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Analysis of Differences in Electrochemical Performance Between Coin and Pouch Cells for Lithium-Ion Battery Applications

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Energy & Environmental Materials 2024年第3期7卷 59-63页

作者： Yeonguk Son Hyungyeon Cha Taeyong Lee Yujin Kim Adam Boies Jaephil Cho michael de volder department of Engineering University of Cambridge17 Charles Babbage RoadCB30FSCambridge UK department of Chemical Engineering Changwon National UniversityChangwon Gyeongsangnam-do 51140Korea department of Energy Engineering School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology(UNIST) Ulsan 44919Korea

Small coin cell batteries are predominantly used for testing lithium-ion batteries(LIBs)in academia because they require small amounts of material and are easy to ***,insufficient attention is given to difference in cell performance that arises from the differences in format between coin cells used by academic researchers and pouch or cylindrical cells which are used in *** this article,we compare coin cells and pouch cells of different size with exactly the same electrode materials,electrolyte,and electrochemical *** show the battery impedance changes substantially depending on the cell format using techniques including Electrochemical Impedance Spectroscopy(EIS)and Galvanostatic Intermittent Titration Technique(GITT).Using full cell NCA-graphite LIBs,we demonstrate that this difference in impedance has important knock-on effects on the battery rate performance due to ohmic polarization and the battery life time due to Li metal plating on the *** hope this work will help researchers getting a better idea of how small coin cell formats impact the cell performance and help predicting improvements that can be achieved by implementing larger cell formats.

关键词： coin cell full cell lithium-ion batteries pouch cell

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SU8 etch mask for patterning PDMS and its application to flexible fluidic microactuators

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Microsystems & Nanoengineering 2016年第1期2卷 101-105页

作者： Benjamin Gorissen Chris Van Hoof Dominiek Reynaerts michael de volder department of Mechanical Engineering Katholieke Universiteit Leuven&Flanders MakeCelestijnenlaan 300B3001 LeuvenBelgium Imec Kapeldreef 753001 LeuvenBelgium Institute for Manufacturing Department of EngineeringUniversity of Cambridge17 Charles Babbage RoadCambridgeCB30FSUK

Over the past few decades,polydimethylsiloxane(PDMS)has become the material of choice for a variety of microsystem applications,including microfluidics,imprint lithography,and soft *** most of these applications,PDMS is processed by replication molding;however,new applications would greatly benefit from the ability to pattern PDMS films using lithography and *** hardmasks,in conjunction with reactive ion etching(RIE),have been reported as a method for patterning PDMS;however,this approach suffers from a high surface roughness because of metal redeposition and limited etch thickness due to poor etch *** found that a combination of LOR and SU8 photoresists enables the patterning of thick PDMS layers by RIE without redeposition *** demonstrate the ability to etch 1.5-μm pillars in PDMS with a selectivity of ***,we use this process to lithographically process flexible fluidic microactuators without any manual transfer or cutting *** actuator achieves a bidirectional rotation of 50°at a pressure of 200 *** process provides a unique opportunity to scale down these actuators as well as other PDMS-based devices.

关键词： PDMS lithography SU8 etch mask microactuator bending actuator fluidic actuator

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Enhanced composite thermal conductivity by percolated networks of in-situ confined-grown carbon nanotubes

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Nano Research 2023年第11期16卷 12821-12829页

作者： Xiao Zhang Wei Tan Tian Carey Bo Wen delong He Adrees Arbab Alex Groombridge Fiona Smail Jean de La Verpilliere Chengning Yao Yanchun Wang Xiaojun Wei Huaping Liu Sishen Xie Felice Torrisi michael de volder Weiya Zhou Adam Boies Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China department of Engineering University of CambridgeCambridge CB21PZUK Cambridge Graphene Centre Engineering DepartmentUniversity of CambridgeCambridge CB30FAUK UniversitéParis-Saclay Centrale-SupélecENS Paris-SaclayCNRSLMPS-Laboratoire de Mécanique Paris-Saclay91190Gif-sur-YvetteFrance Echion Technologies Cambridge CB223FGUK Molecular Sciences Research Hub Imperial College LondonLondon W120BZUK Dipartimento di Fisica e Astronomia Universita'di CataniaCatania 6495123Italy School of Engineering and Materials Science Queen Mary University of LondonLondon E14NSUK School of Physics CRANN&AMBER Research CentresTrinity College DublinDublin D02 E8C0Ireland Jaguar Land Rover Banbury Road GaydonLighthorne HeathWarwick CV350RRUK

