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Study on phase diagrams and properties of solutions in ternary systems li+,K+(Mg2+)/SO42--H2O at 25℃

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Chinese Journal of Chemistry 1995年第2期13卷 112-117页

作者： li,Bing li, Jun FANG, Chun-Hui WANG, Qing-Zhong SONG, Peng-ShengQinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, Qinghai 810008, China SU.EDU Qinghai Institute of Salt Lakes Chinese Academy of Sciences Xining Qinghai 810008 China

Solubilities of ternary systems li+,K+/SO42--H2O (1) and li+,Mg2+/SO42-H2O (2) were investigated by isothermal method at 25℃. Physico-chemical properties of solutions, such as density, refractive index, viscosity, conductivity and pH, were determined. Phase diagram of the system (1) consists of three solubility branches and three crystallization fields corresponding to K2SO4, li2SO4.H2O and liKSO4. liKSO4 is an incongruent compound, and its transition point is estimated graphically to be 45.5-46.0℃. No solid solution of liKSO4 with li2SO4.H2O was found in the system. The system (2) is a simple eutonic type. Pitzer model of electrolyte solution was used to check the obtained solubilities. Data comparison gives good agreement. Two equations were used to correlate density, refractive index of the solution with its composition. Differences between measured and calculated values are less than 0.6% for density, 0.15% for the latter.

关键词： Salt-water system solubility of li salt phase diagram.

Regulating li transport in li-magnesium alloy for dendrite free li metal anode

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Nano Research 2023年第6期16卷 8338-8344页

作者： Jinxi Wang Yadong Ye Hongmin Zhou Wei Zhang Zhaowei Sun Jiawen Zhu Hongchang Jin Huanyu Xie Haoliang Huang Yi Cui Rong Huang Zezhong li Song Jin Hengxing Ji Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Materials for Energy ConversionDepartment of Applied ChemistryUniversity of Science and Technology of ChinaHefei 230026China Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory for Physical Sciences at the Microscale and Anhui Laboratory of Advanced Photon Science and Technology University of Science and Technology of ChinaHefei 230026China Vacuum Interconnected Nanotech Workstation(NANO-X) Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Suzhou 215123China School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China

li metal has become a strong candidate for anode due to its high theoretical specific capacity and lowest electrochemical ***,the poor reversibility caused by continuous chemical and electrochemical degradation hinders the practical application of li ***-solution-based metal alloy phases have been proposed as hosts for regulating the non-dendrite electrodeposition,but the fundamental understanding remains unclear due to the drastically different deposition behaviors of li on *** we found the difference in the diffusion coefficient of li atoms on solid-solution-based metal alloy phases(li-Mg and li-Ag alloys)was a major contributor to the different deposition *** low li atom diffusion coefficient of li-Mg alloy showed a preferential li accumulation on the upper surface rather than the inward-growth plating of li atoms into alloy foil in li-Ag *** the process of secondary recrystallization,we improved the diffusion coefficient of li atoms in li-Mg alloy that facilitates the inward transfer rather than surface plating of li *** this case,the recrystallized li-Mg alloy underwent a solidsolution phase change in the delithiation-lithiation cycles which yielded a high Coulombic efficiency of 99.3%with a reversible gravimetric capacity of 2,874 mAh·g−1 and superior cycling stability over 5,000 h without dendrite growth.

关键词： li-Mg alloy solid solution recrystallization lithium metal anode diffusion coefficient

