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. 2022 Feb 7;61(7):e202114024.
doi: 10.1002/anie.202114024. Epub 2021 Dec 29.

Single-Ion Lithium Conducting Polymers with High Ionic Conductivity Based on Borate Pendant Groups

Gregorio Guzmán-González  1 , Soline Vauthier  1   2 , Marta Alvarez-Tirado  1   2 , Stéphane Cotte  2 , Laurent Castro  2 , Aurélie Guéguen  2 , Nerea Casado  1 , David Mecerreyes  1   3
Affiliations

Single-Ion Lithium Conducting Polymers with High Ionic Conductivity Based on Borate Pendant Groups

Gregorio Guzmán-González et al. Angew Chem Int Ed Engl. .

Abstract

A family of single-ion lithium conducting polymer electrolytes based on highly delocalized borate groups is reported. The effect of the nature of the substituents on the boron atom on the ionic conductivity of the resultant methacrylic polymers was analyzed. To the best of our knowledge the lithium borate polymers endowed with flexible and electron-withdrawing substituents presents the highest ionic conductivity reported for a lithium single-ion conducting homopolymer (1.65×10-4 S cm-1 at 60 °C). This together with its high lithium transference number t Li + =0.93 and electrochemical stability window of 4.2 V vs Li0 /Li+ show promise for application in lithium batteries. To illustrate this, a lithium borate monomer was integrated into a single-ion gel polymer electrolyte which showed good performance on lithium symmetrical cells (<0.85 V at ±0.2 mA cm-2 for 175 h).

Keywords: Boron-Based Polymers; Lithium Batteries; Polymer Electrolytes; Polymerizable Boron-Lithium Salts.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Design strategy for the borate lithium monomers and image of a homopolymer electrolyte membrane.
Figure 2
Figure 2
a) Synthetic route for the preparation of methacrylic lithium borate‐based monomers and b) chemical structures of SLICPEs, the yields for each of the reactions are included in the Supporting Information.
Figure 3
Figure 3
1H NMR spectra in D2O for synthesized SLICPEs: a) pLBB(O6FiP)2, b) pLBB(OGlyO6FiP), and c) pLBB(OGly)2, and d) 1B NMR spectra for these SLICPEs i–iii, respectively.
Figure 4
Figure 4
Temperature dependence of ionic conductivity for SLICPEs Boron‐based with several oxy‐substituents (pLBB(OR)2). Aliphatic groups: a) pLBB(OMe)2, b) pLBB(OEt)2, c) pLBB(OiP)2; fluorinated groups: d) pLBB(O3FEt)2, e) pLBB(O6FiP)2; solvating groups: f) pLBB(OGly)2, g) pLBB(OAc)2, and h) pLBB(OGlyO6FiP).
Figure 5
Figure 5
GPE based on LBB(OGlyO6FiP): a) concept scheme, b) polarization resistance at different current densities c) Li+ plating/stripping curves of Li0/GPE‐BB/Li0 symmetric cell at a current density of 0.2 mA cm−2.
See this image and copyright information in PMC

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