Lithium ion power batteries have undoubtedly become one of the most promising rechargeable batteries at present;nonetheless,they still suffer from the challenges such as requirement of even higher energy density and c...Lithium ion power batteries have undoubtedly become one of the most promising rechargeable batteries at present;nonetheless,they still suffer from the challenges such as requirement of even higher energy density and capacity retention.Nickel-rich layer oxides(Ni≥0.8)become ideal cathode materials to achieve the high specific capacity.Integration of optimization of synthesis process and modification of crystal structure to suppress the capacity fading can obviously improve the performance of the lithium ion batteries.This review presents the recent modification strategies of the nickel-rich layered oxide materials.Unlike in previous reviews and related papers,the specific mechanism about each type of the modification strategies is specially discussed in detail,which is mainly about inhibiting the anisotropic lattice strain and adjusting the cation mixing degree to maintain crystal structure.Based on the recent progress,the prospects and challenges of the modified nickel-rich layer cathodes to upgrade the property of lithium ion batteries are also comprehensively analyzed,and the potential applications in the field of plug-in hybrid vehicles and electric vehicles are further discussed.展开更多
The emergence of inverted perovskite solar cells(PSCs) has attached great attention derived from the potential in improving stability. Charge transporting layer, especially hole transporting layer is crucial for effic...The emergence of inverted perovskite solar cells(PSCs) has attached great attention derived from the potential in improving stability. Charge transporting layer, especially hole transporting layer is crucial for efficient inverted PSCs. Organic materials were used as hole transporting layer previously. Recently, more and more inorganic hole transporting materials have been deployed for further improving the device stability. Nickel oxide(NiOx) as p-type metal oxide, owning high charge mobility and intrinsic stability,has been widely adopted in inverted PSCs. High performance over 20% efficiency has been achieved on NiOx base inverted PSCs. Herein, we have summarized recent progresses and strategies on the NiOx based PSCs, including the synthesis or deposition methods of NiOx, doping and surface modification of NiOx for efficient and stable PSCs. Finally, we will discuss current challenges of utilizing NiOx HTLs in PSCs and attempt to give probable solutions to make further development in efficient as well as stable NiOx based PSCs.展开更多
Electrocatalytic chemical oxidation(ECO)is an energy-efficient anodic reaction alternative to the oxygen evolution reaction(OER).ECO lowers the reaction potential and yields higher-value fine chemicals at the anode.Th...Electrocatalytic chemical oxidation(ECO)is an energy-efficient anodic reaction alternative to the oxygen evolution reaction(OER).ECO lowers the reaction potential and yields higher-value fine chemicals at the anode.The catalyst material plays a crucial role in influencing and determining ECO performance.Enhancing catalyst performance encompasses aspects such as activity,stability,selectivity and cost.Nickelbased electrocatalysts have garnered significant attention for their exceptional performance and widespread use in ECO applications.By modifying nickel-based electrocatalysts,the formation of NiOOH active centers can be encouraged.Strategies such as adjusting size and morphology,doping,introducing defects and constructing heterojunctions are advantageous for enhancing performance.Given the rapid advancements in related research fields,it is imperative to comprehend the mechanisms of nickel-based electrocatalysts in ECO and develop innovative catalysts.This article provides an overview of the modification strategies of nickel-based electrocatalysts,as well as their applications and mechanisms in ECO.展开更多