LaF_3表面修饰li[li_(0.2)Mn_(0.54)Ni_(0.13)Co_(0.13)]O_2的制备及其电化学性能

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材料研究学报 2017年第5期31卷 394-400页

作者：李成冬姚志垒李举徐进熊新盐城工学院汽车工程学院盐城224051 江苏苏美达集团有限公司南京210018

分别以Na_2CO_3和NH_3·H_2O为沉淀剂和络合剂,用共沉淀法和950℃高温烧结制备li[li_(0.2)Mn_(0.54)Ni_(0.13)Co_(0.13)]O_2,并用湿化学法将LaF_3包覆在li[li_(0.2)Mn_(0.54)Ni_(0.13)Co_(0.13)]O_2正极材料表层。用XRD,SEM,TEM等手段表征了LaF_3包覆前后li[li_(0.2)Mn_(0.54)Ni_(0.13)Co_(0.13)]O_2颗粒的微观结构和表面形貌,用电化学测试仪检测样品的充放电性能。结果表明,包覆前后材料的结构没有变化,已经成功地将LaF_3包覆在li[li_(0.2)Mn_(0.54)Ni_(0.13)Co_(0.13)]O_2表面;LaF_3包覆使li[li_(0.2)Mn_(0.54)Ni_(0.13)Co_(0.13)]O_2的电化学综合性能明显提高。在5C高倍率下,LaF_3-li[li_(0.2)Mn_(0.54)Ni_(0.13)Co_(0.13)]O_2的放电比容量比原始li[li_(0.2)Mn_(0.54)Ni_(0.13)Co_(0.13)]O_2超过了20.3 mAh·g^(-1)。经过100次循环后LaF_3-li[li_(0.2)Mn_(0.54)Ni_(0.13)Co_(0.13)]O_2的容量保持率高达94.8%,循环稳定性更佳。这些结果表明,LaF_3包覆改性是提高li[li_(0.2)Mn_(0.54)Ni_(0.13)Co_(0.13)]O_2电化学性能切实可行的方法。

关键词：材料合成与加工工艺锂离子电池共沉淀法 li[li0.2Mn0.54Ni0.13Co0.13]O2 LaF3

FeF_3表面包覆li[li_(0.2)Mn_(0.54)Ni_(0.13)Co_(0.13)]O_2正极材料的制备和电化学性能

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高校化学工程学报 2017年第3期31卷 693-700页

作者：李成冬徐进李举夏基胜刘玮盐城工学院汽车工程学院车辆工程系江苏盐城224051 江苏苏美达集团有限公司江苏南京210018

采用典型的湿化学法制备了2%(wt)FeF_3包覆的li[li_(0.2)Mn_(0.54)Ni_(0.13)Co_(0.13)]O_2材料,并且通过XRD,SEM及TEM等技术来分析材料的微观结构和形貌。结果显示,在li[li_(0.2)Mn_(0.54)Ni_(0.13)Co_(0.13)]O_2材料表面包覆着一层5~20 nm厚的FeF_3薄膜。通过电化学性能测试发现,2%(wt)FeF_3@li[li_(0.2)Mn_(0.54)Ni_(0.13)Co_(0.13)]O_2样品的首次库伦效率更高,高倍率性能更佳,循环性能更加稳定。在0.5C倍率下循环100次后,其容量保持率仍有94.2%,放电比容量为190.6 m Ah×g^(-1)。同时电化学阻抗结果表明,FeF_3包覆层能够抑制li[li_(0.2)Mn_(0.54)Ni_(0.13)Co_(0.13)]O_2和电解液之间的副反应,稳定材料的层状结构。

关键词：富锂锰基正极材料三氟化铁表面包覆电化学性能

Electrochemical performance of liFePO_4 cathode material for li-ion battery

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Rare Metals 2006年第z1期25卷 62-66页

作者： li Shuzhong li Chao FAN Yanliang XU Jiaqiang WANG Tao YANG Shuting Engineering Research Centre for New Power Source Materials of Henan Province Xinxiang 453002 China Engineering Research Centre for New Power Source Materials of Henan Province Xinxiang 453002 China Department of Applied Chemistry College of Material Science and Chemical Engineering Zhengzhou Institute of Light Industry Zhengzhou 450002 China Department of Applied Chemistry College of Material Science and Chemical Engineering Zhengzhou Institute of Light Industry Zhengzhou 450002 China Department of Applied Chemistry College of Material Science and Chemical Engineering Zhengzhou Institute of Light Industry Zhengzhou 450002 China Engineering Research Centre for New Power Source Materials of Henan Province Xinxiang 453002 China Department of Chemical Engineering College of Chemistry and Environmental Science Henan Normal University Xinxiang 453007 China

