Prevention of dendritic plating of lithium
First Claim
1. A method for non-dendritic plating of lithium at lithium deposition voltages by utilizing non-aqueous electrolytes containing lithium salts aprotic organic solvents and addition agents having metallic elements capable of coplating with lithium to form lithium rich intermetallics or alloys wherein the concentration of said additive agents does not exceed the amount which will render the lithium more noble by one and a half volts from the normal lithium EMF activity.
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Abstract
A method, a cell, an electrolyte and an additive for the non-dendritic deposition of lithium is described.
The additive which causes the non-dendritic deposition of lithium from non-aqueous electrolytes and particularly organic electrolytes is a metal, reducible by lithium and capable of forming lithium-rich metallics or alloys.
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Citations
8 Claims
- 1. A method for non-dendritic plating of lithium at lithium deposition voltages by utilizing non-aqueous electrolytes containing lithium salts aprotic organic solvents and addition agents having metallic elements capable of coplating with lithium to form lithium rich intermetallics or alloys wherein the concentration of said additive agents does not exceed the amount which will render the lithium more noble by one and a half volts from the normal lithium EMF activity.
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5. A non-aqueous electrolyte for non-dendritic lithium plating comprising a non-aqueous aprotic solvent selected from the following:
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Propylene carbonate, alkyl formates, alkyl acetates, butyrates, methyl orthoacetate, ethyl orthoacetate, ethyl orthoformate, tetrahydrofuran, methoxymethane, methyoxyethane, esters derived from ethylene glycol and polyethylene glycol, dioxane, dioxolane, acetaldehyde, acetone, acetonitrile, propionitrile, benzonitrile, formamide, N, N dimethylacetamide, N, N dimethyl methyl carbamate, and tetramethylurea, having dissolved therein a conductive salt of lithium and an additive agent having a metal component reducible by lithium and capable of coplating with lithium at lithium deposition voltages in the form of lithium rich intermetallics or alloys. - View Dependent Claims (6, 7, 8)
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Specification