High-voltage medium-nickel low-cobalt lithium layered oxide cathode materials are becoming a popular development route for high-energy lithium-ion batteries due to their relatively high capacity,low cost,and improved ...High-voltage medium-nickel low-cobalt lithium layered oxide cathode materials are becoming a popular development route for high-energy lithium-ion batteries due to their relatively high capacity,low cost,and improved safety.Unfortunately,capacity fading derived from surface lithium residue,electrode-electrolyte interfacial side reactions,and bulk structure degradation severely limits large-scale commercial utilization.In this work,an ultrathin and uniform NASICON-type Li_(3)V_(2)(PO_(4))_(3)(LVP)nanoscale functional coating is formed in situ by utilizing residual lithium to enhance the lithium storage performance of LiNi_(0.6)Co0.05Mn_(0.35)O_(2)(NCM)cathode.The GITT and ex-situ EIS and XPS demonstrate exceptional Li+diffusion and conductivity and attenuated interfacial side reactions,improving the electrode-electrolyte interface stability.The variable temperature in-situ XRD demonstrates delayed phase transition temperature to improve thermal stability.The battery in-situ XRD displays the singlephase H1-H2 reaction and weakened harmful H3 phase transition,minimizing the bulk mechanical degradation.These improvements are attributed to the removal of surface residual lithium and the formation of NASICON-type Li_(3)V_(2)(PO_(4))_(3)functional coatings with stable structure and high ionic and electronic conductivity.Consequently,the obtained NCM@LVP delivers a higher capacity retention rate(97.1%vs.79.6%)after 150 cycles and a superior rate capacity(87 mAh·g^(-1)vs.58 mAh·g^(-1))at a 5 C current density than the pristine NCM under a high cut-off voltage of 4.5 V.This work suggests a clever way to utilize residual lithium to form functional coatings in situ to improve the lithium storage performance of high-voltage medium-nickel low-cobalt cathode materials.展开更多
Economical water electrolysis requires highly active non-noble electrocatalysts to overcome the sluggish kinetics of the two half-cell reactions,oxygen evolution reaction,and hydrogen evolution reaction.Although inten...Economical water electrolysis requires highly active non-noble electrocatalysts to overcome the sluggish kinetics of the two half-cell reactions,oxygen evolution reaction,and hydrogen evolution reaction.Although intensive efforts have been committed to achieve a hydrogen economy,the expensive noble metal-based catalysts remain under consideration.Therefore,the engineering of self-supported electrocatalysts prepared using a direct growth strategy on three-dimensional(3D)nickel foam(NF)as a conductive substrate has garnered significant interest.This is due to the large active surface area and 3D porous network offered by these electrocatalysts,which can enhance the synergistic eff ect between the catalyst and the substrate,as well as improve electrocatalytic performance.Hydrothermal-assisted growth,microwave heating,electrodeposition,and other physical methods(i.e.,chemical vapor deposition and plasma treatment)have been applied to NF to fabricate competitive electrocatalysts with low overpotential and high stability.In this review,recent advancements in the development of self-supported electrocatalysts on 3D NF are described.Finally,we provide future perspectives of self-supported electrode platforms in electrochemical water splitting.展开更多
In this work,we synthesized LaFeO_3–xwt%Ni(x=0,5,10,15)composites via a solid-state reaction method by adding Ni to the reactants,La_2O_3 and Fe_2O_3.Field-emission scanning electron microscopy(FE-SEM)and energy-disp...In this work,we synthesized LaFeO_3–xwt%Ni(x=0,5,10,15)composites via a solid-state reaction method by adding Ni to the reactants,La_2O_3 and Fe_2O_3.Field-emission scanning electron microscopy(FE-SEM)and energy-dispersive X-ray spectroscopy(EDS)results revealed that Ni powders evenly dispersed among the LaFeO_3 particles and apparently reduced their aggregation,which imparted the composites with a loose structure.Moreover,the Ni formed a conductive network,thus improving the conductivity of the composites.The maximum discharge capacity of the LaFeO_3 electrodes remarkably increased from 266.8 mAh·g^(–1)(x=0)to 339.7 mAh·g^(–1)(x=10).In particular,the high-rate dischargeability of the LaFeO_3–10wt%Ni electrode at a discharge current density of 1500 mA·g^(-1) reached 54.6%,which was approximately 1.5 times higher than that of the pure LaFeO_3.Such a Ni-modified loose structure not only increased the charge transfer rate on the surface of the LaFeO_3 particles but also enhanced the hydrogen diffusion rate in the bulk LaFeO_3.展开更多
