Secondary battery, battery pack and car
AssigneeKabushiki Kaisha Toshiba
InventorsNorio TAKAMI, Hiroki INAGAKI, Takashi KUBOKI
Life of this patent
Estimating the term…
Abstract
A secondary battery includes a positive electrode, a negative electrode containing a metal compound having a lithium ion absorption potential of 0.2V (vs. Li/Li+) or more, a separator and a nonaqueous electrolyte. The separator is provided between the positive electrode and the negative electrode. The separator comprises cellulose fibers and pores having a specific surface area of 5 to 15 m2/g. The separator has a porosity of 55 to 80%, and a pore diameter distribution having a first peak in a pore diameter range of 0.2 μm (inclusive) to 2 μm (exclusive) and a second peak in a pore diameter range of 2 to 30 μm.
Claims1
A secondary battery comprising:
- a positive electrode;
- a negative electrode containing a metal compound having a lithium ion absorption potential of 0.2V (vs. Li/Li+) or more;
- a separator which is provided between the positive electrode and the negative electrode, comprises cellulose fibers and pores having a specific surface area of 5 to 15 m2/g, and has a porosity of 55 to 80% and a pore diameter distribution having a first peak in a pore diameter range of 0.2 μm (inclusive) to 2 μm (exclusive) and a second peak in a pore diameter range of 2 to 30 μm;
- and
- a nonaqueous electrolyte.
Dependencies are inferred from the claim text.