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Multilevel carbon architecture of subnanoscopic silicon for fast‐charging high‐energy‐density lithium‐ion batteries

Carbon Energy 2024年第4期6卷 256-268页

作者： Meisheng Han Yongbiao Mu Lei Wei Lin Zeng tianshou zhao Shenzhen Key Laboratory of Advanced Energy Storage Southern University of Science and TechnologyShenzhenChina SUSTech Energy Institute for Carbon Neutrality Southern University of Science and TechnologyShenzhenChina Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhenChina

Silicon(Si)is widely used as a lithium‐ion‐battery anode owing to its high capacity and abundant crustal ***,large volume change upon cycling and poor conductivity of Si cause rapid capacity decay and poor fast‐charging capability limiting its commercial ***,we propose a multilevel carbon architecture with vertical graphene sheets(VGSs)grown on surfaces of subnanoscopically and homogeneously dispersed Si–C composite nanospheres,which are subsequently embedded into a carbon matrix(C/VGSs@Si–C).Subnanoscopic C in the Si–C nanospheres,VGSs,and carbon matrix form a three‐dimensional conductive and robust network,which significantly improves the conductivity and suppresses the volume expansion of Si,thereby boosting charge transport and improving electrode *** VGSs with vast exposed edges considerably increase the contact area with the carbon matrix and supply directional transport channels through the entire material,which boosts charge *** carbon matrix encapsulates VGSs@Si–C to decrease the specific surface area and increase tap density,thus yielding high first Coulombic efficiency and electrode compaction ***,C/VGSs@Si–C delivers excellent Li‐ion storage performances under industrial electrode *** particular,the full cells show high energy densities of 603.5 Wh kg^(−1)and 1685.5 Wh L^(−1)at 0.1 C and maintain 80.7%of the energy density at 3 C.

关键词： fast charging high energy densities lithium‐ion batteries multilevel carbon architecture subnanoscopic silicon anode

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In Situ Growth of 2D Metal-Organic Framework Ion Sieve Interphase for Reversible Zinc Anodes

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ENERGY & ENVIRONMENTAL MATERIALS 2024年第6期7卷 158-166页

作者： Sun, Jing Jian, Qinping Liu, Bin Lin, Pengzhu zhao, tianshou Hong Kong Univ Sci & Technol Dept Mech & Aerosp Engn Kowloon Clear Water Bay Hong Kong Peoples R China Southern Univ Sci & Technol Dept Mech & Energy Engn Shenzhen 518055 Peoples R China

Zinc metal anodes are gaining popularity in aqueous electrochemical energy storage systems for their high safety, cost-effectiveness, and high capacity. However, the service life of zinc metal anodes is severely constrained by critical challenges, including dendrites, water-induced hydrogen evolution, and passivation. In this study, a protective two-dimensional metal-organic framework interphase is in situ constructed on the zinc anode surface with a novel gel vapor deposition method. The ultrathin interphase layer (similar to 1 mu m) is made of layer-stacking 2D nanosheets with angstrom-level pores of around 2.1 angstrom, which serves as an ion sieve to reject large solvent-ion pairs while homogenizes the transport of partially desolvated zinc ions, contributing to a uniform and highly reversible zinc deposition. With the shielding of the interphase layer, an ultra-stable zinc plating/stripping is achieved in symmetric cells with cycling over 1000 h at 0.5 mA cm(-2) and similar to 700 h at 1 mA cm(-2), far exceeding that of the bare zinc anodes (250 and 70 h). Furthermore, as a proof-of-concept demonstration, the full cell paired with MnO2 cathode demonstrates improved rate performances and stable cycling (1200 cycles at 1 A g(-1)). This work provides fresh insights into interphase design to promote the performance of zinc metal anodes.

