High capacity electrodes
An electrode comprises carbon nanoparticles and at least one of metal particles, metal oxide particles, metalloid particles and/or metalloid oxide particles. A surfactant attaches the carbon nanoparticles and the metal particles, metal oxide particles, metalloid particles and/or metalloid oxide particles to form an electrode composition. A binder binds the electrode composition such that it can be formed into a film or membrane. The electrode has a specific capacity of at least 450 mAh/g of active material when cycled at a charge/discharge rate of about 0.1C.
1. An electrode comprising:
(a) carbon nanoparticles; wherein said carbon nanoparticles are in an amount between 5 wt. % and 95 wt. % of an electrode composition;
(b) at least one of metal particles, metal oxide particles, metalloid particles and metalloid oxide particles, wherein the at least one of metal particles, metal oxide particles, metalloid particles and metalloid oxide particles comprises silicon, a silicon oxide, or a combination or alloy thereof;
(c) a surfactant attaching said carbon nanoparticles to said at least one of metal particles, metal oxide particles, metalloid particles and metalloid oxide particles thereby forming said electrode composition; wherein the surfactant is an anionic, cationic, zwitterionic, amphoteric, or ampholytic surfactant; and
(d) 0.1 wt. % to 40 wt. % of a binder for forming said electrode composition into a film or membrane;
wherein said electrode is an anode and has a specific capacity of at least 500 mAh/g of active material when cycled at a charge/discharge rate of about 0.1C.
2. The electrode of claim 1 , wherein said carbon nanoparticles are selected from the group consisting of submicron carbon materials, nanoscale carbon materials, activated carbon nanoparticles, combinations thereof; wherein said nanoscale carbon materials are carbon particles having at least one dimension that is less than 100 nanometers, graphite nanoparticles, graphene nanoparticles, carbon nanotubes and carbon fibers.
3. The electrode of claim 1 , wherein said surfactant is in an amount of between 0.01 wt. % and 10 wt. % comprises one of a sulfate group, a sulfonate group, pyridinium group and an ammonium group.
4. The electrode of claim 3 , wherein said surfactant comprises at least one of sodium dodecylbenzenesulfonate (SDBS), sodium dodecyl sulfate (SDS), and benzyldodecyldimethylammonium bromide (BddaBr).
5. The electrode of claim 1 , wherein said at least one of metal particles, metal oxide particles, metalloid particles and metalloid oxide particles further comprises at least one of the following: boron, tellurium, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, cobalt, vanadium, manganese, niobium, iron, nickel, copper, titanium, zirconium, scandium, yttrium, tin, germanium, oxides of the aforementioned metals and metalloids, and alloys of said at least one of metal particles, metal oxide particles, metalloid particles, and metalloid oxide particles.
6. The electrode of claim 5 , wherein said at least one of metal particles, metal oxide particles, metalloid particles and metalloid oxide particles further comprises at least one of the following oxides: Al 2 O 3 , CuO, MgO, V 2 O 5 , BiO 2 , Sb 2 O 5 , TiO 2 , ZnO, FeO, Fe 2 O 3 , Fe 3 O 4 , CrO 3 , NiO, Ni 2 O 3 , CoO, Co 2 O 3 , and Co 3 O 4 ; and wherein said electrode has specific capacity of at least 600 mAh/g of active material when cycled at a charge/discharge rate of about 0.1C.
7. The electrode of claim 5 , wherein said at least one of metal particles, metal oxide particles, metalloid particles and metalloid oxide particles is in the form of nanoparticles.
8. The electrode of claim 1 , wherein said surfactant has a net negative charge and a pH value greater than the pHpzc of said at least one of metal particles, metal oxide particles, metalloid particles and metalloid oxide particles.
9. The electrode of claim 8 , wherein said surfactant is selected from the group consisting of sodium dodecylbenzenesulfonate (SDBS) and sodium dodecyl sulfate (SDS).
10. The electrode of claim 1 , wherein said surfactant has a net positive charge and a pH value less than the pHpzc of said at least one of metal particles, metal oxide particles, metalloid particles and metalloid oxide particles.
11. The electrode of claim 10 , wherein said surfactant is selected from the group consisting of cetyltrimethylammonium bromide (CTAB), benzyldodecyldimethylammonium bromide (BddaBr), benzyldimethylhexadecylammonium chloride (BdhaCl), didodecyldimethylammonium bromide (DDAB), amprolium hydrochloride (AH), and benzethonium chloride (BC).
12. The electrode of claim 1 , wherein said carbon nanoparticles and said at least one of metal particles, metal oxide particles, metalloid particles and metalloid oxide particles are non-aggregating.
13. The electrode of claim 12 , wherein said carbon nanoparticles and said at least one of metal particles, metal oxide particles, metalloid particles and metalloid oxide particles are dispersed homogeneously.
14. The electrode of claim 1 , wherein said binder comprises at least one of polyvinylidene fluoride (PVDF), polyacrylic acid (PAA), carboxy methyl cellulose (CMC), polyalginate, polyvinyl alcohol (PVA), polyfluorenes, polyurethane, perfluorosulfonic acid polymers, polyethylenimines, poly(1,3-butadiene), poly(acrylonitrile-co-acrylamide), polystyrenebutadiene rubber, and poly(9,9-dioctylfluorene-co-9-fluorenone-co-methybenzoic ester) (PFM).
