The limited lithium resource in earth's crust has stimulated the pursuit of alternative energy storage technologies to lithium-ion battery.Potassium-ion batteries(KIBs)are regarded as a kind of promising candidate...The limited lithium resource in earth's crust has stimulated the pursuit of alternative energy storage technologies to lithium-ion battery.Potassium-ion batteries(KIBs)are regarded as a kind of promising candidate for large-scale energy storage owing to the high abundance and low cost of potassium resources.Nevertheless,further development and wide application of KIBs are still challenged by several obstacles,one of which is their fast capacity deterioration at high rates.A considerable amount of effort has recently been devoted to address this problem by developing advanced carbonaceous anode materials with diverse structures and morphologies.This review presents and highlights how the architecture engineering of carbonaceous anode materials gives rise to high-rate performances for KIBs,and also the beneficial conceptions are consciously extracted from the recent progress.Particularly,basic insights into the recent engineering strategies,structural innovation,and the related advances of carbonaceous anodes for high-rate KIBs are under specific concerns.Based on the achievements attained so far,a perspective on the foregoing,and proposed possible directions,and avenues for designing high-rate anodes,are presented finally.展开更多
Potassium-based energy storage devices(PEDS)are considered as hopeful candidates for energy storage applications because of the abundant potassium resources in nature and high mobility in the electrolyte.although carb...Potassium-based energy storage devices(PEDS)are considered as hopeful candidates for energy storage applications because of the abundant potassium resources in nature and high mobility in the electrolyte.although carbon materials show great potential for potassium-ion storage,poor rate performance,and unsatisfactory cycle lifespan in existing carbon-based PIBs anode,it also cannot match the dynamics and stability of the capacitor cathode.Nitrogen doping has been proven to be a effective modification strategy to improve the electrochemical performance of carbon materials.Hence,we prepare carbon nanofibers and g-C_(3)N_(4)composites with high nitrogen contents(19.78 at%);moreover,the sum of pyrrolic N and pyridinic N is up to 59.51%.It achieves high discharge capacity(391 m Ah g^(-1)at0.05 A g^(-1)),rate capacity(141 m Ah g^(-1)at 2 A g^(-1)),and long cycling performance(201 m Ah g^(-1)at 1 A g^(-1)over 3000 cycles)when as an anode for PIBs.Furthermore,it can deliver promising discharge capacity of132 m Ah g^(-1)at 0℃.Moreover,as battery anode for potassium-ion hybrid capacitors(PIHC)device with an active carbon cathode,it delivers energy/power density(62 and 2102 W kg^(-1))as well as high reversible capacity(106 m Ah g^(-1)at 1 A g^(-1)).展开更多
Metal coordination compounds(MCCs)are gaining popularity for potassium-ion batteries(PIBs)owing to their tuneable structure,multiple reaction sites,low cost and unique morphology.However,they are generally subjected t...Metal coordination compounds(MCCs)are gaining popularity for potassium-ion batteries(PIBs)owing to their tuneable structure,multiple reaction sites,low cost and unique morphology.However,they are generally subjected to intrinsic features of the sluggish ionic diffusion coefficient,low electronic conductivity and slow kinetics.Herein,a new MCC material of cobalt-1,3,5-trioxy-2,4,6-triamino-benzo(Co-TB)coordination compound was synthesized and homogenously grown on the surface of graphene nanosheets(GNS),forming a Co-TB@GNS composite with enhanced electronic conductivity and flexible capability.Benefiting from the overall enhanced conductivity,high surface area and abundant activated K-storage sites,Co-TB@GNS electrodes have exhibited superior cycling performance with high reversible capacities(312 mAh·g^(-1)after 100 cycles at 100 mA·g^(-1),224 mAh·g^(-1)after 500 cycles at 1 A·g^(-1))and better rate performances compared with the pure Co-TB compound when served as PIB's anodes.Furthermore,multiple in-situ measurement techniques have jointly confirmed that the organic functional groups(C=O,C=N and C=C of benzene rings)and Co^(2+)in Co-TB are the main reversible K-storage sites,including in-situ Fourier transform infrared spectroscopy(FTIR)and X-ray diffraction(XRD),and partial capacity contribution is originated from GNS by the apparent K-storage behavior in the in-situ XRD pattern,proving the possibility of K-storage for metal-organic materials.展开更多