关键词： 2D MOF desolvation interphase ion sieve zinc anode DEPOSITION KINETICS CRYSTAL

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Lattice Boltzmann modeling of transport phenomena in fuel cells and flow batteries

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Acta Mechanica Sinica 2017年第3期33卷 555-574页

作者： Ao Xu Wei Shyy tianshou zhao HKUST Energy Institute Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology

Fuel cells and flow batteries are promising technologies to address climate change and air pollution problems. An understanding of the complex multiscale and multiphysics transport phenomena occurring in these electrochemical systems requires powerful numerical tools. Over the past decades, the lattice Boltzmann (LB) method has attracted broad interest in the computational fluid dynamics and the numerical heat transfer communities, primarily due to its kinetic nature making it appropriate for modeling complex multiphase transport phenomena. More importantly, the LB method fits well with parallel computing due to its locality feature, which is required for large-scale engineering applications. In this article, we review the LB method for gas-liquid two-phase flows, coupled fluid flow and mass transport in porous media, and particulate flows. Examples of applications are provided in fuel cells and flow batteries. Further developments of the LB method are also outlined.

关键词： Lattice Boltzmann method Transport phenomena Multiphase flow Fuel cells Flow batteries

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Ab initio prediction of borophene as an extraordinary anode material exhibiting ultrafast directional sodium diffusion for sodium-based batteries

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Science Bulletin 2016年第14期61卷 1138-1144页

作者： Le Shi tianshou zhao Ao Xu Jianbo Xu Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology

Density functional theory calculations and ab initio molecular dynamics simulations are performed to study the feasibility of using borophene, a newly synthesized two-dimensional sheet of boron, as an anode material for sodium-ion and sodium-oxygen batteries. The theo- retical capacity of borophene is found to be as high as 1,218 mAh g-1 （***）. More importantly, it is demonstrated that the sodium diffusion energy barrier along the valley direction is as low as 0.0019 eV, which corresponds to a diffusivity of more than a thousand times higher than that of conventional anode materials such as Na2Ti307 and Na3Sb. Hence, the use of borophene will revolutionize the rate capability of sodium-based batteries. Moreover, it is predicted that, during the sodiation process, the average open-circuit voltage is 0.53 V, which can effectively sup- press the formation of dendrites while maximizing the energy density. The metallic feature and structural integrity of borophene can be well preserved at different sodium concentrations, demonstrating good electronic conductivity and stable cyclability.

关键词： Borophene - Sodium anode Directionaldiffusion Ultrafast diffusivity

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A Li-S battery with ultrahigh cycling stability and enhanced rate capability based on novel ZnO yolk-shell sulfur host

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Journal of Energy Chemistry 2021年第4期30卷 136-144页

作者： Ruihan Zhang Maochun Wu Xinzhuang Fan Haoran Jiang tianshou zhao Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina

Currently,lithium-sulfur(Li-S)batteries still suffer from fast capacity decay,poor coulombic efficiency(CE)and short cycling lifespan,which result from the severe shuttle effect issue caused by high solubility and rapid diffusion of lithium polysulfides(Li PSs)in organic ***,yolk-shell zinc oxide(YSZn O)spheres are synthesized and for the first time,applied as a host for Li-S batteries to tackle this *** polar Zn O exhibits high chemical anchoring ability toward Li PSs while the unique yolk-shell structure not only provides an additional physical barrier to Li PSs but also enables much more uniform sulfur distribution,thus significantly suppressing Li PSs shuttling effect meanwhile promoting sulfur conversion *** a result,the YS-Zn O enables the Li-S battery to display an initial specific capacity of1355 m Ah g^(-1) and an outstanding capacity retention capability(~89.44%retention rate)even after 500 cycles with the average CE of~99.46%at the current of 0.5 *** contrast,the capacity of conventional-Zn O-nanoparticles based battery severely decays to 472 m Ah g^(-1) after cycling for 500 *** impressively,the S/YS-Zn O based Li-S battery can maintain a low decay rate of 0.040%every cycle and high average CE of 98.82%over 1000 cycles at 3 C.

