Satomi
• Okayama Shinobu

Classifications

• H01M10/48

  Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569) · CPC title

• H01M10/0525 Primary

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

• H01M10/4235

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title

• H01M10/058 Primary

  Construction or manufacture · CPC title

• H01M2300/0025

  Organic electrolyte · CPC title