Cathode of accumulator, associated accumulator and battery
The present invention relates to composite material comprising a matrix and a metallic layer located at at least one surface of said composite material, said matrix comprising at least one polymer and a first population of particles of at least one electronically conducting metal, said layer comprising a second population of particles of at least one electronically conducting metal, a method for preparing such composite material and applications thereof.
1. A cathode of electrochemical accumulator comprising:
an electrode,
a current collector,
an interface layer, the interface layer being coated on the current collector, and the interface layer being also in contact with the electrode and having a thickness of less than 5 micrometers,
wherein the electrode is made in a first composition consisting of a first intercalation material and a first binder material,
wherein the interface layer provides with an increase of retention of capacity of the electrochemical accumulator of at least 10%,
wherein the interface layer comprises a second composition including a second binder material and a second conductive additive,
wherein a content of the second binder material is greater than or equal to 30% by weight of the interface layer, and
wherein a content of the first binder material is less than 5% by weight.
2. The cathode according to claim 1 , wherein the first binder material consists in one or more polymers.
3. The cathode according to claim 1 , wherein the interface layer has a thickness greater than or equal to 10 nanometers.
4. The cathode according to claim 1 , wherein the interface layer has a thickness of between 50 nanometers and 1 micrometer.
5. The cathode according to claim 1 , wherein the collector is a metal sheet.
6. The cathode according to claim 1 , wherein the second binder material consists of one or more polymers.
7. The cathode according to claim 1 , wherein a content of the second conductive additive is greater than or equal to 10% by weight of the interface layer.
8. An electrochemical accumulator, comprising:
a cathode according to claim 1 ; and
an electrolyte including a solvent or solvent mixture.
9. The electrochemical accumulator according to claim 8 , wherein the accumulator is a lithium-ion accumulator.
10. A battery comprising a set of accumulators, wherein at least one accumulator is an electrochemical accumulator according to claim 8 .
11. The cathode according to claim 1 , wherein the interface layer provides with an increase of the retention of capacity of the electrochemical accumulator of at least 20%.