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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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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

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基于触头分断/闭合电流波形的电寿命预测

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低压电器 2008年第1期 14-17,21页

作者：魏梅芳李震彪阳靖吴细秀湖南省电力公司中心培训部湖南长沙410131 华中科技大学湖北武汉430074 长沙电业局湖南长沙410015 武汉理工大学湖北武汉430070

针对触头材料的寿命预测主要基于磨损量和电流的关系,提出一种新的触头材料电寿命诊断预测方法,即通过分合电路操作过程中的电弧电流的时序特征变化来预测剩余寿命。对AgSnO2,AgNi10,AgNi0.15三种触头材料进行了寿命试验,采样了电流、... 详细信息

针对触头材料的寿命预测主要基于磨损量和电流的关系,提出一种新的触头材料电寿命诊断预测方法,即通过分合电路操作过程中的电弧电流的时序特征变化来预测剩余寿命。对AgSnO2,AgNi10,AgNi0.15三种触头材料进行了寿命试验,采样了电流、电压信号并分析了分断燃弧时间、接触电阻等参数。

关键词：电触头寿命预测电流波形

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苯磺酸氨氯地平对老年冠心病患者造影剂相关肾损害的保护作用

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南方医科大学学报 2012年第11期32卷 1580-1583页

作者：惠海鹏李开亮李振彪汪晶晶高萌韩学美解放军总医院南楼心一科北京100853 解放军总后卫生部药品仪器检验所器检办北京100071 解放军总医院心内科北京100853 解放军总医院南楼急诊科北京100853

目的探讨苯磺酸氨氯地平是否对老年冠心病患者造影剂相关肾损害具有保护作用。方法本研究人选的年龄在60岁(含)以上的老年冠心病患者随机分为对照组和治疗组。两组在水化基础上,分别于应用造影剂前7d和后2d口服安慰剂或苯磺酸氨氯地平... 详细信息

目的探讨苯磺酸氨氯地平是否对老年冠心病患者造影剂相关肾损害具有保护作用。方法本研究人选的年龄在60岁(含)以上的老年冠心病患者随机分为对照组和治疗组。两组在水化基础上,分别于应用造影剂前7d和后2d口服安慰剂或苯磺酸氨氯地平。比较两组造影后24、48 h及5d时血胱抑素C、尿素氮、肌肝、肌酐清除率和尿β2微球蛋白、尿NAG酶以及造影剂肾病发生率等指标。结果无论对照组还是治疗组,应用造影剂对患者肾功能均有明显影响(P<0.05)。应用造影剂后24 h治疗组血胱抑素C、尿β2微球蛋白和尿NAG酶数值明显低于对照组:血胱抑素C[(1.32±0.40)vs(1.50±0.58),P<0.05];尿β2微球蛋白[(206±89.4)vs(237.5±88)μg/L,P<0.05];尿NAG酶[(16.8±5.5)vs(20.1±6.1)U/L,P<0.05];其余指标无明显差异。应用造影剂后48 h治疗组肾小球和肾小管功能指标均显著优于对照组:血胱抑素C[(1.11±0.45)vs(1.34±0.46),P<0.05];尿素氮[(8.2±3.2)vs(9.2±3.7)mmol/L,P<0.05];肌肝(102.6±27.7)vs(112.4±40.8)μmol/L,P<0.05;肌酐清除率(82.1±25.5)vs(71.3±44.5)μmol/L,P<0.05;尿β2微球蛋白[(234.9±108.0)vs(266.2±105.7)mmol/L,P<0.05];尿NAG酶[(20.5±4.1)vs(22.7±5.0)U/L,P<0.05]。应用造影剂后5d治疗组和对照组比较,除血胱抑素C外,其他指标仍有显著差异:尿素氮[(7.2±2.8)vs(8.1±3.0)mmol/L,P<0.05];肌肝[(86.4±26.8)vs(96.3±35.7)μmol/L,P<0.05];肌酐清除率[(94.7±31.9)vs(86.2±21.0)ml/min,P<0.05];尿β2微球蛋白[(199.1±80.9)vs(232.5±92.1)μg/L,P<0.05];尿NAG酶[(16.6±5.0)vs(20.6±6.7)U/L,P<0.05]。治疗组造影剂肾病发生率明显低于对照组:5/95 vs 10/94,P<0.05。结论苯磺酸氨氯地平对老年冠心病患者造影剂相关肾损害具有一定的预防保护作用。

关键词：老年冠心病苯磺酸氨氯地平造影剂相关肾损害

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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

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肠道菌群与胆汁酸代谢的互作关系

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动物营养学报 2018年第9期30卷 3466-3472页

作者：范哲于王进波齐莉莉李振彪浙江大学宁波理工学院宁波315100 浙江大学化学工程与生物工程学院杭州310027

肠道菌群与胆汁酸代谢密切相关,肠道细菌通过调节法尼醇受体和G蛋白偶联受体的表达影响胆汁酸的合成;肠道细菌产生的胆酸盐水解酶和类固醇脱氢酶影响胆汁酸去结合、共价修饰和异构化;肠道细菌通过影响肠黏膜胆汁酸转运载体的表达,影响... 详细信息

