Show simple item record

dc.contributor.authorBlanco, Maria Valeria
dc.contributor.authorRenman, Viktor
dc.contributor.authorVullum-Bruer, Fride
dc.contributor.authorSvensson, Ann Mari
dc.identifier.citationRSC Advances. 2020, 10 (55), 33490-33498.en_US
dc.description.abstractDiatomaceous earth (DE) is a naturally occurring silica source constituted by fossilized remains of diatoms, a type of hard-shelled algae, which exhibits a complex hierarchically nanostructured porous silica network. In this work, we analyze the positive effects of reducing DE SiO2 particles to the sub-micrometer level and implementing an optimized carbon coating treatment to obtain DE SiO2 anodes with superior electrochemical performance for Li-ion batteries. Pristine DE with an average particle size of 17 μm is able to deliver a specific capacity of 575 mA h g−1 after 100 cycles at a constant current of 100 mA g−1, and reducing the particle size to 470 nm enhanced the reversible specific capacity to 740 mA h g−1. Ball-milled DE particles were later subjected to a carbon coating treatment involving the thermal decomposition of a carbohydrate precursor at the surface of the particles. Coated ball-milled silica particles reached stable specific capacities of 840 mA h g−1 after 100 cycles and displayed significantly improved rate capability, with discharge specific capacities increasing from 220 mA h g−1 (uncoated ball-milled SiO2) to 450 mA h g−1 (carbon coated ball-milled SiO2) at 2 A g−1. In order to trigger SiO2 reactivity towards lithium, all samples were subjected to an electrochemical activation procedure prior to electrochemical testing. XRD measurements on the activated electrodes revealed that the initial crystalline silica was completely converted to amorphous phases with short range ordering, therefore evidencing the effective role of the activation procedure.en_US
dc.publisherRoyal Society of Chemistryen_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.titleNanostructured diatom earth SiO2 negative electrodes with superior electrochemical performance for lithium ion batteriesen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.source.journalRSC Advancesen_US
dc.relation.projectNorges forskningsråd: 274969en_US
dc.relation.projectNorges forskningsråd: 295864en_US
dc.description.localcodeOpen Access article. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.en_US

Files in this item


This item appears in the following Collection(s)

Show simple item record

Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal