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Flat Zn deposition at battery anode via an ultrathin robust interlayer

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Nano Research 2024年第9期17卷 8104-8111页

作者： Yizhou Wang Jianyu Chen Zibo Chen Qian He Zhengnan Tian Jin Zhao yanwen ma Husam N.Alshareef materials Science and Engineering King Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia State Key Laboratory of Organic Electronics and Information Displays(KLOEID)and Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials(IAM)Nanjing University of Posts and TelecommunicationsNanjing 210023China Suzhou Vocational Institute of Industrial Technology Suzhou 215104China

Rechargeable aqueous zinc(Zn)ion batteries(AZIBs)using low-cost and safe Zn metal anodes are considered promising candidates for future grid-scale energy storage systems,but the Zn dendrite problem severely hinders the further prospects of *** Zn depositing behaviors toward horizontal alignment is highly effective and thus has received huge ***,such a strategy is usually based on previous substrate engineering,which requires complex preparation or expensive ***,it is essential to develop a novel solution that can realize horizontally aligned Zn flake deposition via easy operation and low ***,we report an ultrathin and robust Kevlar membrane as the interlayer to mechanically suppress Zn dendrite *** to the randomly distributed flaky dendrites in the control group,the deposited Zn sheets would grow into parallel alignment with the existence of such *** the dendrites are effectively suppressed,Zn||Cu asymmetric,Zn||Zn symmetric,and Zn||MnO_(2)full batteries using Kevlar interlayer deliver significantly improved cycling ***,the Zn||MnO_(2)pouch cell using a Kevlar interlayer delivers stable cycling performance and shows stable operation during multi-angle *** believe this work provides a new possibility for regulating Zn deposition from a crystallographic perspective.

关键词： Zn metal anodes Zn dendrites aqueous Zn ion batteries dendrite suppression (002)crystal plane

Nitrogen and fluorine co-doped graphene for ultra-stable lithium metal anodes

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Nano Research 2024年第8期17卷 7212-7220页

作者： Pan Li Yifan Liu Xujian Bao Jinghao Xie Zhao Li Hongcheng Li Qiang Ren Xiaomiao Feng Yue Hu yanwen ma State Key Laboratory for Organic Electronics and Information Displays(KLOEID)and Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials(IAM)Nanjing University of Posts and TelecommunicationsNanjing 210023China Key Laboratory of Carbon materials of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325000China

The heteroatom doping strategies have been utilized to effectively improve the performance of the carbon-based hosts,such as graphene,for lithium(Li)metal in high energy density lithium metal ***,solely doped graphene hosts often need the assistance of other materials with either better lithiophilicity or electronic conductance to achieve smooth and efficient deposition of Li,which adds extra weight or ***,graphene co-doped by nitrogen and fluorine(NFG)is employed as a stable host for Li,where the N-doping provides lithiophilicity and electronic conductivity lacked by F-doping and the F-doping facilitates fast formation of solid electrolyte interphase(SEI)retarded by *** well regulation of Li plating/stripping and SEI formation is verified by quickly stabilized and small-magnitude voltage hysteresis,which stands out in Li hosts based on doped graphene and leads to excellent long-term cycling performance of NFG based electrodes.A voltage hysteresis of 20 mV is observed for more than 850 h in the symmetrical *** remarkable efficiency of lithium usage is confirmed by the highcapacity retention of a full cell paired with LiFePO_(4)(LFP),which exceeds 70%after 500 *** work presents an innovative perspective on the control of Li plating/stripping by simultaneously introducing two kinds of dopants into graphene and paving the way for exploring practical Li metal batteries.

关键词： Co-doped graphene lithium metal anode dendrite suppression lithiophilic skeleton solid electrolyte interphase(SEI)formation

Enhancing the electrochemical performance of Na metal anodes via local eutectic melting in porous Al-Cu alloy hosts

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Nano Research 2024年第7期17卷 6111-6118页

作者： Tao Hu Qiang Wu Cheng Wang Jialu Chen Fu Su Zibo Chen Yizhou Wang Jianyu Chen yanwen ma Jin Zhao State Key Laboratory of Organic Electronics and Information Displays&Institute of Advanced materials(IAM) Nanjing University of Posts&Telecommunications9 Wenyuan RoadNanjing 210023China materials Science and Engineering King Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia Suzhou Vocational Institute of Industrial Technology 1 Zhineng AvenueSuzhou International Education ParkSuzhou 215104China

