Electrode structure and secondary battery
An electrode structure and secondary battery technology, applied in the direction of secondary battery, electrolyte battery manufacturing, non-aqueous electrolyte battery, etc., can solve problems such as limitations, battery input and output performance decline, battery capacity decline, etc.
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no. 1 Embodiment approach
[0039] The secondary battery according to the first embodiment includes a positive electrode, a negative electrode, and a separator. The positive electrode and the negative electrode each include a current collector and an active material-containing layer supported on at least one surface of the current collector. The separator includes a layer of organic fibers facing the active material-containing layer of at least one of the positive electrode and the negative electrode. The layer of organic fibers contains organic fibers having an aspect ratio (V1 / H1) of a cross section intersecting the longitudinal direction of the organic fibers of 0.97 or less. The organic fiber having an aspect ratio (V1 / H1) is in contact with the surface of the active material-containing layer having a roughness higher than the arithmetic mean surface roughness Ra of the active material-containing layer in a cross section. V1 is a length parallel to the thickness direction of the active material-cont...
no. 2 Embodiment approach
[0140] The electrode structure according to the second embodiment includes an electrode and a separator including a layer of organic fibers. The electrode includes a current collector and an active material-containing layer supported on at least one surface of the current collector. The layer of organic fibers contains organic fibers having an aspect ratio (V1 / H1) of a cross section perpendicular to the longitudinal direction of the organic fibers of 0.97 or less. The organic fiber having an aspect ratio (V1 / H1) is in contact with the surface of the active material-containing layer having a roughness higher than the arithmetic mean surface roughness Ra of the active material-containing layer in a cross section. V1 is a length parallel to the thickness direction of the active material-containing layer. H1 is a length horizontal to the in-plane direction of the active material-containing layer.
[0141] The electrode included in the electrode structure according to the second ...
Embodiment 1
[0147] As the negative electrode, an electrode in which a negative electrode active material layer containing lithium titanate of a spinel structure was provided on both surfaces of a current collector formed of aluminum foil was prepared. The average particle diameter of primary particles of lithium titanate was 0.5 μm. In addition, no negative electrode active material-containing layer was formed at one end portion of the current collector in the longitudinal direction, and this portion was used as a negative electrode tab.
[0148] On this negative electrode, deposits of organic fibers were formed by electrospinning.
[0149] As the organic material, polyimide was used. This polyimide was dissolved in DMAc as a solvent at a concentration of 20% by mass to prepare a raw material solution for forming a deposit of organic fibers. The obtained raw material solution was supplied to the surface of the negative electrode from the spinning nozzle at a supply rate of 5 μl / min usin...
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