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Science Bulletin 2024年第2期69卷 209-217页

作者： Chuyang Jing Kuan Dai Dong Liu Wenran Wang libao chen Chunxiao Zhang Weifeng Wei State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China College of Materials and Chemical Engineering Hunan Institute of EngineeringXiangtan 411104China

High-voltage lithium metal batteries(LMBs)have been considered promising next-generation highenergy-density ***,commercial carbonate electrolytes can scarcely be employed in LMBs owing to their poor compatibility with metallic lithium.N,N-dimethylacrylamide(DMAA)-a crosslinkable solubilizer with a high Gutmann donor number-is employed to facilitate the dissolution of insoluble lithium nitrate(LiNO3)in carbonate-based electrolytes and to form gel polymer electrolytes(GPEs)through in situ *** Lit solvation structure of the GPEs is regulated using LiNO3 and DMAA,which suppresses the decomposition of LiPFe and facilitates the formation of an inorganic-rich solid electrolyte ***,the Coulombic efficiency(CE)of the LillCu cell assembled with a GPE increases to 98.5%at room temperature,and the high-voltage LillNCM622 cell achieves a capacity retention of 80.1%with a high CE of 99.5%after 400 *** bifunctional polymer electrolytes are anticipated to pave the way for next-generation high-voltage LMBs.

关键词： Crosslinked solubilizer Lithium nitrate Carbonate electrolytes Gel polymer electrolytes Lithium metal batteries

多元包覆石墨复合负极材料的低温电化学储锂性能研究

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储能科学与技术 2024年第7期13卷 2116-2123页

作者：肖鹏飞梅琳陈立宝中南大学粉末冶金国家重点实验室湖南长沙410083

新能源技术的快速发展对锂离子电池在极端环境的使用提出了更高的要求。目前锂离子电池的低温性能主要受限于石墨负极界面阻抗,导致锂离子的嵌入和脱嵌过程受阻。本文通过液相法将沥青衍生碳和氧化铌颗粒协同包覆在石墨颗粒表面,制备了... 详细信息

新能源技术的快速发展对锂离子电池在极端环境的使用提出了更高的要求。目前锂离子电池的低温性能主要受限于石墨负极界面阻抗,导致锂离子的嵌入和脱嵌过程受阻。本文通过液相法将沥青衍生碳和氧化铌颗粒协同包覆在石墨颗粒表面,制备了无定形碳/氧化铌多元包覆石墨复合负极材料(C/Nb-Gr)。调控复合材料制备方法和包覆比例,测试复合负极材料的常温和低温循环性能,对比不同实验方法对复合负极材料电化学储锂性能的影响。结果表明,无定形碳/氧化铌包覆石墨复合负极材料的倍率性能和低温储锂性能有所提升。在室温5C电流密度充放电时,C/Nb-Gr-10材料具有156.18 mAh/g的比容量;在-20℃条件下,C/Nb-Gr-10材料放电比容量为204.60 mAh/g,达到室温放电比容量55.7%的保持率。

关键词：石墨负极表面改性低温储能锂离子电池

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正断层错动作用下矿山法隧道受力变形机理的模型试验研究

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铁道标准设计 2024年第1期68卷 146-154页

作者：武哲书孙文昊陈峻博王天强王琦陈立保中铁第四勘察设计院集团有限公司武汉430063 水下隧道技术国家地方联合工程研究中心武汉430063 西南交通大学土木工程学院成都610031

为研究正断层错动作用下矿山法隧道的受力变形机理,以胶州湾第二海底隧道穿越沧口断裂为工程背景,采用自研的大比尺穿越断层隧道结构破坏加载试验装置,针对设置柔性连接变形缝和变形缝间距对隧道结构抗错断效果的影响,开展几何相似比为1... 详细信息

为研究正断层错动作用下矿山法隧道的受力变形机理,以胶州湾第二海底隧道穿越沧口断裂为工程背景,采用自研的大比尺穿越断层隧道结构破坏加载试验装置,针对设置柔性连接变形缝和变形缝间距对隧道结构抗错断效果的影响,开展几何相似比为1∶40的矿山法隧道穿越倾角70°的正断层错动模型试验,对错动试验过程中的隧道变形、应变分布、围岩接触压力和破坏特性等关键指标进行监测,分析获得了正断层错动作用下隧道变形和力学响应规律。研究结果表明:(1)隧道在正断层错动作用下,呈现纵向拉弯+竖向挤压的受荷模式,在下盘邻近断层面处拱顶部位和上盘邻近断层面处仰拱部位出现脱空区;(2)隧道开裂主要以纵向贯通裂缝为主,近断层面处衬砌还出现了部分斜向裂缝和环向裂缝;(3)节段间的连接形式和节段长度不会根本上改变隧道在断层错动作用下的受荷模式和变形模式,但节段间刚度越小,节段长度越小,结构对于地层强制位错的适应性就更好;(4)相比于刚性连接,节段间的柔性连接吸收了大部分地层强制位错,有效降低衬砌节段的荷载和变形,使结构趋于安全。

关键词：海底隧道矿山法隧道断层错动正断层模型试验铰接设计脱空区

Powder metallurgical 3D nickel current collectors with plasma-induced Ni3N nanocoatings enabling long-life and dendrite-free lithium metal anode

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Journal of Energy Chemistry 2022年第9期31卷 149-157,I0005页

作者： Piao Qing Zhibin Wu Yuejiao chen Fengcheng Tang Hao Yang libao chen State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083HunanChina

Building three-dimensional(3D) current collectors is a promising strategy to surmount the bottlenecks of lithium metal anodes(LMAs), but the regulation methodology of a 3D current collector has seldom been considered comprehensively concerning both skeleton architectures and surface coatings. Herein, a robust porous 3D nickel skeleton(NS) with lithiophilic NiN nanocoatings(NiN@NS) is synthesized via an integrative route of powder metallurgy/plasma-enhanced nitridation technics. The facile powder metallurgical method facilitates the adjustment of NS architectures toward sufficient electrolyte adsorption and even current density distribution, while the followed plasma-enhanced chemical vapor deposition(PECVD) method can induce compact NiN nanocoatings on NS, which reduces the Li nucleation overpotential, accelerates the Li-ion transfer, and facilitates a highly reversible oriented texture of Li deposition morphology owing to the dense and homogenous deposition of Li into the pores. The optimized NiN@NS current collector shows a high averaged Coulombic efficiency(CE) of 98.8% over 350cycles, a prolonged lifespan of 1000 h(at 2 mA cm^(-2)) in symmetrical cells, together with the significant performance in full cells. The ingenious methodology reported in this work can also be broadly applicable for the controllable production of other 3D skeletons with nitride nanocoatings for various applications.

关键词： 3D current collector Ni3N Lithium metal anode Plasma Powder metallurgy

高水压作用下衬砌管片构件氯离子侵蚀数值模拟研究

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现代隧道技术 2024年第3期61卷 131-140页

作者：陈立保封坤孙文昊邢文杰潘瑾耿珺洋王俊玲中铁第四勘察设计院集团有限公司武汉430063 西南交通大学交通隧道工程教育部重点实验室成都610031 第三代建项目部成都610031

为探究高水压作用下氯离子在管片结构中的运移与分布规律,明确外水压条件、氯离子浓度、孔隙水压力、侵蚀时间等因素对衬砌管片侵蚀规律的影响,以青岛胶州湾第二海底隧道为依托工程,采用COMSOL Multiphysics■有限元平台建立高水压作用... 详细信息

为探究高水压作用下氯离子在管片结构中的运移与分布规律,明确外水压条件、氯离子浓度、孔隙水压力、侵蚀时间等因素对衬砌管片侵蚀规律的影响,以青岛胶州湾第二海底隧道为依托工程,采用COMSOL Multiphysics■有限元平台建立高水压作用下饱和-非饱和条件衬砌管片的氯离子侵蚀运移数值模型,采用结构力学模块(solid)、桁架模块(truss)以及多孔介质稀物质传递模块(tds)和理查兹方程模块(dl)模拟管片模型构件在压弯荷载、高水压和离子浓度耦合作用下的氯离子侵蚀规律。结果表明:高水压作用下氯离子在管片构件中的对流作用主要受水头控制,而扩散作用主要受浓度梯度影响,可将氯离子浓度-深度曲线分为对流水平段、过渡段和扩散段。

