US12573623USUSPTO Grant XML

Nonaqueous electrolyte secondary battery

A nonaqueous electrolyte secondary battery according to one embodiment of the present disclosure is provided with a positive electrode, a negative electrode and a nonaqueous electrolyte; the positive electrode contains a lithium transition metal composite oxide that contains Ni, Nb and M (M is at least one element selected from among Ca and Sr), said lithium transition metal composite oxide optionally containing Co; the contents of Ni, Nb, M and Co in the lithium transition metal composite oxide are respectively within specific ranges; the negative electrode comprises a negative electrode mixture layer that contains a negative electrode active material, and a coating film that is formed on the surface of the negative electrode mixture layer, while containing Nb and M; and the contents of Nb and M in the negative electrode are respectively within specific ranges.

Patent

Brief

Patent brief

Problem

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

Novelty

Fire-resistant electrolytes is reinforced by front-page matches on electrolyte.

Uses

Lithium-ion cells, EV batteries, Grid storage

Assignee

PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.

Published

Mar 10, 2026

Inventors

Takaya Tochio, Takeshi Ogasawara

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 one embodiment of the present disclosure is provided with a positive electrode, a negative electrode and a nonaqueous electrolyte; the positive electrode contains a lithium transition metal composite oxide that contains Ni, Nb and M (M is at least one element selected from among Ca and Sr), said lithium transition metal composite oxide optionally containing Co; the contents of Ni, Nb, M and Co in the lithium transition metal composite oxide are respectively within specific ranges; the negative electrode comprises a negative electrode mixture layer that contains a negative electrode active material, and a coating film that is formed on the surface of the negative electrode mixture layer, while containing Nb and M; and the contents of Nb and M in the negative electrode are respectively within specific ranges.

Key novelty

Fire-resistant electrolytes is reinforced by front-page matches on electrolyte.

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 lithium-transition metal composite oxide containing Ni, Nb, M (M represents at least one element selected from the group consisting of Ca and Sr), and Co that is an optional component, wherein, in the lithium-transition metal composite oxide, a content rate of Ni is greater than or equal to 80 mol % based on a total number of moles of metal elements excluding Li, a content rate of Nb is less than or equal to 0.35 mol % based on the total number of moles of metal elements excluding Li, a content rate of M is less than or equal to 1 mol % based on the total number of moles of metal elements excluding Li, a content rate of Co is less than or equal to 5 mol % based on the total number of moles of metal elements excluding Li, wherein the negative electrode has a negative electrode mixture layer including a negative electrode active material, and a coating containing Nb and M formed on a surface of the negative electrode mixture layer, wherein, in the negative electrode, a content rate of Nb is greater than or equal to 10 ppm and less than or equal to 3000 ppm based on a total mass of the negative electrode mixture layer and the coating, and a content rate of M is greater than or equal to 10 ppm and less than or equal to 3000 ppm based on the total mass of the negative electrode mixture layer and the coating. 2 . The non-aqueous electrolyte secondary battery according to claim 1 , wherein the lithium-transition metal composite oxide contains less than or equal to 2 mol % of Co based on the total number of moles of metal elements excluding Li, or contains substantially no Co. 3 . The non-aqueous electrolyte secondary battery according to claim 1 , wherein the content rate of Ni in the lithium-transition metal composite oxide is greater than or equal to 85 mol % based on the total number of moles of metal elements excluding Li.

Linked approaches

Fire-resistant electrolytes

Electrolyte formulations that suppress ignition and heat release.

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