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Facilitating prelithiation of silicon carbon anode by localized high-concentration electrolyte for high-rate and long-cycle lithium storage

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Carbon Energy 2024年第6期6卷 216-233页

作者： Yuanxing Zhang Borong Wu jiaying bi Xinyu Zhang Daobin Mu Xin-Yu Zhang Ling Zhang Yao Xiao Feng Wu School of Materials Science and Engineering Beijing Institute of TechnologyBeijingChina Chongqing Innovation Center Beijing Institute of TechnologyChongqingChina College of New Energy Xi′an Shiyou UniversityXi′anChina Institute for Carbon Neutralization College of Chemistry and Materials EngineeringWenzhou UniversityWenzhouChina Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjinChina

The commercialization of silicon-based anodes is affected by their low initial Coulombic efficiency(ICE)and capacity decay,which are attributed to the formation of an unstable solid electrolyte interface(SEI)***,a feasible and cost-effective prelithiation method under a localized highconcentration electrolyte system(LHCE)for the silicon-silica/graphite(Si-SiO_(2)/C@G)anode is designed for stabilizing the SEI layer and enhancing the *** thin SiO_(2)/C layers with-NH2 groups covered on nano-Si surfaces are demonstrated to be beneficial to the prelithiation process by density functional theory calculations and electrochemical *** SEI formed under LHCE is proven to be rich in ionic conductivity,inorganic substances,and flexible organic ***,faster Li+transportation across the SEI further enhances the prelithiation effect and the rate performance of Si-SiO_(2)/C@G *** also leads to uniform decomposition and high stability of the SEI with abundant organic *** a result,the prepared anode shows a high reversible specific capacity of 937.5 mAh g^(-1)after 400 cycles at a current density of 1 *** 811‖Li-SSGLHCE full cell achieves a high-capacity retention of 126.15 mAh g^(-1)at 1 C over 750 cycles with 84.82%ICE,indicating the great value of this strategy for Si-based anodes in large-scale applications.

关键词： localized high-concentration electrolytes prelithiation SEI layer silicon anode

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Controllable synthesis of Li3PO4 hollow nanospheres for the preparation of high performance LiFePO4 cathode material

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Particuology 2016年第1期14卷 142-150页

作者： jiaying bi Tongbao Zhang Kai Wang Benhe Zhong Guangsheng Luo The State Key Lab of Chemical Engineering Department of Chemical Engineering Tsinghua University Beijing 100084 China School of Chemical Engineering Sichuan University. Chengdu 610065. China

Lithium phosphate hollow nanospheres were prepared in a membrane dispersion microreactor using aqueous phosphoric acid and lithium hydroxide solutions as reactants. The influences of reactant flow rate ratio and temperature on the purity and morphology of the prepared nanospheres were investigated using X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The results showed that nanospheres prepared in the continuous flow condition had a hollow interior structure with high crystallinity. A possible mechanism for the formation of this hollow structured Li3 PO4 was also pro- posed. Using Li3 PO4 hollow nanospheres as the precursor, LiFePO4 hollow nanospheres were successfully synthesized via a solvothermal route in ethylene glycol. After coating with carbon, the LiFePO4/C hol- low nanospheres exhibited excellent electrochemical performance, especially at high rates, and could discharge124 mAh/g at 10 C, and even 98 mAh/g at 40 C.

关键词： Lithium phosphate Hollow sphere Microreactor Lithium iron phosphate

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Lithiated VO2(M)@Carbon Fibers Hybrid Host for Improving the Cycling Stability of Sulfur Cathode in Lithium-Sulfur Batteries

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Chinese Journal of Chemistry 2020年第12期38卷 1703-1708页

