Tin in an active support matrix
View Patent ↗An anode material made from nanoparticles, said anode material including a homogeneous mixture of lithium-alloying nanoparticles with active support matrix nanoparticles, is provided. The active support matrix nanoparticle is a compound that participates in the conversion reaction of the lithium battery. The compound is preferably a transition metal compound, with said compound including a nitride, carbide, oxide or combination thereof. An electrode manufactured from the anode material preferably has a porosity of between 5 and 80% and more preferably has a porosity between 10 and 50%. The anode material nanoparticles preferably have a mean linear dimension of between 2 and 500 nanometers, and more preferably have a mean linear dimension of between 2 and 50 nanometers.
1. An anode material in a lithium battery comprising:
a plurality of electrochemically active non-lithiated support nanoparticles, said active non-lithiated support nanoparticles undergoing a conversion reaction upon lithiation; and a plurality of lithium-alloying nanoparticles, said lithium-alloying nanoparticles being homogenously admixed with said active non-lithiated support nanoparticles to form an anode active material for a lithium battery.
2. The invention of claim 1 , wherein said lithium-alloying nanoparticles are unlithiated nanoparticles.
3. The invention of claim 1 , wherein said lithium-alloying nanoparticles are lithiated nanoparticles.
4. The invention of claim 1 , wherein said active nanoparticles include a transition metal.
5. The invention of claim 4 , wherein said transition metal is selected from the group consisting of cobalt, copper, iron, nickel, manganese and combinations thereof.
6. The invention of claim 1 , wherein at least one of said plurality of active nanoparticles has a mean linear dimension of less than 200 nanometers.
7. The invention of claim 1 , wherein said active nanoparticles are selected from the group consisting of a metal-oxide, metal-nitride, metal-sulfide, metal-fluoride, metal-phosphide and combinations thereof.
8. The invention of claim 7 , wherein said active nanoparticles are selected from the group consisting of Co 3 O 4 , CuO, FeF 3 , Cu 3 N, Ge 3 N 4 and combinations thereof.
9. The invention of claim 1 , wherein said lithium-alloying nanoparticles have a composition selected from the group consisting of: tin, silicon, germanium, lead, antimony, aluminum, tin alloys and silicon alloys.
10. The invention of claim 1 , wherein at least one of said plurality of active nanoparticles and plurality of lithium-alloying nanoparticles has a mean linear dimension of between 1 and 999 nanometers.
11. The invention of claim 1 , wherein at least one of said plurality of active nanoparticles and plurality of lithium-alloying nanoparticles has a mean linear dimension of between 2 and 500 nanometers.
12. The invention of claim 1 , wherein at least one of said plurality of active nanoparticles and plurality of lithium-alloying nanoparticles has a mean linear dimension of between 2 and 50 nanometers.
13. The invention of claim 1 , wherein at least one of said plurality of active nanoparticles and plurality of lithium-alloying nanoparticles has a mean linear dimension of between 2 and 20 nanometers.
14. The invention of claim 1 , wherein said anode active material further comprises an additive, said additive selected from the group consisting of a binding element, a conductivity enhancer, an ionic conductivity enhancer, an adhesion promoter and combinations thereof, for the purpose of forming an anode.
15. The invention of claim 14 , wherein said anode active material and said additive are used to form an anode, said anode combined with a cathode, a separator and an electrolyte to form a battery.
16. An anode material in a lithium battery comprising:
a plurality of electrochemically non-lithiated active support nanoparticles;
a plurality of lithium-alloying nanoparticles, said lithium-alloying nanoparticles being homogenously admixed with said non-lithiated active support nanoparticles to form an anode active material; and
said anode active material defining a void volume.
17. The invention of claim 16 , wherein said void volume is comprised of a plurality of porosity channels.
18. The invention of claim 16 , wherein said void volume is comprised of a plurality of expansion accommodation pores.
19. The invention of claim 16 , wherein said void volume is comprised of a plurality of porosity channels and a plurality of expansion accommodation pores.
20. The invention of claim 19 , wherein at least one of said plurality of expansion accommodation pores contains at least one lithium-alloying nanoparticle therein.
21. The invention of claim 19 wherein the mean linear dimension of said expansion accommodation pores are 2 to 5 times the mean linear dimension of an unlithiated lithium-alloying nanoparticle.
22. The invention of claim 19 wherein the mean linear dimension of said expansion accommodation pores are 2 to 4 times the mean linear dimension of an unlithiated nanoparticle.
23. The invention of claim 19 wherein the mean linear dimension of said expansion accommodation pores are 2 to 3 times the mean linear dimension of an unlithiated lithium-alloying nanoparticle.
24. The invention of claim 16 , wherein said anode active material further comprises an additive, said additive selected from the group consisting of a binding element, a conductivity enhancer, an ionic conductivity enhancer, an adhesion promoter and combinations thereof, for the purpose of forming an anode.
25. The invention of claim 19 , wherein said anode material and said additive are used to form an anode, said anode combined with a cathode, a separator and an electrolyte to form a battery.