关键词： Yolk-shell structure Lithium-sulfur batteries Zinc oxide Shuttle effect In-situ Raman test

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Ab initio prediction and characterization of phosphorene-like SiS and SiSe as anode materials for sodium-ion batteries

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Science Bulletin 2017年第8期62卷 572-578页

作者： Haoran Jiang tianshou zhao Yuxun Ren Ruihan Zhang Maochun Wu Department of Mechanicol and Aerospace Engineering The Hong Kong University of Science and Technology Hong Kong. Chino

In this work, a density functional theory （DFT） based first-principles study is carried out to investigate tile potential of phosphorene-like SiS and SiSe monolayers as anode materials for sodium-ion （Na-ion） bat- teries. Results show that both SiS and SiSe have large adsorption energies towards single Na atom of 0.94 and -0.43 eV, owing to the charge transfers from Na to SiS or SiSe. In addition, it is found that the highest Na concentration for both SiS and SiSe is x = 1 with the chemical formulas of NaSiS and NaSiSe, corresponding to the high theoretical specific capacities for Na storages of 445.6 and 250.4 mAh g 1, respectively. Moreover, Na diffusions are very fast and show strong directional behaviors on SiS and SiSe monolayers, with the energy barriers of only 0.135 and 0.158 eV, lower than those of con- ventional anode materials for Na-ion batteries such as Na2Ti3O7 （0.19 eV） and Na3Sb （0.21 eV）. Finally, although SiS and SiSe show semiconducting behaviors, they transform to metallic states after adsorbing Na atoms, indicating enhanced electrical conductivity during battery cycling. Given these advantages, it is expected that both SiS and SiSe monolayers are promising anode materials for Na-ion batteries, and in principle, other Na-based batteries as well.

关键词： Na-ion batteries Phosphorene-like SiS SiSe First-principles study Anode materials

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Experimental Investigations on Boiling Heat Transfer Inside Miniature Circular Tubes Immersed in FC-72

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Journal of Thermal Science 2002年第4期11卷 303-307页

作者： Qincheng Bi tianshou zhao Yajun Guo Tingkuan Chen State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an710049China Department of Mechanical Engineering The Hong Kong University of Science&TechnologyHong KongChina School of Environmental and Municipal Administration Engineering Xi’an University of Architecture&TechnologyXi’an710055China

To investigate the size effect on the characteristics of boiling heat transfer, boiling behavior of FC-72 in heated vertical miniature circular tubes immersed in a liquid pool was experimentally studied. Two AISI 304 stainless steel tubes with inner diameters of 1.10 mm and 1.55 mm correspondingly, were heated by swirled Ni-Cr wire heaters and sealed in Lucite blocks by silicon adhesive. Both the top and the bottom ends of the circular test sections were open to the liquid pool. The boiling curves and heat transfer coefficients were obtained experimentally. The boiling behaviors at the outlets of the miniature tubes were also visualized with a digital video camera. Experimental results show that the tube geometry has a significant effect on the boiling characteristics. Vapor blocking at the outlet of the smaller circular tube with a diameter of 1.10 mm caused severe boiling hysteresis phenomena. The CHF decreased with reducing in tube size.

关键词： boiling heat transfer pool boiling FC-72 miniature circular tube.

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Honeycomb‐like hierarchical porous silicon composites with dual protection for ultrastable Li‐ion battery anodes

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SmartMat 2021年第4期2卷 579-590页

作者： Xudong Peng Cheng Xiong Yanke Lin Chen zhao tianshou zhao Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina HKUST Energy Institute The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina

Silicon offers a high theoretical specific capacity for anodic lithium ***,its applications are hindered by the electrode instability caused by the sharp volume change,and the limited rate performance resulted from the insulating ***,we introduce a facile and fast method of preparing honeycomb‐like silicon‐based anodes(MXene‐Si@C)with porous structure using MXene and carbon‐coated *** dual protection from both the surface coating and as‐formed interlayered vacant spaces ameliorate the volume expansion of the silicon and thus reinforce the mechanical stability of the *** addition,the highly conducting MXene and the surface carbon coating form a hierarchical and consecutive electron‐conducting network with evidently reduced *** this proposed composite,a high average Coulombic efficiency of 99.73%and high capacity retention of 82.4%after 300 cycles at 1 A/g can be achieved even with an areal loading around 1.5 mg/cm^(2).Coupled with an NCM523 cathode,the proof‐of‐concept full cell delivers a high capacity of 164.2mAh/g with an extremely high energy density of 574Wh/kg(based on the mass of the electrode materials)at 0.2 C and an excellent cyclability at 0.5 C of 100 cycles with decent capacity retention(80.28%).

