Nonaqueous electrolyte secondary battery
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.
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.