ABSTRACT A new spray coating water-based process is here proposed for the rapid and reliable larg... more ABSTRACT A new spray coating water-based process is here proposed for the rapid and reliable large-scale production of self-standing Li-ion battery electrodes using truly natural microfibrillated cellulose as binder. The graphite/carbon black microfibrillated cellulose slurry was spray coated on a wet paper substrate which, subsequently pressed and dried on a conventional pilot paper machine, led to the formation of a bilayered electrode with excellent mechanical properties, cycling performances vs Li metal comparable to those of anodes with standard composition, (i.e. Young Modulus of 2.5 GPa and specific capacity of 350 mAh g−1 at 0.1 C) but a Coulombic efficiency (ca. 98% in the first 50 cycles) which needs to be improved to maintain good cycling performances in Li-ion systems. This work demonstrated that well-established industrial papermaking techniques and materials can be adapted to the elaboration of well-functioning electrodes thus paving the way for the transfer the Li-ion battery industrial area of high-throughput paper production technologies.
ABSTRACT Methacrylic-based thermo-set gel-polymer electrolytes obtained by the easy and reliable ... more ABSTRACT Methacrylic-based thermo-set gel-polymer electrolytes obtained by the easy and reliable photo-polymerisation process and mechanically reinforced by a cellulose handsheet (paper) for flexible lithium batteries application are here presented. Adhesion between cellulose and polymer is improved by "in situ" grafting supported by benzophenone; the ionic conductivity of the electrolyte is enhanced by the use of specifically designed handsheets containing alumina. Thermal and mechanical properties of the new membranes are characterised and the effect of the different composition of the reinforcement on the ionic conductivity of the membranes is discussed.
ABSTRACT Keratin extracted from wool by sulphitolysis, up to a content of 15 wt/wt% was used as a... more ABSTRACT Keratin extracted from wool by sulphitolysis, up to a content of 15 wt/wt% was used as a natural reinforcing agent for cross-linked polymers obtained by photopolymerization of thiol-ene systems. The keratin-based photocured coatings obtained show significant improvement in terms of thermal stability, crosslinking density, Tg values and mechanical properties. Moreover, a clear increase of the biodegradability of the starting thiol-ene polymer matrix was induced by the presence of the keratin biopolymer as reinforcement.
ABSTRACT A new spray coating water-based process is here proposed for the rapid and reliable larg... more ABSTRACT A new spray coating water-based process is here proposed for the rapid and reliable large-scale production of self-standing Li-ion battery electrodes using truly natural microfibrillated cellulose as binder. The graphite/carbon black microfibrillated cellulose slurry was spray coated on a wet paper substrate which, subsequently pressed and dried on a conventional pilot paper machine, led to the formation of a bilayered electrode with excellent mechanical properties, cycling performances vs Li metal comparable to those of anodes with standard composition, (i.e. Young Modulus of 2.5 GPa and specific capacity of 350 mAh g−1 at 0.1 C) but a Coulombic efficiency (ca. 98% in the first 50 cycles) which needs to be improved to maintain good cycling performances in Li-ion systems. This work demonstrated that well-established industrial papermaking techniques and materials can be adapted to the elaboration of well-functioning electrodes thus paving the way for the transfer the Li-ion battery industrial area of high-throughput paper production technologies.
ABSTRACT Methacrylic-based thermo-set gel-polymer electrolytes obtained by the easy and reliable ... more ABSTRACT Methacrylic-based thermo-set gel-polymer electrolytes obtained by the easy and reliable photo-polymerisation process and mechanically reinforced by a cellulose handsheet (paper) for flexible lithium batteries application are here presented. Adhesion between cellulose and polymer is improved by "in situ" grafting supported by benzophenone; the ionic conductivity of the electrolyte is enhanced by the use of specifically designed handsheets containing alumina. Thermal and mechanical properties of the new membranes are characterised and the effect of the different composition of the reinforcement on the ionic conductivity of the membranes is discussed.
ABSTRACT Keratin extracted from wool by sulphitolysis, up to a content of 15 wt/wt% was used as a... more ABSTRACT Keratin extracted from wool by sulphitolysis, up to a content of 15 wt/wt% was used as a natural reinforcing agent for cross-linked polymers obtained by photopolymerization of thiol-ene systems. The keratin-based photocured coatings obtained show significant improvement in terms of thermal stability, crosslinking density, Tg values and mechanical properties. Moreover, a clear increase of the biodegradability of the starting thiol-ene polymer matrix was induced by the presence of the keratin biopolymer as reinforcement.
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Papers by Roberta Bongiovanni