Abstract
Dual-ion batteries(DIBs)have attracted great attention due to their affordable prices,environmental friendliness,and high operating voltage.However,the conventional graphite anode in DIBs has draw-backs such as unsatisfactory capacity and worrying safety.MoS2 is considered to be a competitive anode material that exhibits large capacity due to its unique layered structure for cation insertion/extraction.Nevertheless,the sluggish reaction kinetics of MoS2 does not match the cathode side,which makes the constructed full DIBs show poor rate ability.Here,a flower-like MoS2/polyaniline composite electrode(MoS2-PANI)where PANI was grown in situ between layers of MoS2 nanosheets was designed.In this design,the inserted PANI can broaden the layer distance of MoS2 to facilitate cation diffusion and pre-vent the restacking of nanosheets.Furthermore,PANI is also expected to increase the conductivity and relieve the volume changes during repeated charge/discharge cycles.Benefiting from that,the MoS2-PANI electrode delivered a reversible capacity of 561.91 mA h g-1 at 5 A g-1 in half-cell test.Moreover,when coupled with a mildly expanded graphite(MEG)cathode,the obtained MEG//MoS2-PANI DIB shows ex-cellent rate ability with.a reversible discharge capacity of 86.62 mA h g-1 and a desirable energy density of 308.83 W h kg-1 at 20 C.These results provide some inspiration for the design of high-rate DIBs.
基金项目
山东省自然科学基金(ZR2020QE048)
国家自然科学基金(21905304)
State Key Laboratory of Heavy Oil Processing(SKLHOP202101006)
National Defense Science and Technology Innovation Special Zone Project(22-05-CXZX-04-04-29)
NETL
NSTL
万方数据