检索结果-南通市图书馆

Rare Metals 2023年第7期42卷 2226-2237页

作者： Peng Liu Zhi-Hao Zhu Wen Zhang Jia-Yi Liu Zhong Su Xin-Hua Liu Shi-Chun Yang Chao Lai School of Chemistry and Materials Science Jiangsu Normal UniversityXuzhou221116China School of Transportation Science and Engineering Beihang UniversityBeijing100191China

The low yield of MXene is normally related to the delaminating step,contributing to the key technical challenges in moving toward industrial applications.Here,a shearing-force-driven strategy is proposed for re-exfoliating waste MXene residue to prepare oxidatively stable MXene composites in a low-cost manner,where the strong shear stress in the assisted solvent,such as carbon nanotubes(CNTs),chitosan(CS),and polyacrylamide(PAM)aqueous solutions,acts on the surface of MXene(Ti_(3)C_(2)T_(x))through coordination between hydroxyl and Ti atoms,resulting in a rapid and efficient exfoliation of waste Ti_(3)C_(2)T_(x)residue under stirring.Furthermore,this formed coordinate bond helps to stabilize the low-valent Ti atoms on the surface of MXene,thereby enhancing the oxidative stability of Ti_(3)C_(2)T_(x).Besides,the CNT@MXene composite is selected to construct a free-standing membrane to encapsulate si nanoparticles,achieving a high and reversible capacity after 50 cycles.This work supports the concept of valorizing waste and adopts a fluid shear forceassisted method to re-exfoliate waste residues,which greatly reduces the cost of processing and improves the chemical stability of MXene.More importantly,this work has uncovered a new direction for the commercialization of MXene composites and has significantly improved the realworld applications of MXene-based materials.

关键词： Waste residue Shear stress MXene composites Oxidatively stable si anode

High-performance si-Containing anode materials in lithium-ion batteries: A superstructure of si@Co-NC composite works effectively

在线全文

学校读者我要写书评

暂无评论

Green Energy & Environment 2022年第1期7卷 116-129页

作者： Qiongguang Li Yanhong Wang Jing Yu Menglei Yuan Qiangqiang Tan Ziyi Zhong Fabing Su School of Chemical Engineering University of Chinese Academy of Sciences100049BeijingChina State Key Laboratory of Multiphase Complex Systems CAS Key Laboratory of Green Process EngineeringInstitute of Process EngineeringChinese Academy of SciencesBeijing100190China Zhongke Langfang Institute of Process Engineering Fenghua Road No 1Langfang Economic&Technical Development ZoneHebei Province065001China College of Engineering Guangdong Technion Israel Institute of Technology(GTIIT)241 Daxue RoadJinping DistrictShantou515063China Technion Israel Institute of Technology(IIT) Haifa32000Israel Institute of Industrial Chemistry and Energy Technology Shenyang University of Chemical TechnologyShenyang110142China

To mitigate the massive volume expansion of si-based anode during the charge/discharge cycles,we synthesized a superstructure of si@Co±NC composite via the carbonization of zeolite imidazolate frameworks incorporated with si nanoparticles.The si@Co±NC is comprised of sinanoparticle core and N-doped/Co-incorporated carbon shell,and there is void space between the core and the shell.When using as anode material for LIBs,si@Co±NC displayed a super performance with a charge/discharge capacity of 191.6/191.4 mA h g^(-1)and a coulombic efficiency of 100.1%at 1000 mA g^(-1)after 3000 cycles,and the capacity loss rate is 0.022%per cycle only.The excellent electrochemical property of si@Co±NC is because its electronic conductivity is enhanced by doping the carbon shell with N atoms and by incorporating with Co particles,and the pathway of lithium ions transmission is shortened by the hollow structure and abundant mesopores in the carbon shell.Also,the volume expansion of si nanoparticles is well accommodated in the void space and suppressed by the carbon host matrix.This work shows that,through designing a superstructure for the anode materials,we can synergistically reduce the work function and introduce the confinement effect,thus significantly enhancing the anode materials’electrochemical performance in LIBs.

