Increasing the service life of silicon-based negative electrodes by particles with a silicon oxide and lipon coating
The present invention relates to silicon-based active material for negative electrodes, in particular electrodes with increased service life, in particular for use in batteries, a method for their manufacture, and negative electrodes, batteries, and devices that contain this silicon-based active material.
1. A silicon-based active material for a negative electrode, comprising:
silicon particles having a diameter of 10 to 75 nm, wherein the silicon particles have a silicon core that is provided with at least one first coating and at least one second coating, wherein the at least one first coating is a silicon oxide coating and the at least one second coating is a LiPON coating.
2. The silicon-based active material according to claim 1 , wherein the silicon particles have a diameter of 30 to 50 nm.
3. The silicon-based active material according to claim 1 , wherein the LiPON coating of the silicon particles has a layer thickness of 0.2 to 5 nm.
4. The silicon-based active material according to claim 3 , wherein the LiPON coating of the silicon particles has a layer thickness of 0.5 to 1 nm.
5. The silicon-based active material according to claim 1 , wherein the silicon oxide coating of the silicon particles has a layer thickness of 0.5 to 3 nm.
6. The silicon-based active material according to claims 1 , wherein the silicon oxide is silicon monoxide or silicon dioxide.
7. A silicon-based electrode material that contains the silicon-based active material according to claim 1 .
8. A silicon-based negative electrode that contains the silicon-based active material according to claim 1 .
9. A lithium-ion battery comprising at least one silicon-based negative electrode according to claim 8 .
10. A device comprising at least one lithium-ion battery according to claim 9 .