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External field–assisted batteries toward performance improvement

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SusMat 2023年第2期3卷 146-159页

作者： Wanwan Wang yi-chun lu Institute of Materials Research and Engineering(IMRE) Agency for ScienceTechnology and Research(A*STAR)Singapore Electrochemical Energy and Interfaces Laboratory Department of Mechanical and Automation EngineeringThe Chinese University of Hong KongShatinHong Kong SARChina

Rechargeable batteries are essential for the increased demand for energy storage technologies due to their ability to adapt intermittent renewable energies into electric devices,such as electric *** boost the battery performance,applying external fields to assist the electrochemical process has been developed and exhibits significant merits in energy efficiency and cycle stability *** perspective focuses on recent advances in the development of external field–assisted battery technologies,including photo-assisted,magnetic field–assisted,sound field–assisted,and multiple field–*** workingmechanisms of external field–assisted batteries and their challenges and opportunities are highlighted.

关键词： external field magnetic field-assisted mechanism photo-assisted rechargeable battery

The Potassium−Air Battery:Far from a Practical Reality?

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Accounts of Materials Research 2021年第7期2卷 515-525页

作者： Wanwan Wang yi-chun lu Electrochemical Energy and Interfaces Laboratory Department of Mechanical and Automation EngineeringThe Chinese University of Hong KongShatinNew Territories 999077Hong Kong SARChina

CONSPECTUS:An energy storage system is the key bottleneck toward the widespread use of renewable energy and the development of electric vehicles(EVs).Alkali metal−oxygen batteries,which have higher gravimetric energy densities(3500−935 Wh kg−1)than conventional lithium−ion batteries(100−265 Wh kg−1),are considered to be one of the promising next-generation energy storage *** the past decade,Li−O2 batteries have been the center of the research effort owing to their highest energy ***,the poor reversibility,low round-trip efficiency,and limited cycle life originating from sluggish kinetic and serious parasitic chemistry induced by singlet oxygen hamper the development of Li−O2 *** the sluggish kinetics and severe parasitic reactions are closely related to the discharge product *** Li−O2 batteries,K−O2 batteries based on potassium superoxide offer an attractive theoretical energy density(935 Wh kg−1)with a significantly improved energy efficiency and lifetime compared to other alkali metal−O2 *** fast and reversible O2/KO2 single−electron reaction exhibits higher redox kinetics compared to the Li−O2 redox chemistries and removes the needs of catalysts or redox *** addition,the earth abundant K greatly alleviates the global shortage and uneven regional distribution of *** unique advantages of the K−O2 system make it a promising candidate for low-cost and large-scale energy ***,the development of a K−O2 battery is still in its early stages and its round-trip efficiency is still lower than that of lithium−ion *** improvement in energy efficiency and cycle life of the K−O2 batteries is crucial prior to practical *** present Account combines our efforts and other representative works on fundamental understandings and design strategies toward next-generation K−O2 *** are offered on oxygen electrode reversibility and stability,anode stabilization and alternat

关键词： battery Battery electrolyte

A Low-Crossover and Fast-Kinetics Thiolate Negolyte for Aqueous Redox Flow Batteries

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Energy Material Advances 2022年第1期2022卷 377-387页

作者： Bin Yang Zengyue Wang Wanwan Wang yi-chun lu Electrochemical Energy and Interfaces Laboratory Department of Mechanical and Automation EngineeringThe Chinese University of Hong KongShatinN.T.999077Hong Kong SARChina

Aqueous redox flow batteries(ARFBs)are a promising technology for large-scale energy *** high-capacity and long-cycle negolyte materials is one of major challenges for practical *** polysulfide is promising for ARFBs owing to its low cost and high ***,it suffers from severe crossover resulting in low coulombic efficiency and limited *** are more resistant to crossover than polysulfides owing to their bulky structures,but they suffer from slow reaction ***,we report a thiolate negolyte prepared by an exchange reaction between a polysulfide and an organosulfide,preserving low crossover rate of the organosulfide and high reaction kinetics of the *** thiolate denoted as 2-hydroxyethyl disulfide+potassium polysulfide(HEDS+K_(2)S_(2))shows reduced crossover rate than K_(2)S_(2),faster reaction kinetics than HEDS,and longer lifespan than both HEDS and K_(2)S_(2).The 1.5M HEDS+1.5M K_(2)S_(2)static cell demonstrated 96 Ah L^(-1)negolyte over 100 and 200 cycles with a high coulombic efficiency of 99.2%and 99.6%at 15 and 25mAcm^(-2),*** 0.5M HEDS+0.5M K_(2)S_(2)flow cell delivered a stable and high capacity of 30.7 Ah L^(-1)negolyte over 400 cycles(691 h)at 20mAcm^(-2).This study presents an effective strategy to enable lowcrossover and fast-kinetics sulfur-based negolytes for advanced ARFBs.

