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1,3-二甲基咪唑啉酮:一种理想的溶剂用于含预处理负极的高性能锂氧气电池

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Science Bulletin 2022年第2期67卷 141-150,M0003页

作者： Zhimei Huang Jintao Meng Wang Zhang Yue Shen Yunhui Huang State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China College of Materials Science and Engineering Shenzhen UniversityShenzhen 518055China

电解质被广泛认为是锂氧气电池中的关键成分,因为它极大地影响电池的充放电反应动力学和可逆性.本文提出了1,3-二甲基咪唑啉酮(dmi)作为一种极好的电解液溶剂用于锂氧气电池中,该溶剂与传统的醚类和砜类溶剂相比,对过氧化锂(Li_(2)O_(2)... 详细信息

电解质被广泛认为是锂氧气电池中的关键成分,因为它极大地影响电池的充放电反应动力学和可逆性.本文提出了1,3-二甲基咪唑啉酮(dmi)作为一种极好的电解液溶剂用于锂氧气电池中,该溶剂与传统的醚类和砜类溶剂相比,对过氧化锂(Li_(2)O_(2))和碳酸锂(Li_(2)CO_(3))具有较高的溶解度,该性质不仅可抑制电池在放电时的正极钝化,同时可促进充电过程中的液相氧化还原反应,降低电池的过电位以及提高电池的循环性能.尽管dmi溶剂在正极方面具有多种优势,但dmi对金属锂负极不稳定.为此,本文开发了一种在金属锂表面构筑人工固态电解质膜(SEI)作为保护膜阻止锂表面副反应的方法.通过有机氟化试剂与金属锂反应得到的电解质膜由高离子电导性的Li_(x)BO_(y), LiF, Li_(x)NO_(y), Li_(3)N颗粒及一些有机物构成,其中Li_(x)BO_(y)作为耦联剂可提高该膜的机械强度.有了这层保护膜之后,在dmi电解液中,锂沉积/剥离的库伦效率可从20%提高至98.5%,同时,组装的锂氧气电池在限容条件下进行循环,循环寿命长达205圈,几乎是二甲基亚砜(DMSO)或四乙二醇二甲醚(TEGDME)体系中的5倍.研究表明,分子极性和离子溶剂化结构是设计高性能锂-氧气电池电解质时要考虑的主要问题,而耦联的人工SEI可有效提高负极的稳定性.

关键词：锂氧气电池固态电解质充电过程循环寿命 dmi 离子溶剂化金属锂分子极性

Magnetic skyrmions:intriguing physics and new spintronic device concepts

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National Science Review 2019年第2期6卷 210-212页

作者： Yan Zhou School of Science and Engineering The Chinese University of Hong Kong

The mathematical concept of skyrmions was first introduced by high-energy physicist Tony Skyrme in 3D space for describing the stability of hadrons as objects possessing non-trivial topological numbers in a non-linear sigma model. Later on, the original concept of skyrmions was generalized to various condensed-matter systems such as

关键词： Magnetic skyrmions:intriguing physics and new spintronic device concepts dmi

Anisotropic Dzyaloshinskii-Moriya interaction protected by D_(2d) crystal symmetry in two-dimensional ternary compounds

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npj Computational Materials 2022年第1期8卷 1209-1215页

作者： Yonglong Ga Qirui Cui Yingmei Zhu Dongxing Yu Liming Wang Jinghua Liang Hongxin Yang Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo315201China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China

Magnetic skyrmions,topologically protected chiral spin swirling quasiparticles,have attracted great attention in fundamental physics and applications.Recently,the discovery of two-dimensional(2D)van der Waals(vdW)magnets have aroused great interest due to their appealing physical properties.Moreover,both experimental and theoretical works have revealed that isotropic Dzyaloshinskii–Moriya interaction(dmi)can be achieved in 2D magnets or ferromagnet-based heterostructures.However,2D magnets with anisotropic dmi haven’t been reported yet.Here,via using first-principles calculations,we unveil that anisotropic dmi protected by D_(2d)crystal symmetry can exist in 2D ternary compounds MCuX_(2)(M:3d transition metal(TM),X:group VIA).Interestingly,by using micromagnetic simulations,we demonstrate that ferromagnetic(FM)antiskyrmions,FM bimerons,antiferromagnetic(AFM)antiskyrmions,and AFM bimerons can be realized in the MCuX_(2)family.Our discovery opens up an avenue to creating antiskyrmions and bimerons with anisotropic dmi protected by D_(2d)crystal symmetry in 2D magnets.