关键词： Confinement effect Work function regulation Doping Hollow core-shell structure si anode

Carbon polyhedra encapsulated si derived from Co-Mo bimetal MOFs as anode materials for lithium-ion batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第28期159卷 91-98页

作者： Huan Ruan Lifeng Zhang Shuai Li Kai Wang Wenhuan Huang Shouwu Guo School of Materials Science and Engineering Shaanxi University of Science and TechnologyXi’an 710021China College of Chemistry and Chemical Engineering Shaanxi University of Science and TechnologyXi’an 710021China School of Electronic Information and Electrical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

silicon(si)holds promise as an anode material for lithium-ion batteries(LIBs)as it is widely avail-able and characterized by high specific capacity and suitable working potential.However,the relatively low electrical conductivity of si and the significantly high extent of volume expansion realized dur-ing lithiation hinder its practical application.We prepared N-doped carbon polyhedral micro cage en-capsulated si nanoparticles derived from Co-Mo bimetal metal-organic framework(MOFs)(denoted as si/CoMo@NCP)and explored their lithium storage performance as anode materials to address these prob-lems.The si/CoMo@NCP anode exhibited a high reversible lithium storage capacity(1013 mAh g^(−1)at 0.5 A g^(−1)after 100 cycles),stable cycle performance(745 mAh g^(−1)at 1 A g^(−1)after 400 cycles),and excellent rate performance(723 mAh g^(−1)at 2 A g^(−1)).Also,the constructed the full-cell NCM 811//si/CoMo@NCP exhibited well reversible capacity.The excellent electrochemical performances of si/CoMo@NCP were at-tributed to two unique properties.The encapsulation of NCP with doped nitrogen and porous structural carbon improves the electrical conductivity and cycling stability of the molecules.The introductions of metallic cobalt and its oxides help to improve the rate capability and lithiation capacity of the materials following multi-electron reaction mechanisms.

关键词： si anode Carbon polyhedra Cobalt/molybdenum double doping Lithium-ion batteries Electrochemical property

Coil-to-Stretch Transition of Binder Chains Enabled by“Nano-Combs”to Facilitate Highly Stable siO_(x) anode

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Energy & Environmental Materials 2022年第4期5卷 1310-1316页

作者： Shida Xue Yanda Fu Zhibo Song Shiming Chen Yuchen Ji Yan Zhao Huizhi Wang Guoyu Qian Luyi Yang Feng Pan s.xue y.fuz.songs.cheny.jidr.7.qianpro6.l.yangpro6.6.pan school of advanced materialspeking university shenzhen graduate schoolshenzhen 518055china department of mechanical engineering imperial college londonlondon sw72bxuk

The commercialized binder carboxymethyl cellulose sodium(CMC-Na)is considered unsuitable for micro-sized siO_(x) anode as it cannot endure the large volume change to retain the conductive network during repeated charge/discharge cycles.Herein,a small amount of silicon nanoparticles(siNPs)is added during slurry preparation process as“nano-combs”to unfold the convoluted CMC-Na polymer chains so that they undergo a coilto-stretch transition by interaction between polar groups(e.g.,-OH,-COONa)of polymer and siNPs’large surface.Through maximizing the utilization of binders,a uniform conductive network is constructed with increased interfacial contact with micro-sized siO_(x).As a result,the siO_(x) electrode with optimized(10 wt%)siNPs addition shows significantly improved initial capacity and cycling performance.Through revisiting CMCNa,a currently deemed unqualified binder in siO_(x) anode,this work gives a brand-new perspective on the failing mechanism of si-based anode materials and an improving strategy for electrode preparation.

关键词： binding network CMC-Na lithium-ion batteries si anode siO_(x)anode

An Advanced Design Concept of Mansion-like Freestanding silicon anodes with Improved Lithium Storage Performances

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2022年第5期41卷 55-62页

作者： Deqing Zhang Junfeng Ren Caixia Li Bin Luo Lei Wang Yanyan Li State Key Laboratory Base of Eco-chemical Engineering Taishan Scholar Advantage and Characteristic Discipline Team of Eco-chemical Process and TechnologyQingdao University of Science and TechnologyQingdao 266042China College of Chemical Engineering Qingdao University of Science and TechnologyQingdao 266042China College of Environment and Safety Engineering Qingdao University of Science and TechnologyQingdao 266042China Nanomaterials Centre School of Chemical Engineering and Australian Institute for Bioengineering and NanotechnologyThe University of QueenslandSt LuciaQLD 4072Australia