过渡金属二硫族化合物(TMDs)用作钾离子电池(KIBs)负极时存在反应动力学缓慢及结构稳定性不足等难题,导致其循环和倍率性能差,使得其应用严重受限.在本文中,我们将Te掺杂的1T′-ReSe_(2)负载在MXene上构建了高性能KIBs负极(Te-ReSe_(2)/...过渡金属二硫族化合物(TMDs)用作钾离子电池(KIBs)负极时存在反应动力学缓慢及结构稳定性不足等难题,导致其循环和倍率性能差,使得其应用严重受限.在本文中,我们将Te掺杂的1T′-ReSe_(2)负载在MXene上构建了高性能KIBs负极(Te-ReSe_(2)/MXene).该超结构利用缺陷化的Te-ReSe_(2)与自调节弹性MXene的协同效应,表现出高可逆容量(0.1 A g^(−1)电流密度下循环200圈后为361.1 mA h g^(−1)),优异的倍率性能(20 A g^(−1)电流密度下为179.3 mA h g^(−1))和超长的循环寿命(5 A g^(−1)电流密度下循环2000圈后为202.8 mA h g^(−1)),并能实现柔性全电池的稳定运行,是目前所有TMDs基负极展示的最好性能之一.动力学分析和理论计算表明,该材料具有出色的赝电容特性,高电导率和优异的K^(+)吸附/扩散能力,显著提升了其反应动力学.展开更多
基金National Natural Science Foundation of China,Grant/Award Numbers:51972121,51972270,51702262Tip-top Scientific and Technical Innovative Youth Talents of Guangdong Special Support Program,Grant/Award Number:2017TQ04C419Key Research and Development Program of Shaanxi Province,Grant/Award Number:2019TSLGY07-03。
文摘The limited lithium resource in earth's crust has stimulated the pursuit of alternative energy storage technologies to lithium-ion battery.Potassium-ion batteries(KIBs)are regarded as a kind of promising candidate for large-scale energy storage owing to the high abundance and low cost of potassium resources.Nevertheless,further development and wide application of KIBs are still challenged by several obstacles,one of which is their fast capacity deterioration at high rates.A considerable amount of effort has recently been devoted to address this problem by developing advanced carbonaceous anode materials with diverse structures and morphologies.This review presents and highlights how the architecture engineering of carbonaceous anode materials gives rise to high-rate performances for KIBs,and also the beneficial conceptions are consciously extracted from the recent progress.Particularly,basic insights into the recent engineering strategies,structural innovation,and the related advances of carbonaceous anodes for high-rate KIBs are under specific concerns.Based on the achievements attained so far,a perspective on the foregoing,and proposed possible directions,and avenues for designing high-rate anodes,are presented finally.
基金supported by the National Natural Science Foundation of China(Grants 51772082,51574117,and 51804106)the Research Projects of Degree and Graduate Education Teaching Reformation in Hunan Province(JG2018B031)+2 种基金the Natural Science Foundation of Hunan Province(2019JJ30002,2019JJ50061)the Guangdong Basic and Applied Basic Research Foundation(No.2019B151502045)the National Natural Science Foundation of China(Nos.51802361,51972351)
文摘Potassium-based energy storage devices(PEDS)are considered as hopeful candidates for energy storage applications because of the abundant potassium resources in nature and high mobility in the electrolyte.although carbon materials show great potential for potassium-ion storage,poor rate performance,and unsatisfactory cycle lifespan in existing carbon-based PIBs anode,it also cannot match the dynamics and stability of the capacitor cathode.Nitrogen doping has been proven to be a effective modification strategy to improve the electrochemical performance of carbon materials.Hence,we prepare carbon nanofibers and g-C_(3)N_(4)composites with high nitrogen contents(19.78 at%);moreover,the sum of pyrrolic N and pyridinic N is up to 59.51%.It achieves high discharge capacity(391 m Ah g^(-1)at0.05 A g^(-1)),rate capacity(141 m Ah g^(-1)at 2 A g^(-1)),and long cycling performance(201 m Ah g^(-1)at 1 A g^(-1)over 3000 cycles)when as an anode for PIBs.Furthermore,it can deliver promising discharge capacity of132 m Ah g^(-1)at 0℃.Moreover,as battery anode for potassium-ion hybrid capacitors(PIHC)device with an active carbon cathode,it delivers energy/power density(62 and 2102 W kg^(-1))as well as high reversible capacity(106 m Ah g^(-1)at 1 A g^(-1)).
