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Accelerating lithium-sulfur battery reaction kinetics and inducing 3D deposition of li_(2)S using interactions between Fe_(3)Se_(4)and lithium polysulfides

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Journal of Energy Chemistry 2024年第8期95卷 540-553,I0012页

作者： Yihan lin liheng li Longjie Tan Yongliang li Xiangzhong Ren Peixin Zhang Chuanxin He lingna Sun College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060GuangdongChina

Although lithium-sulfur batteries(LSBs)exhibit high theoretical energy density,their practical application is hindered by poor conductivity of the sulfur cathode,the shuttle effect,and the irreversible deposition of li_(2)*** address these issues,a novel composite,using electrospinning technology,consisting of Fe_(3)Se_(4)and porous nitrogen-doped carbon nanofibers was designed for the interlayer of *** porous carbon nanofiber structure facilitates the transport of ions and electrons,while the Fe_(3)Se_(4)material adsorbs lithium polysulfides(liPSs)and accelerates its catalytic conversion ***,the Fe_(3)Se_(4)material interacts with soluble liPSs to generate a new polysulfide intermediate,li_(x)FeS_(y)complex,which changes the electrochemical reaction pathway and facilitates the three-dimensional deposition of li_(2)S,enhancing the reversibility of *** designed LSB demonstrates a high specific capacity of1529.6 mA h g^(-1)in the first cycle at 0.2 *** rate performance is also excellent,maintaining an ultra-high specific capacity of 779.7 mA h g^(-1)at a high rate of 8 *** investigation explores the mechanism of the interaction between the interlayer and liPSs,and provides a new strategy to regulate the reaction kinetics and li_(2)S deposition in LSBs.

关键词： lithium-sulfur batteries Polysulfide intermediates li_(2)S electrodeposition Interlayers Electrostatic spinning Adsorption Catalysis

合伙人退伙与审计质量:晚节效应还是期限效应?

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财经论丛 2022年第9期 69-79页

作者：闫焕民梅可心李瑶瑶南昌大学经济管理学院江西南昌330031

目前我国合伙制会计师事务所呈现“合伙人老龄化、代际结构欠佳”常态,亟需通过科学有序的合伙人晋退机制解决代际传承问题。本文采用我国原证券资格事务所的审计合伙人退伙记录,考察合伙人退伙行为如何影响审计质量。研究表明:(1)相比... 详细信息

目前我国合伙制会计师事务所呈现“合伙人老龄化、代际结构欠佳”常态,亟需通过科学有序的合伙人晋退机制解决代际传承问题。本文采用我国原证券资格事务所的审计合伙人退伙记录,考察合伙人退伙行为如何影响审计质量。研究表明:(1)相比退伙之前的往常业务,合伙人在退伙之际业务中提供了高质量的审计服务,呈现为“晚节效应”;(2)进一步划分退伙模式,相比返聘原所,合伙人完全退伙时在一定程度上呈现出更强的“晚节效应”,机会主义行为更少,高质量审计保障效果更强;(3)在事务所治理机制分析中,严格的事务所内部治理更能保障合伙人退伙之际的审计业务质量,实现合伙人高质高效退出。此外,拓展研究发现合伙人资历越老、同侪监督压力越大、外部市场越发达,合伙人退伙“晚节效应”越强,退伙效率越高。本文考察合伙人退伙行为及其约束机制,为事务所合理设计合伙人退伙机制、为监管部门科学制定合伙人代际传承的相关规范制度提供理论依据与启示。

关键词：审计合伙人退伙审计质量晚节效应期限效应

Boosting the performance of liNi_(0.90)Co_(0.06)Mn_(0.04)O_(2) electrode by uniform li_(3)PO_(4) coating via atomic layer deposition

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Chinese Chemical Letters 2024年第5期35卷 499-503页

