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锂离子电池高镍正极材料的制备及性能优化

化工进展 2024年第3期43卷 1387-1394页

作者：吴剑扬申兰耀于永利王汝娜蒋宁杨新河邱景义周恒辉北京大学化学与分子工程学院北京100871 北京泰丰先行新能源科技有限公司北京102200 防化研究院北京102205

高镍三元正极材料具有很高的理论容量,可被用于提高锂离子电池体系的能量。目前研究较多的高镍材料是镍摩尔分数在三元素中占比为80%的LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2),但是为了追求更高的能量密度,具有更高镍摩尔分数(镍摩尔分数>88%... 详细信息

高镍三元正极材料具有很高的理论容量,可被用于提高锂离子电池体系的能量。目前研究较多的高镍材料是镍摩尔分数在三元素中占比为80%的LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2),但是为了追求更高的能量密度,具有更高镍摩尔分数(镍摩尔分数>88%)的超高镍材料也需要被研究。然而,镍含量的提升对材料结构稳定性造成的负面影响阻碍了高镍材料的实际应用。因此,优化高镍材料的制备工艺十分重要。本工作首先制备了镍摩尔分数为88%、90%、92%、94%以及98%的超高镍材料,探究了它们的基本物理化学性质与电化学性能,验证了镍摩尔分数提升对于材料容量和结构稳定性带来的影响。进一步地,本工作选取了镍摩尔分数为90%的高镍材料(Ni90),着重探究了烧结温度对其性质的影响,发现Ni90材料颗粒会随着烧结温度的上升而增大,而在750℃的适宜烧结温度下,材料能在结构和颗粒尺寸上达到平衡,得到倍率和循环综合性能最好的Ni90材料。同时,对于不同镍含量的材料,也需要选择适中的温度进行烧结,才能兼顾材料的性能与稳定性。

关键词：电化学制备高镍材料正极锂离子电池

Mechanical properties and enhancement mechanisms of titanium-graphene nanocomposites

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Acta Mechanica Sinica 2020年第4期36卷 855-865页

作者： Wanhong Tang Jie Zhang jianyang wu Jinyou Shao Peng Ding Guozhen Hou Xiaoming Chen Micro-and Nanotechnology Research Center State Key Laboratory for Manufacturing Systems EngineeringXi'an Jiaotong UniversityXi'an 710049China Electronic Materials Research Lab Key Lab of the Ministry of EducationXi’an Jiaotong UniversityXi’an 710049China Department of Physics Jiujiang Research Institute and Research Institute for Biomimetics and Soft MatterFujian Provincial Key Laboratory for Soft Functional Materials ResearchXiamen UniversityXiamen 361005China

Molecular dynamics(MD)simulations of the titanium-graphene nanocomposites(TiGNCs)under uniaxial tension are carried out to investigate the mechanical properties and reinforcement mechanism of graphene in *** is found that introduction of mechanically robust graphene limits the strain-induced dislocation and araorphization and thereby highly improves the mechanical properties of metallic titanium that are greatly affected by the crystal stacking orientation of graphene and titanium *** thickness of titanium layers,interface interaction and working temperature play an important role in the mechanical strength and elastic moduli of *** results show the mechanical properties of TiGNCs are monotonically enhanced with reduction of the titanium layer thickness and working temperature,and the Young5s modulus obtained by MD simulation are higher than that predicted by the rule of mixture(ROM)due to consideration of interfacial interaction in computational *** addition,once the critical thickness of titanium layer is reached,graphene wrinkles are induced in composites because of Poisson's effect induced large lateral compression stress in the interface *** study provides helpful insights into fundamental understanding reinforcing mechanism of graphene and ultimately contribute to the optimal design and performance of mechanically robust graphene-based metallic composites.

