Antimony-based anodes have attracted wide attention in potassium-ion batteries due to their high theoretical specific capacities(∼660 mA h g^(-1))and suitable voltage platforms.However,severe capacity fading caused b...Antimony-based anodes have attracted wide attention in potassium-ion batteries due to their high theoretical specific capacities(∼660 mA h g^(-1))and suitable voltage platforms.However,severe capacity fading caused by huge volume change and limited ion transportation hinders their practical applications.Recently,strategies for controlling the morphologies of Sb-based materials to improve the electrochemical performances have been proposed.Among these,the two-dimensional Sb(2D-Sb)materials present excellent properties due to shorted ion immigration paths and enhanced ion diffusion.Nevertheless,the synthetic methods are usually tedious,and even the mechanism of these strategies remains elusive,especially how to obtain large-scale 2D-Sb materials.Herein,a novel strategy to synthesize 2D-Sb material using a straightforward solvothermal method without the requirement of a complex nanostructure design is provided.This method leverages the selective adsorption of aldehyde groups in furfural to induce crystal growth,while concurrently reducing and coating a nitrogen-doped carbon layer.Compared to the reported methods,it is simpler,more efficient,and conducive to the production of composite nanosheets with uniform thickness(3–4 nm).The 2D-Sb@NC nanosheet anode delivers an extremely high capacity of 504.5 mA h g^(-1) at current densities of 100 mA g^(-1) and remains stable for more than 200 cycles.Through characterizations and molecular dynamic simulations,how potassium storage kinetics between 2D Sb-based materials and bulk Sb-based materials are explored,and detailed explanations are provided.These findings offer novel insights into the development of durable 2D alloy-based anodes for next-generation potassium-ion batteries.展开更多
Constructing an optimal solid-electrolyte interphase(SEI)through electrolyte strategies is an effective approach to suppress lithium dendrites and improve deposition/stripping reversibility.Specifically,increasing the...Constructing an optimal solid-electrolyte interphase(SEI)through electrolyte strategies is an effective approach to suppress lithium dendrites and improve deposition/stripping reversibility.Specifically,increasing the proportion of anion coordination in the inner Liþsolvation sheath promotes the formation of an anion-derived SEI that features a high content of inorganic components favoring Liþdiffusion.However,whether this anion-rich structure can persist during cycling has not been dynamically investigated.In this work,we not only construct a favorable solvation structure but also study its evolution in both bulk and interface regions across varying temperatures.Additionally,we employ the unique“adsorption-attraction”mechanism of trifluoromethoxybenzene(PhOCF_(3))solvent to inhibit the undesirable transition from an“anion-rich”to“anion-deficient”structure at the anode interface,which is confirmed by 2D NMR and in situ infrared spectroscopy.In summary,this work explores the solvation structure in depth and proposes new perspectives on designing electrolytes for lithium metal batteries.展开更多
基金financially supported by the Science and Technology Development Program of Jilin Province(YDZJ202101ZYTS185)the National Natural Science Foundation of China(21975250)。
文摘Antimony-based anodes have attracted wide attention in potassium-ion batteries due to their high theoretical specific capacities(∼660 mA h g^(-1))and suitable voltage platforms.However,severe capacity fading caused by huge volume change and limited ion transportation hinders their practical applications.Recently,strategies for controlling the morphologies of Sb-based materials to improve the electrochemical performances have been proposed.Among these,the two-dimensional Sb(2D-Sb)materials present excellent properties due to shorted ion immigration paths and enhanced ion diffusion.Nevertheless,the synthetic methods are usually tedious,and even the mechanism of these strategies remains elusive,especially how to obtain large-scale 2D-Sb materials.Herein,a novel strategy to synthesize 2D-Sb material using a straightforward solvothermal method without the requirement of a complex nanostructure design is provided.This method leverages the selective adsorption of aldehyde groups in furfural to induce crystal growth,while concurrently reducing and coating a nitrogen-doped carbon layer.Compared to the reported methods,it is simpler,more efficient,and conducive to the production of composite nanosheets with uniform thickness(3–4 nm).The 2D-Sb@NC nanosheet anode delivers an extremely high capacity of 504.5 mA h g^(-1) at current densities of 100 mA g^(-1) and remains stable for more than 200 cycles.Through characterizations and molecular dynamic simulations,how potassium storage kinetics between 2D Sb-based materials and bulk Sb-based materials are explored,and detailed explanations are provided.These findings offer novel insights into the development of durable 2D alloy-based anodes for next-generation potassium-ion batteries.
基金support from the National Key Research and Development Program of China(2021YFB2400300)the National Natural Science Foundation of China(21875198,21875195)+1 种基金the Fundamental Research Funds for the Central Universities(20720190040)the Key Project of Science and Technology of Xiamen(3502Z20201013).
文摘Constructing an optimal solid-electrolyte interphase(SEI)through electrolyte strategies is an effective approach to suppress lithium dendrites and improve deposition/stripping reversibility.Specifically,increasing the proportion of anion coordination in the inner Liþsolvation sheath promotes the formation of an anion-derived SEI that features a high content of inorganic components favoring Liþdiffusion.However,whether this anion-rich structure can persist during cycling has not been dynamically investigated.In this work,we not only construct a favorable solvation structure but also study its evolution in both bulk and interface regions across varying temperatures.Additionally,we employ the unique“adsorption-attraction”mechanism of trifluoromethoxybenzene(PhOCF_(3))solvent to inhibit the undesirable transition from an“anion-rich”to“anion-deficient”structure at the anode interface,which is confirmed by 2D NMR and in situ infrared spectroscopy.In summary,this work explores the solvation structure in depth and proposes new perspectives on designing electrolytes for lithium metal batteries.
