Lithium-ion battery(LIB) industry seems to have met its bottle neck in cutting down producing costs even though much efforts have been put into building a complete industrial chain. Actually, manufacturing methods can...Lithium-ion battery(LIB) industry seems to have met its bottle neck in cutting down producing costs even though much efforts have been put into building a complete industrial chain. Actually, manufacturing methods can greatly affect the cost of battery production. Up to now, lithium ion battery producers still adopt manufacturing methods with cumbersome sub-components preparing processes and costly assembling procedures, which will undoubtedly elevate the producing cost. Herein, we propose a novel approach to directly assemble battery components(cathode, anode and separator) in an integrated way using electro-spraying and electro-spinning technologies. More importantly, this novel battery manufacturing method can produce LIBs in large scale, and the products show excellent mechanical strength, flexibility, thermal stability and electrolyte wettability. Additionally, the performance of the as-prepaed Li Fe PO_(4)||graphite full cell produced by this new method is comparable or even better than that produced by conventional manufacturing approach. In brief, this work provides a new promising technology to prepare LIBs with low cost and better performance.展开更多
Owing to the environmental and inherent advantages,nitrogen reduction reaction(NRR)by electrocatalysts attracts global attention.The surface engineering is widely employed to enhance the electrocatalytic activity by a...Owing to the environmental and inherent advantages,nitrogen reduction reaction(NRR)by electrocatalysts attracts global attention.The surface engineering is widely employed to enhance the electrocatalytic activity by atomic defects and heterostructure effects.A three-dimensional(3D)free-standing integrated electrode was fabricated by numerous nearly-single-crystal TiO_(2-δ)N_δnanowire arrays.Based on the high electronic conductivity network,it exposes numerous active sites as well to facilitate the selective nitrogen adsorption and*H adsorption suppression.The synergistic effects between Ti^(3+)and oxygen vacancy(O_v)boost the intrinsic catalytic activity,in which Ti^(3+)acquired electrons via Ovcan effectively activate the N≡N bond and make it easy to bind with protons.The energy barrier of primary protonation process(*N_(2)+H^(+)+e^(-)→*NNH)can be dramatically decreased.The highest ammonia yield rate(14.33μg h^(-1)mgcat^(-1))emerges at-0.2 V,while the optimal ammonia Faradaic efficiency(9.17%)is acquired at-0.1 V.Density functional theory(DFT)calculation reveals that the Ti^(3+)can be served as the active sites for nitrogen adsorption and activation,while ammonia synthesis is accomplished by the distal pathway.The high electronic conductivity integrated network and synergistic effects can significantly facilitate nitrogen absorption and accelerate electrocatalytic reaction kinetic,which are responsible for the excellent NRR performance at room temperature.展开更多
开发环保、低成本的新型正极材料对钾离子电池的发展具有重要意义.高达4.0V的工作电压,使得氟磷酸钒钾(KVPO4F)成为一种极具吸引力的钾电正极材料.然而,KVPO4F材料低的电子导电性(1.84×10^-5 S m^-1)和不稳定的电极/电解质界面,导...开发环保、低成本的新型正极材料对钾离子电池的发展具有重要意义.高达4.0V的工作电压,使得氟磷酸钒钾(KVPO4F)成为一种极具吸引力的钾电正极材料.然而,KVPO4F材料低的电子导电性(1.84×10^-5 S m^-1)和不稳定的电极/电解质界面,导致其较差的循环稳定性.本文设计并制备由无定型热解碳层及三维导电碳网络对KVPO4F颗粒进行三维包覆,得到KVPF@3DC复合正极并展现出优异的电化学性能.在20,50和500 mA g^-1电流速率下,其放电比容量分别为102.96、96.01和60.02 mAh g^-1;在500 mA g^-1条件下循环550次后,循环保持率高达83.6%.复合材料中,热解碳层均匀包覆在KVPO4F不规则纳米颗粒表面,而三维导电网络则成功连接不同的KVPO4F颗粒,这种特殊结构充分改善了KVPF@3DC复合材料的电子传导能力,同时提高了循环过程中电极材料的界面稳定性,为超稳定高电压钾离子电池正极的开发提供了思路.展开更多
基金This work was financially supported by the National Nat-ural Science Foundation of China No.U20A20247 and 51922038.