关键词： Mechanical properties Enhancement mechanisms Titanium-graphene composites Wrinkling Molecular dynamics

Fracture mechanics of methane clathrate hydrates

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Acta Mechanica Sinica 2021年第9期37卷 1387-1394,I0002页

作者： Jinjie Liu Ke Xu Li Yang Yanwen Lin Tong Li Xuezheng Gao Zhisen Zhang jianyang wu Department of Physics Research Institute for Biomimetics and Soft MatterJiujiang Research Institute and Fujian Provincial Key Laboratory for Soft Functional Materials ResearchXiamen UniversityXiamen361005China Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo315201China

Fundamental mechanics of gas hydrates is of importance to evaluating geomechanical and geotechnical properties of gas hydrate deposits,but it remains largely unexplored yet due to insufficient direct experimental techniques and high-quality of gas hydrate ***,classic molecular dynamic(MD)simulations are used to study the fracture mechanics of three main methane clathrate hydrates of sI,sII and sH *** results show that the mechanical properties of those three methane clathrate hydrates are intrinsically different and are degraded by the presence of *** show brittle facture and different fracture *** terms of energy release rate,they are ranked as sH>sI>***,the three methane clathrate hydrates with nanocracks can be explained by a modified Griffith ***,it is intriguingly identified tip amorphization during the crack propagation process of the three methane clathrate hydrates,and sH methane clathrate hydrate with specific nanocrack exhibits slower crack propagation than other two methane clathrate hydrates.

关键词： Methane clathrate hydrates Young’s modulus Fracture toughness Griffith criterion Molecular dynamics

Late Triassic sedimentary records in the northern Tethyan Himalaya:Tectonic link with Greater India

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Geoscience Frontiers 2018年第1期9卷 273-291页

作者： Huawen Cao Yong Huang Guangming Li Linkui Zhang jianyang wu Lei Dong Zuowen Dai Liu Lu Chengdu Center China Geological Survey College of Earth Sciences Chengdu University of Technology

The Upper Triassic flysch sediments(Nieru Formation and Langjiexue Group)exposed in the Eastern Tethyan Himalayan Sequence are crucial for unraveling the controversial paleogeography and paleotectonics of the Himalayan *** work reports new detrital zircon U-Pb ages and whole-rock geochemical data for clastic rocks from flysch strata in the Shannan *** mineral modal composition data suggest that these units were mainly sourced from recycled orogen *** chemical compositions of the sandstones in the strata are similar to the chemical composition of upper continental *** rocks have relatively low Chemical Index of Alteration values(with an average of 62)and Index of Compositional Variability values(0.69),indicating that they experienced weak weathering and were mainly derived from a mature *** geochemical compositions of the Upper Triassic strata are similar to those of graywackes from continental island arcs and are indicative of an acidicintermediate igneous ***,hornblende and feldspar experienced decomposition in the provenance,and the sediment became enriched in zircon and monazite during sediment *** detrital zircons in the strata feature two main age peaks at 225-275 Ma and 500-600 Ma,nearly continuous Paleoproterozoic to Neoproterozoic ages,and a broad inconspicuous cluster in the Tonian-Stenian(800-1200 Ma).The detrital zircons from the Upper Triassic sandstones in the study area lack peaks at 300-325 Ma(characteristic of the Lhasa block)and 1150-1200 Ma(characteristic of the Lhasa and West Australia blocks).Therefore,neither the Lhasa block nor the West Australia blocks likely acted as the main provenance of the Upper Triassic *** discovered Permian-Triassic basalt and mafic dikes in the Himalayas could have provided the 225-275 Ma detrital ***,Indian and Himalayan units were the main provenances of the flysch *** Tethyan Himalaya was part of the northern passive marg

关键词： Langjiexue Group Detrital zircon Upper Triassic Sedimentary provenance Tethyan Himalaya

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锂离子电池高镍正极材料前体的制备工艺

化工进展 2024年第9期43卷 5079-5085页

作者：吴剑扬王汝娜陈耀申兰耀于永利蒋宁邱景义周恒辉北京大学化学与分子工程学院北京100871 北京泰丰先行新能源科技有限公司北京102200 防化研究院北京102205

高镍三元正极材料因其高的充放电比容量(270mA·h/g),被认为是进一步提升锂离子电池能量密度的一种关键材料。高镍三元正极材料的前体通常采用共沉淀法制备,其性质对最终烧结得到的三元正极材料的性能有显著影响。在共沉淀反应制备前体... 详细信息

高镍三元正极材料因其高的充放电比容量(270mA·h/g),被认为是进一步提升锂离子电池能量密度的一种关键材料。高镍三元正极材料的前体通常采用共沉淀法制备,其性质对最终烧结得到的三元正极材料的性能有显著影响。在共沉淀反应制备前体的过程中,氨含量、pH、反应温度、固含量、搅拌速率、杂质等诸多因素共同影响着产物的物理化学性质,增加了合成特定指标三元正极材料的难度。本文探究了具有不同粒径分布,镍含量(镍在镍钴锰三元素中的摩尔分数)分别为88%、90%、92%、94%的高镍三元前体的制备工艺与基本性质。进一步地,选择镍摩尔分数为94%的前体材料,从氨含量、pH及搅拌速率三个方面探究了合成参数对前体产物的影响,发现在相对较低的氨含量、pH以及搅拌速率条件下,更容易制备得到粒径分布均匀、形貌完好的前体,并且得到的三元材料具有更高的放电容量以及首圈库仑效率。

