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A universal performance-enhancing method for Li-S batteries:the cathode material of Li_(2)S@Li_(2)S_(2)@Li_(2)S_(6) double-shell structure

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Science China Chemistry 2024年第4期67卷 1229-1241页

作者： Shunjin yang Yujiang Sun Qiaran Zhang Xiaohu Hu Xing Chen Guoran Li Xiao Sun Yuzhe Zhang Shijie Xu Xinyu Wang yongan yang Institute of Molecular Plus School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China College of Materials Science and Engineering Nankai UniversityTianjin 300350China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China Tianjin Key Laboratory of Advanced Carbon and Electrochemical Energy Storage Tianjin 300072China

Lithium sulfide(Li_(2)S)as a cathode material for lithium-sulfur(Li-S)batteries,one of the most promising advanced batteries in the future,has received tremendous attention in the past ***,developing the practical Li_(2)S cathode confronts challenges of low conductivity for Li-ions and electrons,high sensitivity to environmental moisture,big overpotential barrier to electrochemical activation,and poor cyclability due to the shuttle effect of intermediate *** article herein reports a simple and effective strategy for making Li_(2)S@Li_(2)S_(2)@Li_(2)S_(6) double-shelled microparticles,which can significantly mitigate these *** are synthesized by dissolving Li2S together with S in dimethoxyethane,then drying off the solvent,and finally calcining the collected *** with pure Li_(2)S,such a double-shell material presents a 26.7% improvement in cycling capacity,0.5 V lower in activation overpotential,and prolonged tolerance in the ambient *** density functional theory calculation shows that the performance enhancement lies in the higher stability of Li2S6in contact with moisture and some autocatalytic effect of Li_(2)S_(2)@Li_(2)S_(6).Such a double-shell structure becomes a universal performanceenhancing approach when being combined with other means,such as cathodes composited with catalytic MoS_(2),separators modified with selenium-doped sulfurized-polyacrylonitrile/montmorillonite,electrolytes containing fluorenone additive,and Li anodes coated with a layer of Li_(3)*** corresponding capacity retention shows up to 80%improvement compared with pure Li_(2)S.

关键词： lithium-sulfur batteries lithium sulfide lithium polysulfides cathode performance double shell structure

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Fluorine-Doped High-Performance Li_6PS_5Cl Electrolyte by Lithium Fluoride Nanoparticles for All-Solid-State Lithium-Metal Batteries

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Transactions of Tianjin University 2024年第3期30卷 250-261页

作者： Xiaorou Cao Shijie Xu Yuzhe Zhang Xiaohu Hu Yifan Yan Yanru Wang Haoran Qian Jiakai Wang Haolong Chang Fangyi Cheng yongan yang Institute of Molecular Plus School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China

All-solid-state lithium-metal batteries(ASSLMBs)are widely considered as the ultimately advanced lithium batteries owing to their improved energy density and enhanced safety *** various solid electrolytes,sulfide solid electrolyte(SSE)Li_(6)PS_(5)Cl has garnered significant ***,its application is limited by its poor cyclability and low critical current density(CCD).In this study,we introduce a novel approach to enhance the performance of Li_(6)PS_(5)Cl by doping it with fluorine,using lithium fluoride nanoparticles(LiFs)as the doping *** F-doped electrolyte Li_(6)PS_(5)Cl-0.2LiF(nano)shows a doubled CCD,from 0.5 to 1.0 mA/cm~2 without compromising the ionic conductivity;in fact,conductivity is enhanced from 2.82 to 3.30 mS/cm,contrary to the typical performance decline seen in conventionally doped Li_(6)PS_(5)Cl *** symmetric Li|SSE|Li cells,the lifetime of Li_(6)PS_(5)Cl-0.2LiF(nano)is 4 times longer than that of Li_(6)PS_(5)Cl,achieving 1500 h vs.371 h under a charging/discharging current density of 0.2 mA/cm~*** Li|SSE|LiNbO_3@NCM721 full cells,which are tested under a cycling rate of 0.1 C at 30℃,the lifetime of Li_(6)PS_(5)Cl-0.2LiF(nano)is four times that of Li_(6)PS_(5)Cl,reaching 100 cycles vs.26 ***,the doping of nano-LiF off ers a promising approach to developing high-performance Li_(6)PS_(5)Cl for ASSLMBs.

