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 an electroconductive material, an insulating inorganic substance and a polymer.
1. An electrode for solid-state batteries, the electrode comprising
an electrode active material layer, a current collector and a positive temperature coefficient (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 an electroconductive material, an insulating inorganic substance and a polymer;
when 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 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; and
when a total volume of the electroconductive material, the insulating inorganic substance and the polymer in the A layer is determined as 100 volume %, and when a total volume of the electroconductive material, the insulating inorganic substance and the polymer in the B layer is determined as 100 volume %, a volume ratio V A of the insulating inorganic substance in the A layer is smaller than a volume ratio V B of the insulating inorganic substance in the B layer.
2. The electrode for solid-state batteries according to claim 1 , wherein a value obtained by dividing the volume ratio V A by the volume ratio V B (V A /V B ) is from 0.08 to 0.5.
3. The electrode for solid-state batteries according to claim 1 ,
wherein the PTC resistor layer contains a carbon-containing electroconductive material as the electroconductive material and a fluorine-containing polymer as the polymer, and
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.
4. The electrode for solid-state batteries according to claim 1 , wherein the insulating inorganic substance is a metal oxide.
5. The electrode for solid-state batteries according to claim 1 , wherein the electroconductive material is carbon black.
6. 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 according to claim 1 .