Thermistor layer, electrode for battery, battery, and thermistor
A thermistor layer of the present invention is configured to be disposed in an electrical current path. The thermistor layer comprises a thermosensitive particle, a plurality of electro-conductive particles covering a surface of the thermosensitive particle, and a binder adhering the electro-conductive particles, the electro-conductive particles form an electro-conductive network, at least the surface of the thermosensitive particle is made of a thermoplastic resin, the thermoplastic resin softens at a temperature lower than a temperature at which the binder softens, and the thermistor layer is provided to become highly resistive due to softening and deformation of the thermoplastic resin.
1 . A thermistor layer configured to be disposed in an electrical current path, wherein
the thermistor layer comprises thermosensitive particles, a plurality of electro-conductive particles covering a surface of each of the thermosensitive particles, and a binder adhering the electro-conductive particles,
the electro-conductive particles form an electro-conductive network,
an average particle diameter of the thermosensitive particles is larger than an average thickness of the thermistor layer,
at least the surface of each of the thermosensitive particles is made of a thermoplastic resin,
the thermoplastic resin has the property of softening at a temperature lower than a temperature at which the binder softens, and
the thermistor layer is provided to become highly resistive due to softening and deformation of the thermoplastic resin.
2 . The thermistor layer according to claim 1 , wherein
the electro-conductive particles form a surface coating layer covering the surface of each of the thermosensitive particles, and
the surface coating layer is a layer in which the electro-conductive network is formed and has a thickness smaller than the average particle diameter of the thermosensitive particles.
3 . An electrode for a battery, the electrode comprising the thermistor layer according to claim 2 , a current collector sheet, and an electrode active material layer provided on the current collector sheet,
wherein the thermistor layer is disposed between the current collector sheet and the electrode active material layer.
4 . A thermistor comprising the thermistor layer according to claim 2 , a first electro-conductive layer, and a second electro-conductive layer,
wherein the thermistor layer is disposed such that a current flows from the first electro-conductive layer to the second electro-conductive layer via the thermistor layer or such that a current flows from the second electro-conductive layer to the first electro-conductive layer via the thermistor layer.
5 . The thermistor layer according to claim 2 , wherein each of the thermosensitive particles is an expanding agent coated with the thermoplastic resin, a thermally expandable microcapsule, or a thermoplastic resin particle.
6 . The thermistor layer according to claim 5 , wherein
an average particle diameter of the electro-conductive particles is 20 nm or more and 100 μm or less, and
an average particle diameter of the thermosensitive particles is 2 μm or more and 1000 μm or less.
7 . An electrode for a battery, the electrode comprising the thermistor layer according to claim 6 , a current collector sheet, and an electrode active material layer provided on the current collector sheet,
wherein the thermistor layer is disposed between the current collector sheet and the electrode active material layer.
8 . A battery comprising the electrode for the battery according to claim 7 , an electrolyte, and a container for housing the electrode for the battery and the electrolyte.
9 . A thermistor comprising the thermistor layer according to claim 6 , a first electro-conductive layer, and a second electro-conductive layer,
wherein the thermistor layer is disposed such that a current flows from the first electro-conductive layer to the second electro-conductive layer via the thermistor layer or such that a current flows from the second electro-conductive layer to the first electro-conductive layer via the thermistor layer.
10 . An electrode for a battery, the electrode comprising the thermistor layer according to claim 5 , a current collector sheet, and an electrode active material layer provided on the current collector sheet,
wherein the thermistor layer is disposed between the current collector sheet and the electrode active material layer.
11 . The thermistor layer according to claim 2 , wherein
an average particle diameter of the electro-conductive particles is 20 nm or more and 100 μm or less, and
an average particle diameter of the thermosensitive particles is 2 μm or more and 1000 μm or less.
12 . An electrode for a battery, the electrode comprising the thermistor layer according to claim 11 , a current collector sheet, and an electrode active material layer provided on the current collector sheet,
wherein the thermistor layer is disposed between the current collector sheet and the electrode active material layer.
13 . The thermistor layer according to claim 1 , wherein each of the thermosensitive particles is an expanding agent coated with the thermoplastic resin, a thermally expandable microcapsule, or a thermoplastic resin particle.
14 . The thermistor layer according to claim 13 , wherein
an average particle diameter of the electro-conductive particles is 20 nm or more and 100 μm or less, and
an average particle diameter of the thermosensitive particles is 2 μm or more and 1000 μm or less.
15 . An electrode for a battery, the electrode comprising the thermistor layer according to claim 14 , a current collector sheet, and an electrode active material layer provided on the current collector sheet,
wherein the thermistor layer is disposed between the current collector sheet and the electrode active material layer.
16 . An electrode for a battery, the electrode comprising the thermistor layer according to claim 13 , a current collector sheet, and an electrode active material layer provided on the current collector sheet,
wherein the thermistor layer is disposed between the current collector sheet and the electrode active material layer.
17 . A thermistor comprising the thermistor layer according to claim 13 , a first electro-conductive layer, and a second electro-conductive layer,
wherein the thermistor layer is disposed such that a current flows from the first electro-conductive layer to the second electro-conductive layer via the thermistor layer or such that a current flows from the second electro-conductive layer to the first electro-conductive layer via the thermistor layer.
18 . The thermistor layer according to claim 1 , wherein
an average particle diameter of the electro-conductive particles is 20 nm or more and 100 μm or less, and
an average particle diameter of the thermosensitive particles is 2 μm or more and 1000 μm or less.
19 . An electrode for a battery, the electrode comprising the thermistor layer according to claim 18 , a current collector sheet, and an electrode active material layer provided on the current collector sheet,
wherein the thermistor layer is disposed between the current collector sheet and the electrode active material layer.
20 . A thermistor comprising the thermistor layer according to claim 18 , a first electro-conductive layer, and a second electro-conductive layer,
wherein the thermistor layer is disposed such that a current flows from the first electro-conductive layer to the second electro-conductive layer via the thermistor layer or such that a current flows from the second electro-conductive layer to the first electro-conductive layer via the thermistor layer.