Designable ultra-smooth ultra-thin solid-electrolyte interphases of three alkali metal anodes

该研究是在毛秉伟教授和董全峰教授共同指导下，由2014级博士生谷宇、2016级博士生王卫伟、2013级博士生李艺娟等同学通力合作的成果。泉州师范学院吴启辉教授和上海应用物理研究所樊春海研究员分别在X射线光电子能谱表征和同步辐射表征中提供了大力支持。化学化工学院郑明森副教授、颜佳伟教授、吴德印教授、iChEM研究员丁松园博士在实验和理论计算方面给予了大力帮助；田中群教授和郑南峰教授等对此工作提出了宝贵意见。 金属锂是下一代高能量密度二次电池最理想的负极材料之一。在以金属锂作为负极的电池中，锂电沉积过程中枝晶的生长及溶解过程的死锂现象是制约电池库仑效率、稳定性和安全性的重要因素，而金属锂表面的微观平整性及固态电解质界面（SEI）膜的组成和结构及由其所决定的电学和力学性质对锂电沉积和溶解行为有重要影响。 课题组所发展的电化学调控方法可进一步拓展到钠、钾碱金属负极上，形成大范围原子平整的钠、钾表面和超薄超光滑的SEI膜。特别是金属钠平面电极可在2 mA cm–2（1 mAh cm–2）100% Na DOD下稳定循环550周以上且库伦效率近100%。这一基于电化学调控的碱金属表面抛光和SEI膜构筑的方法及多尺度联合表征，为解决碱金属负极问题提供了新的思路，也为开展表面科学基础研究提供高质量的碱金属表面。【Abstract】Dendrite growth of alkali metal anodes limited their lifetime for charge/discharge cycling. Here, we report near-perfect anodes of lithium, sodium, and potassium metals achieved by electrochemical polishing, which removes microscopic defects and creates ultra-smooth ultra-thin solid-electrolyte interphase layers at metal surfaces for providing a homogeneous environment. Precise characterizations by AFM force probing with corroborative in-depth XPS profile analysis reveal that the ultra-smooth ultra-thin solid-electrolyte interphase can be designed to have alternating inorganic-rich and organic-rich/mixed multi-layered structure, which offers mechanical property of coupled rigidity and elasticity. The polished metal anodes exhibit significantly enhanced cycling stability, specifically the lithium anodes can cycle for over 200 times at a real current density of 2 mA cm-2 with 100% depth of discharge. Our work illustrates that an ultra-smooth ultra-thin solid-electrolyte interphase may be robust enough to suppress dendrite growth and thus serve as an initial layer for further improved protection of alkali metal anodes.This work was supported by the MOST projects (2015CB251102, 2012CB932902) and the NSFC projects (U1305246, 21621091, 21473147, 21533006, 21673193). 研究工作得到科技部973计划（项目批准号：2015CB251102、2012CB932902），国家自然科学基金（项目批准号：U1305246、21621091、21473147、21533006、21673193）等项目的资助

基于试件强度及成型精度的DLP光敏树脂3D打印工艺参数研究

针对材料厂商标定的参考曝光时间较长且打印试件成型精度较低的问题,以齿科专用光敏树脂(D992)为原料,打印不同曝光时间的测试件,并进行拉伸试验和精度测量试验,对其力学性能和成型精度进行研究。研究结果表明:试件的固化强度随单层曝光时间的增大而增大;单层曝光时间为3.0 s时,试件的固化强度达到最高强度的37%,满足打印要求,此时试件的成型精度达到最高。所采用的试验研究方法及结论对制定数字光处理(DLP)光敏树脂3D打印的工艺流程具有重要的参考价值

Kinetics and Characteristics of Electrocatalytic Oxidation of Formic Acid on Pt(110)/Sb Electrodes

