Back to results
US 10,950,892 B2Granted
Nonaqueous electrolyte secondary battery
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsHiroyuki Akita, Harunari Shimamura
Life of this patent
Estimating the term…
Abstract
A nonaqueous electrolyte secondary battery (10) includes a porous film (78) (heat resistance layer (HRL)) in, which particles (filler F) of an insulating ceramic are attached through a binder onto a surface of at least one of a negative electrode active material layer (63) and a separator (72, 74). In the nonaqueous electrolyte secondary battery, the insulating ceramic of the porous film (78) contains at least one of Fe and Ni.
Claims11
A nonaqueous electrolyte secondary battery comprising:
- a battery case;
- a wound electrode body that is stored in the battery case;
- and
- an electrolytic solution that is stored in the battery case,
- wherein the wound electrode body includes
- a positive electrode current collector foil,
- a positive electrode active material layer that contains positive electrode active material particles and is held by the positive electrode current collector foil,
- a negative electrode current collector foil,
- a negative electrode active material layer that contains negative electrode active material particles and is held by the negative electrode current collector foil,
- a separator formed of a porous polyolefin resin and interposed between the positive electrode active material layer and the negative electrode active material layer, and
- a porous film in which particles of an insulating ceramic are attached through a binder onto a surface of at least one of the negative electrode active material layer and the separator, and
- the electrolytic solution contains LiBOB,
- the insulating ceramic contains Fe in a weight ratio of 20 ppm to 6,000 ppm and Ni,
- the insulating ceramic contains Fe in a weight ratio more than Ni,
- the insulating ceramic is at least one of α-alumina or boehmite, and
- wherein the nonaqueous electrolyte secondary battery is a lithium ion secondary battery.
13 more elements
A nonaqueous electrolyte secondary battery comprising:
- a battery case;
- a wound electrode body that is stored in the battery case;
- and
- an electrolytic solution that is stored in the battery case,
- wherein the wound electrode body includes
- a positive electrode current collector foil,
- a positive electrode active material layer that contains positive electrode active material particles and is held by the positive electrode current collector foil,
- a negative electrode current collector foil,
- a negative electrode active material layer that contains negative electrode active material particles and is held by the negative electrode current collector foil,
- a separator formed of a porous polyolefin resin and interposed between the positive electrode active material layer and the negative electrode active material layer, and
- a porous film in which particles of an insulating ceramic are attached through a binder onto a surface of at least one of the negative electrode active material layer and the separator, and
- the electrolytic solution contains LiBOB,
- the insulating ceramic contains Ni in a weight ratio of 20 ppm to 6,000 ppm and Fe,
- the insulating ceramic contains Fe in a weight ratio more than Ni,
- the insulating ceramic is at least one of α-alumina or boehmite, and
- wherein the nonaqueous electrolyte secondary battery is a lithium ion secondary battery.
13 more elements
Dependencies are inferred from the claim text.