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

Membranes

Diogo Vieira Carvalho¹  Nicholas Loeffler¹  Guk-Tae Kim¹  Stefano Passerini¹ 

[1] Helmholtz Institute Ulm (HIU), Helmholtzstrasse 11, 89081 Ulm, Germany; E-Mails:

关键词: separator;    hydroxypropyl guar gum (HPG);    silicon dioxide (SiO₂);    lithium batteries;    aqueous processing;    thermal stability;   

DOI  :  10.3390/membranes5040632

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.