Method of manufacturing secondary battery negative electrode
AssigneeKao Corporation
InventorsRyuichi Tsuji, Kuniyuki Nakanishi, Toru Nishimura, Tadashi Hirabayashi, Atsushi Suzuki
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Abstract
The present invention relates to a process for producing an anode for a secondary battery, which is capable to reduce a contact resistance between a sintered material which contains silicon as an anode active material and a current collector. A binder and a solvent are mixed with a silicon-containing anode material to prepare a slurry. A base material made of a foil or mesh of conductive metal is coated with the slurry, and the solvent is removed to form a coated film. The coated film is sintered in a non-oxidizing atmosphere, thereby integrating a sintered material of the coated film with the base material.
Claims8
A process for producing an anode for a secondary battery, said process comprising:
- (a) adding a binder and a solvent to a silicon-containing anode material to prepare a slurry;
- (b) coating a base material made of a foil or mesh of conductive metal with the slurry, and then removing the solvent to form a coated film;
- and
- (c) sintering the coated film in a non-oxidizing atmosphere, thereby integrating a sintered material of the coated film with the base material.
An anode for a secondary battery comprising:
- a base material made of a foil or mesh of conductive metal;
- and
- an anode sintered material formed on the base material integrally with the base material by the process of sintering a coated film which is coated on the base material and comprises a silicon-containing anode material and a binder.
A process for producing an anode for a secondary battery, said process comprising:
- (a) adding a binder and a solvent to a silicon-containing anode material to prepare a slurry;
- (b) coating a base film for coating with the slurry, and then removing the solvent to form a coated film;
- (c) peeling the coated film from the base film for coating, and then contact-bonding the coated film to a base material made of a foil or mesh of conductive metal;
- and further sintering the coated film, thereby integrating a sintered material of the coated film with the base material.
An anode for a secondary battery consisting essentially of:
- a sintered material which contains silicon as an anode active material and a carbon material;
- and
- a base material made of a foil or mesh of conductive metal,
- wherein the sintered material is integrated with the base material, and has a thickness in a range of 10 to 500 μm and a base area of not less than 4 cm2.
A non-aqueous secondary battery comprising:
- an anode obtained by sintering a coated film comprising a silicon-containing anode material and a binder and a base material made of a foil or net of conductive material, thereby integrating a sintered material of the coated film with the base material;
- a cathode containing a lithium transition metal oxide;
- and
- an electrolyte dissolving a lithium compound in an organic solvent, or a solid electrolyte containing a lithium ion-conductive non-aqueous electrolyte, the solid electrolyte being obtained by incorporating a lithium compound into a polymer or retaining the organic solvent containing the lithium compound dissolved therein with the polymer.
An anode for a secondary battery consisting essentially of:
- a sintered material which contains silicon as an anode active material and a carbon material;
- and
- a base material made of a foil or mesh conductive metal,
- wherein the sintered material is integrated with the base material by the process of sintering a silicon-containing anode material, and has a thickness in a range of 10 to 500 μm and a base area of not less than 4 cm2.
Dependencies are inferred from the claim text.