作者： Mingjiao Lu Zhixing Wang Gui Luo Huajun Guo Xinhai li Guochun Yan Qihou li Xianglin li Ding Wang Jiexi Wang School of Metallurgy and Environment Central South UniversityChangsha 410083China BASF ShanShan Battery Materials Co. Ltd.Changsha 410006China Engineering Research Center of the Ministry of Education for Advanced Battery Materials Central South UniversityChangsha 410083China Hunan Provincial Key Laboratory of Nonferrous Value-Added Metallurgy Central South UniversityChangsha 410083China School of Physics and Chemistry Hunan First Normal UniversityChangsha 410205China National and Local Joint Engineering Laboratory for lithium-ion Batteries and Materials Preparation Technology Key Laboratory of Advanced Battery Materials of Yunnan ProvinceFaculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunming 650093China

Ultra-high nickel material is considered to be a promising cathode ***,with the increase of nickel content,the interfacial side reactions between the cathode and electrolyte become increasingly ***,an atomically controllable ionic conductor li_(3)PO_(4)(LPO)coating is deposited on the liNi_(0.90)Co_(0.06)Mn_(0.04)O_(2)(NCM9064)based electrode by the atomic layer deposition *** results shows that the LPO coating is uniformly and densely covered on the surface of secondary particles of NCM9064,helping to prevent the direct contact between the electrolyte and cathode during the chargingdischarging *** addition,the coating layer is electrochemically *** a result,the interfacial side reactions during the long cycle are effectively suppressed,and the solid electrolyte interphase layer at the interface is *** electrode with 20 layers of LPO deposition(ALD-LPO-20)exhibits an excellent capacity retention of 81%after 200 cycles in 2.8-4.3 V at 25℃,which is 18%higher than the unmodified material(ALD-LPO-0).Besides,the moderate LPO coating improves the rate capability and high temperature cycling performance of *** study provides a method for the modification of ultra-high nickel cathode materials and corresponding electrodes.

关键词： Ultra-high nickel material liNi_(0.90)Co_(0.06)Mn_(0.04)O_(2) Atomic layer deposition li_(3)PO_(4) Ionic conductor

耕地保护田长制的政策工具谱系模型与政策启示——基于扎根理论的政策文本实证分析

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中国土地科学 2024年第1期38卷 94-104页

作者：方印李杰佀耀耀贵州大学法学院贵州贵阳550025

研究目的:分析各省市相继出台的耕地保护田长制实施(工作)方案,描绘其政策工具全貌及其使用特征,为政策完善与优化提供参考。研究方法:扎根理论,内容分析法。研究结果:(1)耕地保护田长制的政策工具谱系模型为“四维驱动式凌锥模型”,该... 详细信息

研究目的:分析各省市相继出台的耕地保护田长制实施(工作)方案,描绘其政策工具全貌及其使用特征,为政策完善与优化提供参考。研究方法:扎根理论,内容分析法。研究结果:(1)耕地保护田长制的政策工具谱系模型为“四维驱动式凌锥模型”,该模型由目标导向型政策工具、系统变革型政策工具、过程控制型政策工具、能力建设型政策工具耦合而成;(2)“注意力分配—职权责明晰—有序化运作—积极性调动”是耕地保护田长制的政策工具使用逻辑,立足此逻辑有助于畅通耕地保护“最后一公里”;(3)当前耕地保护田长制在政策工具使用上存在组合结构不合理、可操作性不强、创新性不足、实质效力不高等问题。研究结论:未来应协调政策工具使用比例,优化组合结构的适配性;细化政策工具操作流程,增强内容要素的精准性;注重政策工具创新变革,培育内生动力的发展性;提升政策工具效力层级,夯实功能发挥的有效性。

关键词：耕地保护田长制地方政府政策工具扎根理论

Layered niobium carbide enabling excellent kinetics and cycling stability of li-Mg-B-H hydrogen storage material Layered niobium carbide enabling excellent kinetics

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Rare Metals 2024年第3期43卷 1153-1166页

