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high Brightness,high power density Fiber Coupling of high power Laser Diode

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Journal of Semiconductors 2001年第9期22卷 1112-1115页

作者：王晓薇肖建伟王仲明马骁宇刘宗顺方高瞻张敬明冯小明中国科学院半导体研究所国家光电子工程中心北京100083

The output radiation from the 100μm×1μm aperture of a high power Laser Diode (LD) is efficiently coupled into a 50μm multimode optical *** fiber output of the high power LD with high brightness and high power density is *** power density is up to 3 6×104W/cm2 and the coupling efficiency is 70%.The extreme divergence and the astigmatism of high power LDs require the optics with complex lens structures and high performance.A double-curved lens with two crossed cylindrical lenses structured on both sides of the glass substrate is used in the coupling system.

关键词： high power LD double-curved lens fiber coupling high brightness high power density

Nitrogen-doped carbon stabilized Li Fe0.5Mn0.5PO4/rGO cathode materials for high-power Li-ion batteries

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Chinese Journal of Chemical Engineering 2020年第7期28卷 1935-1940页

作者： Haifeng Yu Zhaofeng Yang Huawei Zhu Hao Jiang Chunzhong Li Key Laboratory for Ultrafine Materials of Ministry of Education School of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237China Shanghai Engineering Research Center of Hierarchical Nanomaterials School of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China

Exploring high ion/electron conductive olivine-type transition metal phosphates is of vital significance to broaden their applicability in rapid-charging ***,we report an interface engineered Li Fe0.5Mn0.5PO4/rGO@C cathode material by the synergistic effects of r GO and polydopamine-derived N-doped *** well-distributed Li Fe0.5Mn0.5PO4nanoparticles are tightly anchored on r GO nanosheet benefited by the coating of N-doped carbon *** design of such an architecture can effectively suppress the agglomeration of nanoparticles with a shortened Li+transfer ***,the high-speed conducting network has been constructed by r GO and N-doped carbon,which exhibits the face-to-face contact with Li Fe0.5Mn0.5PO4nanoparticles,guaranteeing the rapid electron *** profits endow the Li Fe0.5Mn0.5PO4/rGO@C hybrids with a fast charge-discharge ability,e.g.a high reversible capacity of 105 m Ah·g^-1at 10 C,much higher than that of the Li Fe0.5Mn0.5PO4@C nanoparticles(46 mA·h·g^-1).Furthermore,a 90.8%capacity retention can be obtained even after cycling 500 times at 2 *** work gives a new avenue to fabricate transition metal phosphate with superior electrochemical performance for high-power Li-ion batteries.

关键词： Cathode materials high power density Carbon Long cycle life Li-ion batteries

Recent Developments of Transition Metal Compounds-Carbon Hybrid Electrodes for high Energy/power Supercapacitors

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Nano-Micro Letters 2021年第8期13卷 231-262页

作者： Kang Ren Zheng Liu Tong Wei Zhuangjun Fan State Key Laboratory of Heavy Oil Processing School of Materials Science and EngineeringChina University of Petroleum(East China)Qingdao 266580People’s Republic of China

Due to their rapid power delivery,fast charging,and long cycle life,supercapacitors have become an important energy storage technology ***,to meet the continuously increasing demands in the fields of portable electronics,transportation,and future robotic technologies,supercapacitors with higher energy densities without sacrificing high power densities and cycle stabilities are still *** metal compounds(TMCs)possessing high theoretical capacitance are always used as electrode materials to improve the energy densities of ***,the power densities and cycle lives of such TMCs-based electrodes are still inferior due to their low intrinsic conductivity and large volume expansion during the charge/discharge process,which greatly impede their large-scale *** recently,the ideal integrating of TMCs and conductive carbon skeletons is considered as an effective solution to solve the above ***,we summarize the recent developments of TMCs/carbon hybrid electrodes which exhibit both high energy/power densities from the aspects of structural design strategies,including conductive carbon skeleton,interface engineering,and electronic ***,the remaining challenges and future perspectives are also highlighted so as to provide strategies for the high energy/power TMCs/carbon-based supercapacitors.