关键词： sulfide kinetics crossover

Design strategies for low temperature aqueous electrolytes

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Nano Research Energy 2022年第1期1卷 78-89页

作者： Liwei Jiang Dejian Dong yi-chun lu Electrochemical Energy and Interfaces Laboratory Department of Mechanical and Automation EngineeringThe Chinese University of Hong KongHong Kong SARChina

Low temperature aqueous batteries(LT-ABs)have attracted extensive attention recent *** LT-ABs suffer from electrolyte freezing,slow ionic diffusion and sluggish interfacial redox kinetics at low *** this review,we discuss physicochemical properties of aqueous electrolytes in terms of phase diagram,ion diffusion and interfacial redox kinetics to guide the design of low temperature aqueous electrolytes(LT-AEs).Firstly,the characteristics of equilibrium and non equilibrium phase diagrams are introduced to analyze the antifreezing mechanisms and propose design strategies for ***,the temperature/concentration/charge carrier dependence conductivity characteristics in aqueous electrolytes are reviewed to comprehend and regulate the ion diffusion ***,we introduce interfacial studies in aqueous and non-aqueous batteries and propose potential improvement strategies for interfacial redox kinetics in ***,we summarize design strategies of LT-AEs for developing high performance LT-ABs.

关键词： aqueous electrolytes low temperature phase diagram ionic diffusion interfacial redox kinetics

Carbon-Nitride-Based Materials for Advanced Lithium-Sulfur Batteries

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Nano-Micro Letters 2022年第12期14卷 579-601页

作者： Wenhao Sun Zihao Song Zhenxing Feng Yaqin Huang Zhichuan J.Xu yi-chun lu Qingli Zou State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029People’s Republic of China Electrochemical Energy and Interfaces Laboratory Department of Mechanical and Automation EngineeringThe Chinese University of Hong KongHong Kong Special Administrative Region 999077People’s Republic of China School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Republic of Singapore School of Chemical Biologicaland Environmental EngineeringOregon State UniversityCorvallisOR 97331USA

Lithium-sulfur(Li-S)batteries are promising candidates for next-generation energy storage systems owing to their high energy density and low ***,critical challenges including severe shuttling of lithium polysulfides(LiPSs)and sluggish redox kinetics limit the practical application of Li-S *** nitrides(C_(x)N_(y)),represented by graphitic carbon nitride(g-C_(3)N_(4)),provide new opportunities for overcoming these *** a graphene-like structure and high pyridinic-N content,g-C_(3)N_(4) can effectively immobilize LiPSs and enhance the redox kinetics of S *** addition,its structure and properties including electronic conductivity and catalytic activity can be regulated by simple methods that facilitate its application in Li-S ***,the recent progress of applying C_(x)N_(y)-based materials including the optimized g-C_(3)N_(4),g-C_(3)N_(4)-based composites,and other novel C_(x)N_(y) materials is systematically reviewed in Li-S batteries,with a focus on the structure-activity *** limitations of existing C_(x)N_(y)-based materials are identified,and the perspectives on the rational design of advanced C_(x)N_(y)-based materials are provided for high-performance Li-S batteries.

关键词： Lithium-sulfur batteries Carbon nitride Polysulfide conversion Shuttle effect Anode protection

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Recent progress in organic redox flow batteries:Active materials,electrolytes and membranes

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Journal of Energy Chemistry 2018年第5期27卷 1304-1325页

作者： Hongning Chen Guangtao Cong yi-chun lu Electrochemical Energy and Interfaces Laboratory Department of Mechanical and Automation Engineering The Chinese University of Hong Kong

Redox flow batteries （RFBs） have great potentials in the future applications of both large scale energy storage and powering the electrical vehicle. Critical challenges including low volumetric energy density. high cost and maintenance greatly impede the wide application of conventional RFBs based on inorganic materials. Redox-active organic molecules have shown promising prospect in the application of RFBs, benefited from their low cost, vast abundance, and high tunability of both potential and solubility. In this review, we discuss the advantages of redo~ active organic materials over their inorganic compart and the recent progress of organic based aqueous and non-aqueous RFBs. Design considerations in active materi- als, choice of electrolytes and membrane selection in both aqueous and non-aqueous RFBs are discussed. Finally. we discuss remaining critical challenges and suggest future directions for improving organic based RFBs.