关键词： cycling stability lithium‐ion battery self‐assembly silicon‐based anode Ti3C2 MXene

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Monolayer MoS_(2)Fabricated by In Situ Construction of Interlayer Electrostatic Repulsion Enables Ultrafast Ion Transport in Lithium-Ion Batteries

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Nano-Micro Letters 2023年第6期15卷 126-142页

作者： Meisheng Han Yongbiao Mu Jincong Guo Lei Wei Lin Zeng tianshou zhao Shenzhen Key Laboratory of Advanced Energy Storage Department of Mechanical and Energy EngineeringSUSTech Energy Institute for Carbon NeutralitySouthern University of Science and TechnologyShenzhen 518055People’s Republic of China

High theoretical capacity and unique layered structures make MoS_(2)a promising lithium-ion battery anode ***,the anisotropic ion transport in layered structures and the poor intrinsic conductivity of MoS_(2)lead to unacceptable ion transport ***,we propose in-situ construction of interlayer electrostatic repulsion caused by Co^(2+)substituting Mo^(4+)between MoS_(2)layers,which can break the limitation of interlayer van der Waals forces to fabricate monolayer MoS_(2),thus establishing isotropic ion transport ***,the doped Co atoms change the electronic structure of monolayer MoS_(2),thus improving its intrinsic ***,the doped Co atoms can be converted into Co nanoparticles to create a space charge region to accelerate ion ***,the Co-doped monolayer MoS_(2)shows ultrafast lithium ion transport capability in half/full *** work presents a novel route for the preparation of monolayer MoS_(2)and demonstrates its potential for application in fast-charging lithium-ion batteries.

关键词： Monolayer MoS_(2) Interlayer electrostatic repulsion Co atoms doping Surface-capacitance effect Fast-charging lithiumion batteries

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A novel energy storage system incorporating electrically rechargeable liquid fuels as the storage medium

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Science Bulletin 2019年第4期64卷 270-280页

作者： Haoran Jiang Lei Wei Xinzhuang Fan Jianbo Xu Wei Shyy tianshou zhao Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology Clear Water Bay

We propose a novel concept of energy storage that incorporates electrically rechargeable liquid fuels made of electroactive species, known as e-fuels, as the storage medium. This e-fuel energy storage system comprises an e-fuel charger and an e-fuel cell. The e-fuel charger electrically charges e-fuels, while the efuel cell subsequently generates electricity using charged e-fuels whenever and wherever on *** e-fuel energy storage system possesses all the advantages of conventional hydrogen storage systems,but unlike hydrogen, liquid e-fuels are as easy and safe to store and transport as gasoline. The potential efuel candidates have been identified to include inorganic electroactive materials, organic electroactive materials, and suspension of solid electroactive materials. In this work, we demonstrate an example efuel energy storage system for large-scale energy storage using inorganic e-fuels composed of V^(2+)/V^(3+) and VO_2^+/VO_2^+ redox couples, and compare the performance of the e-fuel energy storage system with that of existing technologies. Results show that our e-fuel charger achieves a charge efficiency of as high as～94%, while the e-fuel cell is capable of delivering a peak power density of 3.4 W cm^(-2), which is 1.7 times higher than that of hydrogen fuel cells. More excitingly, the e-fuel energy storage system exhibits a round-trip efficiency of 80.0% and an electrolyte utilization of 83.0% at an ultra-high discharge current density of 1,000 mA cm^(-2), which are 19.9% and 67.3% higher than those of conventional vanadium redox flow batteries. This unprecedented performance allows a 27.0% reduction in the capital cost of the e-fuel energy storage system compared with that of vanadium redox flow batteries.

关键词： Renewable energy Energy storage Batteries E-fuel energy storage system

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