关键词： TMCs/carbon hybrid Supercapacitors high power density Carbon skeleton Interfacial engineering Transition metal electronic structure

A review of ferroelectric materials for high power devices

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Journal of Materiomics 2022年第4期8卷 739-752页

作者： Sergey I.Shkuratov Christopher S.Lynch Loki Incorporated 1334 Royal RoadNorwoodMO65717USA Bourns College of Engineering University of California at RiversideCA92521USA

Compact autonomous ultrahigh power density energy storage and power generation devices that exploitthe spontaneous polarization of ferroelectric materials are capable of producing hundreds of kilovoltvoltages,multi-kiloampere currents,and megawatt power levels for brief interval of *** storagelife of these devices is four orders of magnitude longer than that for electrochemical batteries andelectrochemical *** is an up to date survey of ferroelectric materials used for these highpower *** types of ferroelectric ceramics possess the ability to be depolarized under adia-batic compression and can be successfully used for high power *** addition to bulk ferro-electric ceramics,multilayer ferroelectric films are very efficient materials for high power *** importance is the ability of relaxor ferroelectric single crystals to produce significantly higherelectric charge density and energy density than ceramics,making them promising materials for highpower *** provided is a brief survey of recent developments of ferroelectric materials forhigh energy density and power density dielectric *** ceramics have been developed,including antiferroelectric and relaxor antiferroelectric solid solutions,providing high energy densityand efficiency simultaneously.

关键词： Energy storage Ferroelectric Antiferroelectric Relaxor high power density

Entropy-modulated and interlayer-doped transition metal layered oxides enable high-energy-density sodium-ion capacitors

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Nano Research 2024年第10期17卷 8785-8793页

作者： Tiansheng Wang Yadong Li Zhengyuan Chen Qingshan Liu Jian Lang Langyuan Wu Wendi Dong Zhengyu Ju Hongsen Li Xiaogang Zhang Guihua Yu College of Physics Qingdao UniversityQingdao 266071China Jiangsu Key Laboratory of Materials and Technologies for Energy Storage College of Materials Science and TechnologyNanjing University of Aeronautics and AstronauticsNanjing 210016China Materials Science and Engineering Program and Walker Department of Mechanical Engineering The University of Texas at AustinAustin 78712USA

In recent years,sodium-ion capacitors have attracted attention due to their cost-effectiveness,high power density and similar manufacturing process to lithium-ion ***,the utilization of oxide electrodes in traditional sodium-ion capacitors restricts their further advancement due to the inherent low operating voltage and electrolyte consumption based on their energy storage *** address these challenges,we incorporated Zn,Cu,Ti,and other elements into Na_(0.67)Ni_(0.33)Mn_(0.67)O_(2) to synthesize P2-type Na_(0.7)Ni_(0.28)Mn_(0.6)Zn_(0.05)Cu_(0.02)Ti_(0.05)O_(2) with a modulated entropy and pillaring *** the synergistic interplay between the interlayer pillar and the entropy modulation within the layers,the material exhibits exceptional toughness,effectively shielding it from detrimental phase transitions at elevated voltage *** a result,the material showcases outstanding kinetic properties and long-term cycling stability across the voltage *** integrating these materials with hierarchical porous carbon nanospheres to form a"rocking chair"sodium-ion capacitor,the hybrid full device delivers a high energy density(171 Wh·kg^(-1))and high power density(5245 W·kg^(-1)),as well as outstanding cycling stability(77% capacity retention after 3000 cycles).This work provides an effective material development route to realize simultaneously high energy and power for next-generation sodium-ion capacitors.

