Non-aqueous electrolyte secondary battery and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-2018048023-A1
Application number	US-201515539460-A
Country	US
Kind code	A1
Filing date	Dec 25, 2015
Priority date	Dec 26, 2014
Publication date	Feb 15, 2018
Grant date	—

Abstract

To provide a structure which allows production of an electrode, even if the film thickness of an electrode is increased; and a non-aqueous electrolyte secondary battery using the same.
A non-aqueous electrolyte secondary battery including a power generating element including: two electrodes having different polarity and formed by forming an active material layer on a current collector; and an electrolyte layer positioned between the electrodes, wherein at least one of the active material layers of the two electrodes having different polarity contains an active material and a conductive member made from an electron conducting material, the active material layer has a first principal surface which comes into contact with the electrolyte layer side, and a second principal surface which comes into contact with the current collector side, at least a part of the conductive member forms a conductive path electrically connecting the first principal surface to the second principal surface, and the conductive path is in contact with the active material in the periphery of the conductive path, at least a part of the surface of the active material is coated with a coating agent that includes a coating resin and a conduction assisting agent, and an electrolyte solution contained in the electrolyte layer or the two electrodes having different polarity is a gel phase electrolyte.

First claim

1 .- 9 . (canceled)

10 . A non-aqueous electrolyte secondary battery comprising a power generating element including:
two electrodes having different polarity and formed by forming an active material layer on a current collector; and an electrolyte layer positioned between the electrodes, wherein at least one of the active material layers of the two electrodes having different polarity contains an active material and a conductive member made from an electron conducting material, the active material layer has a first principal surface which comes into contact with the electrolyte layer side, and a second principal surface which comes into contact with the current collector side, at least a part of the conductive member forms a conductive path electrically connecting the first principal surface to the second principal surface, and the conductive path is in contact with the active material in the periphery of the conductive path, at least a part of the surface of the active material is coated with a coating agent that includes a coating resin and a conduction assisting agent, an electrolyte solution contained in the electrolyte layer or the two electrodes having different polarity is a gel phase electrolyte, and the coating resin has tensile elongation at break of 10% or more in a saturated liquid absorption state.

11 . A non-aqueous electrolyte secondary battery comprising a power generating element including:
two electrodes having different polarity and formed by forming an active material layer on a current collector; and an electrolyte layer positioned between the electrodes, wherein at least one of the active material layers of the two electrodes having different polarity contains an active material and a conductive member made from an electron conducting material, the active material layer has a first principal surface which comes into contact with the electrolyte layer side, and a second principal surface which comes into contact with the current collector side, at least a part of the conductive member forms a conductive path electrically connecting the first principal surface to the second principal surface, and the conductive path is in contact with the active material in the periphery of the conductive path, at least a part of the surface of the active material is coated with a coating agent that includes a coating resin and a conduction assisting agent, an electrolyte solution contained in the electrolyte layer or the two electrodes having different polarity is a gel phase electrolyte, and the active material layer does not contain a binder that is starch, polyvinylidene fluoride, polyvinyl alcohol, carboxylmethyl cellulose, polyvinyl pyrrolidone, tetrafluoroethylene, styrene-butadiene rubber, polyethylene, or polypropylene.

12 . The non-aqueous electrolyte secondary battery according to claim 10 , wherein a conductivity of the gel phase electrolyte is 0.1 mS/cm or more.

13 . The non-aqueous electrolyte secondary battery according to claim 10 , wherein a matrix polymer for forming the gel phase electrolyte includes carboxylic acid ester as a functional group.

14 . The non-aqueous electrolyte secondary battery according to claim 10 , wherein the coating resin is a urethane resin that is obtained by reacting an active hydrogen component and an isocyanate component.

15 . The non-aqueous electrolyte secondary battery according to claim 10 , wherein the coating resin is a polymer which has a vinyl monomer as an essential constitutional monomer and the vinyl monomer includes a vinyl monomer having a carboxy group and a vinyl monomer represented by the following formula (1):
CH 2 ═C(R 1 )COOR 2   (1)
in the formula (1), R 1 is a hydrogen atom or a methyl group; and R 2 is a linear alkyl group having a carbon number of 1 to 4 or a branched alkyl group having a carbon number of 4 to 36.

16 . The non-aqueous electrolyte secondary battery according to claim 10 , wherein a matrix polymer for forming the gel phase electrolyte is obtained by adding a thermal polymerization initiator to an electrolyte solution which contains a mixture of at least a molecule having two polymerizable groups and a molecule having three polymerizable groups, and gelling the electrolyte solution by thermal polymerization.

17 . A method for manufacturing a non-aqueous electrolyte secondary battery having a power generating element including: two electrodes having different polarity and formed by forming an active material layer on a current collector; and an electrolyte layer positioned between the electrodes,
wherein at least one of the active material layers of the two electrodes having different polarity contains an active material and a conductive member made from an electron conducting material, the active material layer has a first principal surface which comes into contact with the electrolyte layer side, and a second principal surface which comes into contact with the current collector side, at least a part of the conductive member forms a conductive path electrically connecting the first principal surface to the second principal surface, and the conductive path is in contact with the active material in the periphery of the conductive path, at least a part of the surface of the active material is coated with a coating agent that includes a coating resin and a conduction assisting agent, an electrolyte solution contained in the electrolyte layer or the two electrodes having different polarity is a gel phase electrolyte, and the coating resin has tensile elongation at break of 10% or more in a saturated liquid absorption state.

18 . A method for manufacturing a non-aqueous electrolyte secondary battery having a power generating element including: two electrodes having different polarity and formed by forming an active material layer on a current collector; and an electrolyte layer positioned between the electrodes,
wherein at least one of the active material layers of the two electrodes having different polarity contains an active material and a conductive member made from an electron conducting material, the active material layer has a first principal surface which comes into contact with the electrolyte layer side, and a second principal surface which comes into contact with the current collector side, at least a part of the conductive member forms a conductive path electrically connecting the first principal surface to the second principal surface, and the conductive path is in contact with the active material in the periphery of the conductive path, at least a part of the surface of the active material is coated with a coating agent that includes a coating resin and a conduction assisting agent, an electrolyte solution contained in the electrolyte layer or the two electrodes having different polarity is a gel phase electrolyte, and the active material layer does not contain a binder that is starch, polyvinylidene fluoride, polyvinyl alcohol, carboxylmethyl cellulose, polyvinyl pyrrolidone, tetrafluoroethylene, styrene-butadiene rubber, polyethylene, or polypropylene.

19 . The manufacturing method according to claim 17 , wherein a matrix polymer for forming the gel phase electrolyte is obtained by adding a thermal polymerization initiator to an electrolyte solution which contains at least a molecule having two polymerizable groups and a molecule having three polymerizable groups, and gelling the electrolyte solution by thermal polymerization.

20 . The non-aqueous electrolyte secondary battery according to claim 10 , wherein thickness of the active material layer of at least one of the two electrodes having different polarity is 200 μm or more.

Assignees

• Nissan Motor

Inventors

• Ohsawa Yasuhiko
• Kusachi Yuki
• Akama Hiroshi
• Horie Hideaki
• Mizuno Yusuke
• Kawakita Kenichi
• Shindo Yasuhiro
• Tsudo Yasuhiro

Classifications

• H01M2300/0025

  Organic electrolyte · CPC title

• H01M10/0585 Primary

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

• H01M4/139

  Processes of manufacture · CPC title

• H01M4/36

  Selection of substances as active materials, active masses, active liquids · CPC title

• H01M4/13

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