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Electrolyte additives for lithium ion batteries
In lithium ion batteries, electrolyte additives are compounds that are added with normal electrolytes to improve the battery performance. In this project, new electrolyte additives will be evaluated specifically for NMC/graphite lithium ion cells.
Keywords: Lithium ion battery, electrolyte additives, electrochemistry, life-time studies
Lithium ion battery (LIB) electrolytes (e.g. Lithium hexafluorophosphate salt dissolved in a mixture of ethylene carbonate and ethyl methyl carbonate solvents) serve as ionic conductors and help transport lithium ions between the cathode and anode. With an aim to extend the life-time of LIBs, additive compounds (e.g. as vinylene carbonate (VC)) are added to the normal electrolytes. By reacting with electrolyte-electrode interface, these additives modify certain properties of the lithium ion cells and improve the LIB performance (e.g. better cycleability and longer cycle life).
NMC/graphite lithium ion cells are popular due to their large reversible capacity at moderate potentials resulting in high energy density. At the same time, extending the battery life time of NMC/graphite cells is also important. Hence, new electrolyte additives that are compatible to specific NMC/graphite cells need to be explored and evaluated.
Lithium ion battery (LIB) electrolytes (e.g. Lithium hexafluorophosphate salt dissolved in a mixture of ethylene carbonate and ethyl methyl carbonate solvents) serve as ionic conductors and help transport lithium ions between the cathode and anode. With an aim to extend the life-time of LIBs, additive compounds (e.g. as vinylene carbonate (VC)) are added to the normal electrolytes. By reacting with electrolyte-electrode interface, these additives modify certain properties of the lithium ion cells and improve the LIB performance (e.g. better cycleability and longer cycle life).
NMC/graphite lithium ion cells are popular due to their large reversible capacity at moderate potentials resulting in high energy density. At the same time, extending the battery life time of NMC/graphite cells is also important. Hence, new electrolyte additives that are compatible to specific NMC/graphite cells need to be explored and evaluated.
The main goal of this project is to evaluate the compatibility of the selected new electrolyte additives with different NMC/graphite cells – NMC 811, NMC 622 and NMC 532. The student will test the selected electrolyte additives in the above-mentioned NMC/graphite lithium ion cells and analyze various cell parameters. At the end of this project, the student will be able to find the usefulness of the selected additives for NMC/graphite cells
Your tasks:
• Build lithium ion cells for testing
• Test the redox activity of the selected additives in the selected potential window(s)
• Measure the impedance of the NMC/graphite cells with selected additives
• Measure the cycleability of the NMC/graphite cells with selected additives
• Image the electrode-electrode surface
Requirements:
• Basic electrochemistry
• Willing to learn lithium ion cell building and testing methods
• Interest in electrochemical characterization methods
The main goal of this project is to evaluate the compatibility of the selected new electrolyte additives with different NMC/graphite cells – NMC 811, NMC 622 and NMC 532. The student will test the selected electrolyte additives in the above-mentioned NMC/graphite lithium ion cells and analyze various cell parameters. At the end of this project, the student will be able to find the usefulness of the selected additives for NMC/graphite cells
Your tasks: • Build lithium ion cells for testing • Test the redox activity of the selected additives in the selected potential window(s) • Measure the impedance of the NMC/graphite cells with selected additives • Measure the cycleability of the NMC/graphite cells with selected additives • Image the electrode-electrode surface
Requirements: • Basic electrochemistry • Willing to learn lithium ion cell building and testing methods • Interest in electrochemical characterization methods
Contact Details
Dr. Ramesh Shunmugasundaram
Materials and Device Engineering Group
ramesh.s@iis.ee.ethz.ch
https://made.ee.ethz.ch
+41 (0) 44 632 70 49
Contact Details Dr. Ramesh Shunmugasundaram Materials and Device Engineering Group ramesh.s@iis.ee.ethz.ch https://made.ee.ethz.ch +41 (0) 44 632 70 49