Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Kunihiko Mineya

Kazuya Iwamoto

Shuji Ito

Kenta Nagamine

Katsumi Kashiwagi

Tatsuki Hiraoka

A negative electrode material of the present disclosure includes a negative electrode active material, a solid electrolyte, and a coating material coating the negative electrode active material. The coating material is represented by the following composition formula (1), where a, b, and c are each a positive real number, A is at least one selected from the group consisting of P and S, and X is F and O.LiAX  (1)

Negative electrode material and battery

A negative electrode for a lithium ion batteryincludes a negative electrode current collector, a negative electrode active material layer, and a lithium silicate layer. The negative electrode active material layercontains silicon. The lithium silicate layercontains lithium, oxygen, and silicon forming a Li&#x2014;O&#x2014;Si bond, and is formed at the interface between the negative electrode current collectorand the negative electrode active material layer. The negative electrode active material layerand the lithium silicate layermay be composed of columnar bodies.

Negative electrode for lithium ion battery and method for producing the same, and lithium ion battery

A positive electrode plate, a separator, and a negative electrode plateare prepared. The positive electrode plate, the separator, and the negative electrode plateare combined so as to form a spirally-wound electrode assembly. A winding end portionof the electrode assemblyis fixed with a heat-sensitive adhesive (preferably, a heat-sensitive adhesive tape) whose adhesive force can be reduced by heating or cooling. The electrode assemblyis placed in an outer casing, and then the ambient temperature of the electrode assemblyis adjusted so that the electrode assemblyis loosened due to reduction in the adhesive force of the heat-sensitive adhesive. An electrolyte solution is injected into the outer casing

Method for producing lithium-ion battery

A lithium ion secondary battery includes: an electrode assembly including a positive electrode plate, a negative electrode plate, and a separator; and an elastic member. The electrode assembly is wound around an axis into a flat shape having a curved end defining a corner portion. The elastic member is arranged inside the electrode assembly and into at least the corner portion of the electrode assembly such that at least a portion of the elastic member is positioned between at least a portion of one of the positive electrode plate and the negative electrode plate and at least a portion of the separator in a direction perpendicular to the axis. The elastic member is made of a material having porosity.

Lithium ion secondary battery including an elastic member arranged inside an electrode assembly and method for producing the same

An electrode assembly () is formed by combining a positive electrode plate (), a separator (), and a negative electrode plate (), and the electrode assembly () was wound. An insulating member () having a hollow portion () is placed on the positive electrode plate (), the negative electrode plate (), or the separator () before the end of the winding step so that the insulating member () is incorporated inside the outermost of the electrode assembly () and into a corner portion () of the electrode assembly () in the winding direction. After a winding end portion () of the electrode assembly () is fixed, the hollow portion () is broken. Thereby, a space () resulting from the hollow portion () is formed inside the outermost of the electrode assembly ().

Growing community of inventors

Osaka, Japan

Kunihiko Mineya