【摘 要】
：
ZnS has great potentials as an anode for lithium storage because of its high the-oretical capacity and resource abundance;how-ever,the large volume expansion accompanied with structural collapse and low conductivity of ZnS cause severe capacity fading and
【机 构】
：
State Key Laboratory of Organic-Inorganic Composites,Beijing Key Laboratory of Electrochemical Proce
论文部分内容阅读
ZnS has great potentials as an anode for lithium storage because of its high the-oretical capacity and resource abundance;how-ever,the large volume expansion accompanied with structural collapse and low conductivity of ZnS cause severe capacity fading and inferior rate capability during lithium storage.Herein,0D-2D ZnS nanodots/Ti3C2T(MXene hybrids are pre-pared by anchoring ZnS nanodots on Ti3C2Tx MXene nanosheets through coordination modula-tion between MXene and MOF precursor(ZIF-8)followed with sulfidation.The MXene substrate coupled with the ZnS nanodots can synergistically accommodate volume variation of ZnS over charge-discharge to realize stable cyclability.As revealed by XPS characterizations and DFT calculations,the strong interfacial interaction between ZnS nanodots and MXene nanosheets can boost fast electron/lithium-ion transfer to achieve excellent electrochemical activity and kinetics for lithium storage.Thereby,the as-prepared ZnS nanodots/MXene hybrid exhibits a high capacity of 726.8 mAh g-1 at 30 mA g-1,superior cyclic stability(462.8 mAh g-1 after 1000 cycles at 0.5 A g-1),and excellent rate performance.The present results provide new insights into the understanding of the lithium storage mechanism of ZnS and the revealing of the effects of interfacial interaction on lithium storage performance enhancement.
其他文献
There are plenty of issues need to be solved before the practi-cal application of Li-and Mn-rich cathodes,including the detrimental voltage decay and mediocre rate capability,etc.Element doping can effectively solve the above problems,but cause the loss o
建筑工程项目建设对特定的对象和时间具有限制,对资金方面和经济方面有要求.建筑工程项目建设自身具有相应的复杂性,存在的风险相对较高.因此,文章主要对建筑工程工期风险存在的问题进行分析,并提出可行的建议,以确保建筑工程项目工期风险管理效率有效提升,进而促进建筑工程行业的可持续发展.
为了进一步提升药用真菌学课程的教学质量,培养高素质应用型药用真菌专业人才,围绕国家战略和产业发展趋势,重构了教学内容,重设了教学目标.以一流课程建设和科教融合为导向,改革教学组织,开展“专题化”理论教学、“项目化”实践教学、“协会化”课下教学及“多元化”课程考核.经过近3年的探索和实践,取得了较好的教学效果,为培养高素质应用型药用真菌专业人才奠定了基础.
随着我国社会经济的高速发展,大跨度空间结构得到了迅速发展,广泛应用于机场、展览馆、体育馆和厂房等大型公共建筑中.但是大跨度空间钢结构的施工安装技术,仍然是建筑技术研究的重要课题之一.结合南车株洲大功率半导体器件IGBT产业化建设项目201主厂房钢结构屋面工程钢桁架整体吊装工程,对大跨度空间钢桁架结构的吊装过程涉及的吊点布置,以及钢桁架强度、刚度和稳定性等问题进行综合分析,确定合理的吊点数量与布置方式,选择正确的吊装机械性能参数,提出合适的绑扎方法,为吊装过程提供理论依据,也为相关钢结构安装提供参考.
撞击流技术具有良好的混合效果,广泛应用于能源、环保、化工等工程领域.由于撞击流反应器流场内存在大量无序的湍流涡结构,使其具有良好的混合效果.本文基于撞击流的混合原理,详细叙述了撞击流反应器内不同混合尺度下的混合过程以及涡的演变对混合的影响.结合实验和数值模拟等研究结果,阐述了不同类型撞击流反应器和撞击流反应器多相流场涡特性,归纳了撞击流反应器流场涡的特点.论述了撞击流反应器涡的产生和脱落机理.着重对圆柱射流、平板射流和撞击流流场内涡特性的本征正交分解(POD)分析进行总结,利用流场能量的角度揭示涡演化和消
连云港虹洋热电联产扩建项目(原场址)工程采用钢索液压提升装置吊装汽包方案,相比以往长期使用卷扬机加滑轮组而言,该吊装方案安全性大大提高.使用卷扬机吊装方案,卷扬机在启停的情况下,对锅炉钢架的稳定性很容易产生较大的晃动,从而大大降低安全性;而在液压提升装置吊装过程中,起吊平稳,在炉顶可以采用大跑车和小跑车前后左右移动,避免了汽包的偏心,减少了倾斜度,充分利用了锅炉钢架的狭小空间.
The 3D hollow hierarchi-cal architectures tend to be designed for inhibiting stack of MXene flakes to obtain satisfactory lightweight,high-efficient and broadband absorbers.Herein,the hollow NiCo compound@MXene networks were prepared by etching the ZIF 67
Ultra-thin flexible films have attracted wide attention because of their excellent ductility and potential versatility.In particu-lar,the energy-harvesting films(EHFs)have become a research hot-spot because of the indispensability of power source in vario
在风力发电机组高塔筒、低风速的发展趋势推动下,以及为抢占风能资源,山地风电场在国内西南地区、东北地区发展迅速.风机设备及吊装机械运输涉及大型运输机械、吊装机械等危险作业,具有设备尺寸大,吨位重,道路修筑难度大等特点.简要分析了山地风电场运输道路保证运输安全的需要,并就山地风电场道路的修筑提出了要求,经过部分风场的实践证明,具有一定的成效.
Electronic skins(e-skins)with an excellent sensing performance have been widely developed over the last few decades.However,wearability,biocompatibility,environmental friendliness and scalability have become new limitations.Self-healing ability can improv