Cyclodextrin-based compounds and their derivatives for silicon-based li-ion batteries
Additives for energy storage devices comprising cyclodextrin-based compounds and their derivatives are disclosed. The energy storage device comprises a first electrode and a second electrode, where at least one of the first electrode and the second electrode is a Si-based electrode, a separator between the first electrode and the second electrode, and an electrolyte composition. Cyclodextrin-based compounds may serve as additives to the first electrode, the second electrode, and/or the electrolyte.
1. An energy storage device comprising:
a first electrode and a second electrode, wherein one or both of the first electrode and the second electrode is a Si-based electrode;
a separator between the first electrode and the second electrode; and
an electrolyte composition; wherein
one or more of said first electrode, said second electrode, and said electrolyte composition comprises at least one additive, wherein said additive comprises a cyclodextrin-based compound; and wherein said cyclodextrin-based compound comprises one of α-Cyclodextrin, sulfated sodium salt hydrate; Hexakis (6-O-tertbutyl-dimethylsilyl)-α-cyclodextrin; Succinyl-α-cyclodextrin; (2-Hydroxypropyl)-α-cyclodextrin; Hexakis(2,3,6-tri-O-octyl)-α-cyclodextrin; and 6-Azido-6-deoxy-α-cyclodextrin.
2. The energy storage device of claim 1 , wherein the second electrode is a Si-dominant electrode.
3. The energy storage device of claim 1 , wherein the second electrode comprises a self-supporting composite material film.
4. The energy storage device of claim 2 , wherein the Si-dominant electrode comprises:
greater than 0% and less than about 95% by weight of silicon particles, 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 substantially continuous phase that holds the Si-dominant electrode together such that the silicon particles are distributed throughout the Si-dominant electrode.
5. A method of forming an energy storage device, the method comprising:
forming an energy storage device comprising a cathode, an electrolyte composition, and an anode;
wherein one or more of said anode, said cathode, and said electrolyte composition comprises at least one additive, wherein said additive comprises a cyclodextrin-based compound;
wherein one or both of said cathode and said anode is formed using, at least, the following steps:
said electrode material is mixed to create a slurry;
said additive is added to said slurry;
said slurry is coated on metal foil; and
the coated metal foil is dried; and wherein said cyclodextrin-based compound comprises one of α-Cyclodextrin, sulfated sodium salt hydrate; Hexakis (6-O-tertbutyl-dimethylsilyl)-α-cyclodextrin; Succinyl-α-cyclodextrin; (2-Hydroxypropyl)-α-cyclodextrin; Hexakis(2,3,6-tri-O-octyl)-α-cyclodextrin; and 6-Azido-6-deoxy-α-cyclodextrin.
6. The method of claim 5 , wherein the anode is a Si-dominant electrode.
7. The method of claim 5 , wherein the anode comprises a self-supporting composite material film.
8. The method of claim 6 , wherein the Si-dominant electrode comprises:
greater than 0% and less than about 95% by weight of silicon particles, 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 substantially continuous phase that holds the Si-dominant electrode together such that the silicon particles are distributed throughout the Si-dominant electrode.