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Overdischarge-induced evolution of Cu dendrites and degradation of mechanical properties in lithium-ion batteries

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Journal of Energy Chemistry 2023年第3期78卷 497-506,I0014页

作者： Zixin Guo Siguo Yang wenyang zhao Shenghui Wang Jiong Liu Zhichao Ma Hongwei zhao Luquan Ren Key Laboratory of CNC Equipment Reliability Ministry of EducationJilin UniversityChangchun 130025JilinChina School of Mechanical and Aerospace Engineering Jilin UniversityChangchun 130015JilinChina Key Laboratory of Bionic Engineering Ministry of Education Jilin UniversityChangchun 130025JilinChina Weihai Institute for Bionics-Jilin University Weihai 264400ShandongChina

The degradation of mechanical properties of overdischarge battery materials manifests as a significant effect on the energy density,safety,and cycle life of the ***,establishing the correlation between depth of overdischarge and mechanical properties is still a significant *** the correlation between depth of overdischarge and mechanical properties is of great significance to improving the energy density and the ability to resist abuse of the *** this paper,the mechanical properties of the battery materials during the whole process of overdischarge from discharge to complete failure were *** effects of depth of overdischarge on the elastic modulus and hardness of the cathode of the battery,the tensile strength and the thermal shrinkage rate of the separator,and the performance of binder were *** precipitation of Cu dendrites on the separator and cathode after dissolution of anode copper foil is a key factor affecting the performance of battery *** Cu dendrites attached to the cathode penetrate the separator,causing irreversible damage to the coating and base film of the separator,which leads to a sharp decline in the tensile strength,thermal shrinkage rate and other properties of the *** addition,the Cu dendrites wrapping the cathode active particles reduce the adhesion of the active particles ***,the active particles are damaged,resulting in a significant decrease in the elastic modulus and hardness of the cathode.

关键词： Overdischarge Cu dendrites Mechanical properties Nanoindentation Micron scratch

TiS_(2)-graphene heterostructures enabling polysulfide anchoring and fast electrocatalyst for lithium-sulfur batteries:A first-principles calculation

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Chinese Physics B 2022年第4期31卷 574-582页

作者： wenyang zhao Li-Chun Xu Yuhong Guo Zhi Yang Ruiping Liu Xiuyan Li College of Physics and Optoelectronics Taiyuan University of TechnologyTaiyuan 030024China

Lithium-sulfur batteries have attracted attention because of their high energy ***,the "shuttle effect" caused by the dissolving of polysulfide in the electrolyte has greatly hindered the widespread commercial use of lithiumsulfur *** this paper,a novel two-dimensional TiS2/graphene heterostructure is theoretically designed as the anchoring material for lithium-sulfur batteries to suppress the shuttle *** heterostructure formed by the stacking of graphene and TiS2 monolayer is the van der Waals type,which retains the intrinsic metallic electronic structure of graphene and TiS2 *** improves the electronic conductivity of the sulfur cathode,and the transferred electrons from graphene enhance the polarity of the TiS2 *** of the polysulfide adsorption show that the TiS2/graphene hetero structure can maintain good metallic properties and the appropriate adsorption energies of 0.98-3.72 eV,which can effectively anchor *** transfer analysis suggests that further enhancement of polarity is beneficial to reduce the high proportion of van der Waals(vdW) force in the adsorption energy,thereby further enhancing the anchoring *** Li2 S decomposition barrier and Li-ion migration barrier imply that the heterostructure has the ability to catalyze fast electrochemical kinetic ***,TiS2/graphene heterostructure could be an important candidate for ideal anchoring materials of lithium-sulfur batteries.

关键词： lithium-sulfur batteries TiS_(2)/graphene heterostructure anchoring material shuttle effect

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减少纤维级PP中“鱼眼”的对策及措施

合成树脂及塑料 2008年第2期25卷 44-46页

作者：赵文央中国石油化工股份有限公司镇海炼化分公司浙江宁波315207

通过分析、模拟纤维级聚丙烯生产过程,确定了在牌号切换过程中造成产品"鱼眼"数超标的原因。在生产工艺操作及牌号切换调整等方面实施了减少"鱼眼"的措施,改进了聚丙烯纤维级产品的质量。

关键词：聚丙烯纤维级鱼眼牌号切换超高相对分子质量

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减少聚乙烯产品中细粉含量的对策

合成树脂及塑料 2014年第4期31卷 52-54页

作者：赵文央中国石油化工股份有限公司镇海炼化分公司生产处浙江省宁波市315207

聚乙烯装置自投产以来,产品中夹带细粉现象日趋明显,用户反映细粉含量问题的频次也有增加。结合系统流程实际情况,观察生产全过程聚乙烯颗粒外表面的变化,找出产生细粉的原因,如聚乙烯产品经过掺混、转贮等工序时,颗粒表面受到摩擦、撞... 详细信息

聚乙烯装置自投产以来,产品中夹带细粉现象日趋明显,用户反映细粉含量问题的频次也有增加。结合系统流程实际情况,观察生产全过程聚乙烯颗粒外表面的变化,找出产生细粉的原因,如聚乙烯产品经过掺混、转贮等工序时,颗粒表面受到摩擦、撞击等外力作用后产生毛刺,在风送过程中毛刺脱落形成细粉。通过优化淘析器除尘效果、增加淘析器空气补充量、定期清除料仓积聚细粉、减少风送系统粒子阻力、实施成品罐不掺混方案等,使细粉含量多的问题得到解决。

