LiFePO4/Li Batteries with Mixtures of Carbonate and Ionic Liquid [EMIM]+[TFSI]- as High Properties and Safety Electrolyte

Fei Li; Shao Jun Wang; Li Wei; Wei Na  Tao; Xue Yang Dong; Hua Liu

doi:10.4028/www.scientific.net/AMM.275-277.2375

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 275-277LiFePO4/Li Batteries with Mixtures of Carbonate...

LiFePO₄/Li Batteries with Mixtures of Carbonate and Ionic Liquid [EMIM]⁺[TFSI]^- as High Properties and Safety Electrolyte

Abstract:

The electrolyte optimum composition consists of 1mol/L LiTFSI in the [EMIM]⁺[TFSI]^- mixed with EC and DMC in weight ratio of 60:20:20. The LiFePO₄/Li cell using 1 mol/L LiTFSI/([EMIM]⁺[TFSI]^-/EC/DMC) as electrolyte show that the first coulomb efficiency was 90% and the first discharge capacity was 168mAh g^-1. The 15th reversible capacities were maintain 157mAh g^-1 at 0.2C. Compared with traditional organic electrolyte and pure IL electrolyte, IL-based mixed electrolyte have good coulomb efficiencies and higher charge and discharge performances. The lithium transference number of IL-based mixed electrolyte at room temperature are 0.59. Thermal stability of IL-based mixed electrolyte higher than traditional organic electrolyte, and show almost non-flammability by the burning tests.

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Periodical:

Applied Mechanics and Materials (Volumes 275-277)

Pages:

2375-2380

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.275-277.2375

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Online since:

January 2013

Authors:

Fei Li, Shao Jun Wang, Li Wei, Wei Na Tao, Xue Yang Dong, Hua Liu

Keywords:

Electrolyte, Ionic Liquid (IL), LiFePO₄, Safety, Thermal Stability, Transference Number

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