Nonaqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-9748575-B2
Application number	US-201614988862-A
Country	US
Kind code	B2
Filing date	Jan 6, 2016
Priority date	Feb 27, 2015
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

A nonaqueous electrolyte secondary battery includes a positive electrode that includes a positive electrode current collector, an intermediate layer on the positive electrode current collector, and a positive electrode mix layer on the intermediate layer. The intermediate layer contains a flame retardant and a conductive material having a heat conductivity of 10 W/m·K or more.

First claim

What is claimed is:

1. A nonaqueous electrolyte secondary battery comprising:
a positive electrode;
a negative electrode; and
a nonaqueous electrolyte,
wherein the positive electrode includes
a positive electrode current collector,
an intermediate layer on the positive electrode current collector, the intermediate layer containing a flame retardant and a heat conductive material having a heat conductivity of 10 W/m·K or more, and
a positive electrode mix layer on the intermediate layer.

2. The nonaqueous electrolyte secondary battery according to claim 1 , wherein the heat conductive material is at least one selected from the group consisting of diamond, graphite, aluminum nitride, silicon carbide, aluminum oxide, and tungsten oxide.

3. The nonaqueous electrolyte secondary battery according to claim 1 , wherein the flame retardant is at least one selected from the group consisting of an aromatic phosphate ester and a melamine-acid salt.

4. The nonaqueous electrolyte secondary battery according to claim 1 , wherein the flame retardant is contained in a ratio of 0.5% to 3% by weight relative to a weight of a positive electrode active material per unit area.

5. The nonaqueous electrolyte secondary battery according to claim 1 , wherein the flame retardant is contained in a ratio of 1% to 70% by weight relative to a weight of the intermediate layer.

6. The nonaqueous electrolyte secondary battery according to claim 1 , wherein the heat conductive material contains graphite and aluminum oxide.

Assignees

• Panasonic Corp

Inventors

• Sugita Yasunari
• Endo Kazuki
• Shiozaki Tomoki

Classifications

• H01M4/667

  in the form of layers, e.g. coatings · CPC title

• H01M4/13 Primary

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title

• H01M10/4235

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

• H01M4/62 Primary

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M10/052

  Li-accumulators · CPC title