关键词：聚乙烯细粉质量控制

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PP产品中“色粒”现象的分析及对策

合成树脂及塑料 2014年第2期31卷 62-64页

作者：赵文央中国石油化工股份有限公司镇海炼化分公司生产处浙江省宁波市315207

分析了聚丙烯产品中出现"色粒"的现象,发现"色粒"与进入挤出机的聚丙烯粉料所带水分有关,而粉料中的水分与蒸汽、循环氮气等介质相关。为避免粉料带水,采取了消除工艺设备存在的缺陷、修改工艺作业程序等措施。排净粉料中间料仓底部积... 详细信息

分析了聚丙烯产品中出现"色粒"的现象,发现"色粒"与进入挤出机的聚丙烯粉料所带水分有关,而粉料中的水分与蒸汽、循环氮气等介质相关。为避免粉料带水,采取了消除工艺设备存在的缺陷、修改工艺作业程序等措施。排净粉料中间料仓底部积水的同时,还把粉料仓底部料作为挤出机初始开工清洗设备的废料,较好地解决了因挤出机开、停工,粉料含水产生"色粒"的产品质量问题。

关键词：聚丙烯色粒超标原因对策

DFDVis:A Visual Analytics System for Understanding the Semantics of Data Flow Diagram

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国际计算机前沿大会会议论文集 2017年第1期 164-166页

作者： Hao Xiong Haocheng Zhang Xiaoju Dong Lingxi Meng wenyang zhao Department of Computer Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Data flow diagram(DFD),as a special kind of data,is a design artifact in both requirement analysis and structured analysis in software ***,rigorous analysis of DFD requires a formal *** representation of DFD and its formal semantics will help to reduce inconsistencies and *** logical structure of DFD can be described using formalism of Calculus of Communicating System(CCS).With a finite number of states based on CCS,state space methods will help a lot in analysis and verification of the behavior of the *** the number of states of even a relatively small system is often very great that is called state *** this paper,we present a visual system which combines Formal methods and visualization techniques so as to help the researchers to understand and analyze the system described by the DFD regardless of the problem of state explosion.

关键词： Data flow diagram(DFD) Calculus of Communicating Systems(CCS) State space Visualization techniques

Investigation and Analysis of Old Houses’ Aseismic Capability in Rural Areas of Jiangxi Province

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Investigation and Analysis of Old Houses’ Aseismic Capabili...

作者： Qiang Zhou wenyang zhao Lingyu Yang Guquan Song School of Civil Engineering and Architecture Nanchang University

Villages and towns are the most earthquake-prone areas in China,due to the backward economic conditions and the lack of aseismic awareness of residents in rural areas,earthquake damage in these areas tend to be *** order to understand the aseismic capability of old houses better in rural areas of Jiangxi province,investigation was carried out in numerous counties of *** structural types,construction time and aseismic construction defects of the old houses were mainly investigated;besides,in view of the old houses’ aseismic construction deficiencies,combined with the existing research,the methods and countermeasures for enhancing the aseismic capability of old houses are given.

关键词： Aseismic capability old house aseismic study strengthening measures disaster prevention and reduction

来源： cnki会议评论

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聚烯烃出现颗粒外观质量问题的原因及对策

合成树脂及塑料 2015年第5期32卷 49-51页

作者：赵文央成芬中国石油化工股份有限公司镇海炼化分公司生产处浙江省宁波市315207 焦作技师学院河南省焦作市4544002

研究了聚乙烯(PE)DFDC-7050中色粒超标及其他牌号中黑粒和细粉以及聚丙烯(PP)中色粒和拖尾粒等影响颗粒外观质量问题的原因。结果表明:PE中色粒超标是因为滑石粉含量偏高,黑粒是因为PE炭化物熔入或黏附在PE颗粒内部或外部,细粉是因为PE... 详细信息

研究了聚乙烯(PE)DFDC-7050中色粒超标及其他牌号中黑粒和细粉以及聚丙烯(PP)中色粒和拖尾粒等影响颗粒外观质量问题的原因。结果表明:PE中色粒超标是因为滑石粉含量偏高,黑粒是因为PE炭化物熔入或黏附在PE颗粒内部或外部,细粉是因为PE颗粒表面的毛刺脱落形成;PP中色粒超标是因为粉料中氮气干燥未达预期效果,拖尾料是因切粒刀不锋利、进刀风压及切刀转速不合适造成的。通过工艺技术改进、操作优化,加强过程质量监控,解决了聚烯烃颗粒外观的质量问题。

关键词：聚烯烃颗粒外观原因分析措施

基于支持向量机的砌体结构震害预测新方法研究

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地震工程与工程振动 2023年第5期43卷 130-137页

作者：周强周杰赵文洋夏贇南昌大学工程建设学院江西南昌330031

应用简便、可靠的震害预测方法对我国大量存在的砌体结构进行抗震性能评估,是防震减灾工作的重要举措。基于支持向量机(support vector machine,SVM)理论提出了砌体结构震害预测新方法。首先,详细阐述了基于SVM的砌体结构震害预测新方... 详细信息

应用简便、可靠的震害预测方法对我国大量存在的砌体结构进行抗震性能评估,是防震减灾工作的重要举措。基于支持向量机(support vector machine,SVM)理论提出了砌体结构震害预测新方法。首先,详细阐述了基于SVM的砌体结构震害预测新方法的基本原理及步骤;其次,确定了砌体结构的震害影响因子及量化值,建立了震害样本数据库及预测模型;最后,将SVM预测结果分别与实际震害结果和BP神经网络预测结果进行对比分析。结果表明,基于SVM模型的砌体结构震害预测方法步骤简单。结果可靠,在样本数据有限的情况下相对BP神经网络算法有较大的优势,可以用于砌体结构的震害预测。

关键词：支持向量机砌体结构震害预测新方法 BP神经网络