Sn(TFSI)₂as a suitable salt for the electrodeposition of nanostructured Cu₆Sn₅–Sn composites obtained on a Cu electrode in an ionic liquid

Abstract

Sn nanostructured thin films prepared by electrodeposition in an ionic liquid directly on a Cu substrate provided high performance as Li-ion negative electrodes.

Sn‐Based Alloys Synthesized in an Ionic Liquid at Room Temperature: Cu6Sn5 as a Case Study

“…The scan was performed at 0.05 V s À 1 starting from the open circuit potential (E OCP ) toward cathodic and reversed anodic sides. Concerning the solution of Sn 2 + , we observed a cathodic peak at À 0.17 V vs. Sn 2 + /Sn previously assigned to the reduction of Sn 2 + to Sn 0 and a reoxydation occurring at + 0.10 V. [7] In the case of a 25 mM Cu (TFSI) 2 in [EMIm + ][TFSI À ], the voltammograms stabilized after several cycles ( Figure S4) indicating that side reactions occurred. Thereafter, the CV showed a reduction peak at À 0.02 V vs. Sn 2 + /Sn, followed by an oxidation occurring at + 0.53 V. Such a cathodic peak value cannot be assigned based on standard potential due to the contribution of the solvation energy of copper ions in [EMIm + ][TFSI À ] solvent.…”

“…Concerning the solution of Sn 2+ , we observed a cathodic peak at −0.17 V vs . Sn 2+ /Sn previously assigned to the reduction of Sn 2+ to Sn 0 and a re‐oxydation occurring at +0.10 V . In the case of a 25 mM Cu(TFSI) 2 in [EMIm + ][TFSI − ], the voltammograms stabilized after several cycles (Figure S4) indicating that side reactions occurred.…”

“…To control the chemical composition of Sn‐based alloys, we proposed to use metallic precursors based on TFSI − counter ions dissolved in an [EMIm + ][TFSI − ] ionic liquid. The use of common anion for both metallic precursors and the ionic liquid was shown to be an effective approach to (i) increase the solubility of cations in ILs, especially as compared to conventionally used halide salts, (ii) prevent impurities related to Cl − anions and (iii) enable the successful synthesis of nanosized metals . We selected the tin‐copper system and particularly the Cu 6 Sn 5 chemical composition for its possible use as an anode for lithium‐ion batteries.…”

Sulu Olmayan Ortamlarda Katodik olarak elde edilen Kalay Esaslı Filmin Elektrokimyasal Davranışı

“…Aqueous electrolytes commonly used for tin growth are acidic or alkaline. Non-aqueous electrolytes can be ionic liquids that have studied commonly last decade [11]. Tin is electrodeposited from Sn 2+ electrolyte by applying direct current.…”