基金financially supported by the National Natural Science Foundation of China(Nos.21975154 and 22179078)Shanghai Municipal Education Commission(Innovation Program:2019-01-07-00-09-E00021)the Innovative Research Team of High-level Local Universities in Shanghai。
文摘Metal coordination compounds(MCCs)are gaining popularity for potassium-ion batteries(PIBs)owing to their tuneable structure,multiple reaction sites,low cost and unique morphology.However,they are generally subjected to intrinsic features of the sluggish ionic diffusion coefficient,low electronic conductivity and slow kinetics.Herein,a new MCC material of cobalt-1,3,5-trioxy-2,4,6-triamino-benzo(Co-TB)coordination compound was synthesized and homogenously grown on the surface of graphene nanosheets(GNS),forming a Co-TB@GNS composite with enhanced electronic conductivity and flexible capability.Benefiting from the overall enhanced conductivity,high surface area and abundant activated K-storage sites,Co-TB@GNS electrodes have exhibited superior cycling performance with high reversible capacities(312 mAh·g^(-1)after 100 cycles at 100 mA·g^(-1),224 mAh·g^(-1)after 500 cycles at 1 A·g^(-1))and better rate performances compared with the pure Co-TB compound when served as PIB's anodes.Furthermore,multiple in-situ measurement techniques have jointly confirmed that the organic functional groups(C=O,C=N and C=C of benzene rings)and Co^(2+)in Co-TB are the main reversible K-storage sites,including in-situ Fourier transform infrared spectroscopy(FTIR)and X-ray diffraction(XRD),and partial capacity contribution is originated from GNS by the apparent K-storage behavior in the in-situ XRD pattern,proving the possibility of K-storage for metal-organic materials.
基金the National Natural Science Foundation of China(22005223 and 21975187)Guangdong Basic and Applied Basic Research Foundation(2019A1515012161)+7 种基金the Special Innovational Project of Department of Education of Guangdong Province(2019KTSCX186 and 2017KCXTD031)the Science Foundation for Young Teachers of Wuyi University(2019td01)the Science Foundation for High-Level Talents of Wuyi University(2018RC50 and 2017RC23)Wuyi University-Hong Kong-Macao Joint Research Project(2019WGALH10)the Innovative Leading Talents of Jiangmen(Jiangren(2019)7)the Science and Technology Projects of Jiangmen((2017)307,(2017)149,(2018)352)the Research Fund of the State Key Laboratory of Solidification Processing(NPU),China(SKLSP202004)Guangdong Key Building Discipline Research Capability Enhancement Funds(2021ZDJS093).
文摘过渡金属二硫族化合物(TMDs)用作钾离子电池(KIBs)负极时存在反应动力学缓慢及结构稳定性不足等难题,导致其循环和倍率性能差,使得其应用严重受限.在本文中,我们将Te掺杂的1T′-ReSe_(2)负载在MXene上构建了高性能KIBs负极(Te-ReSe_(2)/MXene).该超结构利用缺陷化的Te-ReSe_(2)与自调节弹性MXene的协同效应,表现出高可逆容量(0.1 A g^(−1)电流密度下循环200圈后为361.1 mA h g^(−1)),优异的倍率性能(20 A g^(−1)电流密度下为179.3 mA h g^(−1))和超长的循环寿命(5 A g^(−1)电流密度下循环2000圈后为202.8 mA h g^(−1)),并能实现柔性全电池的稳定运行,是目前所有TMDs基负极展示的最好性能之一.动力学分析和理论计算表明,该材料具有出色的赝电容特性,高电导率和优异的K^(+)吸附/扩散能力,显著提升了其反应动力学.
