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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
Ionic liquid electrolytes supporting high energy density in sodium-ion batteries based on sodium vanadium phosphate
C V Manohar1, Tiago Correia Mendes2, Mega Kar2
1Electrochemical Energy Storage Laboratory, Department of Energy Science and Engineering, IIT Powai, Mumbai-400076, India. sagar.mitra@iitb.ac.in and IITB-Monash Research Academy, IIT Powai, Mumbai-400076, India and ARC Centre of Excellence for Electro materials Science, School of Chemistry, Monash University, Victoria, Australia. douglas.macfarlane@monash.edu.
Abstract:
Sodium-ion batteries (SIBs) are widely considered as alternative, sustainable, and cost-effective energy storage devices for large-scale energy storage applications. In this work, an easily fabricated sodium vanadium phosphate-carbon composite (NVP@C) cathode material shows a good rate capability, and long cycle life (89% capacity retention after 5000 cycles at a rate of 10C) with an ionic liquid electrolyte for room temperature sodium metal batteries. The electrochemical performance of a full-cell sodium ion battery with NVP@C and hard carbon electrodes was also investigated at room temperature with an ionic liquid electrolyte. The battery exhibited 368 W h kg-1 energy density and 75% capacity retention after 100 cycles, outperforming the organic electrolyte-based devices.
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Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:

