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Dual-single-atoms of Pt-Co boost sulfur redox kinetics for ultrafast li-S batteries

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Carbon Energy 2024年第3期6卷 53-63页

作者： Hanyan Wu Xuejie Gao Xinyang Chen Weihan li Junjie li Lei Zhang Yang Zhao Ming Jiang Runcang Sun Xueliang Sun Center for lignocellulosic Chemistry and Biomaterials College of Light Industry and Chemical EngineeringDalian Polytechnic UniversityDalianChina Department of Mechanical and Materials Engineering University of Western OntarioLondonOntarioCanada Institute of Physical Science and Information Technology Anhui UniversityHefeiChina

Applications of lithium-sulfur(li-S)batteries are still limited by the sluggish conversion kinetics from polysulfide to li_(2)*** various single-atom catalysts are available for improving the conversion kinetics,the sulfur redox kinetics for li-S batteries is still not ***,in this work,a catalyst with dual-single-atom Pt-Co embedded in N-doped carbon nanotubes(Pt&Co@NCNT)was proposed by the atomic layer deposition method to suppress the shuttle effect and synergistically improve the interconversion kinetics from polysulfides to li_(2)*** X-ray absorption near edge curves indicated the reversible conversion of li_(2)Sx on the S/Pt&Co@NCNT ***,density functional theory demonstrated that the Pt&Co@NCNT promoted the free energy of the phase transition of sulfur species and reduced the oxidative decomposition energy of li_(2)*** a result,the batteries assembled with S/Pt&Co@NCNT electrodes exhibited a high capacity retention of 80%at 100 cycles at a current density of 1.3 mA cm^(−2)(S loading:2.5 mg cm^(−2)).More importantly,an excellent rate performance was achieved with a high capacity of 822.1 mAh g^(−1) at a high current density of 12.7 mA cm^(−2).This work opens a new direction to boost the sulfur redox kinetics for ultrafast li-S batteries.

关键词： DFT calculation dual-single-atoms of Pt-Co fast li-sulfur batteries sulfur redox kinetics XANES analysis

Boosting reversible charging of li-ion batteries at low temperatures by a synergy of propylene carbonate-based electrolyte and defective graphite

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Nano Research 2024年第3期17卷 1491-1499页

作者： Yingqiang Wu Jiao Zhang Jinli liu li Sheng Bo Zhang limin Wang Siqi Shi li Wang Hong Xu Xiangming He Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of Sciences(CAS)Changchun 130022China China National Quality Supervision and Inspection Center for Industrial Explosive Materials Nanjing University of Science and TechnologyNanjing 210094China School of Materials Science and Engineering Materials Genome InstituteShanghai UniversityShanghai 200444China

Propylene carbonate(PC)-based electrolytes have exhibited significant advantages in boosting the low-temperature discharging of graphite-based li-ion ***,it is still unclear whether they can improve the charging property and suppress lithium *** this topic is challenging due to the problem of electrochemical *** overcome this issue,we introduced graphite with phase *** results show that the pouch-type full batteries using PC-based electrolyte exhibit steady performance over 500 cycles and can be reversibly charged over 30 times at-20℃ with an average Coulombic efficiency of 99.95%,while the corresponding value for the conventional ethylene carbonate(EC)-based electrolyte sample is only 31.20%.This indicates that the use of PC-based electrolyte significantly suppresses lithium plating during low-temperature *** further demonstrate that the improved performance is mainly attributed to the unique solvation structure,where PF-6more anions participate in solvation,leading to the formation of a stable F-rich solid state electrolyte interface on the graphite surface and a lower reduction tendency of li+*** work inspires new ideas for the design of PC-based electrolytes for low-temperature charging and fast-charging batteries.

关键词： lithium-ion batteries graphite propylene carbonate low-temperature charging

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中国耕地价格的测度、格局及影响因素

中国土地科学 2022年第7期36卷 53-62页

作者：戚渊李瑶瑶朱道林张嘉庆刘立程江丽中国农业大学土地科学与技术学院北京100193 中国土地政策与法律研究中心北京100193

研究目的:揭示中国当前县域耕地价格格局及影响因素,保障国家粮食安全、乡村振兴等重大战略顺利推进。研究方法:收益还原法与经济计量模型。研究结果:(1)中国县域耕地价格整体上呈现出东高西低的阶梯型分布态势,且价格空间关联性与集聚... 详细信息

研究目的:揭示中国当前县域耕地价格格局及影响因素,保障国家粮食安全、乡村振兴等重大战略顺利推进。研究方法:收益还原法与经济计量模型。研究结果:(1)中国县域耕地价格整体上呈现出东高西低的阶梯型分布态势,且价格空间关联性与集聚特征显著;(2)县域层面,耕地质量条件是决定中国耕地价格的主导因素,经济环境对中国耕地价格的影响程度次之,外部投入与增值预期对耕地价格影响较小;(3)耕地质量等别间,耕地质量对价格影响强度随耕地等别优化而逐级减弱,经济环境对价格作用强度则随质量等别优化为逐级增强。研究结论:耕地质量条件主导耕地价格水平,但经济环境对耕地价格具有溢价效应。未来,需要完善政策工具以保障耕地生产要素属性,防范农地过度资本化。