作者： li-Wen Lu Hui Luo Guang-Xu li Yun li Xin-Hua Wang Cun-Ke Huang Zhi-QiangLan Wen-Zheng Zhou Jin Guo Mohammad Ismail Hai-Zhen liu Guangxi Novel Battery Materials Research Center of Engineering Technology Guangxi Colleges and Universities Key Laboratory of Blue Energy and Systems IntegrationSchool of Physical Science and TechnologyGuangxi UniversityNanning530004China State Key Laboratory of Featured Metal Materials and life-Cycle Safety for Composite Structures Nanning530004China School of Mechanical and Electrical Engineering Quzhou College of TechnologyQuzhou324000China Department of Materials Science and Engineering Zhejiang UniversityHangzhou310027China Faculty of Ocean Engineering Technology and Informatics Universiti Malaysia Terengganu21030Kuala NerusTerengganuMalaysia Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin300071China

The li-Mg-B-H composite(2liBH_(4)+MgH_(2))has a high capacity of 11.4 wt%as a hydrogen storage ***,the slow kinetics and poor cycling stability severely restrict its practical *** this work,a layered Nb_(2)C MXene was first synthesized and then introduced to tailor the kinetics and cycling stability of the li-Mg-B-H *** milled 2liH+MgB_(2)composites were initially hydrogenated to obtain the 2liBH_(4)+MgH_(2)*** 2liBH_(4)+MgH_(2)+5wt%Nb_(2)C can release 9.0 wt%H_(2)in 30 min at 400℃,while it is only 2.7 wt%for the undoped 2liBH_(4)+MgH_(2).The dehydrogenation activation energies of MgH_(2)and liBH_(4)are 123 and 154 kJ·mol^(-1)respectively for the 5 wt%Nb_(2)C-doped composite,lower than the undoped composite(164 and 165 kJ·mol^(-1)).The 2liBH_(4)+MgH_(2)+5 wt%Nb_(2)C possesses excellent cycling stability,with the reversible capacity only slightly reduced from 9.4 wt%for the 1st cycle to 9.3 wt%for the 20th ***_(2)C keeps stable in the composite and acts as an efficient catalyst for the li-Mg-B-H *** is believed that both the layered structure and the active Nb element contribu te to the enhanced hydrogen storage performances of the li-Mg-B-H *** work confirms that the Nb_(2)C MXene with layered stru cture has a significant enhancing impact on the li-Mg-B-H hydrogen storage materials,which is different from the bulk NbC.

关键词： Hydrogen storage lithium borohydride Magnesium hydride Nb_(2)C MXene

Hard-carbon hybrid li-ion/metal anode enabled by preferred mesoporous uniform lithium growth mechanism

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Journal of Energy Chemistry 2024年第1期88卷 252-259,I0006页

作者： Fang Yan Yan liu Yuan li Yan Wang Zicen Deng Meng li Zhenwei Zhu Aohan Zhou Ting li Jingyi Qiu Gaoping Cao Shaobo Huang Biyan Wang Hao Zhang School of Chemistry and Biological Engineering University of Science and TechnologyBeijing 100083China Research Institute of Chemical Defense Beijing 100191China College of Physics and Engineering Henan University of Science and TechnologyLuoyang 471023HenanChina National Base for International Science&Technology Cooperation School of ChemistryXiangtan UniversityXiangtan 411105HunanChina Materials and Manufacturing Department Beijing University of TechnologyBeijing 100124China

To achieve high energy density in lithium batteries,the construction of lithium-ion/metal hybrid anodes is a promising *** particular,because of the anisotropy of graphite,hybrid anode formed by graphite/li metal has low transport kinetics and is easy to causes the growth of lithium dendrites and accumulation of dead li,which seriously affects the cycle life of batteries and even causes safety ***,by comparing graphite with two types of hard carbon,it was found that hybrid anode formed by hard carbon and lithium metal,possessing more disordered mesoporous structure and lithophilic groups,presents better *** indicate that the mesoporous structure provides abundant active site and storage space for dead *** the synergistic effect of this structure and lithophilic functional groups(–COOH),the reversibility of hard carbon/lithium metal hybrid anode is maintained,promoting uniform deposition of lithium metal and alleviating formation of lithium *** hybrid anode maintains a 99.5%Coulombic efficiency(CE)after 260 cycles at a specific capacity of 500 m Ah/*** work provides new insights into the hybrid anodes formed by carbon-based materials and lithium metal with high specific energy and fast charging ability.

