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High capacity potassium-ion battery anodes based on black phosphorus

journal contribution
posted 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.

History

Journal

Journal of materials chemistry A

Volume

5

Issue

45

Pagination

23506 - 23512

Publisher

Royal Society of Chemistry

Location

Cambridge, Eng.

ISSN

2050-7488

eISSN

2050-7496

Language

eng

Notes

See 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 classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2017, The Royal Society of Chemistry