Transition metal selenides(TMSs)are compounds composed of transition metals and selenium,and they offer a range of chemical and structural diversities that can be exploited to optimize their performance as sodium-ion ...Transition metal selenides(TMSs)are compounds composed of transition metals and selenium,and they offer a range of chemical and structural diversities that can be exploited to optimize their performance as sodium-ion battery(SIB)electrodes.One of the most promising TMSs for SIBs is NiSe,which possesses a high theoretical capacity of 399 mA h g^(−1).However,poor cycling stability and low overall energy density resulted from its structural instability,as well as the poor intrinsic conductivity,limiting its application in SIBs.In this work,in situ interface engineering of NiSe is proposed via chemically anchoring high doping and three-dimensional(3D)carbon nanotubes(CNTs)on the surface of NiSe nanofibers(NiSe@NC/CNTs).The CNTs,which in situ grow in multiple directions,form a connected conductive network that is good for electron transport.In addition,the nano-confined NiSe nanoparticles effectively inhibit the volume expansion of charge and discharge in SIBs.A NiSe@NC/CNT electrode is directly used as an anode for SIBs,showing an excellent long-term cycling stability of 225 mA h g^(−1)after 1000 cycles and high rate capability.The sodium-ion full batteries with the NiSe@NC/CNT anode exhibit a high energy density of 147 W h kg^(−1)at a power density of 244 W kg^(−1),along with stable cycling performance.The sodium ion(de)intercalation process of the NiSe@NC/CNT anode material has been characterized,revealing its charging and discharging mechanism.Theoretical calculations were conducted to investigate the volume change produced by doped N buffer materials during Na+embedding/desequestration,which provides more active sites for sodium ion storage.Our study provides a better understanding of the interface engineering of the TMS electrode and sheds light on the design and optimization of high-performance SIBs.展开更多
Due to their high specific capacity,straightforward manufacture,and plentiful sources,transition metal oxides and dichalcogenides are regarded as the perfect anode materials for sodium ion batteries(SIBs).Among them,M...Due to their high specific capacity,straightforward manufacture,and plentiful sources,transition metal oxides and dichalcogenides are regarded as the perfect anode materials for sodium ion batteries(SIBs).Among them,MoSe_(2)could be used as an SIB anode material due to its evident structural and performance benefits,including its two-dimensional layered structure with a large layer spacing(0.646 nm),a theoretical capacity of up to 4_(2)_(2)mA h g^(-1).展开更多
Owing to the abundance and low price of sodium,researches on sodium-ion batteries(SIBs)as a lithiumion battery(LIB)alternative are emerging as a consensus.It is crucial to develop electrode materials suitable for sodi...Owing to the abundance and low price of sodium,researches on sodium-ion batteries(SIBs)as a lithiumion battery(LIB)alternative are emerging as a consensus.It is crucial to develop electrode materials suitable for sodium storage.In recent years,two-dimensional(2 D)layered transition metal disulfide compounds(TMDs)have trigered interest in the realm of energy and environmental fields.In particular,MoSeis thought to be a suitable material for SIBs due to its wide original layer spacing and high conductivity.Herein,N-doped dual carbon-coated MoSewith multichannel paths(MoSe/multichannel carbon nanofibers(MCFs)@NC)is fabricated via electrospinning,followed by a selenation and carbonization process.The existence of a 3 D conductive network,abundant void spaces,and sufficient electron transportation pathways are conducive to rapid and fast charge transfer kinetics under volume expansion stress.When applied in SIBs,the MoSe/MCFs@NC shows a high capability(319 mA hg^(-1)at 10 A g^(-1)),as well as good cycling stability(303 mA h g^(-1)after 1100 cycles at 10 A g^(-1)).Furthermore,coupled with the Na_(3)V_(2)(PO_(4))_(2)O_(2)F cathode,the full cell also exhibits excellent performance.The theoretical calculation of the MoSe_(2)/MCFs@NC confirms that the superiority of its SIB performance is owing to the strong interaction between the double-doped carbon and MoSe.This scheme provides a wide space for preparing high-performance electrode materials for SIBs.展开更多
基金financially supported by the National Natural Science Foundation of China(No.51902031)the Natural Science Foundation of Jiangsu Province(BK20201049)+1 种基金the Natural Science Foundation of the Jiangsu Higher Education Institutions(22KJA430009)the Science and Technology Development Plan of Suzhou(ZXL2022176).