关键词：海底盾构隧道管片耦合作用氯离子侵蚀高水压

In Situ Formed Tribofilms as Efficient Organic/Inorganic Hybrid Interlayers for Stabilizing Lithium Metal Anodes

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Nano-Micro Letters 2023年第12期15卷 320-333页

作者： Shaozhen Huang Kecheng Long Yuejiao chen Tuoya Naren Piao Qing Xiaobo Ji Weifeng Wei Zhibin Wu libao chen State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083People’s Republic of China College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083People’s Republic of China

The practical application of Li metal anodes(LMAs)is limited by uncontrolled dendrite growth and side ***,we propose a new friction-induced strategy to produce high-performance thin Li anode(Li@CFO).By virtue of the in situ friction reaction between fluoropolymer grease and Li strips during rolling,a robust organic/inorganic hybrid interlayer(lithiophilic LiF/LiC_(6)framework hybridized-CF_(2)-O-CF_(2)-chains)was formed atop Li *** derived interface contributes to reversible Li plating/stripping behaviors by mitigating side reactions and decreasing the solvation degree at the *** Li@CFO||Li@CFO symmetrical cell exhibits a remarkable lifespan for 5,600 h(1.0 mA cm^(-2)and 1.0 mAh cm^(-2))and 1,350 cycles even at a harsh condition(18.0 mA cm^(-2)and 3.0 mAh cm^(-2)).When paired with high-loading LiFePO4 cathodes,the full cell lasts over 450 cycles at 1C with a high-capacity retention of 99.9%.This work provides a new friction-induced strategy for producing high-performance thin LMAs.

关键词： Lithium metal anode Organic/inorganic hybrid interlayers High current density Fluoropolymer grease Local desolvation environment

Fast ion diffusion alloy layer facilitating 3D mesh substrate for dendrite-free zinc-ion hybrid capacitors

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Journal of Energy Chemistry 2022年第10期31卷 565-574,I0014页

作者： Huaming Yu Quanyu Li Wen Liu Han Wang Xuyan Ni Qiwen Zhao Weifeng Wei Xiaobo Ji Yuejiao chen libao chen State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083HunanChina College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083HunanChina

Although aqueous zinc ion hybrid capacitors have advantageous integration of batteries and supercapacitors,they still suffer from the inherent problems of dendrite growth and interfacial side reactions on Zn ***,a universal fast zinc-ion diffusion layer on a three-dimensional(3 D)mesh structure model is demonstrated to effectively improve Zn plating/stripping *** fast ion diffusion alloy layer accelerates the Zn^(2+)migration in an orderly manner to homogenize Zn^(2+)flux and overcomes the defects of the commercial mesh substrate,effectively avoiding dendrite growth and side ***,the proof-of-concept silver-zinc alloy modified stainless steel mesh delivers superb reversibility with the high coulombic efficiency over 99.4%at 4 mA cm^(-2)after 1600 cycles and excellent reliability of over 830 h at 1 mA cm^(-2),Its feasibility is also evidenced in commercial zinc ion hybrid capacitors with activated carbon as the *** work enriches the fundamental comprehension of fast zinc-ion diffusion layer combined with a 3 D substrate on the Zn deposition and opens a universal approach to design advanced host for Zn electrodes in zinc ion hybrid capacitors.

关键词： Zinc-ion hybrid capacitors 3D metal mesh Flexible electrode Fast ion diffusion Alloy layer Zinc ion kinetics

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聚合物人工固体电解质界面层的研究进展

电源技术 2024年第5期48卷 757-766页

作者：宋芊颖胡桔溏唐一帆娜仁托雅喻颖枝旷桂超陈立宝中南大学粉末冶金国家重点实验室湖南长沙410083

锂金属负极因具有极高的比容量(3860 mAh/g)和低电化学电势(-3.04 V),成为可充电电池领域的研究热点。然而,锂金属的不稳定性会促使枝晶形成,在充放电过程中发生不可控的界面反应,导致生成的固体电解质界面(solid electrolyte interphas... 详细信息

