Lithium ion batteries | Ricerc@Sapienza

Production of nanostructured electrodes from spent Lithium ion batteries and their application in new energy storage devices

The present work is aimed at demonstrating the potentiality of lithium ion batteries recycling through the production of high added value nanostructured material. Nanostructured electrodic materials were synthesized starting from waste lithium ion batteries (LIBs). Firstly, the metals contained in the electrodic powder of exhausted LIBs were extracted by acid-reducing leaching. After filtration, metals rich solution was separated from graphite.

Novel bis(fluorosulfonyl)imide-based and ether-functionalized ionic liquids for lithium batteries with improved cycling properties

Novel ionic liquids (ILs), which were functionalized with ether oxygens to suppress crystallization and with bis(fluorosulfonyl)imide (FSI) anions to improve ionic conductivity, were synthesized and compared. Electrolyte mixtures were prepared by adding LiFSI to N-ethoxyethyl-N-methylpiperidinium FSI ([P 1,2O2 ][FSI]) and N-ethoxyethyl-N-methylmorpholinium FSI ([M 1,2O2 ][FSI]) in ratio of 1:9 (mol/mol). The electrolyte mixtures were found to exhibit a glass transition temperature between −71 and −93 °C and a decomposition temperature higher than 266 °C.

A novel Li+‐conducting polymer membrane gelled by fluorine‐free electrolyte solutions for Li‐ion batteries

Gel polymer electrolytes (GPEs), composed of poly(vinylidene fluoride) (PVdF), a ternary solvent of ethylene carbonate: propylene carbonate: dimethyl carbonate, and LiBOB, which are characterised by a novel composition with a fluorine‐free lithium salt, are here proposed. GPEs were firstly prepared through a solution casting procedure using the ternary carbonate solution as a solvent (named ex‐situ prepared membranes), and then activated by being immersed in a 0.7 M LiBOB‐carbonate solution.

Iron and lithium-iron alkyl phosphates as nanostructured material for rechargeable batteries

Inorganic/organic hybrid materials composed by iron atoms bonded to an alkyl phosphate can be easilysynthesized by mixing at 110°C iron chlorides with tri-alkyl phosphates.Since structural information on these products are lacking and taking into account that lithium/ironorganic hybrid materials are important in lithium ion battery technology we report here the physico-chemical characterization of different hybrid lithium/iron butylphosphates. These materials are charac-terized by the presence of elongated hexagonal crystals stable up to 315°C.