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SM ISO690:2012 KUBLANOVSKY, Valeriy, GLOBA, Natalia, NIKITENKO, Vasyl, BABENKOV, Eugen, ŞMATOC, Iurii. Properties of tin films electrodeposited from different complexes as anodes for lithium-ion batteries. In: Achievements and perspectives of modern chemistry, 9-11 octombrie 2019, Chişinău. Chisinau, Republic of Moldova: Tipografia Academiei de Ştiinţe a Moldovei, 2019, p. 120. ISBN 978-9975-62-428-2. |
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Achievements and perspectives of modern chemistry 2019 | ||||||
Conferința "International Conference "Achievements and perspectives of modern chemistry"" Chişinău, Moldova, 9-11 octombrie 2019 | ||||||
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Pag. 120-120 | ||||||
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As the anode material lithium-ion batteries (LIB) graphite is widely used, which provides more than a thousand charge-discharge cycles. However, anodes based on carbon materials are characterized by low specific capacity (372 mA·h·g-1), low discharge rate, and relatively narrow temperature interval of operation. Therefore, the development of new anodic materials for LIB with high values of specific capacity and discharge current density is very important. As a possible alternative to carbon materials, it is proposed to use thin electrolytic films of tin or its alloys, in particular with nickel, cobalt, copper, zinc, and antimony in LIB. In modern electroplating, the use of metal complexes is one of the most simple and controlled methods for producing functional coatings with metals and alloys. The combination of properly selected ligands for complex, including polyligands, electrolytes allows to control the slowdown of the electrode process, the structure and properties of the obtained coatings. The morphology and structure of the obtained coatings depend not only on the parameters of electrolysis, but also on the composition of the electrochemically active complex (EAC), which is directly discharged on the electrode. The comparative electrochemical properties of tin films obtained from complex (pyrophosphate (Na4P2O7), tartrate (Na2tart), citrate (Na3citr) and citrate-trilonate (Na3citr/Na3H2edta) electrolytes as anode materials in lithium-ion batteries have been investigated using the methods of potential dynamic galvanostatic sweeps in 1 M ethylene carbonate – dimethyl carbonate solution. The magnitudes of the peak currents of lithium intercalation-deintercalation, depending on the nature of the ligand, decrease in the series: tart2– < citr3– < edta4– < P2O72– ions. It is shown that the nature of the ligand affects the current yield of tin, the composition of EAC and the mechanism of the process. This suggests that the composition of the discharging complex predetermines the morphology and properties of tin films and, consequently, their stability, specific capacity and efficiency of cycling in LIB. The specific capacity of thin tin films obtained from complex electrolytes and the efficiency of cycling in aprotic solvents with a lithium anode is determined not only by the nature of the ligand, but also by the anion of the tin(II) salt. The specific discharge capacity of tin films obtained from pyrophosphate electrolyte (1000 mA·h·g-1), as anodes of lithium-ion batteries, is significantly higher compared to the capacity of tin films obtained from citrate-trilonate (750 mA·h·g-1) citrate (500 mA·h·g-1) and tartrate (400 mA·h·g-1) electrolytes. Apparently, this is due to the optimal porosity of electrolytic tin films obtained from the pyrophosphate electrolyte. The most stable characteristics (the value of the specific capacity and the ability to reversible cycling in lithium systems) are characteristic of tin films obtained from citrate electrolyte based on tin (II) chloride. |
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