Abstract
Sodium-ion batteries are promising candidates for large-scale grid storage systems and other applica-tions.Their foremost advantage derives from superior environmental credentials,enhanced safety as well as lower raw material costs than lithium-ion batteries.It is still challenging to explore desirable anode material.In this study,FeSe2@CoSe2/FeSe2,with a yolk-shell structure was prepared by ion exchange and selenisation.The FeSe2@CoSe2/FeSe2 prepared as anode material for sodium-ion batteries exhibits excel-lent rate capability due to the synergistic effect of bimetallic selenides and the interfacial effect of the heterostructure.Moreover,it delivers high performance(510 mAh g-1 at 0.2 A g-1),superior rate capa-bility(90％retention at 5 A g-1),and good long-time cycling stability(78％capacity retention after 1800 cycles at a high current density of 2 A g-1).The optimized sodium-ion full cell with FeSe2@CoSe2/FeSe2 as the anode and Na3V2(PO4)3 as the cathode still demonstrates excellent performance.Namely,a ca-pacity of 272 mAh g-1(at 1 A g-1)within the operating voltage from 1 to 3.8 V can be obtained.This work illustrates the potential of bimetallic selenides with heterostructures for performance enhancement of sodium-ion batteries.
基金项目
National Natural Science Foundation of China(21801200)
National Natural Science Foundation of China(22075217)
Open Project of Hunan Key Laboratory of Applied Environmental Photocatalysis(2114504)
Natural Science Foundation of Hubei Province of China(2022CFA001)
NETL
NSTL
万方数据