Sodium(Na)metal batteries(SMBs)have emerged as promising alternatives to lithium metal batteries for large-scale energy storage applications,owing to their cost-effectiveness,abundance,and favorable redox ***,the practical implementation of SMBs faces several challenges associated with the Na metal anode,including the formation of dendrites,low Coulombic efficiency,and capacity ***,we propose a novel approach to enhance the electrochemical performance of Na metal anodes through a porous Al-Cu alloy host(PAC)fabricated by a local eutectic melting *** local eutectic melting facilitates the development of a conductive network,offering mechanical support,and the porous structure provides abundant channels for the diffusion of Na ions and accommodates volume fluctuations in the Na metal during charge–discharge ***,the PAC exhibits a high average Coulombic efficiency of 99.8%at 1 ma·cm^(−2)for 1 mah·cm^(−2)and a low voltage polarization of 19 mV during 500 *** study provides valuable insight into the design and fabrication of highperformance Na metal anodes,which hold significant promise for the advancements of next-generation energy storage systems.

关键词： Na metal anode porous Al-Cu alloy porous current collector local eutectic melting

Metal–organic compounds as promising anode materials for potassium ion batteries: A mini review

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Energy Reviews 2024年第1期3卷 90-108页

作者： Jinquan Wen Qian Liu Ling Bai Zhen-Dong Huang yanwen ma State Key Laboratory for Organic Electronics and Information Displays&Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials(IAM)Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)Nanjing University of Posts and Telecommunications9 Wenyuan RoadNanjing 210023PR China

Potassium-ion batteries(PIBs)represent one of the most promising alternatives to lithium-ion batteries(LIBs),owing to their exceptional attributes such as high voltages,potent power capabilities,and ***,challenges arise from the sluggish kinetics and significant volume expansion observed during the insertion/extraction of large-radii potassium ions,leading to subpar rate performance and considerable capacity degradation in potassium-ion ***,it becomes imperative to explore advanced anode materials exhibiting high electrochemical activity and robust structural *** this regard,the present review focuses on recent progress in metal-organic compounds(MOCs)as anode materials for potassium-ion batteries,systematically discussing their outstanding merits from the perspective of metal ***,the principal mechanism of K ion storage within relevant MOCs is ***,a comprehensive summary of existing drawbacks that hinder the broader application of MOCs-based materials is provided,along with proposed guidelines and strategies for addressing the inferior performance *** review serves to illuminate the development of MOCs-based anode materials for potassium-ion batteries and offers a valuable reference for future research endeavors.

关键词： Potassium ion batteries Anode materials Metal organic compounds Metals organic frameworks

用于锂金属电池的聚合物固态电解质的研究进展

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化学学报 2024年第4期82卷 449-457页

作者：谷琪刘夏夏周鑫宇李江林秀婧马延文南京邮电大学信息材料与纳米技术研究院有机电子与信息显示国家重点实验室南京210023

聚合物固态电解质因其质轻安全、结构可设计以及优异的机械性能,成为高能量密度、高安全性全固态电池的潜在材料,逐渐成为研究的重点.但因其结晶度高、室温离子电导率低等缺陷也限制其进一步商业化.本综述梳理了近年来比较优越的聚合物... 详细信息

聚合物固态电解质因其质轻安全、结构可设计以及优异的机械性能,成为高能量密度、高安全性全固态电池的潜在材料,逐渐成为研究的重点.但因其结晶度高、室温离子电导率低等缺陷也限制其进一步商业化.本综述梳理了近年来比较优越的聚合物固态电解质种类,包括聚醚类聚合物、聚碳酸酯类聚合物、氟化聚合物、聚离子液体聚合物、单离子传导聚合物,围绕如何提升离子电导率,重点回顾了针对不同基质的结构设计和合成工艺方面的创新.最后阐述了聚合物固态电解质目前面临的基础研究和应用问题,以期为新型聚合物固态电解质的设计与制备提供新思路.

