Jump to main content
Jump to site search


High capacity potassium-ion battery anodes based on black phosphorus

Abstract

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 mAh/g. 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 mAh/g, more than twice of 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 mAh/g for 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.

Back to tab navigation

Supplementary files

Publication details

The article was received on 21 Mar 2017, accepted on 06 Oct 2017 and first published on 06 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA02483E
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
  •   Request permissions

    High capacity potassium-ion battery anodes based on black phosphorus

    I. Sultana, M. M. Rahman, T. Ramireddy, Y. Chen and A. M. Glushenkov, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA02483E

Search articles by author

Spotlight

Advertisements