Lithium ion secondary battery and method for producing same
AssigneeVehicle Energy Japan Inc.
InventorMotonari Kifune
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Abstract
It is an object to provide a lithium ion secondary battery that ensures a replaceability of an electrolyte in a proximity of an active material and is excellent in output and responsiveness. The lithium ion secondary battery includes an electrode that includes a negative electrode foil, a negative electrode mixture layer disposed on a surface of the negative electrode foil, and an insulating layer disposed on a surface of the negative electrode mixture layer. The insulating layer contains ceramic particles. On the surface of the negative electrode mixture layer facing a border between the insulating layer and the negative electrode mixture layer, a plurality of holes (puddles) having diameters of 2.5 μm or more are provided.
Claims15
A lithium ion secondary battery comprising
- an electrode that includes:
- an electrode foil;
- a mixture layer disposed on a surface of the electrode foil that contains active material particles;
- and
- an insulating layer disposed on a surface of the mixture layer, the insulating layer containing ceramic particles,
- wherein, on the surface of the mixture layer facing a border between the insulating layer and the mixture layer, a plurality of holes having diameters of 2.5 μm or more are provided so as to be surrounded by the active material particles and the insulating layer, and
- wherein the plurality of the holes are present on a straight line having a length of 100 μm along the border between the insulating layer and the mixture layer in a scanning electron microscope (SEM) image of a cross-sectional surface of the mixture layer and the insulating layer.
A lithium ion secondary battery comprising
- an electrode that includes:
- an electrode foil;
- a mixture layer disposed on a surface of the electrode foil that contains active material particles;
- and
- an insulating layer disposed on a surface of the mixture layer, the insulating layer containing ceramic particles,
- wherein:
- on the surface of the mixture layer facing a border between the insulating layer and the mixture layer, a plurality of holes having diameters of 2.5 μm or more are provided so as to be surrounded by the active material particles and the insulating layer, and
- the particle diameters of the ceramic particles are 0.5 μm or more and 3.0 μm or less and
- ceramic particles having a thicknesses of 0.5 μm to 2 μm and major axes of 1 μm to 5 μm comprise 90% of the mass of the ceramic particles.
Dependencies are inferred from the claim text.