CHARACTERISTICS AND PERFORMANCE OF RECHARGEABLE LITHIUM ION BATTERY BASED ON LiTFSI AND BMIMTFSI IONIC LIQUID

• Main Author: RENI SEPTIANA (NIM 20213028), ATUT
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/21310
• Institution: Institut Teknologi Bandung

Lithium ion battery is one of electrical power storage for portable electronic devices. Beside on cathode and anode materials, electrolyte of lithium ion battery plays an important role in determining battery performance, especially for high power application such as electric vehicle. Generally, lithium ion battery consists of lithium salt such as lithium hexafluorophosphate (LiPF6), in organic carbonate solvents and additives. However the conventional solvent has some drawbacks if it will be used for electrical vehicle using big current and operating at high temperature. Because of this drawback, the selection of another lithium salt such as lithium bis (trifluoromethylsulfonyl) imide (LiTFSI) that can be combined with ionic liquid become necessary to be studied. In this research, characteristcs of electrolyte based on LiTFSI with ionic liquid and without ionic liquid (BMIMTFSI) as well as performance of battery cell formed from the electrolyte were investigated. Based on the measurement, LiTFSI had better ionic conductivity than LiPF6, even it could be improved by addition of BMIMTFSI ionic liquid. Moreover, the result of cyclic voltammetry characterization showed that these electrolyte had good cyclic stability and reversible reaction. Charge discharge characterization of battery used LiTFSI eletrolyte had highest capacity which was appropriate with the result of the electrochemical impedance spectroscopy characterization. However, the addition of ionic liquid BMIMTFSI could not increase the battery performance. It was supposed due to the charge polarization effect on the surface of anoda and cathode which came from cation and anion of BMIMTFSI.