Porous Silicon Flake Anode Material for Li Ion Batteries
OwnerYunjun Li, Igor Pavlovsky +1inventors
InventorsYunjun Li, Igor Pavlovsky, Mohshi Yang
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Abstract
A silicon based material in the form of sheet-like silicon porous particles in an electrically conductive material matrix wherein said silicon particles contain nano-sized pores, and a method of producing thereof, are disclosed. The material and the method allow obtaining Li ion batteries with high electric charge capacity and improved cycling performance of the battery anode.
Claims15
A lithium ion battery anode material comprising sheet-like porous silicon particles having the thickness not exceeding 150 nm wherein silicon is a doped monocrystalline or polycrystalline silicon with a doping level from ˜105 to ˜1022/cm3.
A method of making lithium ion battery anode material comprising:
- (a) formulating a silicon anode paste comprising sheet-like porous silicon particles, polymers, carbon nanotubes, solvents;
- (b) printing the paste on a copper foil current collector to make a battery anode;
- (c) drying and high temperature treatment of the battery anode in an inert gas environment, wherein the heat treatment process produces a highly electrically conductive battery anode material through carbonizing the comprised polymers into a conductive graphitic matrix which encapsulates sheet-like silicon particles with a carbon layer.
Dependencies are inferred from the claim text.