关键词：锂金属电池固态电解质聚合物电解质结构设计合成工艺

Numerical investigation of Richtmyer-Meshkov instability driven by cylindrical shocks

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Acta Mechanica Sinica 2006年第1期22卷 9-16页

作者： Baolin Tian Dexun Fu yanwen ma LNM Institute of Mechanics Chinese Academy of SciencesBeijing 100080 China Institute of Applied Physics and Computational mathematics Beijing 100088 China

In this paper, a numerical method with high order accuracy and high resolution was developed to simulate the Richtmyer-Meshkov（RM） instability driven by cylindrical shock waves. Compressible Euler equations in cylindrical coordinate were adopted for the cylindrical geometry and a third order accurate group control scheme was adopted to discretize the equations. Moreover, an adaptive grid technique was developed to refine the grid near the moving interface to improve the resolution of numerical solutions. The results of simulation exhibited the evolution process of RM instability, and the effect of Atwood number was studied. The larger the absolute value of Atwood number, the larger the perturbation amplitude. The nonlinear effect manifests more evidently in cylindrical geometry. The shock reflected from the pole center accelerates the interface for the second time, considerably complicating the interface evolution process, and such phenomena of reshock and secondary shock were studied.

关键词： Richtmyer-Meshkov instability Atwoodnumber cylindrical shock

DNS of compressible turbulent boundary layer around a sharp cone

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Science China(Physics,Mechanics & Astronomy) 2008年第6期51卷 699-714页

作者： LI XinLiang FU DeXun ma yanwen State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing 100080China

Direct numerical simulation of the turbulent boundary layer over a sharp cone with 20° cone angle (or 10° half-cone angle) is performed by using the mixed seventh- order up-wind biased finite difference scheme and sixth-order central difference scheme. The free stream mach number is 0.7 and free stream unit Reynolds number is 250000/inch. The characteristics of transition and turbulence of the sharp cone boundary layer are compared with those of the flat plate boundary layer. Statistics of fully developed turbulent flow agree well with the experimental and theoretical data for the turbulent flat-plate boundary layer flow. The near wall streak-like structure is shown and the average space between streaks (normalized by the local wall unit) keeps approximately invariable at different streamwise locations. The turbulent energy equation in the cylindrical coordinate is given and turbulent en-ergy budget is studied. The computed results show that the effect of circumferen-tial curvature on turbulence characteristics is not obvious.

关键词： direct numerical simulation boundary layer transition sharp-cone turbulent kinetic energy budget

Direct numerical simulation of passive scalar in decaying compressible turbulence

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Science China(Physics,Mechanics & Astronomy) 2004年第1期47卷 52-63页

作者： LI Xinliang FU Dexun ma yanwen State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Beijing 100080 China State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Beijing 100080 China State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Beijing 100080 China

The passive scalars in the decaying compressible turbulence with the initial Reynolds number (defined by Taylor scale and RMS velocity) Re=72, the initial turbulent mach numbers (defined by RMS velocity and mean sound speed) Mt=0.2—0.9, and the Schmidt numbers of passive scalar Sc=2—10 are numerically simulated by using a 7th order upwind difference scheme and 8th order group velocity control scheme. The computed results are validated with different numerical methods and different mesh sizes. The Batchelor scaling with k -1 range is found in scalar spectra. The passive scalar spectra decay faster with the increasing turbulent mach number. The extended self-similarity (ESS) is found in the passive scalar of compressible turbulence.

关键词： passive scalar, decaying compressible turbulence, direct numerical simulation.

Advanced Current Collectors for Alkali Metal Anodes

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Chemical Research in Chinese Universities 2020年第3期36卷 386-401页

作者： CHEN Jianyu XU Xin HE Qian ma yanwen Kev Laboratory for Organic Electronics and Information Displays Jiangsu Key Laboratory for BiosensorsInstitute of Advanced Materials(LAM)Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAK1)Nanjing University of Posts&TelecommunicationsNanjing 210023P.R.China

High-energy-density batteries are in urgent need to solve the ever-increasing energy stroage demand for portable electronic devices,electric vehicles,and renewable solar and wind energy *** metals,typically lithium(Li),sodium(Na)and potassium(K),are considered as the promising anode materials owing to their low electrochemical potential,low density,and high theoretical gravimetric ***,the problem of dendrite growth of alkali metals during their plating/stripping process will lead to low Coulombic efficiencies,a short lifespan and huge volume expansion,eventually hindering their practical *** resolve this issue,a very effective approach is engineering the anodes on structured current *** review summarizes the development of the alkali metal batteries and discusses the recent advances in rational design of anode current ***,the challenges and strategies of suppressing alkali-metal dendrite growth are *** the special attention is paid to the novel current collector design for dendrite-free alkali metal ***,we give conclusions and perspective on the current challenges and future research directions toward advanced anode current collectors for alkali metal batteries.

关键词： High-energy-density battery Alkali metal anode Dendrite growth Growth mechanism Current collector