关键词：电化学制备高镍材料正极锂离子电池工艺

Interwoven nickel(II)-dimethylglyoxime nanowires in 3D nickel foam for dendrite-free lithium deposition

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Chinese Chemical Letters 2022年第4期33卷 2165-2170页

作者： Tianyi Zhou Yanlu Mu jianyang wu Bing Zhong Chengkai Yang Qian Wang Wen Liu Henghui Zhou Peng Jiang CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Chemical Resource Engineering College of ChemistryBeijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China College of Materials Science and Engineering Fuzhou UniversityFuzhou 350108China Institute of Energy Innovation College of Materials Science and EngineeringTaiyuan University of TechnologyTaiyuan 030024China

Metal skeletons,such as Nickel Foam(NF) has attracted worldwide interests as stable host for lithium metal anode because of its high stability,large specific surface area and high ***,most metal skeletons have lithophobic surface and uneven current distribution that result in sporadic lithium nucleation and uncontrolled dendrites ***,we describe a sequential immersing strategy to generate interwoven Nickel(Ⅱ)-dimethylglyoxime(Ni-DMG) nanowires at NF to obtain composite skeleton(NDNF),which can be used as an stable host for Li metal *** Ni-DMG has proved effective to realize uniform lithium nucleation and dendrite-free lithium *** with the three dimensional(3 D) hierarchical porous structure,the composite host shows a significantly improved coulombic efficiency(CE) than pristine commercial nickel ***,the corresponding Li‖Li symmetrical cells can run more than 700 h with low voltage hysteresis 22 mV at 1.0 mA/cm^(2),and Li@NDNF‖LiFePO;full-cell exhibits a high capacity retention of 82.03% at 1.0 C during 630 *** results proved the effectiveness of metal-organic complexes in governing Li metal growth and can be employed as a new strategy for dendrite-free Li metal anode and safe Li metal batteries(LMBs).

关键词： Nickel(II)-dimethylglyoxime Nickel foam Metal-organic complex Uniform nucleation Dendrite-free

Leap of Li Metal Anodes from Coin Cells to Pouch Cells:Challenges and Progress

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Electrochemical Energy Reviews 2023年第1期6卷 39-86页

作者： Qian Wang Tiantian Lu Yuanbin Xiao jianyang wu Lixiang Guan Lifeng Hou Huayun Du Huan Wei Xiaoda Liu Chengkai Yang Yinghui Wei Henghui Zhou Yan Yu College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina Corrosion and Protection Engineering Technology Research Center of Shanxi Province Taiyuan 030024ShanxiChina Key Laboratory of Advanced Materials Technology College of Materials Science and EngineeringFuzhou UniversityFuzhou 350108FujianChina College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871China

Li metal anodes have attracted tremendous attention in the last decade because of their high theoretical capacities and low electrochemical ***,until now,there has only been limited success in improving the interfacial and structural stabilities and in realizing the highly controllable and large-scale fabrication of this emerging material;these limitations have posed great obstacles to further performing fundamental and applied studies in Li metal *** this review,we focus on summarizing the existing challenges of Li metal anodes based on the leap from coin cells to pouch cells and on outlining typical methods for designing Li metal anodes on demand;we controllably engineer their surface protection layers and structure sizes by encapsulating structured Li metal inside a variety of synthetic protection *** aim to provide a comprehensive understanding and serve as a strategic guide for designing and fabricating practicable Li metal anodes for use in pouch *** and opportunities regarding this burgeoning field are critically evaluated at the end of this review.