作者： Yuxin Wang Ling Zhang jiaying bi Hao Yang Zhikun Zhao Daobin Mu Borong Wu School of Materials Science and Engineering Beijing Key Laboratory of Environment Science and EngineeringBeijing Higher Institution Engineering Research Center of Power Battery and Chemical Energy MaterialsBeijing Institute of TechnologyBeijing 100081China Collaborative Innovation Center of Electric Vehicles in Beijing Beijing 100081China

of main observation and conclusion We successfully prepared the Li-VO2(M)nanosheets via a facile lithiation *** compositing with conductive carbon fibers,the sulfur host(Li-VO2(M)@CFs)combines the efficient adsorption ability of the VO2(M)with superior electronic conductivity of the carbon ***,carbon fiber cloth used as the current collector can provide the 30 electronic ***,the coin cells exhibited the superior reversible capacity of 1250 mA h g^-1 at 0.2 C and a low capacity decay value of 0.068%per cycle within 416 cycles at 1C,indicative of the favorable cycling ***,even at a high rate of 5C,it also kept at a high discharge capacity of 401 mA h g^-*** conclusion,this work discloses an attractive route to reduce the dissolution loss of lithium polysulfides(UPSs)and enhance the overall performance of Li-S batteries.

关键词： conclusion Sulfur attractive

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表面端基卤化Ti_(3)C_(2) MXene应用于锂离子电池高容量电极材料的研究

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无机材料学报 2022年第6期37卷 660-668页

作者：肖美霞李苗苗宋二红宋海洋李钊毕佳颖西安石油大学材料科学与工程学院西安710065 中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室上海200050

Mxenes以其优异的比表面积、高导电率和组分可调性而受到广泛研究,并用作高效锂离子电池的电极材料。然而,其有限的存储容量以及锂离子扩散引起的剧烈晶格膨胀限制了MXenes作为电极材料的应用。本研究设计了具有代表性的MXene材料卤化(... 详细信息

Mxenes以其优异的比表面积、高导电率和组分可调性而受到广泛研究,并用作高效锂离子电池的电极材料。然而,其有限的存储容量以及锂离子扩散引起的剧烈晶格膨胀限制了MXenes作为电极材料的应用。本研究设计了具有代表性的MXene材料卤化(氟化、氯化或溴化)-Ti_(3)C_(2)。采用基于密度泛函理论的范德瓦耳斯修正的第一性原理计算方法研究了表面端基(T=F^(-)、Cl^(-)和Br^(-))修饰对锂离子电池中Ti_(3)C_(2)负极的原子结构、电学性质、力学性质以及电化学性能的影响。研究表明,Ti_(3)C_(2)T_(2)单层具有良好的结构稳定性、力学性质和导电性质。相比Ti_(3)C_(2)F_(2)和Ti_(3)C_(2)Br_(2),Ti_(3)C_(2)Cl_(2)单层具有较大的弹性模量(沿二维薄膜两个方向的弹性模量分别为321.70和329.43 N/m)、较低的锂离子扩散势垒(0.275 eV)、开路电压(0.54 V)和较大的理论存储容量(化学计量比为Ti_(3)C_(2)Cl_(2)Li_(6)时达674.21 mA·h/g),这表明Ti_(3)C_(2)Cl_(2)单层作为锂电池电极具有良好的安全稳定性和充放电速率。此外,端基氯化扩大了层间距,进而提高了Ti_(3)C_(2)Cl_(2)中锂离子的可穿透性和快速充放电速率。本研究表明,表面氯化的Ti_(3)C_(2)纳米薄膜是一种很有前途的锂电池负极材料,为其它的MXenes基电极材料设计与开发提供了重要的设计思路。

关键词： MXenes Ti_(3)C_(2) 表面端基修饰第一性原理计算锂离子电池负极层间距

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盘羊脐带间充质干细胞的分离培养及诱导分化

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中国畜牧兽医 2021年第5期48卷 1584-1592页

作者：周桂珍周正娜唐小云毕佳颖王旭光李娟新疆农业大学动物科学学院乌鲁木齐830052 南京农业大学动物科技学院南京210095

试验旨在研究野生盘羊脐带间充质干细胞(umbilical cord mesenchymal stem cells,UC-MSCs)的分离、培养及体外多向分化潜能等生物学特性。取盘羊分娩后的新生雄性胎儿脐带,采用组织块培养法分离盘羊UC-MSCs后进行体外培养,并对UC-MSCs... 详细信息

