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Structure engineering of cathode host materials for Li-S batteries

Rare Metals 2024年第4期43卷 1370-1389页

作者： Jia-Jun Long Hua Yu Wen-Bo Liu School of New Energy and materials Southwest Petroleum University School of Mechanical Engineering Sichuan University

Although lithium-sulfur batteries are one of the favorable candidates for next-generation energy storage devices,a few key challenges that have not been addressed have limited its commercialization.These challenges include lithium dendrite growth in the anode side,volume change of the active material,poor electrical conductivity,dissolution and migration of poly sulfides,and slow rate of solid-state reactions in the cathode side.Since the electrochemical performance of lithium-sulfur batteries is greatly affected by the design of the cathode host material,it has also been widely discussed in addressing the abovementioned issues.In this paper,three design ideas of cathode host materials in terms of microstructure,crystal structure and electronic structure are introduced and summarized.Crucially,the current progress of these three structural design strategies and their effects on the electrochemical performance of lithium-sulfur batteries are discussed in detail.Finally,future directions in the structural design of cathode materials for lithium-sulfur batteries are discussed and further perspectives are provided.

关键词： Lithium–sulfur batteries Structure engineering Cathode host materials

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Synthesis,characterization and applications of vinylsilafluorene copolymers:New host materials for electroluminescent devices

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Science China Chemistry 2010年第11期53卷 2329-2336页

作者： CHEN RunFeng ZHU Rui ZHENG Chao FAN QuLi HUANG Wei Key Laboratory for Organic Electronics&Information Displays(KLOEID) Institute of Advanced Materials(IAM)Nanjing University of Posts and Telecommunications(NUPT)Nanjing 210046China

Vinylsilafluorene(VSiF) was successfully synthesized and copolymerized with vinylcarbazole and methyl methacrylate via free radical copolymerization for the first time.The synthesis,photophysical properties,computational modeling studies,and organic light-emitting devices of the VSiF copolymers were presented.The good coordinated photoluminescent(PL) spectra with the absorption of blue light-emitting materials and the high energy band-gap of the VSiF copolymers were observed.Higher triplet band gap(3Eg) to host the blue phosphorescent emitters and better HOMO and LUMO than PVK for electron and hole injection and transportation of the VSiF model compounds were revealed by density functional theory(DFT) calculations.The preliminary device results in applications of these copolymers as host materials for green phosphorescent emitters demonstrate the copolymers of VSiF and vinylcarbazole have comparable device performance of polyvinylcarazole(PVK),suggesting a bright future of VSiF as building blocks for host materials.

关键词： vinylsilafluorene host materials polyvinylsilafluorene

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Designing principles of advanced sulfur cathodes toward practical lithium-sulfur batteries

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SusMat 2022年第1期2卷 34-64页

作者： Hongtai Li Yanguang Li Liang Zhang Institute of Functional Nano and Soft materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhouP.R.China

As one of the most promising candidates for next-generation energy storage systems,lithium-sulfur(Li-S)batteries have gained wide attention owing to their ultrahigh theoretical energy density and low cost.Nevertheless,their road to commercial application is still full of thorns due to the inherent sluggish redox kinetics and severe polysulfides shuttle.Incorporating sulfur cathodes with adsorbents/catalysts has been proposed to be an effective strategy to address the foregoing challenges,whereas the complexity of sulfur cathodes resulting from the intricate design parameters greatly influences the corresponding energy density,which has been frequently ignored.In this review,the recent progress in design strategies of advanced sulfur cathodes is summarized and the significance of compatible regulation among sulfur active materials,tailored hosts,and elaborate cathode configuration is clarified,aiming to bridge the gap between fundamental research and practical application of Li-S batteries.The representative strategies classified by sulfur encapsulation,host architecture,and cathode configuration are first highlighted to illustrate their synergetic contribution to the electrochemical performance improvement.Feasible integration principles are also proposed to guide the practical design of advanced sulfur cathodes.Finally,prospects and future directions are provided to realize high energy density and long-life Li-S batteries.

关键词： host materials Li-S batteries redox kinetics shuttle effect sulfur cathodes

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Selective Introduction of Carbazole and Diphenylamine into Spirofluorenexanthene Core for Different Phosphorescent hosts

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Chinese Journal of Chemistry 2016年第8期34卷 771-777页

作者： Mingli Sun Shouzhen Yue Hongtao Cao Changjin Ou Yan Qian Ting Wang Ligang Chen Yi Zhao Wei Huang iang 150040 China Center for Molecular Systems and Organic Devices (CMSOD) Key Laboratory for Organic Electronics andln-formation Displays & Institute of Advanced Materials (IAM) National Synergistic Innovation Center for Advanced Materials (SICAM) Nanjing University of Posts & Telecommunications Nanjing Jiangsu 210023 China State Key Laboratory on Integrated Optoelectronics College of Electronic Science and Engineering Jilin University Changchun Jilin 130013 China

Built on the spiro[fluorene‐9,9′‐xanthene] (SFX) core and two frequently‐used hole‐transporting groups such as carbazole and diphenylamine, two SFX derivatives, namely SFXCz and SFXDPA, have been synthesized by one‐step reaction for red, green and blue phosphorescent organic light‐emitting devices (PHOLEDs). Though the properties of these two groups are very similar, the devices based on SFXCz and SFXDPA exhibit distinct performances. In blue PHOLEDs, the device based on SFXCz exhibited much better performances than that based on SFXDPA. However, the latter was superior to the former in green and red PHOLEDs. And the red PHOLED based on SFXDPA exhibited maximum current efficiency (CE) of 27.1 cd·A −1 , power efficiency (PE) of 25.0 lm·W −1 , and external quantum efficiency (EQE) of 15.0%. The results show that the introduction of diphenylamine group is suitable for constructing green and red host materials, whereas the introduction of carbazole group is suitable for constructing blue host materials.

关键词： spirofluorenexanthene organic light‐emitting diode host materials triplet energy level charge transport electroluminescence

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