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Ionic liquid and hybrid ionic liquid/organic electrolytes for high temperature lithium-ion battery application

Nareerat Plylahan (Institutionen för fysik, Kondenserade materiens fysik (Chalmers)) ; Manfred Kerner (Institutionen för fysik, Kondenserade materiens fysik (Chalmers)) ; Du Hyun Lim (Institutionen för fysik, Kondenserade materiens fysik (Chalmers)) ; Aleksandar Matic (Institutionen för fysik, Kondenserade materiens fysik (Chalmers)) ; Patrik Johansson (Institutionen för fysik, Kondenserade materiens fysik (Chalmers))
Electrochimica Acta (0013-4686). Vol. 216 (2016), p. 24-34.
[Artikel, refereegranskad vetenskaplig]

Ionic liquid (IL) and hybrid IL/organic electrolytes with pyrrolidinium cation based ILs have been investigated for application in high temperature lithium-ion batteries (HT-LIBs). The IL based electrolytes show high thermal stabilities, up to 340 degrees C, ionic conductivities of > 5 x 10(-3) S cm(-1) at 80 degrees C, and broad electrochemical stability windows: 0-5 V vs. Li+/Li degrees. The performance of LiFePO4 based half-cells at 80 degrees C is promising, delivering ca. 160 mAh g(-1) at 1C, with a rate capability up to 4C and ca. 98% coulombic efficiency. The creation of hybrid IL/organic electrolytes by adding different organic cyclic carbonate solvents reduces viscosity of the electrolytes by 28% at 80 degrees C, thereby improving the ion transport, and further improves the electrochemical performance; higher stability, better rate capability, and >= 99% coulombic efficiency. Overall, the electrolytes proposed have a potential to be applied in HT-LIBs, a concept with large advantages at the vehicle system level. (C) 2016 Elsevier Ltd. All rights reserved.

Nyckelord: Lithium-ion battery, ionic liquid, pyrrolidinium, organic solvents, high temperature

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Denna post skapades 2016-11-16. Senast ändrad 2017-01-16.
CPL Pubid: 245261


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