Namics Corporation

Japan Science and Technology Agency

Mamoru Baba

Takayuki Fujita

Noriyuki Sakai

Hitoshi Masumura

Hiroshi Sato

Hiroshi Sasagawa

Shoichi Iwaya

Masashi Kikuchi

Rongbin Ye

A lithium ion secondary battery that can be charged without regard to polarity is disclosed. The lithium ion secondary battery includes a lithium ion secondary battery unit, which includes a first electrode layer and a second electrode layer that are laminated on an electrolytic region. The first electrode layer and the second electrode layer contain LiMnOas a common active material.

Lithium ion secondary battery containing a non-polar active material

Conventional ion rechargeable batteries having an electrode layer on an electrolyte layer suffer from an impurity layer formed at the interface, degrading performance. Conventional batteries with no such impurity layer have a problem of weak interface bonding. In the present invention, in a baking process step after an electrode layer is laminated on an electrolyte layer, materials for an electrode layer and an electrolyte layer are selected such that an intermediate layer formed of a reaction product contributing to charging and discharging reactions is formed at the interface of the electrode layer and the electrolyte layer. In addition, a paste that an active material is mixed with a conductive material at a predetermined mixing ratio is used to form a positive electrode layer and a negative electrode layer. Reductions in electrode resistance and interface resistance and improvement of charging and discharging cycle characteristics are made possible.

Lithium ion rechargeable battery and process for producing the lithium ion rechargeable battery

This is to provide an all solid state secondary battery which can be produced by an industrially employable method capable of mass-production and has excellent secondary battery characteristics. This is an all solid state secondary battery containing a laminated material in which a positive-electrode unit and a negative-electrode unit are laminated alternately through an ion conductive inorganic-material layer, the positive-electrode unit has positive active material layers on both surfaces of a positive-electrode collector layer, the above-mentioned negative-electrode unit has negative active material layers on both surfaces of a negative-electrode collector layer, (A) at least one of the positive-electrode collector layer and the negative-electrode collector layer comprises a metal of either of Ag, Pd, Au and Pt, or an alloy containing either of Ag, Pd, Au and Pt, or a mixture containing two or more kinds selected from the metals and alloys, (B) each layer is in a sintered state, or (C) at least the starting material for the ion conductive inorganic material of the ion conductive inorganic-material layer is a calcined powder.

All solid state secondary battery

A method for manufacturing an all solid-state lithium-ion rechargeable battery includes forming a first active material layer on a base, forming a solid electrolyte layer connected to the first active material layer, forming a second active material layer connected to the solid electrolyte layer, and repairing a short-circuit defect produced between the first active material layer and the second active material layer by supplying a repair current between the first active material layer and the second active material layer.

Method for manufacturing all solid-state lithium-ion rechargeable battery, and method for testing all solid-state lithium-ion rechargeable battery

To provide novel devices constituting light detection systems with a simple configuration, a low maintenance cost, a reduced size and weight, and high reliability by integrating light detection components and power supplies. A photosensitive solid-state thin-film lithium-ion secondary cell including a photosensitive negative-electrode active material layer as a component, wherein extraneous light can be constantly detected by utilizing a change in open-circuit voltage of the cell caused when the extraneous light is incident on the photosensitive negative-electrode active material layer. Lithium ions can be readily received and emitted and light in a broad wavelength range over a near-infrared light range, the entire visible light range, and a near-ultraviolet light range can be detected by utilizing a porous silicon layer having a controlled porosity as the negative-electrode active material layer.

Growing community of inventors

Morioka, Japan

Mamoru Baba