Nitrogen-containing compounds as additives for silicon-based Li-ion batteries
Additives for energy storage devices comprising nitrogen-containing compounds 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. Nitrogen-containing compounds may serve as additives to the first electrode, the second electrode, and/or the electrolyte, as well as the separator.
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 nitrogen-containing compound; and
wherein said nitrogen-containing compound is selected from the group consisting of (dicyanatoamino) cyanate; Phenyl Cyanate; and Bisphenol A cyanate ester.
2. The energy storage device of claim 1 , wherein the second electrode is a Si-dominant electrode.
3. 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.
4. 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 nitrogen-containing 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 nitrogen-containing compound is selected from the group consisting of (dicyanatoamino) cyanate; Phenyl Cyanate; and Bisphenol A cyanate ester.
5. The method of claim 4 , wherein the anode is a Si-dominant electrode.
6. The method of claim 5 , 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.