A secondary battery electrode includes: a current collector made of a porous metal material; and an electrode material mixture with which the current collector is filled. The current collector includes a material mixture-filled segment that is filled with the electrode material mixture, and a material mixture-unfilled segment that is unfilled with the electrode material mixture. The material mixture-unfilled segment includes a current-collecting tab which is thinner than the material mixture-filled segment and in which the porous metal material is present at a higher density than in the material mixture-filled segment, and a tab convergence portion via which the material mixture-filled segment is coupled to the current-collecting tab. The tab convergence portion is provided with at least one rib extending from a side adjacent to the material mixture-filled segment toward the current-collecting tab.

An electrode for a power storage device includes a non-woven fabric current collector that comprises short fibers of aluminum or copper having an average length of 25 mm or less; and adsorbent material powder on which electrolyte ions are adsorbed during charging or active material powder which chemically react during charging and discharging, where the powder exists in the gaps formed between the short fibers of the non-woven fabric current collector.

To provide an electrode configured to decrease the heat generation amount of solid-state batteries. An electrode for solid-state batteries, wherein the electrode comprises an electrode layer, a current collector, and a PTC layer which is disposed between the electrode layer and the current collector and which is in contact with the electrode layer; wherein the PTC layer contains an electroconductive material, Ni and a polymer; and wherein a volume percent of the Ni in the PTC layer is larger than a volume percent of the electroconductive material in the PTC layer.

A method for producing an electrode sheet includes heating before pressing to heat the electrode sheet to soften or melt binder particles contained in an electrode mixture layer and roll-pressing the electrode sheet heated in the heating before pressing by use of first and second rolls. In the roll-pressing, the temperature of an outer peripheral surface of a first roll with which an outer surface of the electrode mixture layer of the electrode sheet contacts is set lower than the temperature of an outer peripheral surface of the second roll, and the electrode sheet is roll-pressed so that an adhesive strength of binder particles in the electrode mixture layer to the first roll is reduced lower than an adhesive strength of the binder particles to a current collecting foil.

Provided are an electrode for lithium ion secondary batteries which can prevent cracking of the electrode, and a lithium ion secondary battery made using the same. An electrode (1, 2) for a lithium ion secondary battery (100) includes a collector (10, 20) of a metal porous body having a predetermined thickness, and having a corner of at least one location in a stereoscopic view; and an electrode mixture (18, 28) filled into these pores. The collector has a mixture filled region (11, 21) in which the electrode mixture is filled, and a mixture non-filled region (15, 25) in which the electrode mixture is not filled, or a high modulus filler having smaller elastic modulus than the electrode mixture is filled, existing at a corner of the collector.

Provided is an electrode for an electrochemical device that can cause an electrochemical device to display excellent cycle characteristics, rate characteristics, and high-temperature storage characteristics. The electrode includes a current collector and an electrode mixed material layer formed on the current collector. The electrode mixed material layer contains an electrode active material, a conductive material, and a dispersant, and the conductive material includes one or more carbon nanotubes. When mixed material layer resistance of the electrode mixed material layer is taken to be X Ω.Math.cm and interfacial resistance of the electrode mixed material layer with the current collector is taken to be Y Ω.Math.cm.sup.2, X is 20 or less, Y is 0.3 or less, and a ratio (X/Y) of X relative to Y is not less than 40 and not more than 1,000.

A current collector includes a current collector body and a lithiophilic layer applied on a surface of the current collector body. The lithiophilic layer has lithium affinity and comprises a lithiophilic material. The lithiophilic material comprises an internal structure and an external structure, and the internal structure is a cavity.

This positive electrode includes: a positive electrode current collector; a positive electrode mixed material layer that is formed on at least one surface of the positive electrode current collector; and a protective layer which includes an insulating inorganic compound and a conductive material, and is interposed between the positive electrode current collector and the positive electrode mixed material layer. The protective layer includes secondary particles comprising agglomerated primary particles of the inorganic compound. The median value of the particle size of the secondary particles is 30 μm or less.

A negative electrode current collector and a negative electrode for a solid-state battery including the same are provided. The negative electrode current collector comprises a metal foil which is electroconductive, and a coating layer formed on a surface of the metal foil and comprising metal-carbon composite particles. The metal-carbon composite particles comprise metal particles and carbon particles and apply the metal particles evenly on the surface of the metal foil, and are capable of inducing even lithium electrodeposition between the coating layer and the metal foil, thereby forming a uniform lithium metal plating film on the negative electrode current collector.

An electrode improved for achieving a storage battery having both a high electrode strength and favorable electrode conductivity is provided. The electrode includes graphene and a modified polymer in an active material layer or includes a layer substantially formed of carbon particles and an active material layer including a modified polymer over a current collector. The modified polymer has a poly(vinylidene fluoride) structure and partly has a polyene structure or an aromatic ring structure. The polyene structure or the aromatic ring structure is sandwiched between poly(vinylidene fluoride) structures.