Lithium sulfur technology is a promising near-future battery owing to its high theoretical capacity and low cost materials; nonetheless, its commercial viability is hindered owing to the use of lithium anode. Reactive Li is prone to dendritic growth, causing short-circuits and aggravating electrolyte depletion. Here, lithiated silicon sulfur (SLS) full cells are realized by opting all-designs integrated strategy to rationally architecture the carbon matrices for both electrodes. For cathode, N/S- doped high surface area hierarchical porous carbons are designed to host sulfur and its redox species. Anodes are constructed by electrospinning using nano-silicon@void@carbon nanofibers (SVCNF) cross-linked with alginate-citric acid binder network. As-prepared anodes are reversibly alloyed and dealloyed with high reversible capacity of 2132 mAh/g (427 mAh/g ) after 150 cycles at 716 mA/g in ether-based electrolyte. At cathode, polypyrrole activated hierarchical carbon sulfur (PPyr_C/S) exhibits very stable performance with capacity retention around 767 mAh/g after 250 at C/5. After balancing with low Li excess, lithiated SVCNF anodes are coupled with PPyr_C/S cathodes, with initial capacity of 972 mAh/g and 50% capacity retention after 100 cycles at 225 mA/g . Full SLS cells have been appreciated by opting rational architecture of carbon matrices in individual electrodes even at low lithium excess.
Rational design of porous carbon matrices to enable efficient lithiated silicon sulfur full cell / Zubair, Usman; Amici, Julia; Crespiera, Sandra Martinez; Francia, Carlotta; Bodoardo, Silvia. - In: CARBON. - ISSN 0008-6223. - (2019).
|Titolo:||Rational design of porous carbon matrices to enable efficient lithiated silicon sulfur full cell|
|Data di pubblicazione:||2019|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/j.carbon.2019.01.005|
|Appare nelle tipologie:||1.1 Articolo in rivista|