To meet the range requirements of electric vehicles,the lithium nickel-rich manganese cobalt oxides(nickel-rich LiNi_(x)Mn_(y)Co_(1-x-y)O_(2);x≥0.5 or NMC)material is a promising contender due to its superior energy ...To meet the range requirements of electric vehicles,the lithium nickel-rich manganese cobalt oxides(nickel-rich LiNi_(x)Mn_(y)Co_(1-x-y)O_(2);x≥0.5 or NMC)material is a promising contender due to its superior energy and power density.Commercial polycrystalline nickel-rich NMC(PC-NMC)materials typically exhibit layered structures in which primary particles aggregate to form secondary particles to increase the contact area density.Thereby increasing the cathode energy density.However,PC-NMC materials present a number of challenges in terms of cycle life and thermal stability,many of which stem from their extensive surface area,including severe surface phase transitions,intergranular microcracks,oxygen evolution,and transition metal dissolution.To address these challenges,single-crystal NMC(SCNMC)materials were introduced,which exhibited higher capacity retention and thermal robustness owing to their unique structures,characterized by lower active surface area and heightened mechanical strength.Nevertheless,SC-NMC materials also had their own problems,including sluggish Li+bulk diffusion kinetics and nonuniform distribution of lattice strain,as well as their complex high-temperature calcination process.This review concentrates on discussing the merits and demerits of SC-NMC over PC-NMC materials and introduces the current research efforts aimed at improving the electrochemical performance of SC-NMC.展开更多
基金financially supported by the Beijing Natural Science Foundation(Grant No.L182022)the NSAF(Grant No.U1930113)+1 种基金the National Natural Science Foundation of China(52072036)the Guangdong Key Laboratory of Battery Safety(2019B121203008),China。
文摘Lithium ion power batteries have undoubtedly become one of the most promising rechargeable batteries at present;nonetheless,they still suffer from the challenges such as requirement of even higher energy density and capacity retention.Nickel-rich layer oxides(Ni≥0.8)become ideal cathode materials to achieve the high specific capacity.Integration of optimization of synthesis process and modification of crystal structure to suppress the capacity fading can obviously improve the performance of the lithium ion batteries.This review presents the recent modification strategies of the nickel-rich layered oxide materials.Unlike in previous reviews and related papers,the specific mechanism about each type of the modification strategies is specially discussed in detail,which is mainly about inhibiting the anisotropic lattice strain and adjusting the cation mixing degree to maintain crystal structure.Based on the recent progress,the prospects and challenges of the modified nickel-rich layer cathodes to upgrade the property of lithium ion batteries are also comprehensively analyzed,and the potential applications in the field of plug-in hybrid vehicles and electric vehicles are further discussed.
基金supported by the National Natural Science Foundation of China (Grant numbers: 61925405 and 51972102)。
文摘The emergence of inverted perovskite solar cells(PSCs) has attached great attention derived from the potential in improving stability. Charge transporting layer, especially hole transporting layer is crucial for efficient inverted PSCs. Organic materials were used as hole transporting layer previously. Recently, more and more inorganic hole transporting materials have been deployed for further improving the device stability. Nickel oxide(NiOx) as p-type metal oxide, owning high charge mobility and intrinsic stability,has been widely adopted in inverted PSCs. High performance over 20% efficiency has been achieved on NiOx base inverted PSCs. Herein, we have summarized recent progresses and strategies on the NiOx based PSCs, including the synthesis or deposition methods of NiOx, doping and surface modification of NiOx for efficient and stable PSCs. Finally, we will discuss current challenges of utilizing NiOx HTLs in PSCs and attempt to give probable solutions to make further development in efficient as well as stable NiOx based PSCs.
基金supported by the National Natural Science Foundation of China(Nos.52072152 and 51802126)the Jiangsu University Jinshan Professor Fund,the Jiangsu Specially-Appointed Professor Fund,Open Fund from Guangxi Key Laboratory of Electrochemical Energy Materials,Zhenjiang“Jinshan Talents”Project 2021,China PostDoctoral Science Foundation(No.2022M721372)+2 种基金“Doctor of Entrepreneurship and Innovation”in Jiangsu Province(No.JSSCBS20221197)the Postgraduate Research&Practice Innovation Program of Jiangsu Province(Nos.KYCX22_3645 and KYCX24_3964)Student Research Project of Jiangsu University(No.23A586).
