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Sitinamaluwa, Hansinee Sakunthala
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article
Nanoporous SiOx coated amorphous silicon anode material with robust mechanical behavior for high-performance rechargeable Li-ion batteries
Abstract
Silicon is a promising anode material for rechargeable Li-ion battery (LIB) due to its high energy density andrelatively low operating voltage. However, silicon based electrodes suffer from rapid capacity degradation duringelectrochemical cycling. The capacity decay is predominantly caused by (i) cracking due to large volume variationsduring lithium insertion/extraction and (ii) surface degradation due to excessive solid electrolyte interface(SEI) formation. In this work, we demonstrate that coating of a-Si thin film with a Li-active, nanoporous SiOx layercan result in exceptional electrochemical performance in Li-ion battery. The SiOx layer provides improvedcracking resistance to the thin film and prevent the active material loss due to excessive SEI formation, benefitingthe electrode cycling stability. Half-cell experiments using this anode material show an initial reversible capacityof 2173 mAh g<sup>1</sup> with an excellent coulombic efficiency of 90.9%. Furthermore, the electrode shows remarkablecapacity retention of ~97% after 100 cycles at C/2 charging rate. The proposed anode architecture is free from Liinactive binders and conductive additives and provides mechanical stability during the charge/discharge process.