Collector for bipolar lithium ion secondary batteries

Patent metadata

Field	Value
Publication number	US-9537152-B2
Application number	US-201214233980-A
Country	US
Kind code	B2
Filing date	Jul 18, 2012
Priority date	Jul 26, 2011
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

A collector for bipolar lithium ion secondary batteries comprises a first conductive layer that is obtained by adding a conductive filler to a base that contains an imide group-containing resin, and a second conductive layer that has a function of blocking lithium ions. The second conductive layer comprises a blocking resin layer that is obtained by adding a conductive filler to a base that contains a resin which contains no imide group, and a metal layer. This collector for bipolar lithium ion secondary batteries is used in such a manner that the first conductive layer is on the positive electrode active material layer side with respect to the second conductive layer.

First claim

The invention claimed is:

1. A current collector for a bipolar lithium ion secondary battery, comprising:
a first electrically conductive layer in which electrically conductive filler is added to a substrate containing imide group-containing resin; and
a second electrically conductive layer that functions to isolate lithium ions,
the second electrically conductive layer including an isolation resin layer and a metal layer, the isolation resin layer having a constitution in which electrically conductive filler is added to a substrate containing resin not containing imide group, and
the first electrically conductive layer being located in a manner such that a positive electrode active material layer is closer thereto than the second electrically conductive layer, wherein the second electrically conductive layer further includes a metal elution-preventing layer, the metal elution-preventing layer being located on a surface of the metal layer to face the first electrically conductive layer.

2. The current collector for a bipolar lithium ion secondary battery according to claim 1 , wherein the metal layer contains at least one metal material selected from the group consisting of aluminum, nickel, copper, iron, titanium, and an alloy, a metal carbide, a metal nitride and a metal oxide of these metals.

3. The current collector for a bipolar lithium ion secondary battery according to claim 1 , wherein the metal layer is thinner than the first electrically conductive layer.

4. An electrode for a bipolar lithium ion secondary battery, comprising:
the current collector according to claim 1 ;
a positive electrode active material layer formed on a surface of the current collector towards the first electrically conductive layer; and
a negative electrode active material layer formed on a surface of the current collector towards the second electrically conductive layer.

5. A bipolar lithium ion secondary battery comprising a power generation element in which the electrode according to claim 4 and an electrolyte layer are stacked on top of each other.

Assignees

• Tanaka Yasuyuki
• Yanagida Masami
• Ogawa Kohei
• Oku Satoshi
• Kojima Masahiro
• Kikuchi Takashi
• Ito Takashi
• Nissan Motor
• Kaneka Corp

Inventors

• Tanaka Yasuyuki
• Yanagida Masami
• Ogawa Kohei
• Oku Satoshi
• Kojima Masahiro
• Kikuchi Takashi
• Ito Takashi

Classifications

• H01M4/668

  Composites of electroconductive material and synthetic resins · CPC title

• H01M4/0404

  by coating on electrode collectors · CPC title

• H01M10/0585

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/667 Primary

  in the form of layers, e.g. coatings · CPC title