Tin sulfide(SnS_(2))is a promising anodematerial for sodium/potassium-ion batteries(SIBs/PIBs)due to its large interlayer spacing and high theoretical capacity.However,its application is hindered by sluggish kinetics,...Tin sulfide(SnS_(2))is a promising anodematerial for sodium/potassium-ion batteries(SIBs/PIBs)due to its large interlayer spacing and high theoretical capacity.However,its application is hindered by sluggish kinetics,volume expansion,and low conductivity.In this work,a synergistic engineering route is proposed that combining environmentally friendly chlorella with sulfurized polyacrylonitrile(SPAN)to achieve green doping and dual-mode confinement SnS_(2)-based anode.The SPANmatrix prevents SnS2 agglomeration,enhances charge transfer,and improves structural stability,while phosphorus(P)doping accelerates“solid‒solid”conversion kinetics.The SnS_(2)‒P‒SPAN anode demonstrates outstanding sodium/potassium storage performance across a wide temperature range(‒40◦C to 70◦C),delivering high reversible capacities,excellent rate capability,and exceptional long-term cycling stability.The reliability of the as-developed strategy in a SnS_(2)‒P‒SPAN//NaNi_(0.4)Fe_(0.2)Mn_(0.4)O_(2)full cell is also verified,which shows strong practical potential with high capacity and long durability(241 mAh g^(−1)/800 cycles/0.5 A g^(−1)/25℃;159 mAh g^(−1)/400 cycles/0.5 A g−1/60℃;105 mAh g^(−1)/800 cycles/0.5 A g^(−1)/‒15℃).The associated electrochemical mechanisms of SnS_(2)‒P‒SPAN are elucidated through comprehensive electrochemical tests,in/ex situ analyses.The theoretical calculation unveil that P-doping helps to enhance the adsorption capacity of the Na^(+)and discharge products.Thiswork may pave theway for developing promising yet imperfect electrode materials in the field of energy storage.展开更多
Sodium/potassium ion batteries(SIBs/PIBs)are attractive energy storage devices that offer greater sustainability and economic efficiency compared to their lithium-ion battery(LIB)counterparts.However,conventional elec...Sodium/potassium ion batteries(SIBs/PIBs)are attractive energy storage devices that offer greater sustainability and economic efficiency compared to their lithium-ion battery(LIB)counterparts.However,conventional electrode materials with satisfactory cycling stability and rate capacity are still lacking,due to intrinsic low electronic conductivity,sluggish intrinsic ion/electron kinetics and unsatisfactory structural stability.Herein,a well-designed two-step electrospinning/annealing strategy has been employed to fabricate defect-rich WS_(x)Se_(2-x)nanocrystals within selenized polyacrylonitrile fibers(designated as WSSe-Se@PAN).By tuning the Se-doping into the PAN fibers and forming defect-rich WS_(x)Se_(2-x)nanocrystals,the synergistic coupling of S-vacancy regulation can enhance the active sites,expand the interlayer spacing,and accelerate Na^(+)/K^(+)diffusion kinetics,simultaneously.The WSSe-Se@PAN electrode,serving as the anode,delivers a superior sodium storage performance(467 mA h g^(-1)at 2.0 A g^(-1)after 700 cycles),and shows a reversible discharge capacity of 299 mA h g^(-1)at 0.5 A g^(-1)after 60 cycles with 99.8%capacity retention for the sodium ion full batteries.Encouragingly,it displays excellent feasibility in a wide working temperature range between-15 and 50℃ for SIBs.Furthermore,it exhibits high-rate capability and robust cycling life(139 mA h g^(-1)at 1.0 A g^(-1)after 1000 cycles)for PIBs.This work demonstrates that defect engineering of metal chalcogenides by anion doping is a feasible strategy to achieve high-performance anode materials for alkali metal ion batteries.展开更多
基金supported by National Natural Science Foundation of China 22479026,22225902,51502036,21875037,and 2220918National Key Research and Development Program of China 2023YFC3906300Natural Science Foundation of Fujian Province 2023J02013,2023YZ038001,Self-Deployment Project Research Program of Haixi Institutes,Chinese Academy of Sciences,Young Top Talent of Fujian Young Eagle Program,Educational Commission of Fujian Province.