关键词： Sulfide solid electrolyte All-solid-state lithium batteries Li_6PS_5Cl Lithium fluoride F-doping

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A universal performance-enhancing method for Li-S batteries: the cathode material of LiS@LiS@LiSdouble-shell structure

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Science China Chemistry 2024年

作者： Shunjin yang Yujiang Sun Qiaran Zhang Xiaohu Hu Xing Chen Guoran Li Xiao Sun Yuzhe Zhang Shijie Xu Xinyu Wang yongan yang College of Materials Science and Engineering Nankai University Haihe Laboratory of Sustainable Chemical Transformations Tianjin Key Laboratory of Advanced Carbon and Electrochemical Energy Storage Institute of Molecular Plus School of Chemical Engineering and Technology Tianjin University

Lithium sulfide(Li2S) as a cathode material for lithium-sulfur(Li-S) batteries, one of the most promising advanced batteries in the future, has received tremendous attention in the past decades. However, developing the practical Li2S cathode confronts challenges of low conductivity for Li-ions and electrons, high sensitivity to environmental moisture, big overpotential barrier to electrochemical activation, and poor cyclability due to the shuttle effect of intermediate species. This article herein reports a simple and effective strategy for making Li2S@Li2S2@Li2S6double-shelled microparticles, which can significantly mitigate these problems. They are synthesized by dissolving Li2S together with S in dimethoxyethane, then drying off the solvent, and finally calcining the collected solid. Compared with pure Li2S, such a double-shell material presents a 26.7% improvement in cycling capacity, 0.5 V lower in activation overpotential, and prolonged tolerance in the ambient environment. The density functional theory calculation shows that the performance enhancement lies in the higher stability of Li2S6in contact with moisture and some autocatalytic effect of Li2S2@Li2S6. Such a double-shell structure becomes a universal performanceenhancing approach when being combined with other means, such as cathodes composited with catalytic MoS2, separators modified with selenium-doped sulfurized-polyacrylonitrile/montmorillonite, electrolytes containing fluorenone additive, and Li anodes coated with a layer of Li3N. The corresponding capacity retention shows up to 80% improvement compared with pure Li2S.

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摩西钬激光与传统钬激光在输尿管软镜碎石术中的疗效比较

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中华泌尿外科杂志 2024年第3期45卷 195-201页

作者：高超杨永安马涛杨文增安丰崔振宇周洪月李昱杨伟东河北大学附属医院泌尿外科保定071000

目的比较摩西钬激光与传统钬激光在输尿管软镜碎石术治疗肾结石中的疗效。方法回顾性分析2017年1月至2023年1月于河北大学附属医院接受输尿管软镜钬激光碎石术治疗的425例肾结石患者的临床资料。其中,136例采用传统钬激光进行碎石(普通... 详细信息

目的比较摩西钬激光与传统钬激光在输尿管软镜碎石术治疗肾结石中的疗效。方法回顾性分析2017年1月至2023年1月于河北大学附属医院接受输尿管软镜钬激光碎石术治疗的425例肾结石患者的临床资料。其中,136例采用传统钬激光进行碎石(普通组),289例应用摩西钬激光碎石(摩西组)。为减少由于非随机分配而产生的选择偏差,采用1:1倾向评分匹配(PSM),以保证两组患者的临床基线数据(年龄、性别)和结石特征(结石位置、数量、直径、CT值和结石成分)具有可比性。比较匹配后两组在手术时间、激光作用时间、结石清除率(SFR)、术后并发症和二次治疗方面的差异,并通过多因素logistic回归分析影响SFR的危险因素。进一步比较摩西组与普通组在处理直径≥20mm肾结石的疗效。结果经PSM匹配后,两组各纳人108例。匹配后普通组与摩西组年龄[57.0(49.0,65.0)岁与58.5(51.8,66.0)岁]、性别[男性:58.3%(63/108)与60.2%(65/108)、结石位置(上盏/中盏/下盏/肾孟:33/35/38/42例与35/33/40/42例)、多发结石比例[33.3%(36/108)与35.2%(38/108)]、结石直径[14.0(11.0,16.0)mm与14.0(12.0,17.0)mm]、结石CT值[1115.5(993.2,1228.2)HU与1114.5(1000.2,1216.5)HU]和含钙结石[83.3%(90/108)与79.6%(86/108)等均表现出良好的一致性(绝对标准化均值差异<0.1)。摩西组的手术时间短于普通组[48.5(36.0,56.0)min与60.0(48.8,68.0)min,P<0.01],术后SFR显著高于普通组[88.9%(96/108)与67.6(73/108),(P<0.01)],术后二次手术率更低[1.8%(2/108)与9.3%(10/108),P=0.04]。多因素logistic回归分析结果显示应用摩西钬激光(0R=0.029,P<0.01)、结石直径(OR=1.492P<0.01)、结石CT值(OR=1.007,P<0.01)、含钙结石(OR=1.551,P<0.01)、激光作用时间(OR=0.863,P<0.01)、术前留置双J管(OR=0.193,P<0.01)和术前存在中重度肾积水(OR=1.651,P<0.01)均是SFR的影响因素。在结石长径为20~30mm的患者中,摩西组较普通组的手术时间[50.5(43.8,58.3)min与72.0(68.0,78.0)min]和激光作用时间[29.5(22.8,36.0)min与36.0(32.0,41.0)min]更短,术后SFR更高[65.6%(42/64)与35.3%(6/17)],术后二次手术率更低[7.8%(5/64)与29.4%(5/17)],差异均有统计学意义(P<0.05)。结论输尿管软镜联合摩西钬激光在治疗肾结石方面较于传统钬激光,在提升SFR、缩短手术时间以及降低二次手术率方面表现出显著优势,并证明了其在处理复杂肾结石中的高效性和临床价值。