关键词： sodium-ion capacitors entropy modulation high power density long-term cycling layered oxide

Sustainable Lignin-Derived Carbon as Capacity-Kinetics Matched Cathode and Anode towards 4.5 V high-Performance Lithium-Ion Capacitors

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Energy & Environmental Materials 2023年第4期6卷 98-105页

作者： Fangyan Liu Pengfei Lu Ying Zhang Feng Su Liangzhu Zhang Shuanghao Zheng Xiong Zhang Fangyuan Su Yanwei Ma Zhongshuai Wu State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Dalian National Laboratory for Clean Energy Chinese Academy of SciencesDalian 116023China Anhui Key Laboratory of Spin Electron and Nanomaterials School of Chemistry and Chemical EngineeringSuzhou UniversitySuzhou 234000China University of Chinese Academy of Sciences Beijing 100049China CAS Key Laboratory of Carbon Materials Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China School of Engineering Sciences University of Chinese Academy of SciencesBeijing 100049China Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology Qilu ZhongkeJinan 250013China

The Li-ion capacitors(LICs)develop rapidly due to their double-high features of high-energy density and high-power ***,the relative low capacity of cathode and sluggish kinetics of anode seriously impede the development of ***,the precisely pore-engineered and heteroatomtailored defective hierarchical porous carbons(DHPCs)as large-capacity cathode and high-rate anode to construct high-performance dual-carbon LICs have been *** DHPCs are prepared based on triple-activation mechanisms by direct pyrolysis of sustainable lignin with urea to generate the interconnected hierarchical porous structure and plentiful heteroatominduced *** from these advanced merits,DHPCs show the well-matched high capacity and fast kinetics of both cathode and anode,exhibiting large capacities,superior rate capability and long-term *** experimental and computational results demonstrate the strong synergistic effect of pore and dopants for Li ***,the assembled dual-carbon LIC exhibits high voltage of 4.5 V,high-energy density of 208 Wh kg^(−1),ultrahigh power density of 53.4 kW kg^(−1)and almost zerodecrement cycling ***,the full device with high mass loading of 9.4 mg cm^(−2)on cathode still outputs high-energy density of 187 Wh kg^(−1),demonstrative of their potential as electrode materials for high-performance electrochemical devices.

关键词： capacity-kinetics matching defective hierarchical porous carbons high mass loading high power density Li-ion capacitors

Perspectives and challenges for lead-free energy-storage multilayer ceramic capacitors

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Journal of Advanced Ceramics 2021年第6期10卷 1153-1193页

作者： Peiyao ZHAO Ziming CAI Longwen WU Chaoqiong ZHU Longtu LI Xiaohui WANG State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China School of Material Science and Physics China University of Mining and TechnologyXiizhou 221116China College of Electrical Engineering Sichuan UniversityChengdu 610065China

The growing demand for high-power-density electric and electronic systems has encouraged the development of energy-storage capacitors with attributes such as high energy density,high capacitance density,high voltage and frequency,low weight,high-temperature operability,and environmental *** with their electrolytic and film counterparts,energy-storage multilayer ceramic capacitors(MLCCs)stand out for their extremely low equivalent series resistance and equivalent series inductance,high current handling capability,and high-temperature *** characteristics are important for applications including fast-switching third-generation wide-bandgap semiconductors in electric vehicles,5G base stations,clean energy generation,and smart *** have been numerous reports on state-of-the-art MLCC energy-storage ***,lead-free capacitors generally have a low-energy density,and high-energy density capacitors frequently contain lead,which is a key issue that hinders their broad *** this review,we present perspectives and challenges for lead-free energy-storage ***,the energy-storage mechanism and device characterization are introduced;then,dielectric ceramics for energy-storage applications with aspects of composition and structural optimization are *** on state-of-the-art energy-storage MLCCs is discussed after elaboration of the fabrication process and structural design of the *** applications of energy-storage MLCCs are then discussed in terms of advanced pulsed power sources and high-density power converters from a theoretical and technological point of ***,the challenges and future prospects for industrialization of lab-scale lead-free energy-storage MLCCs are discussed.

