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High capacity potassium-ion battery anodes based on black phosphorus
journal contributionposted on 07.12.2017, 00:00 authored by I Sultana, Md Mokhlesur RahmanMd Mokhlesur Rahman, T Ramireddy, Ying (Ian) ChenYing (Ian) Chen, A M Glushenkov
Potassium-ion batteries are a new class of high voltage electrochemical energy storage cells that may potentially complement or replace lithium-ion batteries in many applications. Graphite is considered as a prospective anode material for these batteries but its demonstrated capacity is only 270 mA h g-1. This manuscript studies a novel type of nanocomposite anodes based on black phosphorus as their main active component, with a much higher capacity in potassium-ion batteries. These anode materials are able to deliver a first cycle capacity as high as 617 mA h g-1, more than twice the capacity of graphite in potassium cells. Quick depotassiation is achievable in the electrodes under certain conditions. Based on the data of X-ray diffraction analysis, it is proposed that black phosphorus operates via an alloying-dealloying mechanism with potassium and the end product of the electrochemical transformation is a KP alloy (implying a theoretical capacity of 843 mA h g-1for phosphorus in potassium cells). This work emphasizes the feasibility of potassium-ion battery anode materials with high gravimetric capacities, comparable with those of high capacity anode materials for lithium-ion and sodium-ion batteries.
JournalJournal of materials chemistry A
Pagination23506 - 23512
PublisherRoyal Society of Chemistry
NotesSee also : Correction: High capacity potassium-ion battery anodes based on black phosphorus (Journal of Materials Chemistry A (2017) 5 (23506-23512) DOI: 10.1039/C7TA02483E). Link to correction listed below.
Publication classificationC1.1 Refereed article in a scholarly journal
Copyright notice2017, The Royal Society of Chemistry
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potassium-ion battery anodesblack phosphorushigh voltageelectrochemical energystorage cellsgraphitenanocomposite anodesScience & TechnologyPhysical SciencesTechnologyChemistry, PhysicalEnergy & FuelsMaterials Science, MultidisciplinaryChemistryMaterials ScienceENERGY-STORAGELITHIUM-IONELECTRODECOMPOSITE