In the search for improved materials for rechargeable lithium batteries, liFePO4 offers interesting possibilities because of its low raw materials cost, environmental friendliness and safety. The main drawback with using the material is its poor electronic conductivity and this limitation has to be overcome. Here Al-doped liFePO4/C composite cathode materials were prepared by a polymer-network synthesis technique. Testing of X-ray diffraction, charge-discharge, and cyclic voltammetry were carried out for its performance. Results show that Al-doped liFePO4/C composite cathode materials have a high initial capacity, good cycle stability and excellent low temperature performance. The electrical conductivity of liFePO4 material can be obviously improved by doping Al. The better electrochemical performances of Al-doped liFePO4/C composite cathode materials have a connection with its conductivity.

关键词： lithium ion batteries liFePO4 doping electrochemical performance

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内置应变传感器对沥青混合料力学性能的影响

工程科学学报 2025年第1期47卷 179-194页

作者：柳力李理刘朝晖傅顺发李文博潘厚璇长沙理工大学交通运输工程学院长沙410114 深圳高速工程检测有限公司深圳518000

道路本体结构的智能智慧是道路工程发展的重要方向,内置应变传感器是实现路面结构应变感知的重要手段,为探究内置应变传感器对沥青混合料力学性能影响,运用离散元法,构建了内置应变传感器的沥青混合料细观模型,研究了应变传感器埋设深... 详细信息

道路本体结构的智能智慧是道路工程发展的重要方向,内置应变传感器是实现路面结构应变感知的重要手段,为探究内置应变传感器对沥青混合料力学性能影响,运用离散元法,构建了内置应变传感器的沥青混合料细观模型,研究了应变传感器埋设深度和数量对沥青混合料力学性能影响,分析了沥青混合料材料公称最大粒径、级配和沥青砂浆黏结强度等对内置应变传感器工作性能影响.结果表明:随着传感器埋设深度的增加,梁试件底部三个监测点位处水平拉应力分别增加56.9%、43.5%、43.8%,越接近梁试件底部,其内部水平应力场分布更均匀;与单传感器相比,埋设双传感器的梁试件裂隙增加速度更快,在挠度为0.8 mm时裂隙数便达到267个,单传感器仅为93个;沥青混合料公称最大粒径越大,力链数越少,AC-16、AC-20的平均力链比较AC-13分别降低4.9%、11.4%;沥青混合料级配越粗,荷载传递路径越少,接触力系数量减少77.7%,接触力分布均匀性降低,最大接触力增加74.6%,导致传感器工作稳定性越差;沥青砂浆黏结强度增加,最大接触力下降11%,传感器工作稳定性越好.研究结果可为提升内置应变传感器的沥青混合料耐久性和工作稳定性提供参考.

关键词：道路工程沥青路面力学响应应变传感器离散元方法服役性能

Manipulating metal-sulfur interactions for achieving high-performance S cathodes for room temperature li/Na-sulfur batteries

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Carbon Energy 2021年第2期3卷 253-270页

作者： Ying-Ying Dai Chun-Mei Xu Xiao-Hao liu Xiang-Xi He Zhuo Yang Wei-Hong Lai li li Yun Qiao Shu-Lei Chou School of Environmental and Chemical Engineering Shanghai UniversityShanghaiChina Institute for Superconducting&Electronic Materials Innovation CampusUniversity of WollongongWollongongNew South WalesAustralia