关键词： multilayer ceramic capacitors(MLCCs) lead-free dielectric ceramics energy storage high power density

Niobium Tungsten Oxide in a Green Water‑in‑Salt Electrolyte Enables Ultra‑Stable Aqueous Lithium‑Ion Capacitors

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Nano-Micro Letters 2020年第12期12卷 106-116页

作者： Shengyang Dong Yi Wang Chenglong Chen Laifa Shen Xiaogang Zhang School of Chemistry and Materials Science Institute of Advanced Materials and Flexible Electronics(IAMFE)Nanjing University of Information Science and TechnologyNanjing 210044People’s Republic of China Jiangsu Key Laboratory of Electrochemical Energy Storage Technologies College of Materials Science and TechnologyNanjing University of Aeronautics and AstronauticsNanjing 210016People’s Republic of China Max Planck Institute for Solid State Research Heisenbergstrasse 170569 StuttgartGermany

Aqueous hybrid supercapacitors are attracting increasing attention due to their potential low cost,high safety and ***,the narrow operating potential window of aqueous electrolyte and the lack of suitable negative electrode materials seriously hinder its future ***,we explore high concentrated lithium acetate with high ionic conductivity of 65.5 mS cm−1 as a green“water-in-salt”electrolyte,providing wide voltage window up to 2.8 *** facilitates the reversible function of niobium tungsten oxide,Nb18W16O93,that otherwise only operations in organic electrolytes *** Nb18W16O93 with lithium-ion intercalation pseudocapacitive behavior exhibits excellent rate performance,high areal capacity,and ultra-long cycling *** aqueous lithium-ion hybrid capacitor is developed by using Nb18W16O93 as negative electrode combined with graphene as positive electrode in lithium acetate-based“water-in-salt”electrolyte,delivering a high energy density of 41.9 W kg−1,high power density of 20,000 W kg−1 and unexceptionable stability of 50,000 cycles.

关键词： Aqueous hybrid capacitors Water-in-salt electrolyte Niobium tungsten oxide Ultra-stability high power density

Recent advances in the synthesis of non-carbon two-dimensional electrode materials for the aqueous electrolyte-based supercapacitors

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Chinese Chemical Letters 2021年第12期32卷 3733-3752页

作者： Hongfei Wang Yijun Zhong Jiqiang Ning Yong Hu Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Department of ChemistryZhejiang Normal UniversityJinhua 321004China Department of Chemical Physics University of Science and Technology of ChinaHefei 230026China Vacuum Interconnected Nanotech Workstation Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China

Supercapacitors(SCs) with high power density and long cycling span life are demanding energy storage devices that will be an attractive power solution to modern electronic and electrical applications. Numerous theoretical and experimental works have been devoted to exploring various possibilities to increase the functionality and the specific capacitance of electrodes for SCs. Non-carbon two-dimensional(2D)materials have been considered as encouraging electrode candidates for their chemical and physical advantages such as tunable surface chemistry, high electronic conductivity, large mechanical strength, more active sites, and dual non-faradaic and faradaic electrochemical performances. Besides, these 2D materials also play particular roles in constructing highway channels for fast ion diffusion. This concise review summarizes cutting-edge progress of some representative 2D non-carbon materials for the aqueous electrolyte-based SCs, including transition metal oxides(TMOs), transition metal hydroxides(TMHs), transition metal chalcogenides(TMCs), MXenes, metal-organic frameworks(MOFs) and some emerging materials. Different synthetic methods, effective structural designs and corresponding electrochemical performances are reviewed in detail. And we finally present a detailed discussion of the current intractable challenges and technical bottlenecks, and highlight future directions and opportunities for the development of next-generation high-performance energy storage devices.

关键词： Supercapacitors 2D non-carbon materials Aqueous electrolyte high power density Long cycling span life