despite the ever-increasing demand of nanofillers for thermal enhancement of polymer composites with higher thermal conductivity and irregular geometry,nanomaterials like carbon nanotubes(CNTs)have been constrained by the nonuniform dispersion and difficulty in constructing effective three-dimensional(3D)conduction network with low loading and desired isotropic or anisotropic(specific preferred heat conduction)***,we illustrated the in-situ construction of CNT based 3D heat conduction networks with different directional ***,to in-situ construct an isotropic percolated conduction network,with spherical cores as support materials,we developed a confined-growth technique for CNT-core sea urchin(CNTSU)*** 21.0 wt.%CNTSU loading,the thermal conductivity of composites reached 1.43±0.13 W/(m·K).Secondly,with aligned hexagonal boron nitride(hBN)as an anisotropic support,we constructed CNT-hBN aligned networks by in-situ CNT growth,which improved the utilization efficiency of high density hBN and reduced the thermal interface resistance between matrix and ***~8.5 wt.%loading,the composites possess thermal conductivity up to 0.86±0.14 W/(m·K),374%of that for neat *** to the uniformity of CNTs in hBN network,the synergistic thermal enhancement from one-dimensional(1D)+two-dimensional(2D)hybrid materials becomes more *** on the detailed experimental evidence,the importance of purposeful production of a uniformly interconnected heat conduction 3D network with desired directional performance can be observed,particularly compared with the traditional direct-mixing *** study opens new possibilities for the preparation of high-power-density electronics packaging and interfacial materials when both directional thermal performance and complex composite geometry are simultaneously required.

关键词： carbon nanotubes hexagonal boron nitride thermal conductivity composites three-dimensional printing

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Electrochemical and structural evolution of structured V_(2)O_(5) microspheres during Li-ion intercalation

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Journal of Energy Chemistry 2021年第4期30卷 108-113页

作者： Sul Ki Park Puritut Nakhanivej Jeong Seok Yeon Kang Ho Shin Wesley M.Dose michael de Voider Jin Bae Lee Hae Jin Kim Ho Seok Park School of Chemical Engineering Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746South Korea Institute for Manufacturing Department of EngineeringUniversity of CambridgeCambridge CB30FSUnited Kingdom department of Chemistry University of CambridgeLensfield RoadCambridge CB21EWUnited Kingdom Research Center for Materials Analysis Korea Basic Science InstituteDaejeonRepublic of Korea SKKU Advanced Institute of Nano Technology(SAINT) Sungkyunkwan University2066SeoburoJangan-guSuwon440-746South Korea department of Health Sciences and Technology Samsung Advanced Institute for Health Sciences and Technology(SAIHST)Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746South Korea

With the development of stable alkali metal anodes,V_(2)O_(5) is gaining traction as a cathode material due to its high theoretical capacity and the ability to intercalate Li,Na and K ***,we report a method for synthesizing structured orthorhombic V_(2)O_(5) microspheres and investigate Li intercalation/deintercalation into this *** industry adoption,the electrochemical behavior of V_(2)O_(5) as well as structural and phase transformation attributing to Li intercalation reaction must be further *** synthesized V_(2)O_(5) microspheres consisted of small primary particles that were strongly joined together and exhibited good cycle stability and rate capability,triggered by reversible volume change and rapid Li ion *** addition,the reversibility of phase transformation(a,e,d,c and xLixV_(2)O_(5))and valence state evolution(5+,4+,and 3.5+)during intercalation/de-intercalation were studied via in-situ X-ray powder diffraction and X-ray absorption near edge structure analyses.

关键词： Lithium ion batteries Vanadium pentoxide(V2O5) In-situ analysis Phase transformation Intercalation/de-intercalation

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利益相关者的介入:中小企业的一个机遇

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产业与环境 2005年第4期27卷 40-43页

作者： michael Kuhndt volder Türk Martin Herrndorf 施静 Wuppertal Institure Research Group 4:Sustainable Production and ConsumptionDoeppersberg 1942103 WuppertalGermany Senior Researcher(and Directortriple innova) Wuppertal Institure Research Group 4:Sustainable Production and ConsumptionDoeppersberg 1942103 WuppertalGermany Research Fellow Wuppertal Institure Research Group 4:Sustainable Production and ConsumptionDoeppersberg 1942103 WuppertalGermany ResearchAssistant

利益相关者的介入和企业社会责任的概念主要在一些大公司的理念中得以发展.随着中小企业对于社会和经济利益之间存在重要联系的意识逐渐加强,这些企业提升了对企业社会责任的重视度.重视企业社会责任对中小企业来说是一次挑战.通过一些... 详细信息

利益相关者的介入和企业社会责任的概念主要在一些大公司的理念中得以发展.随着中小企业对于社会和经济利益之间存在重要联系的意识逐渐加强,这些企业提升了对企业社会责任的重视度.重视企业社会责任对中小企业来说是一次挑战.通过一些外部行为来提高中小企业的积极性,这样能鼓励他们承担企业社会责任,并作出一定的成绩.

关键词：中小企业利益相关者社会责任经济利益公司

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