In:
Journal of Materials Chemistry A, Royal Society of Chemistry (RSC), Vol. 10, No. 39 ( 2022), p. 21149-21160
Abstract:
Metal sulfide anodes have trigged extensive academic progress in high-performance sodium-ion batteries (SIBs). However, their poor electronic conductivity and slack diffusion kinetics severely hinder their practical application. Herein, an efficient strategy to overcome the above-mentioned issues via heteroatom doping is proposed. As a demonstration, phosphorus-doped FeS 2 nano-spindles encapsulated by a carbon layer (P–FeS 2 @C) are produced and investigated as an anode material for SIBs. As expected, the as-designed P–FeS 2 @C electrode presents a remarkably high specific capacity (624.4 mA h g −1 at 1.0 A g −1 after 100 cycles), admirable rate performance (401.2 mA h g −1 at 10.0 A g −1 ), and impressive cycling stability (285.4 mA h g −1 at 20.0 A g −1 over 4000 cycles). Furthermore, reaction kinetic analysis shows that the P–FeS 2 @C anode presents a high capacitive contribution ratio and large diffusion coefficient of Na + during the sodium storage process compared with the undoped FeS 2 @C. Simultaneously, density functional theory validates that P doping ameliorates the electronic structure of FeS 2 and induces the formation of a local built-in electric field around the doping sites, reducing the diffusion energy carriers of Na + and accelerating the charge transport.
Type of Medium:
Online Resource
ISSN:
2050-7488
,
2050-7496
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
detail.hit.zdb_id:
2702232-8