Silicon particles for battery electrodes
Silicon particles for active materials and electro-chemical cells are provided. The active materials comprising silicon particles described herein can be utilized as an electrode material for a battery. In certain embodiments, the composite material includes greater than 0% and less than about 90% by weight of silicon particles. The silicon particles have an average particle size between about 0.1 μm and about 30 μm and a surface including nanometer-sized features. The composite material also includes greater than 0% and less than about 90% by weight of one or more types of carbon phases. At least one of the one or more types of carbon phases is a substantially continuous phase.
1. A composite material comprising:
greater than 0% and less than about 90% by weight of silicon particles, the silicon particles having an average particle size between about 0.1 μm and about 30 μm and a surface roughness comprising nanometer-sized features; and
greater than 0% and less than about 90% by weight of one or more types of carbon phases, wherein at least one of the one or more types of carbon phases is a continuous phase comprising hard carbon and holding the composite material together.
2. The composite material of claim 1 , wherein the nanometer-sized features comprise a silicon material.
3. The composite material of claim 1 , wherein the nanometer-sized features comprise an average feature size between about 1 nm and about 1 μm.
4. The composite material of claim 1 , wherein the average particle size of the silicon particles is between about 1 μm and about 20 μm.
5. The composite material of claim 1 , wherein the average particle size of the silicon particles is between about 5 μm and about 20 μm.
6. The composite material of claim 4 , wherein the average particle size of the silicon particles is between about 1 μm and about 10 μm.
7. The composite material of claim 1 , wherein the average particle size of the silicon particles is between about 0.5 μm and about 2 μm.
8. The composite material of claim 1 , wherein the silicon particles further comprise an average surface area per unit mass between about 1 m 2 /g and about 30 m 2 /g.
9. The composite material of claim 1 , wherein the silicon particles further comprise a purity of above 99.9999%.
10. An electrode configured to be used in an electro-chemical cell comprising the composite material of claim 1 .
11. The electrode of claim 10 , wherein the electrode is an anode.