文摘Transition metal selenides(TMSs)are compounds composed of transition metals and selenium,and they offer a range of chemical and structural diversities that can be exploited to optimize their performance as sodium-ion battery(SIB)electrodes.One of the most promising TMSs for SIBs is NiSe,which possesses a high theoretical capacity of 399 mA h g^(−1).However,poor cycling stability and low overall energy density resulted from its structural instability,as well as the poor intrinsic conductivity,limiting its application in SIBs.In this work,in situ interface engineering of NiSe is proposed via chemically anchoring high doping and three-dimensional(3D)carbon nanotubes(CNTs)on the surface of NiSe nanofibers(NiSe@NC/CNTs).The CNTs,which in situ grow in multiple directions,form a connected conductive network that is good for electron transport.In addition,the nano-confined NiSe nanoparticles effectively inhibit the volume expansion of charge and discharge in SIBs.A NiSe@NC/CNT electrode is directly used as an anode for SIBs,showing an excellent long-term cycling stability of 225 mA h g^(−1)after 1000 cycles and high rate capability.The sodium-ion full batteries with the NiSe@NC/CNT anode exhibit a high energy density of 147 W h kg^(−1)at a power density of 244 W kg^(−1),along with stable cycling performance.The sodium ion(de)intercalation process of the NiSe@NC/CNT anode material has been characterized,revealing its charging and discharging mechanism.Theoretical calculations were conducted to investigate the volume change produced by doped N buffer materials during Na+embedding/desequestration,which provides more active sites for sodium ion storage.Our study provides a better understanding of the interface engineering of the TMS electrode and sheds light on the design and optimization of high-performance SIBs.
基金supported by the Natural Science Foundation of the Jiangsu Higher Education Institutions(22KJA430009)the Science and Technology Development Plan of Suzhou(ZXL2022176)+1 种基金the China Postdoctoral Science Foundation(2022M711686)the Natural Science Foundation of Jiangsu Province(BK20201049).
文摘Due to their high specific capacity,straightforward manufacture,and plentiful sources,transition metal oxides and dichalcogenides are regarded as the perfect anode materials for sodium ion batteries(SIBs).Among them,MoSe_(2)could be used as an SIB anode material due to its evident structural and performance benefits,including its two-dimensional layered structure with a large layer spacing(0.646 nm),a theoretical capacity of up to 4_(2)_(2)mA h g^(-1).
基金financially supported by the National Natural Science Foundation of China(51801030)the Natural Science Foundation of Guangdong Providence(2018A030310571)+2 种基金the Science and Technology Development Plan of Suzhou(ZXL2021176)China Postdoctoral Science Foundation(2022M711686)Jiangsu Provincial Funds for the Young Scholars(BK20190978)。
文摘Owing to the abundance and low price of sodium,researches on sodium-ion batteries(SIBs)as a lithiumion battery(LIB)alternative are emerging as a consensus.It is crucial to develop electrode materials suitable for sodium storage.In recent years,two-dimensional(2 D)layered transition metal disulfide compounds(TMDs)have trigered interest in the realm of energy and environmental fields.In particular,MoSeis thought to be a suitable material for SIBs due to its wide original layer spacing and high conductivity.Herein,N-doped dual carbon-coated MoSewith multichannel paths(MoSe/multichannel carbon nanofibers(MCFs)@NC)is fabricated via electrospinning,followed by a selenation and carbonization process.The existence of a 3 D conductive network,abundant void spaces,and sufficient electron transportation pathways are conducive to rapid and fast charge transfer kinetics under volume expansion stress.When applied in SIBs,the MoSe/MCFs@NC shows a high capability(319 mA hg^(-1)at 10 A g^(-1)),as well as good cycling stability(303 mA h g^(-1)after 1100 cycles at 10 A g^(-1)).Furthermore,coupled with the Na_(3)V_(2)(PO_(4))_(2)O_(2)F cathode,the full cell also exhibits excellent performance.The theoretical calculation of the MoSe_(2)/MCFs@NC confirms that the superiority of its SIB performance is owing to the strong interaction between the double-doped carbon and MoSe.This scheme provides a wide space for preparing high-performance electrode materials for SIBs.
