Formulation of a New Type of Electrolytes for LiNi_1/3Co_1/3Mn_1/3O₂ Cathodes Working in an Ultra-Low Temperature Range

Abstract:

A new type of electrolytes for low temperature operation of Li-ion batteries was formulated in this work. Instead of LiPF₆, LiBF₄ and LiODFB were used to form this new type of electrolytes, although LiPF₆ is the mostly chosen solute in the state-of-the-art Li-ion electrolytes. It was found although a LiBF₄-based electrolyte had a lower ionic conductivity than that of a LiODFB-based electrolyte, a LiODFB-based electrolyte demonstrated improved low temperature performance. In particular, at-30°C, a Li-ion cell with 1M LiODFB dissolved in a 1:2:5 (wt.) propylene carbonate (PC)/ethylene carbonate (EC)/ethyl methyl carbonate (EMC) mixed solvent delivered 86% of the capacity obtained at 20°C. Furthermore, the cells with a LiODFB-based electrolyte showed lower polarization at-30°C. The above results suggest that beside the ionic conductivity of an electrolyte as a limitation to the low temperature operation of Li-ion batteries, there was interface impedance having effect on it. Analysis of cell impedance revealed that reduced charge-transfer resistance by using LiODFB resulted in improved low temperature performance of Li-ion batteries.

• Periodical: Advanced Materials Research (Volumes 455-456)
• Pages: 258-264
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.455-456.258
• Online since: January 2012
• Authors: Chun Wei Yang, Yong Huan Ren, Bo Rong Wu, Feng Wu
• Keywords: Component, Electrolyte, LiNi_1/3Co_1/3Mn_1/3O₂, LiODFB, Lithium-Ion Battery, Ultra-Low Temperature Range

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