Article (Scientific journals)
Aqueous processing of flexible, free-standing Li4Ti5O12 electrodes for Li-ion batteries
Piffet, Caroline; Vertruyen, Bénédicte; Caes, Sébastien et al.
2020In Chemical Engineering Journal, 397
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Keywords :
Flexible electrode; Free-standing electrode; Aqueous suspension; Li4Ti5O12; Viscosity; Li-ion battery
Abstract :
[en] The development of Li-ion batteries for the new flexible technologies should also consider environment and safety issues. Therefore, this research focused on developing an aqueous waterbased process for the preparation of free-standing, CNT-free and flexible Li4Ti5O12 (LTO) electrodes, where LTO itself was also obtained through an aqueous route. The electrodes contain carbon black, polyvinyl alcohol (PVA) and polyethylene glycol (PEG) 500 or 6000 g/mol. The SEM and IR-ATR analyses confirmed a good distribution of all components. 2 wt% PEG 6000 or 3 wt% PEG 500 with respect to LTO were the optimum ratios to obtain free-standing flexible electrodes. The suspensions were studied by rheological analysis: the system was found to be stable (G’ modulus above G’’ modulus) and the role of the polymers and carbon in the suspensions has been investigated by viscosity measurements. Excellent electrochemical performances (up to 157mAh/g at 1C rate) were obtained for PEG6000-based current-collector-free electrodes. Mild mechanical stress applied to the electrodes before the measurements allowed to enhance the performances, which could be related to the creation of tiny cracks which led to better penetration of the electrolyte in the electrode.
Disciplines :
Chemistry
Author, co-author :
Piffet, Caroline  ;  Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT
Vertruyen, Bénédicte  ;  Université de Liège - ULiège > Département de chimie (sciences) > Chimie inorganique structurale
Caes, Sébastien 
Thomassin, Jean-Michel ;  Université de Liège - ULiège > Département de chimie (sciences) > Chimie des macromolécules et des matériaux organiques (CERM)
Broze, Guy ;  Université de Liège - ULiège > Département de chimie (sciences) > Chimie des macromolécules et des matériaux organiques (CERM)
Malherbe, Cédric ;  Université de Liège - ULiège > Département de chimie (sciences) > Chimie analytique inorganique
Boschini, Frédéric ;  Université de Liège - ULiège > Plateforme APTIS
Cloots, Rudi ;  Université de Liège - ULiège > Département de chimie (sciences) > Vice-Recteur à la vie étud. et aux infrastr. immobilières
Mahmoud, Abdelfattah  ;  Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT
Language :
English
Title :
Aqueous processing of flexible, free-standing Li4Ti5O12 electrodes for Li-ion batteries
Publication date :
2020
Journal title :
Chemical Engineering Journal
ISSN :
1385-8947
eISSN :
1873-3212
Publisher :
Elsevier, Netherlands
Volume :
397
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 25 May 2020

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