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Issue 32, 2011
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Nanocomposites based on borate esters as improved lithium-ion electrolytes

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Borate esters with different lengths of ethyleneoxy units were investigated as electrolyte solvents for lithium salts such as lithium triflate, perchlorate, bis(trifluoromethanesulfonyl)imide, bis(pentafluoroethanesulfonyl)imide and bis(oxalato)borate. The ionic conductivity of the salt solutions was measured to be of the order of 10−3 to 10−4 S cm−1 at room temperature. Transference number measurements for the borate esterlithium perchlorate system indicated roughly equal contributions of cations and anions to the total conductivity, while the borate ester–lithium bis(oxalato)borate showed predominant anionic conductivity. Nanocomposite electrolytes were prepared by heterogeneous doping of the borate esters with silica. Composites with 10 nm silica particles exhibited low-viscous electrolyte behavior with a clear but modest conductivity enhancement at very low volume fractions of silica and a depression of the conductivity value at higher volume fractions. In the case of fumed silica (7 nm) the nanocomposites had at a sufficiently high volume fraction and a jelly, transparent appearance with the favorable mechanical properties of a high-viscous semi-solid without noteworthy decrease in the Li ion conductivity. In particular the last material with its combination of favourable electrical, mechanical and optical properties, promises to be a viable candidate for various applications (Li-based batteries, solar cells).

Graphical abstract: Nanocomposites based on borate esters as improved lithium-ion electrolytes

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Supplementary files

Article information

20 Mar 2011
16 May 2011
First published
07 Jul 2011

J. Mater. Chem., 2011,21, 11838-11843
Article type

Nanocomposites based on borate esters as improved lithium-ion electrolytes

N. Kaskhedikar, Y. Karatas, G. Cui, J. Maier and H.-D. Wiemhöfer, J. Mater. Chem., 2011, 21, 11838
DOI: 10.1039/C1JM11189B

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