试验旨在研究野生盘羊脐带间充质干细胞(umbilical cord mesenchymal stem cells,UC-MSCs)的分离、培养及体外多向分化潜能等生物学特性。取盘羊分娩后的新生雄性胎儿脐带,采用组织块培养法分离盘羊UC-MSCs后进行体外培养,并对UC-MSCs进行成骨、成软骨和成脂诱导分化,检测其多向分化潜能。结果显示,应用组织块培养法获得的盘羊UC-MSCs具有UC-MSCs特有的呈簇、成纤维状的特性,细胞呈“S”型曲线生长,细胞的倍增时间平均为33.50 h,且可以向成骨细胞、成软骨细胞和成脂细胞分化。诱导分化特异性染色结果表明,野生盘羊UC-MSCs经诱导后的成骨细胞经茜素红S染色呈现典型的橙红色钙沉积物聚集,成软骨细胞经阿利新蓝染色呈现蓝色的软骨基质,成脂细胞经油红O染色呈现深红色的脂滴。实时荧光定量PCR检测结果发现,随着诱导时间的延长,成骨分化的细胞中骨内γ-羧基谷氨酸蛋白(BGLAP)、骨桥蛋白基因(OPN)、Runt相关转录因子2(RUNX2)基因的相对表达量极显著升高(P<0.01);成软骨分化的细胞中光蛋白聚糖(LUM)基因的表达量明显增加,而双糖链蛋白多糖(BGN)和Y染色体性别决定区基因盒9(SOX9)基因表达量极显著提高(P<0.01);成脂分化的细胞中脂蛋白酶(LPL)和过氧化物酶体增殖因子活化受体γ(PPAR-γ)基因的相对表达量极显著上升(P<0.01)。试验结果表明,用盘羊胎盘附带的脐带组织可以分离到盘羊UC-MSCs,且分离到的UC-MSCs具有分化为成骨细胞、成软骨细胞及成脂细胞等多向分化潜能。

关键词：盘羊脐带间充质干细胞分离培养体外诱导分化

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Synergistic effect of V_(2)O_(5)and bi_(2)O_(3) on the grain boundary structure of high-frequency NiCuZn ferrite ceramics

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Journal of Advanced Ceramics 2022年第6期11卷 912-921页

作者： Xiuyuan FAN Guohua BAI Zhenhua ZHANG Qiming CHEN jiaying JINa Jiafeng XUa Xuefeng ZHANG Mi YAN School of Materials Science and Engineering State Key Laboratory of Silicon MaterialsKey Laboratory of Novel Materials for Information Technology of Zhejiang ProvinceZhejiang UniversityHangzhou 310027China Institute of Advanced Magnetic Materials College of Materials&Environmental EngineeringHangzhou Dianzi UniversityHangzhou 310012China

High-frequency soft magnetic ferrite ceramics are desired in miniaturized and efficient power electronics but remain extremely challenging to deploy on account of the power loss(Pcv)at megahertz ***,we prepared NiCuZn ferrite with superior high-frequency properties by V_(2)O_(5)and bi_(2)O_(3)synergistic doping,which proves to be a potent pathway to reduce Pcv of the ferrite at megahertz *** sample doped with 800 ppm V_(2)O_(5)and 800 ppm bi_(2)O_(3)yielded the most optimized magnetic properties with a Pcv of 113 kW/m^(3)(10 MHz,5 mT,25℃),an initial permeability(μi)of 89,and a saturation induction(Bs)of 340 mT,which is at the forefront of the reported *** outstanding properties are closely related to the notable grain boundary structure,which features a new type of nano-bi_(2)Fe_(4)O_(9)phase around ferrite grains and a Ca/Si/V/O amorphous *** results indicate great strides in correlating the grain boundary structure with multiple-ion doping and set the scene for the developing high-frequency soft magnet ferrites.

关键词： NiCuZn ferrite megahertz application grain boundary bi_(2)Fe_(4)O_(9) ion doping

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Insight into the critical factors determining the particle number concentrations during summer at a megacity in China

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Journal of Environmental Sciences 2019年第1期31卷 169-180页

作者： Baoshuang Liu Xiaohui bi jiaying Zhang Jie Yuan Zhimei Xiao Qili Dai Yinchang Feng Yufen Zhang State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control & Center for Urban Transport Emission Research College of Environmental Science and EngineeringNankai University Tianjin Environmental Monitoring Center