关键词： dmi symmetry magnets

A spurious positive Indian Ocean Dipole in 2017

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Science Bulletin 2018年第18期63卷 1170-1172页

作者： Lianyi Zhang Yan Du Wenju Cai South China Sea Institute of Oceanology Chinese Academy of Sciences College of Earth Science University of Chinese Academy of Sciences Physical Oceanography Laboratory/CIMSST Ocean University of China and Qingdao National Laboratory for Marine Science and Technology Centre for Southern Hemisphere Oceans Research CSIRO Marine and Atmospheric Research

The Indian Ocean Dipole (IOD) is an intrinsic ocean-atmosphere coupled mode in the tropical Indian Ocean (IO)[1,2]. It features a sea surface temperature (SST) anomaly gradient, defined by the dipole mode index (dmi), the difference of area-averaged SST anomaly between the western tropical IO (50°–70°E, 10°N–10°S)and the southeastern tropical IO (90°–110°E, Eq.-10°S). The IOD event tends to develop and mature in the boreal summer and fall seasons. When a positive IOD (p IOD) occurs, SST warms up in the west and cools down in the east, which sets up an east-west pressure gradient. The atmosphere hence responds to the

关键词：印度洋偶极子热带印度洋海表面温度 SST 子模式 dmi 海洋

Simultaneous refractive index and temperature measurements by using dual interference in an all-fiber Mach–Zehnder interferometer

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Chinese Optics Letters 2016年第3期14卷 23-27页

作者：闫旭傅海威李辉栋乔学光 Ministry of Education Key Laboratory on Photoelectric Oil-Gas Logging and Detecting School of ScienceXi'an Shiyou UniversityXi'an 710065China

A Fourier analysis applied to the Mach-Zehnder interferometer （MZI） transmission spectrum for simultaneous refractive index （RI） and temperature measurements is proposed and experimentally demonstrated in this Letter. In the fast Fourier transform （FFT） spectrum of the MZI transmission spectrum, several frequency components are generally observed, which means that the transmission spectrum of the MZI is formed by the superposition of some dual-mode interference （dmi） spectra, and each frequency component represents different core-cladding interferences. We can select some dominant frequency components in the FFT spectrum of the MZI transmission spectrum to take the inverse FFT （IFFT）. Then, the corresponding dmi patterns can be obtained. Due to the shift of the wavelength of these dmi spectra with changes in the environmental parameters, we can use the coefficient matrix of these dmi spectra for multi-parameter sensing. In this Letter, two dmi patterns are separated from the resultant transmission spectrum of the MZI. As the RI and temperature change, the shifts of the two dmi patterns with respect to the RI and temperature will be observed. The sensitivities of the RI and temperature are -137.1806 nm/RIU （RI unit） and 0.0860 nm/℃, and -22.9955 nm/RIU and 0.0610 nm/℃ for the two dmis. Accordingly, it can be used to simultaneously measure RI and temperature changes. The approach can eliminate the influence of multiple interferences and improve the accuracy of the sensor.

关键词： RIU MZI dmi Simultaneous refractive index and temperature measurements by using dual interference in an all-fiber Mach Zehnder interferometer

THE VERTICAL THERMAL STRUCTURE OF THE INDIAN OCEAN DIPOLE MODE FROM WOCE DATA

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Journal of Hydrodynamics 2001年第3期13卷 24-27页

作者： Yu Wei-dong Key Laboratory of Marine Science and Numerical Modeling, State Oceanic Administration, First Institute of Oceanography, Qingdao 266061, China First Inst. of Oceanography State Oceanic Administration Qingdao 266061 China

The Dipole Mode in tropical Indian Ocean (dmi) is a newly verified independent internal mode of atmosphere ocean system in Indian Ocean. Its surface manifestation is illustrated in detail with the aid of the historical data sets. But relatively few is known about its vertical characteristics. Here the vertical thermal structure of dmi is analyzed using the newly released WOCE GLOBAL DATA (V2.0). Attention is focused on the comparison of the abnormal upper ocean thermal structure along one section with the normal state in year 1990 respectively in two cases: in year 1994 when there was IDM but no E1 Nino and in year 1997 when there were dmi and also E1 Nino. This may shed light on the further theoretical and numerical study of IDM.

关键词： dmi thermal structure

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智能交通系统(ITS)信息采集技术评述

哈尔滨工业大学学报 2003年第1期35卷 17-20页

作者：马骥裴玉龙哈尔滨工业大学交通科学与工程学院黑龙江哈尔滨150001

实时交通信息是实现城市交通智能化的关键 ,是ITS各子系统实施的核心基础数据和重要前提 ,在交通规划和交通管理控制等方面具有广泛的应用前景 .有效利用实时交通信息是智能交通系统中最基础、最重要的组成部分 ,介绍了用于驾驶员信息... 详细信息

实时交通信息是实现城市交通智能化的关键 ,是ITS各子系统实施的核心基础数据和重要前提 ,在交通规划和交通管理控制等方面具有广泛的应用前景 .有效利用实时交通信息是智能交通系统中最基础、最重要的组成部分 ,介绍了用于驾驶员信息和交通控制系统的路边及中枢设备和应用便携式计算机对车速及延误进行采集处理两种信息采集技术 ,探讨了系统的辅助功能及其相互影响。

关键词：智能交通系统 ITS 信息采集 dmi 交通管理交通控制