文摘Electrocatalytic chemical oxidation(ECO)is an energy-efficient anodic reaction alternative to the oxygen evolution reaction(OER).ECO lowers the reaction potential and yields higher-value fine chemicals at the anode.The catalyst material plays a crucial role in influencing and determining ECO performance.Enhancing catalyst performance encompasses aspects such as activity,stability,selectivity and cost.Nickelbased electrocatalysts have garnered significant attention for their exceptional performance and widespread use in ECO applications.By modifying nickel-based electrocatalysts,the formation of NiOOH active centers can be encouraged.Strategies such as adjusting size and morphology,doping,introducing defects and constructing heterojunctions are advantageous for enhancing performance.Given the rapid advancements in related research fields,it is imperative to comprehend the mechanisms of nickel-based electrocatalysts in ECO and develop innovative catalysts.This article provides an overview of the modification strategies of nickel-based electrocatalysts,as well as their applications and mechanisms in ECO.
基金the National Key R&D Program of China(No.2017YFE0198100)the National Natural Science Foundation of China(No.21975250)+1 种基金the Key R&D Program of Jilin Province(No.20220201132GX),the Key R&D Program of Hubei Province(No.2022BAA084)the Capital Construction Fund Projects within the Budget of Jilin Province(2021C037-2).
文摘High-voltage medium-nickel low-cobalt lithium layered oxide cathode materials are becoming a popular development route for high-energy lithium-ion batteries due to their relatively high capacity,low cost,and improved safety.Unfortunately,capacity fading derived from surface lithium residue,electrode-electrolyte interfacial side reactions,and bulk structure degradation severely limits large-scale commercial utilization.In this work,an ultrathin and uniform NASICON-type Li_(3)V_(2)(PO_(4))_(3)(LVP)nanoscale functional coating is formed in situ by utilizing residual lithium to enhance the lithium storage performance of LiNi_(0.6)Co0.05Mn_(0.35)O_(2)(NCM)cathode.The GITT and ex-situ EIS and XPS demonstrate exceptional Li+diffusion and conductivity and attenuated interfacial side reactions,improving the electrode-electrolyte interface stability.The variable temperature in-situ XRD demonstrates delayed phase transition temperature to improve thermal stability.The battery in-situ XRD displays the singlephase H1-H2 reaction and weakened harmful H3 phase transition,minimizing the bulk mechanical degradation.These improvements are attributed to the removal of surface residual lithium and the formation of NASICON-type Li_(3)V_(2)(PO_(4))_(3)functional coatings with stable structure and high ionic and electronic conductivity.Consequently,the obtained NCM@LVP delivers a higher capacity retention rate(97.1%vs.79.6%)after 150 cycles and a superior rate capacity(87 mAh·g^(-1)vs.58 mAh·g^(-1))at a 5 C current density than the pristine NCM under a high cut-off voltage of 4.5 V.This work suggests a clever way to utilize residual lithium to form functional coatings in situ to improve the lithium storage performance of high-voltage medium-nickel low-cobalt cathode materials.