关键词： Li metal anode Dendrites Pouch cells Air stability Energy density

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牡丹籽油脂质体的制备与表征研究

中国食品添加剂 2024年第3期35卷 19-24页

作者：陈程闫梦茹薛守宇葛鹏辉吴建洋杨洁龚立文西安医学院西安710021

制备牡丹籽油脂质体,以增加牡丹籽油生物利用度和稳定性。采用乙醇注入-超声波法制备牡丹籽油脂质体,并用正交试验设计优化处方和工艺参数。通过荧光倒置显微镜和扫描电镜观察脂质体形态;采用Malvern激光粒度仪测量粒径、多分散系数(PDI... 详细信息

制备牡丹籽油脂质体,以增加牡丹籽油生物利用度和稳定性。采用乙醇注入-超声波法制备牡丹籽油脂质体,并用正交试验设计优化处方和工艺参数。通过荧光倒置显微镜和扫描电镜观察脂质体形态;采用Malvern激光粒度仪测量粒径、多分散系数(PDI)及Zeta电位值;紫外可见分光光度计测量其包封率;同时考察其在4℃和25℃下的稳定性和体外释药特性。结果表明,牡丹籽油脂质体的乙醇注入-超声波法最优工艺为:卵磷脂与胆固醇的质量比为5∶1,牡丹籽油与卵磷脂的质量比为1∶5,缓冲液体积为15 mL,温度为55℃,在此条件下牡丹籽油脂质体包封率达到87.16%、粒径为143.6 nm、PDI为0.217,Zeta电位为-48.3 mV;4℃储存环境中牡丹籽油脂质体的稳定性较好;体外释药结果表明该制剂12 h内累积释放率达80.27%,缓释效果良好。

关键词：牡丹籽油脂质体表征稳定性体外释药

Surface/Interface Engineering of Hierarchical MoO_(2)/MoNi_(4)@Ru/RuO_(2)Heterogeneous Nanosheet Arrays for Alkaline Water Electrolysis with Fast Kinetics

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Chinese Journal of Chemistry 2024年第2期42卷 119-128页

作者： Qiong Zhang Ruixue Zhang Yingxiu Zhao Tiantian Sun jianyang Gao Guang-Rui Xu Zexing wu Yu Yang Lei Wang Key Laboratory of Eco-chemical Engineering Key Laboratory of Optic-electric Sensing and Analytical Chemistry of Life ScienceTaishan Scholar Advantage and Characteristic Discipline Team of Eco Chemical Process and TechnologyCollege of Chemistry and Molecular EngineeringSchool of Materials Science and EngineeringQingdao University of Science and TechnologyQingdaoShandong 266042China College of Environment and Safety Engineering Qingdao University of Science and TechnologyQingdaoShandong 266042China

Realizing the hydrogen economy by water electrolysis is an attractive approach for hydrogen production,while the efficient and stable bifunctional catalysts under high current densities are the bottleneck that limits the half-cell reactions of water ***,we propose an approach of hydrothermal and thermal annealing methods for robust MoO_(2)/MoNi_(4)@Ru/RuO_(2) heterogeneous cuboid array electrocatalyst with multiplying surface-active sites by depositing a monolayer amount of *** from abundant MoO_(2)/MoNi_(4)@Ru/RuO_(2)heterointerfaces,MoO_(2)/MoNi_(4)@Ru/RuO_(2) heterogeneous cuboid array electrocatalysts effectively drive the alkaline water splitting with superior hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)*** synthesized MoO_(2)/MoNi_(4)@Ru/RuO_(2) has high HER activity,which realizes the working overpotentials of 48 mV at 50 mA·cm^(-2),further achieving overpotentials of 230 mv for industry-level 1000 mA·cm^(-2) in alkaline water ***,it also showed an enhanced OER activity than commercial RuO_(2) with a small overpotential of 280 mV at 200 mA·cm^(-2) in alkaline *** building an electrolyzer with electrodes of(-)MoO_(2)/MoNi_(4)@Ru/RuO_(2)IIMo02/MoNig@Ru/RuO_(2)(+),a cell voltage of 1.63 V and 1.75 V is just required to support the current density of 200 mA·cm^(-2) and 500 mA-cm^(-2) in alkaline water electrolysis,much lower than that of the electrolyzer of(-)Pt/CIIRuO_(2)(+).This work demonstrates that MoO_(2)/MoNig@Ru/RuO_(2) heterogeneous nanosheet arrays are promising candidates for industrial water electrolysis applications,providing a possibility for the exploration of water electrolysis with a large currentdensity.

关键词： Hierarchical heterostructure Surface engineering Bifunctional catalysts Hydrogen evolution reaction Oxygen evolution reaction Watersplitting Catalytic activity Electrocatalysis Heterogeneous catalysis