Positive electrode for lithium battery

Patent metadata

Field	Value
Publication number	US-2018090766-A1
Application number	US-201615561558-A
Country	US
Kind code	A1
Filing date	Mar 25, 2016
Priority date	Mar 27, 2015
Publication date	Mar 29, 2018
Grant date	—

Abstract

To provide a means for improving durability of a positive electrode for a lithium battery (in particular, a resin current collector for forming the positive electrode).
The means is achieved by a positive electrode for a lithium battery having a resin current collector containing a polyolefin-based resin matrix and a conductive filler, and a positive electrode active material layer provided on the resin current collector, characterized in that an electron conductive layer is disposed on the surface of the resin current collector that is in contact with the positive electrode active material layer.

First claim

1 .- 9 . (canceled)

10 . A bipolar type electrode for a lithium battery comprising a resin current collector containing a polyolefin-based resin matrix (with the provision that those having an alicyclic structure are excluded) and a conductive filler, a positive electrode active material layer provided on one surface of the resin current collector, and a negative electrode active material layer provided to have a direct contact with the other surface of the resin current collector,
wherein an electron conductive layer is disposed to have a direct contact with the surface of the resin current collector that is in contact with the positive electrode active material layer, and wherein the electron conductive layer mainly contains at least one of an epoxy resin, a polymer having a repeating unit derived from vinylidene fluoride and a polymer having a repeating unit derived from carbonic acid ester, and a conductive filler.

11 . The bipolar type electrode for a lithium battery according to claim 10 , wherein the polyolefin-based resin matrix is polyethylene (PE), polypropylene (PP), polymethylpentene (PMP), and a copolymer and a mixture thereof.

12 . The bipolar type electrode for a lithium battery according to claim 10 , wherein the conductive filler used for the electron conductive layer is a carbon-based filler.

13 . The bipolar type electrode for a lithium battery according to claim 10 , wherein oxidation resistance of the electron conductive layer at room temperature (25° C.) is 4.2 V or higher based on Li.

14 . A lithium battery obtained by using the bipolar type electrode for a lithium battery according to claim 10 .

15 . A bipolar type electrode for a lithium battery comprising a resin current collector containing a polyolefin-based resin matrix (with the provision that those having an alicyclic structure are excluded) and a conductive filler, a positive electrode active material layer provided on one surface of the resin current collector, and a negative electrode active material layer provided to have a direct contact with the other surface of the resin current collector,
wherein an electron conductive layer is disposed to have a direct contact with the surface of the resin current collector that is in contact with the positive electrode active material layer, and wherein the electron conductive layer is a p type conductive polymer.

16 . The bipolar type electrode for a lithium battery according to claim 15 , wherein oxidation resistance of the electron conductive layer at room temperature (25° C.) is 4.2 V or higher based on Li.

17 . A lithium battery obtained by using the bipolar type electrode for a lithium battery according to claim 15 .

18 . A positive electrode for a lithium battery comprising a resin current collector containing a polyolefin-based resin matrix (with the provision that those having an alicyclic structure are excluded) and a conductive filler, and a positive electrode active material layer provided on both surfaces of the resin current collector,
wherein an electron conductive layer is disposed to have a direct contact with the surface of the resin current collector that is in contact with the positive electrode active material layer, and wherein the electron conductive layer mainly contains at least one of an epoxy resin, a polymer having a repeating unit derived from vinylidene fluoride and a polymer having a repeating unit derived from carbonic acid ester, and a conductive filler.

19 . The positive electrode for a lithium battery according to claim 18 , wherein the polyolefin-based resin matrix is polyethylene (PE), polypropylene (PP), polymethylpentene (PMP), and a copolymer and a mixture thereof.

20 . The positive electrode for a lithium battery according to claim 18 , wherein the conductive filler used for the electron conductive layer is a carbon-based filler.

21 . The positive electrode for a lithium battery according to claim 18 , wherein oxidation resistance of the electron conductive layer at room temperature (25° C.) is 4.2 V or higher based on Li.

22 . A lithium battery obtained by using the positive electrode for a lithium battery according to claim 18 .

23 . A positive electrode for a lithium battery comprising a resin current collector containing a polyolefin-based resin matrix (with the provision that those having an alicyclic structure are excluded) and a conductive filler, and a positive electrode active material layer provided on both surfaces of the resin current collector,
wherein an electron conductive layer is disposed to have a direct contact with the surface of the resin current collector that is in contact with the positive electrode active material layer, and wherein the electron conductive layer is a p type conductive polymer.

24 . The positive electrode for a lithium battery according to claim 23 , wherein oxidation resistance of the electron conductive layer at room temperature (25° C.) is 4.2 V or higher based on Li.

25 . A lithium battery obtained by using the positive electrode for a lithium battery according to claim 23 .

Assignees

• Nissan Motor

Inventors

• Ohsawa Yasuhiko
• Satou Hajime
• Akama Hiroshi
• Horie Hideaki
• Mizuno Yusuke
• Fukumoto Hiroshi
• Okura Masatoshi
• Shindo Yasuhiro
• Tsudo Yasuhiro

Classifications

• H01M2004/029

  Bipolar electrodes · CPC title

• H01M6/48

  with bipolar electrodes · CPC title

• H01M4/13

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title

• H01M4/66 Primary

  Selection of materials · CPC title

• H01M4/667 Primary

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