Method and system for silosilazanes, silosiloxanes, and siloxanes as additives for silicon dominant anodes
Systems and methods for silosilazanes, silosiloxanes, and siloxanes as additives for silicon-dominant anodes in a battery that may include a cathode, an electrolyte, and an anode active material. The active material may comprise 50% or more silicon as well as an additive including one or more of: silosilazane, polysilosilazane, silicon oxycarbides, and polyorganosiloxane. The active material may comprise a film with a thickness between 10 and 80 microns. The film may have a conductivity of 1 S/cm or more. The active material may comprise between 50% and 95% silicon. The active material may be held together by a pyrolyzed carbon film. The anode may comprise lithium, sodium, potassium, silicon, and/or mixtures and combinations thereof. The battery may comprise a lithium ion battery. The electrolyte may comprise a liquid, solid, or gel.
1 . A battery comprising:
a cathode, an electrolyte, and an anode comprising a film, the film comprising:
a binder and
an active material, the active material comprising:
silicon particles and
an additive comprising polysilosilazane;
wherein said polysilosilazane contains Si—C bonds and a dialkylaminosilane;
wherein said film has a thickness between 10 and 80 microns; and
wherein said film is formed from a slurry comprising said binder and said active material.
2 . The battery according to claim 1 , wherein the film has a conductivity of 1 S/cm or more.
3 . The battery according to claim 1 , wherein the active material comprises between 50% and 95% silicon particles by weight.
4 . The battery according to claim 1 , wherein the active material is held together by a pyrolyzed carbon film formed from said binder.
5 . The battery according to claim 1 , wherein the anode comprises lithium, sodium, potassium, silicon, and/or mixtures and combinations thereof.
6 . The battery according to claim 1 , wherein the electrolyte comprises a liquid, solid, or gel.
7 . The battery according to claim 1 , wherein said additive further comprises silicon oxycarbides, polyorganosiloxane or both.
8 . A method of forming a battery:
wherein said battery comprises an anode, a cathode, and an electrolyte, the anode comprising a film; the film comprising a binder and
an active material, the active material comprising:
silicon particles and an additive;
wherein said additive comprises polysilosilazane;
wherein said polysilosilazane contains Si—C bonds and a dialkylaminosilane;
wherein said film has a thickness between 10 and 80 microns that is coated on a substrate;
the method comprising:
forming a slurry comprising said binder and said active material; and
forming said film by coating said substrate with said slurry.
9 . The method according to claim 8 , wherein the film has a conductivity of 1 S/cm or more.
10 . The method according to claim 8 , wherein the active material comprises between 50% and 95% silicon particles by weight.
11 . The method according to claim 8 , wherein the active material is held together by a pyrolyzed carbon film formed from said binder.
12 . The method according to claim 8 , wherein the anode comprises lithium, sodium, potassium, silicon, and/or mixtures and combinations thereof.
13 . The method according to claim 8 , wherein the electrolyte comprises a liquid, solid, or gel.
14 . The method according to claim 8 , wherein said additive further comprises silicon oxycarbides, polyorganosiloxane or both.
15 . An anode for a battery, the anode comprising:
film, the film comprising:
a binder and
an active material, the active material comprising:
silicon particles and
an additive comprising polysilosilazane;
wherein said polysilosilazane contains Si—C bonds and a dialkylaminosilane;
wherein said film has a thickness between 10 and 80 microns; and
wherein said film is formed from a slurry comprising said binder and said active material.
16 . The anode according to claim 15 , wherein said additive further comprises silicon oxycarbides, polyorganosiloxane or both.