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# Plastic crystal as electrolyte for lithium-ion battery

ФИО
Колесников Роман Константинович
Электронная почта
6551fa6c32824aroman.kolesnikov@skoltech.ru
Номинация
Материаловедение
Институт
Новых материалов и нанотехнологий (ИНМиН)
Кафедра
Материаловедения полупроводников и диэлектриков
ФИО научного руководителя
к.ф-м.н. Малинкович М.Д.
Академическая группа
МП-14-1
Наименование тезиса
Plastic crystal as electrolyte for lithium-ion battery
Тезис

Today world has great demand for alternative sources of energy. These sources require a way to transport energy, since most of alternative 'green' energy is located in remote areas. Therefore, there is a big interest in cheap, safe, rechargeable battery of high voltage, capacity and capability. One of several possible technologies is use of lithium-ion batteries due to its high gravimetric energy density. However, most lithium-ion batteries have a safety drawback, since highly conductive liquid organic electrolytes are hazardous (flammable, volatile), whereas solid state and polymer electrolytes have low ionic conductivity at room temperatures. Therefore, there is a need for a different type of electrolyte which would be representing the following qualities: it should have high ionic conductivity $$\sigma_{Li} > 10^{-4}$$ S/cm, low electronic conductivity $$\sigma_{e} < 10^{-10}$$S/cm, retention of electrode/electrolyte interface, it should not react with electrodes, it should not decompose in battery operational temperature range, it also should be neither toxic, nor explosive. One such type of electrolyte is plastic crystal, which is a combination of Ionic Liquid with lithium salt and an addition of liquid organic electrolyte. This combination is very stable, has high ionic conductivity of $$2 \times 10^{-4}$$S/cm at room temperature, it also can accommodate any stresses at the electrode/electrolyte interface that occur during battery cycling due to its plasticity and it is not hazardous, because Ionic Liquid prevents it from being flammable.

In our work we have been focused on analysis of N-methyl-N-propyl-piperidinium hexafluorophosphate ($$PP_{13}PF_{6}$$) with $$LiPF_6$$ and N-methyl-N-propyl-piperidinium tetrafluoroborate $$PP_{13}BF_4$$ with $$LiBF_4$$, both with addition of EC:DEC solvent, as possible electrolytes for lithium ion batteries. These Ionic Liquids based on piperidinium cation have a wide electrochemical window of stability. In order to characterize resulting plastic crystals, we performed Cycling Voltammetry, galvanostatic charge-disharge and Impedance Spectroscopy measurements.