关键词：土地经济耕地价格区县单元影响因素空间杜宾模型

Review Article li-current collector interface in lithium metal batteries

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Nano Research 2024年第10期17卷 8706-8728页

作者： Tian-Yu Wang Dingyi Zhao Keyue liang Yuzhang li Department of Chemical and Biomolecular Engineering University of CaliforniaLos AngelesLos AngelesCalifornia 90095USA

Interfaces within batteries,such as the widely studied solid electrolyte interface(SEI),profoundly influence battery *** these interfaces,the solid-solid interface between electrode materials and current collectors is crucial to battery performance but has received less discussion and *** review highlights the latest research advancements on the solid-solid interface between lithium metal(the next-generation anode)and current collectors(typically copper),focusing on factors affecting the li-current collector interface and improvement strategies from perspectives of current collector substrate(lithiophilicity,crystal facets,mechanical properties,and topological structure),electrolyte chemistry,current density,stacking pressure,SEI,electric field and temperature,and provides a future directions and opportunities on this topic.

关键词： lithium metal anode current collectors li-current collector interface solid-solid interface improvement strategies

外源p-香豆酸处理对采后桃果实苯丙烷代谢和抗氧化能力的影响

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食品科学 2019年第23期40卷 227-232页

作者：李姚瑶曹毛毛王小璐苏金龙高慧西北大学食品科学与工程学院

为探究外源p-香豆酸(p-coumaric acid,p-CA)处理对采后桃果实冷害和相关机制的影响,本实验以‘沙红’桃果实为试材,研究了0、0.5、1.0 mmol/L p-CA浸泡处理对采后桃果实于4℃贮藏期间冷害指数和丙二醛含量的影响,并得出最优浓度(0.5 mmo... 详细信息

为探究外源p-香豆酸(p-coumaric acid,p-CA)处理对采后桃果实冷害和相关机制的影响,本实验以‘沙红’桃果实为试材,研究了0、0.5、1.0 mmol/L p-CA浸泡处理对采后桃果实于4℃贮藏期间冷害指数和丙二醛含量的影响,并得出最优浓度(0.5 mmol/L),在此条件下继续研究其对桃果实苯丙烷代谢和抗氧化能力的影响。结果显示:p-CA处理延缓了桃果实冷害的发生和丙二醛的生成;p-CA处理激活了莽草酸脱氢酶、苯丙氨酸脱氨酶、肉桂酸-4-羟化酶和4-香豆酸辅酶A连接酶活力,并抑制了多酚氧化酶及过氧化氢酶活力,这使桃果实中总酚含量增加,进而提高了清除1,1-二苯基-2-三硝基苯肼自由基、羟自由基、O2-的能力。以上结果表明p-CA处理对桃果实低温贮藏期间冷害发生的延缓作用与其对苯丙烷代谢和抗氧化能力的调控有关。

关键词： p-香豆酸桃果实冷害苯丙烷代谢抗氧化能力

Process intensification for the synthesis and purification of battery-grade li_(2)CO_(3)with microfluidics

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Particuology 2024年第7期90卷 106-117页

作者： Haodu li Jie Zhang lin Dai Le Du Jiqin Zhu The State Key Laboratory of Chemical Resource Engineering College of Chemical EngineeringBeijing University of Chemical TechnologyBeijing 100029China

Battery-grade lithium carbonate(li_(2)CO_(3))with a purity of higher than 99.5 wt%is of great importance as a high value-added lithium ***,influences of different reaction systems and process control on product purity remain ***,a membrane dispersion microreactor was used to enhance the mass transfer of preparation and purification processes in homogeneous and heterogeneous *** systems of Na_(2)CO_(3)–liCl,NH_(4)HCO_(3)–liCl,and NH_(3)·H_(2)O−CO_(2)−liCl,CO_(2)purification based on carbonation and decomposition were *** li_(2)CO_(3)purity was increased by the improvement of mixing *** carbonation time was reduced by 62.5%and 58.3%for the NH_(3)·H_(2)O−CO_(2)and CO_(2)purification systems,*** the two ammonia-based systems,li_(2)CO_(3)particles with a purity of 99.7–99.8 wt%were one-step prepared with a size of 3–5μm,which also met the requirement of the battery-grade *** purity was further increased to 99.9 wt%by CO_(2)purification and liHCO_(3)*** investigation could provide a feasible alternative for the controllable preparation of battery-grade li_(2)CO_(3)in one or multiple steps.

