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Structural influence of silica-based ionogels on their performance as electrolytes for all-solid-state Lithium-ion microbatteries
Hartmann, Korina; Calberg, Cédric; Liquet, Dimitri et al.
2019XX International Sol-Gel Conference
 

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Abstract :
[en] The emerging market of the Internet of Things, smart objects and others increase the demand for micro energy sources. Rechargeable Li-ion batteries are a well-known technology for energy storage. However, safety issues and high production costs constrain progress. Research on solid electrolytes, such as LiPON, was performed to evade leakage. But LiPON suffers from low ionic conductivity and a cost and time intensive production process. Another approach is the substitution of volatile and flammable organic electrolyte solvents with ionic liquids (IL), which display negligible vapor pressure and wide chemical, electrochemical, and thermal stability. Electrolyte solution based on ILs can be confined into inorganic porous networks forming so-called ionogels (IG), which are investigated as solid electrolyte materials. IGs combine low hazard and good ionic conductivity [1]. Silica-based IGs compatible with Li/LiCoO2 systems were prepared in a one-pot sol-gel process. The composition of the IG precursor solution and the influence of trifluoroacetic acid as catalyst were studied to obtain a fast condensation. Homogeneous and transparent IGs were obtained with a gelation time of less than 4 h. The physical properties of the host matrix were characterized by N2 sorption, Hg porosimetry and SEM. The silica host matrices were 3D networks predominantly built from 3-fold condensed silicon centres. The influence of its structural changes on the electrochemical behaviour was studied by varying the catalyst amount and by increasing the IL amount in the gel. The electrochemical performances of the IG were measured with complex impedance spectroscopy and galvanostatic cycling. Results show that IGs with IL amounts nIL/nSiO2~3 may be successfully used as solid electrolyte in Li/LiCoO2 cells. Batteries were prepared, which cycle more than 100 cycles at a rate of C/2 with no evidence of dendritic growth. Impedance characterization reveals the high internal resistivity of these batteries due to the dense structure of the silica matrix.
Disciplines :
Chemistry
Materials science & engineering
Author, co-author :
Hartmann, Korina ;  Université de Liège - ULiège > Department of Chemical Engineering > Génie chimique - Nanomatériaux et interfaces
Calberg, Cédric ;  Université de Liège - ULiège > Department of Chemical Engineering > Génie chimique - Nanomatériaux et interfaces
Liquet, Dimitri ;  Université de Liège - ULiège > Department of Chemical Engineering > Génie chimique - Nanomatériaux et interfaces
Heinrichs, Benoît ;  Université de Liège - ULiège > Department of Chemical Engineering > Génie chimique - Nanomatériaux et interfaces
Language :
English
Title :
Structural influence of silica-based ionogels on their performance as electrolytes for all-solid-state Lithium-ion microbatteries
Publication date :
2019
Event name :
XX International Sol-Gel Conference
Event place :
Saint- Petersbourg, Russia
Event date :
25-30 August 2019
Audience :
International
References of the abstract :
Book of abstracts p. 259
Available on ORBi :
since 29 November 2020

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