关键词： Hard carbon/li metal hybrid anode Mesoporous structure Surface oxygen functional group Fast charging lithium batteries

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浅析临床不合理用药

亚太传统医药 2007年第12期3卷 94-96页

作者：李瑶瑶荆楚理工学院药学院湖北荆门448000

目的：保障患者用药安全，促进合理用药。方法：随机抽查某院2005-2006年的门诊输液处方5849张，根据临床药理学知识及文献资料，对不合理用药处方进行分类和统计分析。结果：联合用药较多，占调查处方的60．16％；不合理用药处方共467... 详细信息

目的：保障患者用药安全，促进合理用药。方法：随机抽查某院2005-2006年的门诊输液处方5849张，根据临床药理学知识及文献资料，对不合理用药处方进行分类和统计分析。结果：联合用药较多，占调查处方的60．16％；不合理用药处方共467张，占调查处方的7．99％，多为重复用药、联合用药不当、用法不当。结论：合理用药是一项涉及多方面的系统工程，有关方面应共同努力，为开展合理用药创造良好环境。

关键词：临床用药输液处方用药分析

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郑州市人居环境质量评价研究

绿色科技 2013年第6期15卷 194-198页

作者：李瑶瑶郑州大学水利与环境学院河南郑州450002

指出了随着工业化和城市化进程的不断加快,城市人居环境质量评价与优化研究日益成为城市研究的热点。立足于人居环境的宏观层面,分别从社会经济环境、居住环境、生态环境及基础设施与公共服务设施等4个方面构建了人居环境质量评价指标体... 详细信息

指出了随着工业化和城市化进程的不断加快,城市人居环境质量评价与优化研究日益成为城市研究的热点。立足于人居环境的宏观层面,分别从社会经济环境、居住环境、生态环境及基础设施与公共服务设施等4个方面构建了人居环境质量评价指标体系,运用层次分析法对各评价指标的权重赋值,最后运用人居环境质量指数和系统协调度两个模型评价郑州市的人居环境现状,并在结果分析的基础上提出了建议。研究结果表明:郑州市人居环境质量为"良",且其内部系统处于一种优质协调的可持续发展状态,有较高的稳定性。

关键词：人居环境指标体系层次分析法评价

HFMEA模式在危重症护理交接班管理中应用

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西藏医药 2023年第2期44卷 3-5页

作者：李瑶瑶眉山市人民医院呼吸与危危症医学科四川眉山620010

目的探讨基于医疗失效模式-效应分析(HFMEA)的危重症护理交接班管理对交接班质量的影响。方法以2021年2月实施基于HFMEA的危重症护理交接班管理为分界点,将2020年1月-2021年1月呼吸与危重症医学科实施常规交接班模式管理的护士及患者作... 详细信息

目的探讨基于医疗失效模式-效应分析(HFMEA)的危重症护理交接班管理对交接班质量的影响。方法以2021年2月实施基于HFMEA的危重症护理交接班管理为分界点,将2020年1月-2021年1月呼吸与危重症医学科实施常规交接班模式管理的护士及患者作为研究对象,归为HFMEA管理前组,将2021年2月-2022年2月实施基于HFMEA的危重症护理交接班管理的护士及患者归为HFMEA管理后组。管理前后护士为同一批人员,患者各按随机数字表法选取对应时间段41例患者,比较管理前后护士间交接班质量和患者家属满意度。结果HFMEA管理后组护士交(接)班质量[交(接)班环境、交(接)临床判断、交(接)沟通技巧、交(接)人文关怀、交(接)组织效率和总体交(接)班能力]评分显著高于HFMEA管理前组,组间差异具有统计学意义(P<0.05);HFMEA管理后组患者家属满意度97.56%显著高于HFMEA管理前组85.37%,组间差异具有统计学意义(P<0.05)。结论基于HFMEA模式的危重症护理交接班管理,能有效提高护士交、接班质量及患者家属满意度。

关键词： HFMEA 危重症护理交接班质量