Electrolyte and negative electrode structure
AssigneesGM Global Technology Operations LLC, The Regents of the University of California
InventorsFang LIU, Qiangfeng XIAO, Yunfeng LU, Mei CAI, Fang DAI, Li YANG
Life of this patent
Estimating the term…
Abstract
An example electrolyte includes a solvent, a lithium salt, and an additive selected from the group consisting of a mercaptosilane, a mercaptosiloxane, and combinations thereof. The electrolyte may be used in a method for making a solid electrolyte interface (SEI) layer on a surface of an electrode. A negative electrode structure may be formed from the method.
Claims17
A method for forming a protective solid electrolyte interface (SEI) layer on a surface of an electrode, wherein the method comprises:
- exposing the electrode to an electrolyte, the electrolyte including:
- a solvent;
- a lithium salt;
- and
- an additive selected from the group consisting of:
- a mercaptosilane, a mercaptosiloxane, and combinations thereof, wherein the additive interacts with the surface of the electrode to form the protective solid electrolyte interface (SEI) layer.
A method for pre-lithiating a negative electrode and forming a solid electrolyte interface (SEI) layer on a surface of the negative electrode, wherein the method comprises:
- contacting the negative electrode with an electrolyte including:
- one or more solvents;
- one or more lithium salts;
- and
- one or more additives selected from the group consisting of:
- a mercaptosilane, a mercaptosiloxane, and combinations thereof, wherein the additive is present in an amount ranging from about 2 wt % to about 5 wt % of a total wt % of the electrolyte;
- and
- applying a voltage across the negative electrode that is greater than or equal to about −2 volts to less than or equal to about 3.0 volts for a time greater than or equal to about 2 minutes to less than or equal to about 24 hours, wherein upon application of the voltage one or more thiol groups of the one or more additives reacts with the surface of the electrode to form the protective solid electrolyte interface (SEI) layer.
Dependencies are inferred from the claim text.