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Membranes 2015, 5(4), 632-645; doi:10.3390/membranes5040632

High Temperature Stable Separator for Lithium Batteries Based on SiO2 and Hydroxypropyl Guar Gum

1
Helmholtz Institute Ulm (HIU), Helmholtzstrasse 11, 89081 Ulm, Germany
2
Karlsruhe Institute of Technology (KIT), P. O. Box 3640, 76021 Karlsruhe, Germany
*
Authors to whom correspondence should be addressed.
Academic Editor: Bruno Scrosati
Received: 16 September 2015 / Accepted: 15 October 2015 / Published: 23 October 2015
(This article belongs to the Special Issue Membranes for Electrochemical Energy Applications 2015)
View Full-Text   |   Download PDF [484 KB, uploaded 23 October 2015]   |  

Abstract

A novel membrane based on silicon dioxide (SiO2) and hydroxypropyl guar gum (HPG) as binder is presented and tested as a separator for lithium-ion batteries. The separator is made with renewable and low cost materials and an environmentally friendly manufacturing processing using only water as solvent. The separator offers superior wettability and high electrolyte uptake due to the optimized porosity and the good affinity of SiO2 and guar gum microstructure towards organic liquid electrolytes. Additionally, the separator shows high thermal stability and no dimensional-shrinkage at high temperatures due to the use of the ceramic filler and the thermally stable natural polymer. The electrochemical tests show the good electrochemical stability of the separator in a wide range of potential, as well as its outstanding cycle performance. View Full-Text
Keywords: separator; hydroxypropyl guar gum (HPG); silicon dioxide (SiO2); lithium batteries; aqueous processing; thermal stability separator; hydroxypropyl guar gum (HPG); silicon dioxide (SiO2); lithium batteries; aqueous processing; thermal stability
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Carvalho, D.V.; Loeffler, N.; Kim, G.-T.; Passerini, S. High Temperature Stable Separator for Lithium Batteries Based on SiO2 and Hydroxypropyl Guar Gum. Membranes 2015, 5, 632-645.

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