关键词：肾结石钬激光摩西技术结石清除率输尿管软镜倾向评分匹配

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1D/2D composite subnanometer channels for ion transport:The role of confined water

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Nano Research 2023年第8期16卷 10913-10921页

作者： Yuhao Li Xiaorui Jin Xinhai Yan Xinyu Ai Xin yang Zi-Jian Zheng Kun Huang Gaofeng Zhao yongan yang Meiling Wu Kai-Ge Zhou Institute of Molecular Plus Department of ChemistryTianjin UniversityTianjin 300072China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials Hubei Key Laboratory of Polymer MaterialsHubei UniversityWuhan 430062China School of Chemical Engineering and Analytical Science National Graphene InstituteUniversity of ManchesterManchesterM139PLUK School of Civil Engineering Tianjin UniversityTianjin 300072China

As a mass transport media,water is an alternative of organic solvent applied in rechargeable batteries,due to its unique properties,including fast ionic migration,easy-processibility,economic/environmental friendliness,and flame ***,due to the high activity of water molecules in aqueous electrolytes,the corrosion of metal anode,side reactions,and inferior metal electrodeposition behavior leads to unstable cycling performance,poor Coulombic efficiency(CE),and early-staged failure of *** several attempts to regulate the activity of water,migration of ions is sacrificed,due to the limited methods to control the water ***,we developed a subnanoscale confinement strategy based on a nacre-like structure to modulate the activity of water in the solid *** tuning the ratio between the two-dimensional(2D)vermiculite and one-dimensional(1D)cellulose nanofibers(CNFs),the capillary size in the 1D/2D structure is altered to achieve a fast Zn^(2+)*** dielectric relaxation and molecular dynamics studies indicate that the enhanced Zn^(2+)conductivity is attributed to the fast water relaxation in the precisely defined 1D/2D *** advantage of the regulated activity of the confined water in 2D capillary,the composite vermiculite membrane can suppress the corrosion and side reactions between Zn electrode and water molecular,endowing a reversible Zn^(2+)stripping/plating behavior and a stable cycling performance for 900 *** on our confinement strategy to control the water states by 1D/2D structures,this work will open an avenue toward aqueous energy storage devices with excellent reversibility,high safety,and long-term stability.

关键词： ion transport subnanometer channels confined water aqueous electrolyte limited side reactions

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Production of lithium metal with ion-selective solid electrolytes

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Green Energy & Environment 2020年第4期5卷 382-384页

作者： yongan yang Institute of Molecular Plus Tianjin UniversityNo.92 Weijin RoadTianjin 300072China

The alkali metal lithium(Li)has the smallest density and the most negative Redox potential[1].It is considered as one of the critical elements by many countries[2].The reasons are several-fold:1)Many important applications need huge amounts of Li[3],such as lithium ion batteries(LIBs)as the most famous example,which was honored with the Nobel Prize of Chemistry in 2019[4];2)The abundance of Li in the earth's crust is limited,400 times lower than that of sodium[3];3)The geographical distribution of Li resources is uneven and dilute with 90%in brines[5];4)The mining process is tedious and complicated[3];5)The production of highly-pure Li metal is energy-extensive and cost-inefficient[6];6)It is difficult to recycle many end products of Li,for instance,those Li-containing compounds in LIBs[3].Thus,Li needs to be used wisely,produced economically,and recycled efficiently.

关键词： lithium smallest instance

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Design and realization of a novel multitask TT&C operation pattern

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Journal of Systems Engineering and Electronics 2008年第6期19卷 1243-1249页

作者： yang yongan Han Minzhang Feng Zuren Fan Henghai Bai Jian Xi'an Jiaotong Univ. Xi'an 710049 P. R. China Xi'an Satellite Control Center Xi'an 710043 P. R. China

With the sharp increase of China＇s in-orbit spacecraft and the constraint TT＆C resources, a mathematical model for optimal TT＆C resource allocation is proposed, and the TT＆C facility remote monitoring function is designed to achieve the multitask operation pattern under the unified management of the network management center. With this pattern, the TT＆C network management and the spacecraft management are separated, which is quite different from the previous pattern. Further, a novel spacecraft TT＆C technique based on spacecraft control language is developed, and the telecommanding pattern is designed to address the spacecraft operation problems. The engineering application shows that this pattern fundamentally improves the TT＆C network capability, increases the resource efficiency, and satisfies the efficient, accurate, and flexible operation of spacecraft.