文摘Lithium-ion battery(LIB) industry seems to have met its bottle neck in cutting down producing costs even though much efforts have been put into building a complete industrial chain. Actually, manufacturing methods can greatly affect the cost of battery production. Up to now, lithium ion battery producers still adopt manufacturing methods with cumbersome sub-components preparing processes and costly assembling procedures, which will undoubtedly elevate the producing cost. Herein, we propose a novel approach to directly assemble battery components(cathode, anode and separator) in an integrated way using electro-spraying and electro-spinning technologies. More importantly, this novel battery manufacturing method can produce LIBs in large scale, and the products show excellent mechanical strength, flexibility, thermal stability and electrolyte wettability. Additionally, the performance of the as-prepaed Li Fe PO_(4)||graphite full cell produced by this new method is comparable or even better than that produced by conventional manufacturing approach. In brief, this work provides a new promising technology to prepare LIBs with low cost and better performance.
基金financially supported by the Liao Ning Revitalization Talents Program(XLYC2007155)the Fundamental Research Funds for the Central Universities(N2025018,N2025009)。
文摘Owing to the environmental and inherent advantages,nitrogen reduction reaction(NRR)by electrocatalysts attracts global attention.The surface engineering is widely employed to enhance the electrocatalytic activity by atomic defects and heterostructure effects.A three-dimensional(3D)free-standing integrated electrode was fabricated by numerous nearly-single-crystal TiO_(2-δ)N_δnanowire arrays.Based on the high electronic conductivity network,it exposes numerous active sites as well to facilitate the selective nitrogen adsorption and*H adsorption suppression.The synergistic effects between Ti^(3+)and oxygen vacancy(O_v)boost the intrinsic catalytic activity,in which Ti^(3+)acquired electrons via Ovcan effectively activate the N≡N bond and make it easy to bind with protons.The energy barrier of primary protonation process(*N_(2)+H^(+)+e^(-)→*NNH)can be dramatically decreased.The highest ammonia yield rate(14.33μg h^(-1)mgcat^(-1))emerges at-0.2 V,while the optimal ammonia Faradaic efficiency(9.17%)is acquired at-0.1 V.Density functional theory(DFT)calculation reveals that the Ti^(3+)can be served as the active sites for nitrogen adsorption and activation,while ammonia synthesis is accomplished by the distal pathway.The high electronic conductivity integrated network and synergistic effects can significantly facilitate nitrogen absorption and accelerate electrocatalytic reaction kinetic,which are responsible for the excellent NRR performance at room temperature.
基金financially supported by the National Natural Science Foundation of China(51672078 and 21473052)Hunan University State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Independent Research Project(71675004)Hunan Youth Talents(2016RS3025)。
文摘开发环保、低成本的新型正极材料对钾离子电池的发展具有重要意义.高达4.0V的工作电压,使得氟磷酸钒钾(KVPO4F)成为一种极具吸引力的钾电正极材料.然而,KVPO4F材料低的电子导电性(1.84×10^-5 S m^-1)和不稳定的电极/电解质界面,导致其较差的循环稳定性.本文设计并制备由无定型热解碳层及三维导电碳网络对KVPO4F颗粒进行三维包覆,得到KVPF@3DC复合正极并展现出优异的电化学性能.在20,50和500 mA g^-1电流速率下,其放电比容量分别为102.96、96.01和60.02 mAh g^-1;在500 mA g^-1条件下循环550次后,循环保持率高达83.6%.复合材料中,热解碳层均匀包覆在KVPO4F不规则纳米颗粒表面,而三维导电网络则成功连接不同的KVPO4F颗粒,这种特殊结构充分改善了KVPF@3DC复合材料的电子传导能力,同时提高了循环过程中电极材料的界面稳定性,为超稳定高电压钾离子电池正极的开发提供了思路.
