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Issue 9, 2016
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What use for polysilsesquioxane lithium salts in lithium batteries?

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Abstract

Aryl-containing lithium perfluorosulfonates form unquestionably a family of salts having fairly good electrochemical performances, especially high cation transference numbers. Here, this family was extended to polysilsesquioxanes in which every silicon atom bears one lithium perfluorosulfonate group, via a sol–gel synthesis involving an original organotrialkoxysilane salt precursor. Despite their high molecular weights, these macro polyanions were found to be highly soluble in polar solvents such as acetonitrile or ethanol. NMR spectroscopy and SEC analysis were consistent with high molecular weight species and a random arrangement of cyclic and/or branched structures. These salts featured a wide electrochemical stability window up to 4 V in acetonitrile solution, while PFG NMR spectroscopy disclosed that the self diffusion coefficient of the macro polyanion decreased significantly with respect to a parent monomer salt chosen as a reference. The potential of high molecular weight polysilsesquioxane salts as lithium source nanofillers in liquid and polymer electrolytes was then discussed in light of the calculated lithium cation transference number.

Graphical abstract: What use for polysilsesquioxane lithium salts in lithium batteries?

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Publication details

The article was received on 29 Mar 2016, accepted on 03 Jul 2016 and first published on 04 Jul 2016


Article type: Paper
DOI: 10.1039/C6NJ00979D
New J. Chem., 2016,40, 7657-7662

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    What use for polysilsesquioxane lithium salts in lithium batteries?

    M. Meyer, L. Viau, A. Mehdi, S. Monge, P. Judeinstein and A. Vioux, New J. Chem., 2016, 40, 7657
    DOI: 10.1039/C6NJ00979D

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