15. The electrode of claim 14 , wherein said binder comprises polyacrylic acid (PAA).
16. The electrode of claim 1 , further comprising:
(e) a metallic current collector upon which said electrode composition is applied.
17. The electrode of claim 1 , further comprising:
(e) a non-metallic electrically conductive substrate upon which said electrode composition is applied.
18. A battery comprising an anode, a cathode, and an electrolyte interposed therebetween, wherein said anode comprises:
(a) carbon nanoparticles, wherein said carbon nanoparticles are in an amount between 5 wt. % and 95 wt. % of an anode composition;
(b) at least one of metal particles, metal oxide particles, metalloid particles and metalloid oxide particles, wherein the at least one of metal particles, metal oxide particles, metalloid particles and metalloid oxide particles comprises silicon, a silicon oxide, or combination or alloy thereof;
(c) a surfactant attaching said carbon nanoparticles to said at least one of metal particles, metal oxide particles, metalloid particles and metalloid oxide particles to form said anode composition; wherein the surfactant is an anionic, cationic, zwitterionic, amphoteric, or ampholytic surfactant;
(d) 0.1 wt. % to 40 wt. % of a binder for forming said anode composition into a film or membrane;
wherein said anode has a specific capacity of at least 500 mA-h/g of active material when cycled at a charge/discharge rate of about 0.1C.
19. The battery of claim 18 , wherein said surfactant is in an amount of between 0.01 wt. % and 10 wt. % comprises one of a sulfate group, a sulfonate group, pyridinium group and an ammonium group.
20. The battery of claim 18 , wherein said carbon nanoparticles are selected from the group consisting of submicron carbon materials, nanoscale carbon materials, activated carbon nanoparticles, combinations thereof; wherein said nanoscale carbon materials are carbon particles having at least one dimension that is less than 100 nanometers, graphite nanoparticles, graphene nanoparticles, carbon nanotubes and carbon fibers; and wherein said at least one of metal particles, metal oxide particles, metalloid particles and metalloid oxide particles further comprises at least one of the following: boron, tellurium, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, cobalt, vanadium, manganese, niobium, iron, nickel, copper, titanium, zirconium, scandium, yttrium, tin, germanium, oxides of the aforementioned metals and metalloids, or alloys thereof.
21. The battery of claim 18 , further comprising a separator, separating the anode and the cathode.
22. An electrode prepared by the process of:
(a) combining with a surfactant, carbon nanoparticles, and at least one of metal particles, metal oxide particles, metalloid particles and metalloid oxide particles to form an electrode composition, wherein the at least one of metal particles, metal oxide particles, metalloid particles and metalloid oxide particles comprises silicon, a silicon oxide, or combination or alloy thereof; wherein the surfactant is an anionic, cationic, zwitterionic, amphoteric, or ampholytic surfactant, and wherein the surfactant attaches the carbon nanoparticles to the at least one of metal particles, metal oxide particles, metalloid particles and metalloid oxide particles;
(b) combining said electrode composition with a binder;
(c) applying said electrode composition as a layer on a current collector, or forming said electrode composition as a free-standing film or membrane;
wherein said carbon nanoparticles are in an amount between 5 wt. % and 95 wt. % of said electrode composition; and
wherein said electrode is an anode and has a specific capacity of at least 500 mA-h/g of active material when cycled at a charge/discharge rate of about 0.1C.
23. The electrode of claim 22 , wherein steps (a), (b), and (c) are performed sequentially.
24. The electrode of claim 22 , wherein said carbon nanoparticles are selected from the group consisting of submicron carbon materials, nanoscale carbon materials, activated carbon nanoparticles, combinations thereof; wherein said nanoscale carbon materials are carbon particles having at least one dimension that is less than 100 nanometers, graphite nanoparticles, graphene nanoparticles, carbon nanotubes and carbon fibers.
25. The electrode of claim 22 , wherein said surfactant is in an amount of between 0.01 wt. % and 10 wt. % comprises one of a sulfate group, a sulfonate group, pyridinium group and an ammonium group.
26. The electrode of claim 22 , wherein said at least one of metal particles, metal oxide particles, metalloid particles and metalloid oxide particles further comprises at least one of the following: lanthanum, boron, tellurium, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, cobalt, vanadium, manganese, niobium, iron, nickel, copper, titanium, zirconium, scandium, yttrium, tin, germanium, oxides of the aforementioned metals and metalloids, and alloys of said at least one of metal particles, metal oxide particles, metalloid particles, and metalloid oxide particles.
27. The electrode of claim 26 , wherein said at least one of metal particles, metal oxide particles, metalloid particles and metalloid oxide particles further comprises at least one of the following oxides: Al 2 O 3 , CuO, MgO, V 2 O 5 , BiO 2 , Sb 2 O 5 , TiO 2 , ZnO, FeO, Fe 2 O 3 , Fe 3 O 4 , CrO 3 , NiO, Ni 2 O 3 , CoO, Co 2 O 3 , and Co 3 O 4 ; and wherein said electrode has specific capacity of at least 600 mAh/g of active material when cycled at a charge/discharge rate of about 0.1C.
28. The electrode of claim 22 , wherein said at least one of metal particles, metal oxide particles, metalloid particles and metalloid oxide particles is in the form of nanoparticles.