title: High Temperature Stable Separator for Lithium Batteries Based on SiO₂ and Hydroxypropyl Guar Gum.
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.
authors.affiliation: Helmholtz Institute Ulm (HIU), Helmholtzstrasse 11, 89081 Ulm, Germany. diogo.carvalho@kit.edu.|Karlsruhe Institute of Technology (KIT), P. O. Box 3640, 76021 Karlsruhe, Germany. diogo.carvalho@kit.edu.
authors.forename: Diogo Vieira
authors.initials: DV
authors.lastname: Carvalho
authors.affiliation: Helmholtz Institute Ulm (HIU), Helmholtzstrasse 11, 89081 Ulm, Germany. nicholas.loeffler@kit.edu.|Karlsruhe Institute of Technology (KIT), P. O. Box 3640, 76021 Karlsruhe, Germany. nicholas.loeffler@kit.edu.
authors.forename: Nicholas
authors.initials: N
authors.lastname: Loeffler
authors.affiliation: Helmholtz Institute Ulm (HIU), Helmholtzstrasse 11, 89081 Ulm, Germany. guk-tae.kim@kit.edu.|Karlsruhe Institute of Technology (KIT), P. O. Box 3640, 76021 Karlsruhe, Germany. guk-tae.kim@kit.edu.
authors.forename: Guk-Tae
authors.initials: GT
authors.lastname: Kim
authors.affiliation: Helmholtz Institute Ulm (HIU), Helmholtzstrasse 11, 89081 Ulm, Germany. stefano.passerini@kit.edu.|Karlsruhe Institute of Technology (KIT), P. O. Box 3640, 76021 Karlsruhe, Germany. stefano.passerini@kit.edu.
authors.forename: Stefano
authors.initials: S
authors.lastname: Passerini
keywords: aqueous processing; hydroxypropyl guar gum (HPG); lithium batteries; separator; silicon dioxide (SiO2); thermal stability