Salt-philic solvent-phobic (sp2) interfacial coating for anodes
AssigneeThe Board of Trustees of the Leland Stanford Junior University
InventorsZhenan BAO, Yi CUI, Zhuojun HUANG, Jiancheng LAI
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Abstract
A salt-philic solvent-phobic (SP2) polymer coating on a lithium anode, sodium anode, or a silicon anode selectively transports salt over solvent and is configured to promote salt-derived SEI formation on the anode. The SP2 coating can include a polymer backbone, a first side chain comprising a first moiety having salt affinity, and a second side chain comprising a second moiety immiscible with polar aprotic solvents.
Claims19
A salt-philic solvent-phobic (SP2) polymer coating on a anode, wherein the anode comprises lithium, sodium, silicon, or a mixture of any two or more thereof;
- and wherein the SP2 polymer selectively transports salt over solvent and is configured to promote salt-derived SEI formation.
An electrochemical cell comprising:
- an electrolyte comprising a lithium salt, a sodium salt, or a mixture thereof;
- an anode comprising silicon, lithium, sodium, or a mixture thereof;
- a polymer coating disposed on the anode, the polymer coating comprising:
- a polymer backbone;
- a first side chain comprising a first moiety having salt affinity;
- and
- a second side chain comprising a second moiety immiscible with polar aprotic solvents.
A method of preparing a coating on a lithium anode, sodium anode, or a silicon anode, the method comprising:
- spin coating or drip coating the lithium anode, sodium anode, or the silicon anode with a polymer dissolved in a solvent,
- after the spin coating or the drip coating, drying the lithium anode, the sodium anode, or the silicon anode;
- wherein the polymer comprises:
- a polymer backbone;
- a first side chain comprising a first moiety having salt affinity;
- and
- a second side chain comprising a second moiety immiscible with polar aprotic solvents.
Dependencies are inferred from the claim text.