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URN: urn:nbn:de:swb:90-527564
DOI: 10.3390/membranes5040632

High temperature stable separator for lithium batteries based on SiO² and hydroxypropyl guar gum

Carvalho, D.V.; Loeffler, N.; Kim, G.-T.; Passerini, S.

A novel membrane based on silicon dioxide (SiO$_{2}$) 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 SiO$_{2}$ 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.

Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Publikationstyp Zeitschriftenaufsatz
Jahr 2015
Sprache Englisch
Identifikator ISSN: 2077-0375
KITopen ID: 1000052756
HGF-Programm 37.01.01; LK 01
Erschienen in Membranes
Band 5
Heft 4
Seiten 632-645
Schlagworte separator, hydroxypropyl guar gum (HPG), silicon dioxide (SiO2), lithium batteries, aqueous processing, thermal stability
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