锂金属负极因具有极高的比容量(3860 mAh/g)和低电化学电势(-3.04 V),成为可充电电池领域的研究热点。然而,锂金属的不稳定性会促使枝晶形成,在充放电过程中发生不可控的界面反应,导致生成的固体电解质界面(solid electrolyte interphase,SEI)层不稳定,进而影响电池循环寿命。通过锂金属负极表面引入聚合物人工SEI(ASEI),改善机械性能和电化学性能,从而制备长循环寿命和高能量密度的锂金属电池(LMBs)。聚合物具有灵活度高及结构可设计等特点,是人工SEI的理想材料。概述了人工SEI的性质及作用,根据聚合物官能团类型和所起作用,系统总结了聚合物人工SEI的研究进展,并对未来的研究方向和发展前景作出展望。

关键词：人工固体电解质界面层聚合物锂金属电池

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3D Printing Engineered Multi-porous Cu Microelectrodes with In Situ Electro-Oxidation Growth of CuO Nanosheets for Long Cycle,High Capacity and Large Rate Supercapacitors

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Acta Metallurgica Sinica(English Letters) 2021年第1期34卷 85-97页

作者： Tao Liu Yuejiao chen libao chen State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China

Developing excellent pseudocapacitive electrodes with long cycle,high areal capacity and large rate has been challenged.3 D printing is an additive manufacture technique that has been explored to construct microelectrodes of arbitrary geometries for high-energy–density *** comparison with conventional electrodes with uncontrollable geometries and architectures,3 D-printed electrodes possess unique advantage in geometrical shape,mechanical properties,surface area,especially in ion transport and charge ***,a desirable 3 D electrode with ordered porous structures can be elaborately designed by 3 D printing technology for improving electrochemical capacitance and rate *** this work,a designed,monolithic and ordered multi-porous 3 D Cu conductive skeleton was manufactured through 3 D direct ink writing technique and coated with Cu O nanosheet arrays by an in situ electro-oxidation *** from the highly ordered multiporous nature,the 3 D-structured skeleton can eff ectively enlarge the surface area,enhance the penetration of electrolyte and facilitate fast electron and ion *** a result,the 3 D-printed Cu deposited with electro-oxidation-generated CuO(3 DP Cu@Cu O)electrodes demonstrates an ultrahigh areal capacitance of 1.690 F cm^(-2)(38.79 F cm^(-3))at a large current density of 30 m A cm^(-2)(688.59 m A cm^(-3)),excellent lifespan of 88.20%capacitance retention after 10,000 cycles at 30 m A cm^(-2) and superior rate capability(94.31%retention,2-30 m A cm^(-2)).This design concept of 3 D printing multi-porous current collector with hierarchical active materials provides a novel way to build high-performance 3 D microelectrodes.

关键词： 3D printing Supercapacitor Microelectrode Copper oxide Multi-porous current High areal specific capacitance

维生素B_(12)微囊粉的制备及稳定性研究

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现代食品 2024年第11期30卷 75-80页

作者：陈礼宝张要华赵晨宇刘风莉赵锦慧郑州瑞普生物工程有限公司河南郑州450001

以辛烯基琥珀酸淀粉钠为微囊壁材制备维生素B_(12)固体微囊粉,通过单因素试验优化制备条件,并通过储藏实验探究维生素B_(12)固体微囊粉的稳定性。结果显示,维生素B_(12)微囊粉的最佳制备条件为辛烯基琥珀酸淀粉钠占比80%、壁材溶液pH值... 详细信息

以辛烯基琥珀酸淀粉钠为微囊壁材制备维生素B_(12)固体微囊粉,通过单因素试验优化制备条件,并通过储藏实验探究维生素B_(12)固体微囊粉的稳定性。结果显示,维生素B_(12)微囊粉的最佳制备条件为辛烯基琥珀酸淀粉钠占比80%、壁材溶液pH值5~6、剪切时间11 min、均质压力30 MPa,此条件下制得的1%维生素B_(12)微囊粉有效成分含量保持在0.97%以上。在储藏的6个月内,维生素B_(12)含量无显著变化,说明维生素B_(12)微囊粉具有良好的稳定性。

关键词：辛烯基琥珀酸淀粉钠维生素B_(12) 微胶囊稳定性