研究了 Sb在 Pt( 1 1 0 )晶面上不可逆吸附电化学特性及甲酸在 Sbad修饰 Pt( 1 1 0 )电极 [Pt( 1 1 0 ) /Sb]上的电催化氧化特征及其反应动力学 .发现当扫描电位的上限 Eu≤ 0 .4 5 V时 ,Sbad可稳定地吸附在 Pt( 1 1 0 )表面上 ,从而有效地抑制了甲酸的解离吸附 .与未修饰的 Pt( 1 1 0 )上的结果相比 ,在 Pt( 1 1 0 ) /Sb上甲酸氧化的峰电位负移了 0 .35 V.当θSb=0 .1 2 6时 ,Pt( 1 1 0 ) /Sb电极对甲酸的电催化活性最高 .还研究了 Pt( 1 1 0 ) /Sb上甲酸氧化反应的动力学 ,定量解析了不同θSb下甲酸氧化的速度常数 kf和传递系数βThe electrochemical behavior of irreversibly adsorbed antimony on Pt(110) was studied by using cyclic voltametry. The results demonstrated that the Sb ad atoms are stable on Pt(110) when the electrode potentials are below 0.45 V( vs. SCE). We illustrated that various coverages of Sb ad can be easily obtained by controlling the number of potential cycling and the upper limit of potential scan. It was found that the dissociative adsorption of formic acid was inhibited by the presence of Sb ad on Pt(110) surface. The electrocatalytic effects of Sb ad toward HCOOH electrooxidation is demonstrated by the negative shift of oxidation potential(about 0.35 V) and the enhancement of oxidation current. The maximum current density was measured for a Sb coverage of 0.126. Based on methods developed in our previous papers, the kinetics of HCOOH electrooxidation on Pt(110)/Sb electrodes of different θ Sb has been studied, and both the rate constant k f and transfer coefficient β were determined quantitatively.国家自然科学基金 (批准号 :2 99730 35

Kinetics and characteristics of electrocatalytic oxidation of formic acid on Pt (110)/Sb electrodes

The electrochemical behavior of irreversibly adsorbed antimony on Pt(110) was studied by using cyclic voltametry. The results demonstrated that the Sb-ad atoms are stable on Pt (110) when the electrode potentials are below 0.45 V (vs. SCE). We illustrated that various coverages of Sb-ad can be easily obtained by controlling the number of potential cycling and the upper limit of potential scan. It was found that the dissociative adsorption of formic acid was inhibited by the presence of Sb-ad on Pt (110) surface. The electrocatalytic effects of Sb-ad toward HCOOH electrooxidation is demonstrated by the negative shift of oxidation potential(about 0.35 V) and the enhancement of oxidation current. The maximum current density was measured for a Sb coverage of 0.126. Based on methods developed in our previous papers, the kinetics of HCOOH electrooxidation on Pt(110)/Sb electrodes of different 0(Sb) has been studied, and both the rate constant k(f) and transfer coefficient beta were determined quantitatively

一种用于粉末原料运输转移的装置

本发明公开了一种用于粉末原料运输转移的装置，包括设备外壳，所述设备外壳上安装有一料筒，同时，所述设备外壳内还设置有控制器，以及与控制器相连的直线送料器、计量秤斗、称重传感器和卸料斗，其中所述直线送料器位于料筒出料口下方，所述计量秤斗位于所述直线送料器的尾端，包括上端口、下端口，同时，所述称重传感器通过连接件连接于所述计量秤斗上，且所述卸料斗位于所述下端口处。本设备是专门针对于密胺制品研发，相对于市面上的其他设备，主要优点是结构简单，造价低廉，易清理，能满足使用不同颜色粉料的要求，占地空间小，能基本满足密胺制品的基本需求

基于自由曲面的三维散乱点集数据进行路径规划的方法

本发明涉及一种基于自由曲面的三维散乱点集数据进行路径规划的方法，该方法通过自由曲面的散乱数据插值重构，将三维离散数据点拟合成三角Bernstein-Bézier曲面，再利用三角Bernstein-Bézier曲面对获得的插值曲面进行六维轨迹规划；对于沿任意方向的轨迹规划，可以通过将此方向坐标变换到x-y坐标方向得到轨迹规划；所述的三角Bernstein-Bézier曲面为三次三角Bernstein-Bézier曲面。本发明方法利用三角Bernstein-Bézier曲面，对三维散乱点集数据自由曲面进行拟合以及在插值曲面上规划六维加工轨迹，从而实现了对任意自由曲面的三维散乱点集数据的路径规划

一种空间三维自由曲线的测量方法

本发明涉及一种空间三维自由曲线的测量方法，该方法利用集成化柔性激光加工系统、三座标测量机或数控机床，根据自由曲线的自身特点，首先获取待测三维自由曲线上的特征点，然后，以特征点列作为插值点列，拟合累加弦长三次参数样条曲线作为实际待测曲线的数学模型，通过自适应的调整累加弦长参数作为测量步长，插值产生下一个探测点和避障点；所述的特征点是指待测曲线上的拐点、大曲率处的加密测量点、起始点和结束点。本发明的一种空间三维自由曲线的测量方法，实现了三维自由曲线的数字化并做到合理地布置测点，提高测量效率、精度和安全性