To identify the critical factors impacting the number concentration of particles with the aerodynamic diameters less than 2.5 μm(PNC_(2.5)), the continuous measurement of PNC_(2.5),chemical components in PM_(2.5), gaseous pollutants and meteorological conditions were conducted at an urban site in Tianjin in June 2015. Results indicated that the average PNC_(2.5) was 2839 ± 2430 d N/dlog Dp 1/cm^3 during the campaign. Compared to other meteorological parameters, the relative humidity(RH) had the strongest relationship with PNC_(2.5), with a Pearson's correlation coefficient of 0.53, and RH larger than 30% influenced strongly PNC_(2.5).The important influence of secondary reactions on PNC_(2.5) was inferred due to higher correlation coefficients between PNC_(2.5) and SO_4^(2-), NO_3^-, NH_4^+(r = 0.78–0.89; p < 0.01) and between PNC_(2.5) and ratios that represent the conversion of nitrogen and sulfur oxides to particulate matter(r = 0.42–0.49; p < 0.01). Under specific RH conditions, there were even stronger correlations between PNC_(2.5) and NO_3^-, SO_4^(2-), NH_4^+, while those between PNC_(2.5) and EC, OC were relatively weak, especially when RH exceeded 50%. Principal component analysis(PCA) and Pearson's correlation analysis indicated that secondary sources, vehicle emission and coal combustion might be major contributors to PNC_(2.5). Backward trajectory and potential source contribution function(PSCF) analysis suggested that the transport of air masses originated from these regions around Tianjin(Liaoning, Hebei, Shandong and Jiangsu) influenced critically PNC_(2.5). The north of Jiangsu, the west of Shandong, and the east of Hebei were distinguished as major potential source-areas of PNC_(2.5) by PSCF model.

关键词： Particle number concentration Correlation analysis Emission sources PSCF

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以上海中医药大学附属岳阳中西医结合医院为例探析中医医院医疗质量评价指标

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国际中医中药杂志 2024年第2期46卷 156-161页

作者：施扬王景潇杭斐赵震宇唐佳颖汤杰上海中医药大学附属岳阳中西医结合医院医务处上海200437

分析中医医院医疗质量的评价指标, 实现对中医医院医疗质量进行客观公正、精准的评价。通过分析中医医院医疗质量相关文献和专题小组讨论, 总结出21个三级中医医院医疗质量评价指标。采用专家咨询法进行问卷调查, 问卷调查40名专家, 有... 详细信息

分析中医医院医疗质量的评价指标, 实现对中医医院医疗质量进行客观公正、精准的评价。通过分析中医医院医疗质量相关文献和专题小组讨论, 总结出21个三级中医医院医疗质量评价指标。采用专家咨询法进行问卷调查, 问卷调查40名专家, 有效回收37份, 积极系数为92.50%;经2轮专家咨询, 确定评价指标为:门诊中医中药饮片使用强度(中药饮片使用率、中药饮片处方数、中药饮片剂量、中药饮片服务价格)、中医医疗技术使用强度(中医技术比例、中医技术项目数、中医技术费用、中医技术疗程)指标。利用上海中医药大学附属岳阳中西医结合医院运营决策支持系统(bi)平台对10个科室相关数据进行案例分析, 发现10个科室数据分析结果与医院实际医疗质量情况基本一致。表明确定的中医医院医疗质量评价指标可反映实际医疗质量情况, 具有一定的科学性、可行性和适用性, 为完善中医医院医疗质量评价指标提供参考。

关键词：中医医院医疗质量评价指标运营决策支持系统平台

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微波辅助sol-gel法合成bi_(0.5)Na_(0.5)TiO_(3)粉体及其压电性能研究

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宁夏大学学报（自然科学版） 2024年第2期45卷 218-224页

作者：武家莹刘佳胡月房国丽郭小雷范玉杰北方民族大学材料科学与工程学院宁夏银川750021 宁夏坤达自动化科技有限公司宁夏银川750021

采用微波辅助溶胶-凝胶(sol-gel)法制备bi_(0.5)Na_(0.5)TiO_(3)(BNT)粉体,通过DSC/TG,XRD,SEM,FT-IR等表征方法,分析BNT的反应历程,煅烧温度对BNT成分、晶粒尺寸和压电性能的影响.结果表明,当微波煅烧温度为650℃时,可合成出高纯度BNT... 详细信息

采用微波辅助溶胶-凝胶(sol-gel)法制备bi_(0.5)Na_(0.5)TiO_(3)(BNT)粉体,通过DSC/TG,XRD,SEM,FT-IR等表征方法,分析BNT的反应历程,煅烧温度对BNT成分、晶粒尺寸和压电性能的影响.结果表明,当微波煅烧温度为650℃时,可合成出高纯度BNT粉体(30~120 nm),其居里温度为394℃,d_(33)=7.5 pC/N,ε_(r)=535.58,tanδ=0.29.对比传统马弗炉煅烧sol-gel法,微波辅助sol-gel法有利于提高BNT的介电性能和居里温度,降低介质损耗.