关键词： spacecraft TT&C network multitask TT&C administration design and realization.

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Lithium sulfide nanocrystals as cathode materials for advanced batteries

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Journal of Energy Chemistry 2021年第12期30卷 138-169,I0004页

作者： Fengming Wan Liran Fang Xin Zhang Colin A.Wolden yongan yang Institute of Molecular Plus Tianjin UniversityTianjin 300072China Department of Chemical and Biological Engineering Colorado School of Mines1613 Illinois StreetGoldenCO 80401United States

The ever-increasing need for sustainable development requires advanced battery techniques beyond the current generation of lithium ion *** all candidates being explored,lithium-sulfur batteries are a very promising system to be commercialized in the near *** this end,the development of lithium sulfide(Li_(2)S)nanocrystal-based cathodes has received tremendous effort and witnessed multiple *** from the focus on performance improvement in previous reviews,this review summarizes the research progress in line with the approaches of materials synthesis and electrode *** key chemistry,operation procedure,materials characterizations and performance assessments are all given a balanced ***,all approaches are collectively analyzed along the lines of six criteria towards practical applications,i.e.,electrode performance,materials quality,resources sustainability,production cost,operation procedure,and consumed ***,some perspective viewpoints on the future research directions are offered.

关键词： Lithium sulfide Nanocrystals Cathode materials Advanced batteries

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A mix & act liposomes of phospholipase A2-phosphatidylserine for acute brain detoxification by blood‒brain barrier selective-opening

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Acta Pharmaceutica Sinica B 2024年第4期14卷 1827-1844页

作者： Zinan Zhang Wenbin Cao Huanchun Xing Shuai Guo Lijuan Huang Lin Wang Xin Sui Kui Lu Yuan Luo yongan Wang Jun yang State Key Laboratory of Toxicology and Medical Countermeasures Beijing Institutes of Pharmacology and ToxicologyBeijing 100850China Tianjin University of Science and Technology Tianjin 300222China Hebei University of Science and Technology Shijiazhuang 050018China

In the treatment of central nervous system disease,the blood-brain barrier(BBB)is a major obstruction to drug delivery that must be *** this study,we propose a brain-targeted delivery strat-egy based on selective opening of the *** strategy allows some simple bare nanoparticles to enter the brain when mixed with special opening material;however,the BBB still maintains the ability to completely block molecules from passing *** on the screening of BBB opening and matrix delivery mate-rials,we determined that phospholipase A2-catalyzed 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoserine li-posomes can efficiently carry drugs into the brain *** an effective dose,this delivery system is safe,especially with its effect on the BBB being *** mix&act delivery system has a simple structure and rapid preparation,making it a strong potential candidate for drug delivery across the BBB.

关键词： Liposomes Phospholipase A2 Phosphoserine Blood-brainbarrier Selectively open Mix&act

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Machine learning-assisted sparse observation assimilation for real-time aerodynamic field perception

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Science China(Technological Sciences) 2024年第5期67卷 1458-1469页

作者： ZHAO QingYu HUANG Jun GUO YuXin PAN YuXuan JI JingJing HUANG yongan State Key Laboratory of Intelligent Manufacturing Equipment and Technology School of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Accurate aerodynamic distribution perception and real-time flight state evaluation are crucial for flight safety,e.g.,stall ***,the observations are usually sparse due to limitations in sensor mounting space and cost,and a reconstruction technology is urgently ***,a machine learning-assisted assimilation method based on sparse observations has been *** from the traditional reconstruction methods focusing on boundary condition correction,the proposed method formulates the flow field pressure distribution as a linear superposition of flow field modes,thereby forming a real-time reconstruction pattern that combines offline modal extraction using computational fluid dynamics(CFD)with real-time determination of modal weights using a neural *** this study,CFD simulations were conducted under 800different operating conditions for common modal extraction and model *** weights of these modes were determined online based on merely five observations for reconstructing the full pressure field.A pressure reconstruction with a relative error of 6.1%and a mean square error of 0.003 was achieved within the prescribed condition *** computational cost was just2 ms for each reconstruction run,significantly faster than the 20 min required by the classical reconstruction ensemble transform Kalman *** also showed that the method maintains almost the same accuracy amidst 1.5%measurement *** practical examples,shock waves and the change of lift coefficient were analyzed using the proposed method,providing remarkable evidence for the capability of the method in supporting stall *** validate the method’s effectiveness and explore its potential in real-time and accurate monitoring of an aircraft.

关键词： aerodynamic force sparse observation neural networks pressure field reconstruction

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