Patent application EP20179876A (EP), filed 2020-06-15
Publication number: EP3758108A1
Title: THERMALLY CROSSLINKABLE BINDER AQUEOUS SOLUTION FOR LITHIUM-ION BATTERY, THERMALLY CROSSLINKABLE SLURRY FOR LITHIUM-ION BATTERY NEGATIVE ELECTRODE, NEGATIVE ELECTRODE FOR LITHIUM-ION BATTERY, LITHIUM-ION BATTERY NEGATIVE ELECTRODE MATERIAL, AND LITHIUM-ION BATTERY AND METHOD FOR PRODUCING THE SAME
Abstract: [0001]    Provided are a thermally crosslinkable binder aqueous solution for a lithium-ion battery, a thermally crosslinkable slurry for a lithium-ion battery negative electrode, a negative electrode for a lithium-ion battery, a lithium-ion battery negative electrode material, as well as a lithium-ion battery and a method for producing the same. The thermally crosslinkable binder aqueous solution for a lithium-ion battery, containing water-soluble poly(meth)acrylamide and having a pH of 5 to 7, wherein the water-soluble poly(meth)acrylamide is a polymer of a monomer group containing, with respect to 100 mol% of the monomer group, 2 mol% to 60 mol% of a (meth)acrylamide group-containing compound , 10 mol% to 50 mol% of one or more unsaturated acids selected from the group consisting of unsaturated carboxylic acids and unsaturated sulfonic acids or an inorganic salt thereof , and 15 mol% to 78 mol% of hydroxyalkyl(meth)acrylate having a hydroxyalkyl group having 2 to 4 carbon atoms.
IPC codes: C09J 133/    02            A I
C08F 220/    28            A I
C08L  33/    26            A I
C09J 133/    26            A I
H01M  10/    04            A I
H01M  10/  0525            A I
H01M  10/   058            A I
H01M   4/    13            A I
H01M   4/   139            A I
H01M   4/    62            A I
C08F 220/    56            A I
Claims: number: 1
text: A thermally crosslinkable binder aqueous solution for a lithium-ion battery, containing a water-soluble poly(meth)acrylamide (A) and having a pH of 5 to 7, wherein
the water-soluble poly(meth)acrylamide (A) is a polymer of a monomer group containing, with respect to 100 mol% of the monomer group,
number: 2
text: A thermally crosslinkable slurry for a lithium-ion battery negative electrode, containing the thermally crosslinkable binder aqueous solution for a lithium-ion battery according to claim 1 and a negative electrode active material (B), and having a pH of 5 to 7.
number: 3
text: The thermally crosslinkable slurry for a lithium-ion battery negative electrode according to claim 2, containing no particulate polymer.
number: 4
text: A negative electrode for a lithium-ion battery, obtained by applying the thermally crosslinkable slurry for a lithium-ion battery negative electrode according to claim 2 or 3 to a current collector (D), and drying and curing the same.
number: 5
text: A lithium-ion battery, comprising the negative electrode for a lithium-ion battery according to claim 4.
number: 6
text: A lithium-ion battery negative electrode material, obtained by applying a thermally crosslinkable slurry for a lithium-ion battery negative electrode to a current collector (D) and drying the same, wherein
the thermally crosslinkable slurry for a lithium-ion battery negative electrode contains a water-soluble poly(meth)acrylamide (A), water and a negative electrode active material (B), wherein the water-soluble poly(meth)acrylamide (A) is a polymer of a monomer group containing, with respect to 100 mol% of the monomer group,
number: 7
text: The lithium-ion battery negative electrode material according to claim 6, wherein a gel fraction of the water-soluble poly(meth)acrylamide (A) after drying is 0% by mass to 20% by mass.
number: 8
text: A method for producing a lithium-ion battery, comprising:
a drying step in which by heating at 60 °C to 140 °C a laminate having a laminate structure in which the lithium-ion battery negative electrode material (1) according to claim 6 or 7, a separator (2), a positive electrode for a lithium-ion battery (3), and a separator are laminated in this order, the water concentration of the negative electrode active material layer (C) is changed into 0.1% or less and the water-soluble poly(meth)acrylamide (A) is crosslinked until achieving a gel fraction of 70% by mass to 100% by mass.
number: 9
text: The method for producing a lithium-ion battery according to claim 8, comprising an electrolytic solution injection step of injecting an electrolytic solution after the drying step.
number: 10
text: The method for producing a lithium-ion battery according to claim 8 or 9, wherein the drying step is performed at 0.1 Pa to 100 Pa.
Office action: search_report, dated 2020-12-30
Rejection reasons: novelty_epc_54
inventive_step_epc_56
Prior art cited: ref_id: JP2015118908A
ref_type: patent
severity: background
ref_id: JP2015106488A
ref_type: patent
severity: background
ref_id: WO2015098507A1
ref_type: patent
severity: background
ref_id: JP2012190552A
ref_type: patent
severity: background
ref_id: JP2007227310A
ref_type: patent
severity: background
ref_id: JP2004185810A
ref_type: patent
severity: background
ref_id: JP2005259697A
ref_type: patent
severity: background
ref_id: JP5390336B2
ref_type: patent
severity: background
ref_id: JPS593761B2
ref_type: patent
severity: background
ref_id: JP2013089437A
ref_type: patent
severity: background
ref_id: US2017040612A1
ref_type: patent
severity: background
ref_id: WO2019082658A1
ref_type: patent
severity: background
ref_id: - "Handbook of Chemistry: Pure Chemistry II", CHEMICAL SOCIETY OF JAPAN
ref_type: npl
severity: background
ref_id: JPWO2018008555A1
ref_type: patent
severity: background
ref_id: WO2019013102A1
ref_type: patent
severity: background
ref_id: WO2019065471A1
ref_type: patent
severity: background
ref_id: US2004101757A1
ref_type: patent
severity: background
ref_id: US2017062828A1
ref_type: patent
severity: background
ref_id: WO2015098507A1
ref_type: patent
severity: background
ref_id: US2004101757
ref_type: patent
severity: obviousness
ref_id: WO2015098507
ref_type: patent
severity: background
ref_id: US2017062828
ref_type: patent
severity: obviousness
ref_id: WO2019013102
ref_type: patent
severity: novelty_destroying
ref_id: WO2019065471
ref_type: patent
severity: novelty_destroying
ref_id: JPWO2018008555
ref_type: patent
severity: novelty_destroying
Final disposition: pending (2020-12-30)