The effect of TiO2 nanoparticles and the “liquid phase therapy” on the resistance of the interphase lithium/polymer electrolyte with the introduction of ionic liquid

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Abstract

The effect of treating a metal lithium surface with 1 M LiN(CF3SO2)2 solution in 1,3-dioxolane/1,2-dimethoxyethane (2:1) mixture on the resistance of the lithium/polymer and lithium/nanocomposite electrolyte based on the ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate was studied. It has been shown that “liquid-phase therapy” reduces the resistance at the Li/electrolyte interface by 2.5 times at room temperature and expands the operating temperature range to –30°C. The introduction of TiO2 nanoparticles into the polymer electrolyte, along with “liquid-phase therapy” of both the cathode and the Li-anode, provides a high and stable discharge capacity of the Li//LiFePO4 battery for 100 charge-discharge cycles.

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G. R. Baymuratova

FRC of Problems of Chemical Physics and Medicinal Chemistry RAS

Author for correspondence.
Email: guzalia.rb@yandex.ru
Russian Federation, Chernogolovka

A. V. Yudina

FRC of Problems of Chemical Physics and Medicinal Chemistry RAS

Email: oyarm@icp.ac.ru
Russian Federation, Chernogolovka

K. G. Khatmullina

FRC of Problems of Chemical Physics and Medicinal Chemistry RAS; National Research University “Moscow Energy Institute”

Email: guzalia.rb@yandex.ru
Russian Federation, Chernogolovka; Moscow

A. A. Slesarenko

FRC of Problems of Chemical Physics and Medicinal Chemistry RAS

Email: guzalia.rb@yandex.ru
Russian Federation, Chernogolovka

O. V. Yarmolenko

FRC of Problems of Chemical Physics and Medicinal Chemistry RAS

Email: oyarm@icp.ac.ru
Russian Federation, Chernogolovka

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2. Fig. 1. Impedance plots of Li//Li cells at 20°C with electrolytes PE (1), PE* (2), NPE (3) and NPE* (4), where * are treated with 1M LiTFSI in DOL/DME, and the corresponding equivalent circuit.

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3. Fig. 2. Impedance hodographs of Li//Li cells in the temperature range from –30 to 80°C with PE (a) and NPE (b) electrolytes without treatment, with PE* (c) and NPE* (d), treated with 1M LiTFSI in DOL/DME.

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4. Fig. 3. Characteristics of Li//LiFePO4 cells with PE* (1) and NPE* (2), where (a) charge-discharge profiles for the 5th cycle, (b) dependence of the cathode discharge capacity for cells with PE* (1) and NPE* (2) on the cycle number at a current density of 17 mA/g in the range of 2.6–3.8 V.

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