关键词：钛酸铋钠溶胶-凝胶(sol-gel)法微波烧结介电损耗压电性能

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Green‑Solvent Processed Blade‑Coating Organic Solar Cells with an Efficiency Approaching 19%Enabled by Alkyl‑Tailored Acceptors

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Nano-Micro Letters 2023年第12期15卷 449-462页

作者： Hairui Bai Ruijie Ma Wenyan Su Top Archie Dela Pea Tengfei Li Lingxiao Tang Jie Yang bin Hu Yilin Wang Zhaozhao bi Yueling Su Qi Wei Qiang Wu Yuwei Duan Yuxiang Li jiaying Wu Zicheng Ding Xunfan Liao Yinjuan Huang Chao Gao Guanghao Lu Mingjie Li Weiguo Zhu Gang Li Qunping Fan Wei Ma State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049People’s Republic of China Jiangsu Engineering Research Center of Light‑Electricity‑Heat Energy‑Converting Materials and Applications School of Materials Science and EngineeringChangzhou UniversityChangzhou 213164People’s Republic of China Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education/National Engineering Research Center for Carbohydrate Synthesis Jiangxi Normal University99 Ziyang AvenueNanchang 330022People’s Republic of China Department of Electronic and Information Engineering Research Institute for Smart Energy(RISE)The Hong Kong Polytechnic UniversityKowloon 999077Hong KongPeople’s Republic of China School of Materials Science and Engineering Xi’an University of Science and TechnologyXi’an 710054People’s Republic of China Department of Applied Physics The Hong Kong Polytechnic UniversityKowloon 999077Hong KongPeople’s Republic of China Advanced Materials Thrust Function HubThe Hong Kong University of Science and TechnologyNanshaGuangzhouPeople’s Republic of China School of Chemistry and Chemical Engineering Beijing Institute of TechnologyBeijing 100081People’s Republic of China Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710119People’s Republic of China Frontier Institute of Science and Technology Xi’an Jiaotong UniversityXi’an 710054People’s Republic of China Xi’an Key Laboratory of Liquid Crystal and Organic Photovoltaic Materials State Key Laboratory of Fluorine&Nitrogen ChemicalsXi’an Modern Chemistry Research InstituteXi’an 710065People’s Republic of China

Power-conversion-efficiencies(PCEs)of organic solar cells(OSCs)in laboratory,normally processed by spin-coating technology with toxic halogenated solvents,have reached over 19%.However,there is usually a marked PCE drop when the bladecoating and/or green-solvents toward large-scale printing are used instead,which hampers the practical development of ***,a new series of N-alkyl-tailored small molecule acceptors named YR-SeNF with a same molecular main backbone are developed by combining selenium-fused central-core and naphthalene-fused *** to the N-alkyl engineering,NIR-absorbing YR-SeNF series show different crystallinity,packing patterns,and miscibility with polymeric *** studies exhibit that the molecular packing,crystallinity,and vertical distribution of active layer morphologies are well optimized by introducing newly designed guest acceptor associated with tailored N-alkyl chains,providing the improved charge transfer dynamics and stability for the PM6:L8-BO:YRSeNF-based *** a result,a record-high PCE approaching 19%is achieved in the blade-coating OSCs fabricated from a greensolvent o-xylene with high-boiling ***,ternary OSCs offer robust operating stability under maximum-power-point tracking and well-keep>80%of the initial PCEs for even over 400 *** alkyl-tailored guest acceptor strategy provides a unique approach to develop green-solvent and blade-coating processed high-efficiency and operating stable OSCs,which paves a way for industrial development.

关键词： Alkyl-tailored guest acceptors Blade-coating Green solvent processing Stability Organic solar cells

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