基金supported by The Chinese Academy of Sciences (CAS) President’s International Fellowship Initiative (No. 2023VCB0014)The National Natural Science Foundation of China (No. 52203284)Shenzhen Science and Technology Program (Nos. GJHZ20220913143801003 and RCBS20221008093057026)
文摘Economical water electrolysis requires highly active non-noble electrocatalysts to overcome the sluggish kinetics of the two half-cell reactions,oxygen evolution reaction,and hydrogen evolution reaction.Although intensive efforts have been committed to achieve a hydrogen economy,the expensive noble metal-based catalysts remain under consideration.Therefore,the engineering of self-supported electrocatalysts prepared using a direct growth strategy on three-dimensional(3D)nickel foam(NF)as a conductive substrate has garnered significant interest.This is due to the large active surface area and 3D porous network offered by these electrocatalysts,which can enhance the synergistic eff ect between the catalyst and the substrate,as well as improve electrocatalytic performance.Hydrothermal-assisted growth,microwave heating,electrodeposition,and other physical methods(i.e.,chemical vapor deposition and plasma treatment)have been applied to NF to fabricate competitive electrocatalysts with low overpotential and high stability.In this review,recent advancements in the development of self-supported electrocatalysts on 3D NF are described.Finally,we provide future perspectives of self-supported electrode platforms in electrochemical water splitting.
基金financially supported by the National Natural Science Foundation of China(Nos.51771164,51571173,and 51701175)the National Postdoctoral Program for Innovative Talents of China(No.BX201700204)the Innovation Fund for the Graduate Students of Hebei Province(No.CXZZBS2017057)
文摘In this work,we synthesized LaFeO_3–xwt%Ni(x=0,5,10,15)composites via a solid-state reaction method by adding Ni to the reactants,La_2O_3 and Fe_2O_3.Field-emission scanning electron microscopy(FE-SEM)and energy-dispersive X-ray spectroscopy(EDS)results revealed that Ni powders evenly dispersed among the LaFeO_3 particles and apparently reduced their aggregation,which imparted the composites with a loose structure.Moreover,the Ni formed a conductive network,thus improving the conductivity of the composites.The maximum discharge capacity of the LaFeO_3 electrodes remarkably increased from 266.8 mAh·g^(–1)(x=0)to 339.7 mAh·g^(–1)(x=10).In particular,the high-rate dischargeability of the LaFeO_3–10wt%Ni electrode at a discharge current density of 1500 mA·g^(-1) reached 54.6%,which was approximately 1.5 times higher than that of the pure LaFeO_3.Such a Ni-modified loose structure not only increased the charge transfer rate on the surface of the LaFeO_3 particles but also enhanced the hydrogen diffusion rate in the bulk LaFeO_3.
基金supported financially by the following institutions:the Start-Up Research Funding of the University of Science and Technology,Beijing,China,the National Natural Science Foundation of China(grant no.52102204)the Natural Science Foundation of China(grant no.22309179)+2 种基金Natural Sciences and Engineering Research Council of Canada,University of Waterloo,Canada,and theWaterloo Institute for Nanotechnology,Canada,the Strategic Priority Research Program of the Chinese Academy of Sciences,China(grant no.XDB0600100)the Start-Up Research Funding of ZhouKou Normal University,China(grant no.ZKNUC2022016)the Scientific Research Projects of Universities in Henan Province,China(grant no.24B140017).
文摘To meet the range requirements of electric vehicles,the lithium nickel-rich manganese cobalt oxides(nickel-rich LiNi_(x)Mn_(y)Co_(1-x-y)O_(2);x≥0.5 or NMC)material is a promising contender due to its superior energy and power density.Commercial polycrystalline nickel-rich NMC(PC-NMC)materials typically exhibit layered structures in which primary particles aggregate to form secondary particles to increase the contact area density.Thereby increasing the cathode energy density.However,PC-NMC materials present a number of challenges in terms of cycle life and thermal stability,many of which stem from their extensive surface area,including severe surface phase transitions,intergranular microcracks,oxygen evolution,and transition metal dissolution.To address these challenges,single-crystal NMC(SCNMC)materials were introduced,which exhibited higher capacity retention and thermal robustness owing to their unique structures,characterized by lower active surface area and heightened mechanical strength.Nevertheless,SC-NMC materials also had their own problems,including sluggish Li+bulk diffusion kinetics and nonuniform distribution of lattice strain,as well as their complex high-temperature calcination process.This review concentrates on discussing the merits and demerits of SC-NMC over PC-NMC materials and introduces the current research efforts aimed at improving the electrochemical performance of SC-NMC.
