US 12,590,380 B2 · Electrodeposition of pure phase SnSb from eutectic ethaline solution for sodium-ion and lithium-ion battery anodes

Abstract

A method for electrodeposition of pure phase crystalline SnSb from deep eutectic ethaline is described. Thin films of SnSb were synthesized using a solution containing equimolar Sn(II) and Sb(III) chlorides as precursors, and ethaline (1:2 by weight of choline chloride and ethylene chloride) was used as the solvent for the electrodeposition solution. The purity of the product is important, as the impure phase is found to be detrimental to the material's lifetime as both a sodium-ion and a lithium-ion anode. For sodium-ions, the directly deposited electrode was able to retain 95% capacity after 300 cycles, and only fall below 80% capacity retention after 800 cycles when cycled versus sodium. The electrodeposited SnSb used as a Li-ion battery anode showed stability, only falling below 80% capacity retention after 400 cycles.

Claims18

Dependent claims

A method for electrodeposition of SnSb on a substrate, comprising:

preparing a nonaqueous solution containing equimolar quantities of Sn(II) and Sb(III) salts in a nonaqueous solvent comprising a deep eutectic solvent;
inserting a conducting metal substrate into said nonaqueous solution;
applying a potential more negative than −0.55 V vs. Ag/Ag+ to the conducting metal substrate at 25° C. for sufficient time to form a thin film of pure phase crystalline SnSb thereon;
and
heating said nonaqueous solution before said step of applying the potential for driving off water that is present.

2 more elements

Dependencies are inferred from the claim text.

Electrodeposition of pure phase SnSb from eutectic ethaline solution for sodium-ion and lithium-ion battery anodes

Life of this patent

Electrodeposition of pure phase SnSb from eutectic ethaline solution for sodium-ion and lithium-ion battery anodes

Life of this patent

Abstract

Claims18