关键词： Organic materials Electrolyte MembraneFlow battery Low cost

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提升液流电池能量密度的策略

物理化学学报 2022年第6期38卷 4-16页

作者：从广涛卢怡君深圳大学化学与环境工程学院低维材料基因工程研究院广东深圳518060 香港中文大学机械与自动化工程系电化学能源与界面实验室中国香港999077

液流电池因为具有高储能效率,低成本,以及可解耦的能源储存和功率输出设计,被广泛认为是适用于大型储能的首选技术。但是长期以来,液流电池在电网中的大规模部署一直受限于现有的金属基活性材料的高成本和较低的储能密度。因其潜在的低... 详细信息

液流电池因为具有高储能效率,低成本,以及可解耦的能源储存和功率输出设计,被广泛认为是适用于大型储能的首选技术。但是长期以来,液流电池在电网中的大规模部署一直受限于现有的金属基活性材料的高成本和较低的储能密度。因其潜在的低成本,丰富的原材料来源,高度可调的分子结构,具有氧化还原活性的有机分子作为潜在的液流电池活性材料,受到越来越多的关注。本文首先介绍了液流电池的工作机制,以提升非水系有机液流电池的储能密度的策略为重点,总结了非水系液流电池中有机活性材料的研究进展。并讨论了这些策略存在的问题和未来的发展方向。

关键词：具有氧化还原活性的有机分子液流电池储能密度功率输出密度

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Numerical Study of Flow and Heat Transfer Characteristics of Shell-and-Tube Molten Salt Electric Heater with Circularly Perforated Baffles

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Journal of Thermal Science 2025年第1期34卷 24-33页

作者： LIN Yongjie ZHANG Cancan WU Yuting ZHANG yi lu Yuanwei Key Laboratory of Heat Transfer and Energy Conversion National User-Side Energy Storage Innovation Research and Development CenterBeijing University of Technology

Numerical simulations of the flow and heat transfer characteristics of four shell-and-tube molten salt electric heaters with different perforation rates was ***-and-tube electric heaters have the same geometry and tube arrangement,and all of them use single segmental baffles,but there exist four different baffle openings（φ）,i.e.,0%,2.52%,4.06%,and 6.31%.The results indicated that the reasonable baffle opening could significantly reduce the shell-side pressure drop,effectively decreasing the shell-side flow dead zone *** can eliminate the local high-temperature phenomenon on the surface of electric heating tubes,but the heat transfer coefficient is slightly *** perforated schemes significantly reduce shell-side pressure drop compared to the baseline solution without open *** particular,the φ=6.31% scheme exhibits the optimal performance among all the schemes,with a maximum reduction of up to 50.50% in shell-side pressure drop relative to the unopened holes *** heat transfer coefficient is the highest for φ=0%,exhibiting a range of5.26% to 5.73%,5.14% to 5.99%,and 7.31% to 8.54% higher than φ=2.52%,4.06%,and 6.31%,respectively,within the calculated *** composite index h/（Δp）1/3was higher for all open-hole solutions than that for the unopened-hole *** best overall performance was for φ=6.31%,which improved the composite index by15.29% to 17.18% over the unopened-hole solution.

关键词： molten salt electric heater perforated baffles heat transfer

Identifying the dynamic behaviors in complete reconstruction of Co-based complex precatalysts during electrocatalytic oxygen evolution

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Journal of Energy Chemistry 2025年第1期100卷 226-233页

作者： Jingfang Zhang Danyang Wu Linke Cai Youluan lu Fanpeng Cheng Lijuan Shi Qun yi Yao Liu yi Huang Key Laboratory of Green Chemical Engineering Process of Ministry of Education Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education Hubei Key Laboratory of Novel Reactor and Green Chemical Technology School of Chemical Engineering & Pharmacy Wuhan Institute of Technology Key Laboratory of Pesticide & Chemical Biology of Ministry of Education Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction of Ministry of Education College of Chemistry Central China Normal University College of Materials Science and Engineering Fuzhou University

Transition metal-based nanomaterials have emerged as promising electrocatalysts for oxygen evolution reaction（OER）. Considerable research efforts have shown that self-reconstruction occurs on these nanomaterials under operating conditions of OER process. However, most of them undergo incomplete reconstruction with limited thickness of reconstruction layer, leading to low component utilization and arduous exploration of real catalytic mechanism. Herein, we identify the dynamic behaviors in complete reconstruction of Co-based complexes during OER. The hollow phytic acid（PA） cross-linked CoFe-based complex nanoboxes with porous nanowalls are designed because of their good electrolyte penetration and mass transport ability, in favor of the fast and complete reconstruction. A series of experiment characterizations demonstrate that the reconstruction process includes the fast substitution of PA by OH-to form Co（Fe）(OH)xand subsequent potential-driven oxidation to Co（Fe）OOH. The obtained CoFeOOH delivers a low overpotential of 290 mV at a current density of 10 mA cm-2and a long-term *** experiment results together with theory calculations reveal that the Fe incorporation can result in the electron rearrangement of reconstructed CoFeOOH and optimization of their electronic structure,accounting for the enhanced OER activity. The work provides new insights into complete reconstruction of metal-based complexes during OER and offers guidelines for rational design of high-performance electrocatalysts.

关键词： Oxygen evolution reaction