Ionic liquid has been utilized as safe electrolyte solution for lithium-ion batteries. Reversible charge / discharge cycling of the graphite electrode in the ionic liquid has been achieved with polyacrylic acid polymer binder, which can suppress the organic cation intercalation to the graphite. Cycleability of the graphite-silicon composite electrodes prepared with polyacrylate binder was significantly improved in comparison to the conventional PVdF binder, and it has been demonstrated that the reversible cycling with 1000 mAh g^-1 for 30 cycling test is possible in ionic liquid. The possibility of the safe and high-energy lithium-ion battery is discussed through the preliminary study on Li₂MnO₃-LiCo_1/3Ni_1/3Mn_1/3O₂ based positive electrode and graphite-silicon-polyacrylate composite negative electrode with the ionic liquid electrolyte.

Date Published: 29 April 2010
PDF: 7 pages
Proc. SPIE 7683, Energy Harvesting and Storage: Materials, Devices, and Applications, 76830F (29 April 2010); doi: 10.1117/12.855629

Published in SPIE Proceedings Vol. 7683:
Energy Harvesting and Storage: Materials, Devices, and Applications
Nibir K. Dhar; Priyalal S. Wijewarnasuriya; Achyut Kumar Dutta, Editor(s)