Electrode material for nonaqueous electrolyte battery, electrode for nonaqueous electrolyte battery, nonaqueous electrolyte battery including the same, and battery pack
An electrode material for a nonaqueous electrolyte battery that includes a composite particle that contains a silicon dioxide particle having an average primary particle size of D 1 , a silicon particle having an average primary particle size of D 2 , and a carbon material, where D 1 is 5 nm or more and 80 nm or less and the ratio D 2 /D 1 is 0.3 or more and 8 or less.
1. An electrode material for a nonaqueous electrolyte battery comprising:
a composite particle, wherein the composite particle comprises a silicon dioxide particle having an average primary particle size of D 1 , a silicon particle having an average primary particle size of D 2 , and a carbon material,
wherein the D 1 is 5 nm or more and 80 nm or less,
wherein a ratio D 2 /D 1 is 0.3 or more and 8 or less,
wherein the silicon dioxide particles and the silicon particles are coated with the carbon material, and
wherein the whole of the surface of the silicon dioxide particle and the silicon particle is coated with the carbon material, or a part thereof is exposed on the surface of the electrode material, wherein the silicon dioxide and the silicon particle exist independently.
2. The electrode material according to claim 1 , wherein a content of the silicon particle in the composite particle is 1 mass % or more and 20 mass % or less.
3. The electrode material according to claim 1 , wherein the silicon dioxide particle is a particle mainly having an amorphous phase, and the silicon particle is a particle partially having a crystalline phase.
4. The electrode material according to claim 1 , wherein the composite particle has a silicon carbide phase.
5. An electrode for a nonaqueous electrolyte battery comprising:
a current collector; and
an electrode mixture layer that is formed on the current collector and contains the electrode material according to claim 1 , an electroconductive material and a binder.
6. A nonaqueous electrolyte battery comprising:
a positive electrode containing a positive electrode active material;
the negative electrode formed of the electrode according to claim 5 ; and
a nonaqueous electrolyte.
7. A battery pack comprising the nonaqueous electrolyte battery according to claim 6 .
8. The battery pack according to claim 7 further comprising:
a protective circuit; and
an external terminal for energization.
9. The battery pack according to claim 7 , wherein the nonaqueous electrolyte batteries are connected in series, in parallel or with a combination of series connection and parallel connection.