Electrode, electrochemical element, liquid composition, and method for producing electrode
An electrode is provided that includes a current collector, an electrode mixture layer on the current collector, and an insulating layer on the electrode mixture layer. The electrode mixture layer includes an active material. The insulating layer includes an insulating material and a resin having a repeating structural unit represented by a specific general formula.
1 . An electrode comprising:
a current collector;
an electrode mixture layer on the current collector, the electrode mixture layer including an active material; and
an insulating layer on the electrode mixture layer, the insulating layer including:
an insulating material; and
at least one resin having a repeating structural unit represented by a following general formula (1) or (2):
where, in the general formulae, “*” represents a bonding site with an adjacent main chain structural unit, and “R” represents at least one structure of polyethylene oxide, polypropylene oxide, polycarbonate, silicone, polybutadiene, or hydrogenated polybutadiene butane,
wherein a mass ratio of the resin having the repeating structural unit represented by the general formula (1) or (2) relative to the insulating material is 1.5% or more and 15% or less.
2 . The electrode according to claim 1 , wherein the resin having the repeating structural unit represented by the general formula (1) or (2) is a reaction product of a resin having the repeating structural unit represented by the following general formula (3) and a resin represented by the following general formula (5):
where, in the general formulae, “*” represents a bonding site with an adjacent main chain structural unit, and “R2” represents at least one structure of polyethylene oxide, polypropylene oxide, polycarbonate, silicone, polybutadiene, or hydrogenated polybutadiene butane, and “R3” and “R4” each independently represent a hydroxyl group or an amino group.
3 . The electrode according to claim 2 , wherein “R2” in the general formula (5) is a poloxamer.
4 . The electrode according to claim 1 , wherein “R” in the general formula (1) or (2) is a poloxamer.
5 . The electrode according to claim 1 , further comprising a polymer compound including hydroxyl groups or amino groups at least at two or more terminals.
6 . The electrode according to claim 5 , wherein the polymer compound is a poloxamer.
7 . The electrode according to claim 1 , wherein an average coverage of the insulating layer for the electrode mixture layer is 70% or more.
8 . The electrode according to claim 1 , wherein the insulating material is an inorganic oxide.
9 . The electrode according to claim 8 , wherein the inorganic oxide is a-alumina.
10 . An electrode comprising:
a current collector;
an electrode mixture layer on the current collector, the electrode mixture layer including an active material; and
an insulating layer on the electrode mixture layer, the insulating layer including:
an insulating material; and
at least one resin having a repeating structural unit represented by a following general formula (4):
where, in general formula (4), “*” represents a bonding site with an adjacent main chain structural unit, “A” represents an alkyleneoxy chain having a repeating unit structure of an ethyloxy group or a propyloxy group terminally protected by a hydroxyl group or an alkyl group having 1 to 4 carbon atoms, and “B” represents an ester group, an amide group, or an oxygen atom.
11 . The electrode according to claim 10 , wherein “A” in the general formula (4) includes the ethyloxy group terminally protected by a hydroxyl group or an alkyl group having 1 to 4 carbon atoms.
12 . An electrode comprising:
a current collector;
an electrode mixture layer on the current collector, the electrode mixture layer including an active material; and
an insulating layer on the electrode mixture layer, the insulating layer including:
an insulating material; and
at least one resin having a repeating structural unit represented by a following general formula (1), (2), or (4):
where, in the general formulae, “*” represents a bonding site with an adjacent main chain structural unit, “R” represents at least one structure of polyethylene oxide, polypropylene oxide, polycarbonate, silicone, polybutadiene, or hydrogenated polybutadiene butane, “A” represents an alkyleneoxy chain having a repeating unit structure of an ethyloxy group or a propyloxy group terminally protected by a hydroxyl group or an alkyl group having 1 to 4 carbon atoms, and “B” represents an ester group, an amide group, or an oxygen atom,
wherein the resin having the repeating structural unit represented by the general formula (1) or (2) is a reaction product of the resin having the repeating structural unit represented by general formula (3) and a resin represented by the following general formula (5):
where, in the general formula (5), “R2” represents at least one structure of polyethylene oxide, polypropylene oxide, polycarbonate, silicone, polybutadiene, or hydrogenated polybutadiene butane, and “R3” and “R4” each independently represent a hydroxyl group or an amino group.
13 . The electrode according to claim 12 , wherein:
the active material in the electrode mixture layer includes a positive electrode active material; and
the resin in the insulating layer includes at least one resin having the repeating structural unit represented by the general formula (3) or (4).
14 . The electrode according to claim 12 , wherein a mass ratio of the resin having the repeating structural unit represented by the general formula (3) or (4) relative to the insulating material is 0.3% or more and 20% or less.
15 . An electrochemical element ( 50 ) comprising the electrode according to claim 1 .