文摘Tin sulfide(SnS_(2))is a promising anodematerial for sodium/potassium-ion batteries(SIBs/PIBs)due to its large interlayer spacing and high theoretical capacity.However,its application is hindered by sluggish kinetics,volume expansion,and low conductivity.In this work,a synergistic engineering route is proposed that combining environmentally friendly chlorella with sulfurized polyacrylonitrile(SPAN)to achieve green doping and dual-mode confinement SnS_(2)-based anode.The SPANmatrix prevents SnS2 agglomeration,enhances charge transfer,and improves structural stability,while phosphorus(P)doping accelerates“solid‒solid”conversion kinetics.The SnS_(2)‒P‒SPAN anode demonstrates outstanding sodium/potassium storage performance across a wide temperature range(‒40◦C to 70◦C),delivering high reversible capacities,excellent rate capability,and exceptional long-term cycling stability.The reliability of the as-developed strategy in a SnS_(2)‒P‒SPAN//NaNi_(0.4)Fe_(0.2)Mn_(0.4)O_(2)full cell is also verified,which shows strong practical potential with high capacity and long durability(241 mAh g^(−1)/800 cycles/0.5 A g^(−1)/25℃;159 mAh g^(−1)/400 cycles/0.5 A g−1/60℃;105 mAh g^(−1)/800 cycles/0.5 A g^(−1)/‒15℃).The associated electrochemical mechanisms of SnS_(2)‒P‒SPAN are elucidated through comprehensive electrochemical tests,in/ex situ analyses.The theoretical calculation unveil that P-doping helps to enhance the adsorption capacity of the Na^(+)and discharge products.Thiswork may pave theway for developing promising yet imperfect electrode materials in the field of energy storage.
基金supported by the National Key Research and Development Program of China(2023YFC3906300 and 2019YFC1904500)National Natural Science Foundation of China(NSFC 51502036 and 21875037)+3 种基金the Young Top Talent of Fujian Young Eagle Program of Fujian Province,Educational Commission of Fujian Province(2022G02022)Key Project for Technology Innovation and Industrialization of Fujian Province(2023G002)Natural Science Foundation of Fuzhou City(2022-Y-004)Natural Science Foundation of Fujian Province(2023J02013 and 2023YZ038001).
文摘Sodium/potassium ion batteries(SIBs/PIBs)are attractive energy storage devices that offer greater sustainability and economic efficiency compared to their lithium-ion battery(LIB)counterparts.However,conventional electrode materials with satisfactory cycling stability and rate capacity are still lacking,due to intrinsic low electronic conductivity,sluggish intrinsic ion/electron kinetics and unsatisfactory structural stability.Herein,a well-designed two-step electrospinning/annealing strategy has been employed to fabricate defect-rich WS_(x)Se_(2-x)nanocrystals within selenized polyacrylonitrile fibers(designated as WSSe-Se@PAN).By tuning the Se-doping into the PAN fibers and forming defect-rich WS_(x)Se_(2-x)nanocrystals,the synergistic coupling of S-vacancy regulation can enhance the active sites,expand the interlayer spacing,and accelerate Na^(+)/K^(+)diffusion kinetics,simultaneously.The WSSe-Se@PAN electrode,serving as the anode,delivers a superior sodium storage performance(467 mA h g^(-1)at 2.0 A g^(-1)after 700 cycles),and shows a reversible discharge capacity of 299 mA h g^(-1)at 0.5 A g^(-1)after 60 cycles with 99.8%capacity retention for the sodium ion full batteries.Encouragingly,it displays excellent feasibility in a wide working temperature range between-15 and 50℃ for SIBs.Furthermore,it exhibits high-rate capability and robust cycling life(139 mA h g^(-1)at 1.0 A g^(-1)after 1000 cycles)for PIBs.This work demonstrates that defect engineering of metal chalcogenides by anion doping is a feasible strategy to achieve high-performance anode materials for alkali metal ion batteries.
