US12573637USUSPTO Grant XML

Nonaqueous electrolyte secondary battery

A nonaqueous electrolyte secondary battery according to an embodiment of the present disclosure comprises a positive electrode, a negative electrode, and a nonaqueous electrolyte. The positive electrode has: a positive electrode current collector; and a positive electrode active material layer that is provided to the surface of the positive electrode current collector and includes a positive electrode active material and a positive electrode additive. The positive electrode active material contains a lithium-nickel composite oxide having a compressive breaking strength of at least 130 MPa and including at least 50 mol % of nickel relative to the total quantity of metals other than lithium. The positive electrode additive contains a lithium-containing metal oxide that has an antifluorite structure.

Patent

Brief

Patent brief

Problem

How can battery fires and thermal runaway in EV packs be prevented?

Novelty

The positive electrode has: a positive electrode current collector; and a positive electrode active material layer that...

Uses

Lithium-ion cells, EV batteries, Grid storage

Assignee

PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.

Published

Mar 10, 2026

Inventors

Ryo Kazama, Yuta Kuroda, Manabu Takijiri

Domain

Mobility / storage

Plain-English summary

Problem

How can battery fires and thermal runaway in EV packs be prevented?

Solution

nonaqueous electrolyte secondary battery according to an embodiment of the present disclosure comprises a positive electrode, a negative electrode, and a nonaqueous electrolyte.

Key novelty

The positive electrode has: a positive electrode current collector; and a positive electrode active material layer that is provided to the surface of the positive electrode current collector and includes a positive electrode active material and a positive electrode additive.

Applications

Lithium-ion cellsEV batteriesGrid storage

Relevant search intents

electrolyte

Claims preview

1 . A non-aqueous electrolyte secondary battery comprising: a positive electrode; a negative electrode; and a non-aqueous electrolyte; wherein the positive electrode includes a positive electrode current collector and a positive electrode active material layer which is provided on a surface of the positive electrode current collector and which includes a positive electrode active material and a positive electrode additive, the positive electrode active material includes 50 mol % or more of nickel based on a total amount of a metal other than lithium and contains a lithium/nickel complex oxide having a compressive fracture strength of 130 MPa or more, and the positive electrode additive contains a lithium-containing metal oxide having an antifluorite structure, the lithium-containing metal oxide includes at least one selected from the group consisting of lithium/iron oxide, lithium/copper oxide, and lithium/manganese oxide, wherein the lithium/iron oxide includes one or more oxides selected from the group consisting of Li 3 Fe 5 O 8 , and Li 5 Fe 5 O 8 . 2 . The non-aqueous electrolyte secondary battery according to claim 1 , wherein a content of the positive electrode additive relative to the positive electrode active material layer is 0.5 mass % or more and 5 mass % or less. 3 . The non-aqueous electrolyte secondary battery according to claim 1 , wherein the lithium-containing metal oxide further includes Li 2 Fe 3 O 5 , Li 2 Fe 3 O 4 , Li 5 FeO 4 , LiFeO 2 , or LiFe 5 O 8 .

Linked approaches

Fire-resistant electrolytes

Electrolyte formulations that suppress ignition and heat release.

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