肠道菌群与胆汁酸代谢密切相关,肠道细菌通过调节法尼醇受体和G蛋白偶联受体的表达影响胆汁酸的合成;肠道细菌产生的胆酸盐水解酶和类固醇脱氢酶影响胆汁酸去结合、共价修饰和异构化;肠道细菌通过影响肠黏膜胆汁酸转运载体的表达,影响胆汁酸的重吸收。胆汁酸可破坏细胞膜完整性、损伤DNA或诱导蛋白质变性失活等,从而直接抑制肠道细菌;也可通过刺激肠道上皮产生一氧化氮合酶、白细胞介素等因子,间接抑制肠道细菌的生长、增殖;胆汁酸还可作为诱导物,调节致病菌毒力因子的表达。肠道菌群和胆汁酸与畜禽健康密切相关,两者通过精细复杂的互作机制,影响机体的生理机能。本文总结了肠道菌群与胆汁酸代谢的互作关系及其在调节畜禽机体健康和生产性能过程中的作用。

关键词：肠道菌群胆汁酸互作畜禽健康

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触头分合过程中的短时熔焊现象

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低压电器 2007年第23期 13-15页

作者：魏梅芳吴细秀阳靖李震彪湖南省电力公司湖南长沙410131 华中科技大学湖北武汉430074

通过对触头分合过程的电流/电压波形的分析,可以及时发现分断过程中出现的触点短时熔焊现象,有利于综合判断触头的工作可靠性和剩余寿命。且随操作次数的增加,短时熔焊现象的出现具有随机性和突发性,短时熔焊现象出现之前的分断燃弧时... 详细信息

通过对触头分合过程的电流/电压波形的分析,可以及时发现分断过程中出现的触点短时熔焊现象,有利于综合判断触头的工作可靠性和剩余寿命。且随操作次数的增加,短时熔焊现象的出现具有随机性和突发性,短时熔焊现象出现之前的分断燃弧时间基本保持不变。

关键词：触头电寿命波形分析法短时熔焊

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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

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Chemical Activation of S/li2S in li-S Batteries by a Bidirectional Organic Redox Mediator

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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES 2024年第5期40卷 927-934页

作者： li, Chengqiu Zhou, Chaoyong Mei, Shilin Yao, Changjiang Beijing Inst Technol Sch Mechatron Engn State Key Lab Explos Sci & Safety Protect Beijing 100081 Peoples R China Xian Safty Energy Technol Co Ltd Xian 710299 Peoples R China

The energy density and lifespan of prototype li-S batteries under high sulfur loading and lean electrolyte have been mainly restricted by the incomplete interconversion between insulating S8 and li2S. The introduction of an electrocatalyst has been preserved as an effective way to breakthrough the bottleneck of the interconversion rate. Herein, we demonstrate a novel bidirectional redox mediator, insoluble dithiobisphthalimide (DTPI), as the electrocatalyst for both S8 reduction and li2S oxidation. Due to the dual-functional role of both electron/li+ donor and acceptor, DTPI can efficiently accelerate the redox reactions during charge/discharge and significantly alleviate the incomplete conversion of sulfur species. Consequently, the li-S batteries with DTPI deliver superior specific capacity and cycling stability in comparison with those without DTPI. Especially, the redox mediator is scalable for synthesis and the DTPI-based 5 Ah pouch cell delivers a specific discharge capacity of around 870 mAhg(-1) at 0.1 C (1 C=1675 mA/g) without capacity fading over 80 cycles. The bidirectional catalysis mechanism has been studied through theoretical calculation and ex-situ characterization of the cathode materials. This work approves the effectiveness of bidirectional organic redox mediator in the construction of practical li-S batteries.

关键词： lithium-sulfur battery (LSB) Dithiobisphthalimide (DTPI) Organic redox mediator Interconversion liTHIUM FRAMEWORK

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Semi-automated detection of rangeland runoff and erosion control berms using high-resolution topography data

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International Soil and Water Conservation Research 2024年第1期12卷 217-226页

作者： li li Changjiang River Scientific Research Institute of Changjiang Water Resources Commission Wuhan430010China Research Center on Mountain Torrent&Geologic Disaster Prevention Ministry of Water ResourcesWuhan430010China University of Arizona School of Natural Resources and the EnvironmentTucsonAZ85719USA

An inventory of topographic modifications is essential to addressing their impacts on hydrological and morphological processes in human-altered ***,such inventories are generally *** study presents two workflows for semi-automatic detection of linear earthen runoff and erosion control berms in rangelands using high-resolution topographic *** workflows consist of initial object identification by applying either morphological grayscale reconstruction(MGR)or the Geomorphon(GEO)method,followed by identification refinements through filters based on objects’horizontal and vertical *** sites were selected within the Altar Valley,Arizona,in the southwestern United *** site was used for developing workflows and optimizing filter thresholds,and the other two sites were used to validate *** results showed that:1)The MGR-based workflow methodology could produce final precision and detection rates of up to 92%and 75%,respectively,and take less than 5 s for a 10.1 km^(2) site;2)The workflow based on the MGR method yielded greater identification accuracy than did the GEO workflow;3)Object length,orientation,and eccentricity were important characteristics for identifying earthen berms,and are sensitive to general channel flow direction and berm shape;4)Manual interrogation of topographic data and imagery can significantly improve identification precision *** proposed workflows will be useful for developing inventories of runoff and erosion control structures in support of sustainable rangeland management.

关键词： Earthen berm Rangeland Grayscale morphological reconstruction Geomorphon liDAR

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