Rechargeable lithium/sodium-sulfur batteries working at room temperature(RT-li/S,RT-Na/S)appear to be a promising energy storage system in terms of high theoretical energy density,low cost,and abundant resources in *** are,thus,considered as highly attractive candidates for future application in energy storage ***,the solubility of sulfur species,sluggish kinetics of lithium/sodium sulfide compounds,and high reactivity of metallic anodes render these cells *** a consequence,metal-sulfur batteries present low reversible capacity and quick capacity loss,which hinder their practical *** to address these issues regarding S cathodes are critical to the increase of their performance and our fundamental understanding of RT-li/S and RT-Na/S battery ***-sulfur interactions,recently,have attracted considerable attention,and there have been new insights on pathways to high‐performance RT-li/Na sulfur batteries,due to the following factors:(1)deliberate construction of metal-sulfur interactions can enable a leap in capacity;(2)metal-sulfur interactions can confine S species,as well as sodium sulfide compounds,to stop shuttle effects;(3)traces of metal species can help to encapsulate a high loading mass of sulfur with high‐cost efficiency;and(4)metal components make electrodes more *** this review,we highlight the latest progress in sulfide immobilization via constructing metal bonding between various metals and S ***,we summarize the storage mechanisms of li/Na as well as the metal-sulfur interaction ***,the current challenges and future remedies in terms of intact confinement and optimization of the electrochemical performance of RT-li/Na sulfur systems are discussed in this review.

关键词： electrochemical mechanism metal-sulfur interactions room temperature li/Na sulfur batteries S-confinement strategy

Effect of Y on microstructure evolution and mechanical properties of Mg−4li−3Al alloys

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Transactions of Nonferrous Metals Society of China 2021年第12期31卷 3691-3702页

作者： li-li CHANG Jing GUO Xiao-jing SU School of Materials Science and Engineering Shandong UniversityJi’nan 250061China

To obtain magnesium alloys with a low density and improved mechanical properties,Y element was added into Mg−4li−3Al(wt.%)alloys,and the effect of Y content on microstructure evolution and mechanical properties was investigated by using optical microscopy,scanning electron microscopy and tensile *** results show that mechanical properties of as-cast Mg−4li−3Al alloys with Y addition are significantly improved as a result of hot *** best comprehensive mechanical properties are obtained in hot-extruded Mg−4li−3Al−1.5Y alloy,which possesses high ultimate tensile strength(UTS=248 MPa)and elongation(δ=27%).The improvement of mechanical properties of hot-extruded Mg−4li−3Al−1.5Y alloy was mainly attributed to combined effects of grain refinement,solid solution strengthening and precipitation strengthening.

关键词： Mg−li−Al alloy Y element microstructure ultimate tensile strength elongation

Enhancement of mechanical properties of duplex Mg-9li-3Al alloy by Sn and Y addition

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Transactions of Nonferrous Metals Society of China 2018年第1期28卷 30-35页

作者： li-li CHANG Chun-chang SHI Hong-wei CUI School of Materials Science and Engineering Shandong University Ji’nan 250061 China School of Materials Science and Engineering Shandong University of Technology Zibo 255000 China

For enhancement of mechanical properties in Mg-9li-3Al alloys,Mg-9li-3Al duplex alloys were alloyed by addition of Sn and *** evolution and mechanical property response of as-cast Mg-9li-3Al alloys by alloying with Sn and Y were investigated by optical microscopy,scanning electron microscopy,X-ray diffractometry and tensile *** results indicate that considerable blocky dendrites of primaryαphase in Mg-9li-3Al alloys become lath-like due to the addition of *** addition of Y,Mg-9li-3Al alloy consists of both block-like and lath-likeα-Mg *** as-cast Mg-9li-3Al-1Sn-1Y alloy shows a yield strength of118MPa,ultimate tensile strength of148MPa and the elongation to failure of21%.Improvement in both strength and elongation of Mg-9li-3Al alloys with Sn and Y addition is attributed to the combined action of Mgli2Sn and Al2Y intermetallic compounds.

关键词： Mg-li alloys grain structure tensile properties precipitation strengthening