Prelithiated and methods for prelithiating an energy storage device
AssigneeEnevate Corporation
InventorsBenjamin Yong Park, Frederic Bonhomme, Shiang Jen Teng, Victor E. House
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Abstract
The present disclosure relates to prelithiated Si electrodes, methods of prelithiating Si electrodes, and use of prelithiated electrodes in electrochemical devices are described. There are several characteristics of electrode prelithiation that enable the superior battery performance. First, a prelithiated silicon anode is already in its expanded state during SEI formation, and therefore less of the SEI layer breaks down and reforms during cycling. Second, the prelithiated anode has a lower anode potential, which may also help the cycle performance of an electrochemical device.
Claims23
An energy storage device comprising:
- a first electrode and a second electrode, wherein at least one of the first electrode and the second electrode is a Si-based electrode, and wherein the Si-based electrode comprises a prelithiated silicon active material;
- a separator between the first electrode and the second electrode;
- and
- an electrolyte;
- wherein the prelithiated silicon active material comprises a prelithiation level of above 0% to about 30% that corresponds to LixSi with x ranging from 0.5 to 1.0, respectively, and the prelithiation is from a lithium additive in the electrolyte comprising more lithium ions than what is needed to prelithiate the active material to a level between 0% to about 30%.
An electrode comprising:
- a delithiated silicon active material;
- wherein the delithiated silicon active material is characterized by the formula LiySi, wherein y is greater than 0.5 and less than 1 and a prelithiation of the active material is from a lithium additive in the electrolyte comprising more lithium ions than what is needed to prelithiate the active material to a level between 0% to about 30%.
A method of prelithiating a silicon active material, comprising:
- providing a silicon active material;
- providing an electrolyte;
- providing a lithium source;
- and
- prelithiating the silicon active material using the lithium source, thereby producing a prelithiated silicon active material;
- wherein the prelithiated silicon active material comprises a prelithiation level of above 0% to about 30% that corresponds to LixSi with x ranging from 0.5 to 1.0, respectively, and the prelithiation is from a lithium additive in the electrolyte comprising more lithium ions than what is needed to prelithiate the active material to a level between 0% to about 30%.
Dependencies are inferred from the claim text.