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THE STUDY OF LITHIUM PLATING/STRIPPING IN SUPERCONCENTRATED ELECTROLYTESтезисы доклада
- Авторы: Voronin K., Rulev A., Itkis D.
- Сборник: Сборник тезисов || Международной конференции молодых ученых "Актуальные проблемы современной электрохимии и электрохимического материаловедения"
- Том: 1
- Тезисы
- Год издания: 2017
- Место издания: Skoltech Center for Electrochemical Energy Storage
- Аннотация: THE STUDY OF LITHIUM PLATING/STRIPPING IN SUPERCONCENTRATED ELECTROLYTES K. Voronin, A. Rulev, D. Itkis, MSU, 119991, Russian Federation, Moscow, Leninskie Gory, 1 voronin_ka@mail.ru Currently, the rapid development of modern technologies requires a continuous increase in performance of energy accumulation and storage systems. That’s because creation of a new generation of batteries with high specific energy and power is highly demanded. Metallic lithium is one of the most promising anode materials for lithium-based rechargeable batteries, including promising lithium-sulfur, lithium-air and other systems [1-3]. The main reason that prevents the successful introduction of lithium-metal batteries into operation is associated with the formation of non-uniform lithium deposits during the charging process. In this work, we examine lithium plating in "solvent - in - salt" (SIS) electrolytes with typical salt concentration of up to 5 M [4]. We performed cyclic voltammetry using Ni disk as the working electrode. Metallic lithium was employed as a counter electrode, Ag+/Ag electrode was used as a reference. Cyclic voltammetry of lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) solution in prorylene carbonate reveals the expansion of electrochemical stability window range with increasing electrolyte concentration, as well as the shift of the lithium redox potential in positive direction. Results of galvanostatic cycling of symmetrical lithium cells allow us to assume that increased electrolyte concentration (more than 4 moles of salt per 1 l of solvent) leads to more uniform lithium plating at the current density of 0.1 mA/cm2. Although we found that the number of cycles until cell death is noticeably increased for highly concentrated electrolytes, further detailed studies of the morphology of resulting lithium precipitates is required. 1. Zhong Ma, Xianxia Yuan. A Review of Cathode Materials and Structures for Rechargeable Lithium-Air Batteries. Energy Environ. Sci.,140, 15 (2015). 2. G. Bieker, M. Winter. Electrochemical in situ investigations of SEI and dendrite formation on the lithium metal anode. Phys.Chem.Chem.Phys., 8670. 17 (2015). 3. Wu Xu, Jiulin Wang. Lithium metal anodes for rechargeable batteries. Energy Environ. Sci., 515. 7 (2014). 4. J. Qian, A. Wesley A. Henderson, Wu Xu. High rate and stable cycling of lithium metal anode. Nat.Commun. 564. 2–8 (2015). 5. Li, L. et al. Transport and electrochemical properties and spectral features of non-aqueous electrolytes containing LiFSI in linear carbonate solvents. J. Electrochem. Soc. 158, A74–A82 (2011). 6. Best, A., Bhatt, A. & Hollenkamp, A. Ionic liquids with the bis (fluorosulfonyl) imide anion: electrochemical properties and applications in battery technology J. Electrochem. Soc. 157, A903–A911 (2010).
- Добавил в систему: Воронин Кирилл Андреевич