关键词： Microfluidics Battery grade li_(2)CO_(3) Process intensification High purity

SLAM法在分析反跑道子母弹毁伤概率中的应用

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兵器材料科学与工程 2013年第3期36卷 57-59页

作者：李尧尧姜春兰杨伟苓北京理工大学爆炸科学与技术国家重点实验室北京100081 中国兵器科学研究院宁波分院冲击环境材料技术重点实验室山东烟台264003

根据军用机场跑道构造特点,在子弹药探测到机场跑道的前提下,利用反跑道子母弹的面布撒优势,结合最佳瞄准点的选择,分析统计线性化伴随法(SLAM)在子弹攻击跑道命中概率中的具体应用。结合子弹探测概率及影响子弹药撒布要素,得出子弹对... 详细信息

根据军用机场跑道构造特点,在子弹药探测到机场跑道的前提下,利用反跑道子母弹的面布撒优势,结合最佳瞄准点的选择,分析统计线性化伴随法(SLAM)在子弹攻击跑道命中概率中的具体应用。结合子弹探测概率及影响子弹药撒布要素,得出子弹对机场跑道的射击概率。SLAM法较传统分析方法可大幅提高工作效率,在反跑道子母弹总体设计和效能分析中具有一定的应用价值。

关键词：子母弹射击概率统计线性化伴随法

Enrichment of Chemical Element ^(7)li in the Rotating Red Clump Star

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Chinese Physics Letters 2024年第8期41卷 121-125页

作者： Fang-Wen Wu Han-Feng Song Qing-li li Yun He Xin-Yue Qu Zhuo Han College of Physics Guizhou UniversityGuiyang 550025China Geneva Observatory University of GenevaCH-1290 SauvernySwitzerland

About 2 percent of red clump stars are found to be the lithium-rich and thus the surface lithium increases obviously in some red clump *** physical mechanism of the lithium enrichment in these stars has not yet been explained satisfactorily by the evolutionary models of single *** flash induced internal gravity wave mixing(i.e.,IGW)could play a primary role in explaining the red clump star with lithium enrichment and it has a very significant impact on the internal structure and surface compositions of a *** can significantly increase the mixing efficiency of the internal gravity wave because the timescale for the enrichment event has been *** mixing can explain the observed behavior of lithium on red giant stars that are more luminosity than the RGB ***,it has a very small effect on the diffusion of elements because its diffusion coefficient is much smaller than the one of IGW induced mixing after the core helium flash.

关键词： flash stars lithium

体外培养中硒对黄曲霉毒素B_1损伤凡纳滨对虾肝胰腺细胞的影响

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动物营养学报 2016年第1期28卷 274-280页

作者：李赵嘉郭冉夏辉申亮解伟李垚垚王美雪河北农业大学海洋学院秦皇岛066003

本试验旨在研究体外培养中硒（Se）对凡纳滨对虾（litopenaeus vannamei）肝胰腺细胞抗氧化能力的影响以及对黄曲霉毒素B1（AFB1）毒性的缓解作用。在体外培养肝胰腺细胞的基础上,设定含不同浓度（0、0.15、0.30、0.45、0.60、0.75μg/... 详细信息

本试验旨在研究体外培养中硒（Se）对凡纳滨对虾（litopenaeus vannamei）肝胰腺细胞抗氧化能力的影响以及对黄曲霉毒素B1（AFB1）毒性的缓解作用。在体外培养肝胰腺细胞的基础上,设定含不同浓度（0、0.15、0.30、0.45、0.60、0.75μg/m L）Se的培养液,研究Se对肝胰腺细胞抗氧化能力的影响;另用浓度为1 600μg/L的AFB1侵染细胞,探究Se对AFB1毒性的缓解作用。结果表明：当Se浓度处于0-0.45μg/m L时,随着Se浓度的增加,丙二醛（MDA）含量呈现降低趋势,但各个浓度之间并没有显著差异（P〉0.05）,过氧化氢酶（CAT）、谷胱甘肽过氧化物酶（GSH-Px）活力随着Se浓度的增加而增强,Se浓度为0.45μg/m L时GSH-Px活力显著高于其他浓度（除0.30μg/m L）时（P〈0.05）;当Se浓度处于0.45-0.75μg/m L时,随着MDA含量升高的同时CAT、GSH-Px活力下降。当细胞受到浓度为1 600μg/L的AFB1侵染后,随着培养时间的增加,MDA含量表现一直升高的趋势,同时CAT、GSH-Px活力都有一定程度的下降;当细胞受到浓度为1 600μg/L的AFB1和浓度为0.45μg/m L的Se共同作用后,随着培养时间的增加,MDA含量有一定程度的改善,CAT、GSH-Px活力得到一定程度的恢复。由此可见,在体外培养条件下,浓度为0.45μg/m L的Se有利于提高凡纳滨对虾肝胰腺细胞的抗氧化能力,且在一定程度上能缓解AFB1对肝胰腺细胞的毒性作用。

关键词：硒黄曲霉毒素B1 丙二醛过氧化氢酶谷胱甘肽过氧化物酶