Nonaqueous electrolyte battery, battery pack and vehicle
AssigneeKabushiki Kaisha Toshiba
InventorsYumi Fujita, Hiroki Inagaki, Hidesato Saruwatari, Norio Takami
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Abstract
A nonaqueous electrolyte battery includes a positive electrode, a negative electrode, a separator and a nonaqueous electrolyte. The negative electrode contains a negative electrode active material having a Lithium ion insertion potential of 0.4 V (vs. Li/Li+) or more. The separator is provided between the positive electrode and the negative electrode. The separator has a porosity of 50% or more and a pore diameter distribution in which a median diameter is larger than a mode diameter. The porosity and the pore diameter distribution are measured by mercury porosimetry. A surface roughness of the negative electrode is larger than the mode diameter.
Claims20
A nonaqueous electrolyte battery comprising:
- a positive electrode comprising a positive electrode current collector, and a positive electrode active material-containing layer provided on the positive electrode current collector and having a surface roughness Ra from 0.1 μm to 0.6 μm;
- a negative electrode comprising a negative electrode active material having a Lithium ion insertion potential of 0.4 V (vs. Li/Li+) or more;
- a separator which is provided between the positive electrode and the negative electrode, and has a porosity of 50% or more and a pore diameter distribution in which a median diameter is larger than a mode diameter, wherein the porosity and the pore diameter distribution are measured by mercury porosimetry, and a surface roughness Ra of the negative electrode is larger than the mode diameter;
- and
- a nonaqueous electrolyte.
A battery pack comprising a nonaqueous electrolyte battery, wherein the nonaqueous electrolyte battery comprises:
- a positive electrode comprising a positive electrode current collector, and a positive electrode active material-containing layer provided on the positive electrode current collector and having a surface roughness Ra from 0.1 μm to 0.6 μm;
- a negative electrode comprising a negative electrode active material having a Lithium ion insertion potential of 0.4 V (vs. Li/Li+) or more;
- a separator which is provided between the positive electrode and the negative electrode, and has a porosity of 50% or more and a pore diameter distribution in which a median diameter is larger than a mode diameter, and the porosity and the pore diameter distribution are measured by mercury porosimetry, and a surface roughness Ra of the negative electrode is larger than the mode diameter;
- and
- a nonaqueous electrolyte.
Dependencies are inferred from the claim text.