Electrode for solid-state batteries and solid-state battery
An electrode for solid-state batteries, comprising a PTC resistor layer, and a solid-state battery comprising the electrode. The electrode may be an electrode for solid-state batteries, wherein the electrode comprises an electrode active material layer, a current collector and a PTC resistor layer which is disposed between the electrode active material layer and the current collector and which is in contact with the electrode active material layer; wherein the PTC resistor layer contains a carbon-containing electroconductive material, an insulating inorganic substance and a fluorine-containing polymer.
1. An electrode for solid-state batteries, the electrode comprising:
an electrode active material layer;
a current collector; and
a PTC resistor layer disposed between the electrode active material layer and the current collector, the PTC resistor layer being in contact with the electrode active material layer,
wherein the PTC resistor layer contains a carbon-containing electroconductive material, an insulating inorganic substance and a fluorine-containing polymer,
wherein a hardness of a surface of the PTC resistor layer that contacts the electrode active material layer, is 0.36 GPa or less,
wherein the PTC resistor layer is divided into an A layer and a B layer in order from nearest to furthest from the electrode active material layer so that, at any point of the PTC resistor layer, a ratio of a thickness of the A layer to a thickness of the B layer is 1:2 in a thickness direction of the PTC resistor layer,
wherein a value obtained by dividing an atomic percentage of carbon atoms contained in the A layer by an atomic percentage of fluorine atoms contained in the A layer is from 2.4 to 3.9, and
wherein a content of the insulating inorganic substance in the A layer is smaller than a content of the insulating inorganic substance in the B layer.
2. The electrode for solid-state batteries according to claim 1 , wherein the hardness of the surface of the PTC resistor layer that contacts the electrode active material layer is from 0.22 GPa to 0.36 GPa.
3. The electrode for solid-state batteries according to claim 1 , wherein the insulating inorganic substance is a metal oxide.
4. The electrode for solid-state batteries according to claim 1 , wherein the carbon-containing electroconductive material is carbon black.
5. A solid-state battery comprising a cathode, an anode and an electrolyte layer disposed between the cathode and the anode, wherein at least one of the cathode and the anode is the electrode for solid-state batteries defined by claim 1 .
6. The electrode for solid-state batteries according to claim 1 , wherein a carbon amount in the A layer is larger than a carbon amount in the B layer.