Showa Denko Packaging Co., Ltd.

Showa Denko K.k.

Daisuke Hashimoto

Takurou Watanabe

Satoshi Yamazaki

Kiyoshi Tada

Hiroshi Hata

Koji Hisayuki

Keiichi Yokoi

The present invention provides an anode material for a lithium secondary battery, which material realizes prolongation of the cycle life of a lithium secondary battery. The present invention relates to an anode active material for a lithium secondary battery, the active material containing a powder produced by a step of forming an etched foil through etching of both surfaces of a foil of Al having a purity of 90 mass % or higher, and a step of shredding the etched foil, the steps being carried out in this order.

Negative electrode active substance for lithium secondary battery and method for producing same

A laminating water-based surface treatment agent according to the present invention includes a chitosan derivative, a carboxyl compound having at least one carboxyl group in a molecule, and water. The content mass ratio of the chitosan derivative/the carboxyl compound falls within a range of 1.0/0.5 to 1.0/3.0. The laminating water-based surface treatment agent of the present invention can form an undercoating excellent in HF-resistance, electrolyte resistance, and solvent resistance, and also can sufficiently secure laminating adherence for a long term under more extreme environments required for a packaging material for a battery case or a tab lead for, e.g., a lithium ion secondary battery for automobiles.

Laminating water-based surface treatment agent, surface treatment method and surface treated material

The present invention is to provide a positive tab lead capable of being connected with each other with a sufficient connection strength at a low energy cost. It is constituted such that a partial coating layer () made of nickel, tin or solder is formed on at least a part of a region of an aluminum plate () exposed to an outside of an outer cover. It is preferable to form a chitosan layer () containing one or more compounds selected from the group consisting of chitosan and chitosan derivatives on the surface of the tab lead.

Positive electrode tab lead, negative electrode tab lead, and battery

A terminal leadincludes an inner end portionto be arranged inwardly of an exterior casingwhich accommodates an electrochemistry element, an outer end portionto be arranged outwardly of the exterior casing, and a plate-shaped metallic substrateas a base material. An insulating resin filmis arranged at a portion of the terminal leadcorresponding to a seal portionof the exterior casing. In this terminal lead, a surface coating layeris formed on both surfacesandof the metallic substratein a thickness direction thereof. A coated amount of both widthwise end portionsandof the surface coating layerformed on both surfacesandof the metallic substratein the thickness direction is less than that a widthwise intermediate portionthereof.

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Oyama, Japan

Daisuke Hashimoto