To conquer inherently low conductivity,volume swelling,and labile solid electrolyte interphase(SEI)films of si anode in lithium ion battery(LIBs),it is widely accepted that appropriate structure design of si-C hybrids performs effectively,especially for nanosize si particles.Herein,inspired by the sturdy construction of high-rise buildings,a mansion-like 3D structured si@siO_(2)/PBC/RGO(SSPBG)with separated rooms is developed based on 0D core-shell si@siO_(2),1D pyrolytic bacterial cellulose(PBC)and 2D reduced graphene oxide(RGO).Therefore,these hierarchical protectors operate synergistically to inhibit the inevitable volume changes during electrochemical process.Specifically,tightly coated siO_(2)shell as the first protective layer could buffer the volume expansion and reduce detrimental pulverization of si NPs.Furthermore,flexible spring-like PBC and ultra-fine RGO sheets perform as securer barriers and skeleton which will counteract the microstructure strain and accelerate electron transfer at the same time.Remarkably,the self-supporting electrode realizes a distinguished performance of 901 mAh g^(-1)at 2 A g^(-1)for 500 cycles.When matched with LiFePO4 cathodes,high stability of more than 100 cycles has been realized for the full batteries.

关键词： si anode bacterial cellulose graphene 3D conductive network binder-free lithium-ion battery

基于多尺度图像重建的硅负极结构演化定量分析

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2023年第4期68卷 408-416,M0004页

作者：朱晨陈诗名李珂尹祖伟肖荫果林海潘锋杨卢奕 School of Advanced Materials Peking University Shenzhen Graduate SchoolShenzhen 518055China College of Energy Xiamen UniversityXiamen 361005China

为了深入了解硅基负极在循环过程中的结构演化,本文首次应用电极和颗粒水平多尺度的三维图像重建技术,对微米硅负极在电循环过程中的结构进行了可视化的定量表征;通过分析电解液中氟代碳酸乙烯酯(FEC)添加剂的影响,生动展示了硅负极的结... 详细信息

为了深入了解硅基负极在循环过程中的结构演化,本文首次应用电极和颗粒水平多尺度的三维图像重建技术,对微米硅负极在电循环过程中的结构进行了可视化的定量表征;通过分析电解液中氟代碳酸乙烯酯(FEC)添加剂的影响,生动展示了硅负极的结构/成分演变与电化学性能之间的联系.利用聚焦离子束和扫描电子显微镜(FIB-SEM)技术,对电极中的三种组分(硅活性颗粒,非活性组分和孔隙)的体积和形状变化进行了定量的分析,并统计了循环过程中硅颗粒的平均尺寸.结合电化学分析结果表明,电解液FEC添加剂可以在硅负极的循环早期形成稳定的固态电解质界面(SEI),从而有效抑制硅颗粒的巨大体积膨胀和粉化现象,提高电极的循环稳定性.本文提出的方法为具有类似体积膨胀问题的电极体系提供了新的研究视角.

关键词： Li-ion battery si anode Structural evolution Three-dimensional image reconstruction

Promoting si-graphite composite anodes with SWCNT additives for half and NCM 811 full lithium ion batteries and assessment criteria from an industrial perspective

在线全文

学校读者我要写书评

暂无评论

Frontiers in Energy 2019年第4期13卷 626-635页

作者： Jingning SHAN Xiaofang YANG Chao YAN Lin CHEN Fang ZHAO Yiguang JU Department of Mechanical and Aerospace Engineering Princeton University HiT Nano IncPrinceton 08540USA Department of Mechanical and Aerospace Engineering Princeton UniversityPrinceton NJ 08544USA Department of Mechatronics Engineering College of Mechanical EngineeringGuangxi UniversityNanning 530004China Department of Physics Princeton UniversityPrinceton NJ 08544USA

single wall carbon nanotube(SWCNT)additives were formulated into(im-si-graphite composite electrodes and tested in both half cells and full cells with high nickel cathodes.The critical role of small amount of SWCNT addition(0.2 wt%)was found for significantly improving delithiation capacity,first cycle coulombic efficiency(FCE),and capacity retention.Particularly,si(10 wt%)-graphite electrode exhibits 560 mAh/g delithiation capacity and 92%FCE at 0.2 C during the first chargedischarge cycle,and 91%capacity retention after 50 cycles(0.5 C)in a half cell.Scanning electron microscope(SEM)was used to illustrate the electrode morphology,compositions and promoting function of the SWCNT additives.In addition,full cells assembled with high nickel-NCM811 cathodes and fim-si-graphite composite anodes were evaluated for the consistence between half and full cell performance,and the consideration for potential commercial application.Finally,criteria to assess si-containing anodes are proposed and discussed from an industrial perspective.

关键词： lithium-ion battery si anode si-graphite composite single wall carbon nanotube(SWCNT) NCM811

Small Things Make a Big Difference: the Small-molecule Cross-linker of Robust Water-soluble Network Binders for Stable si anodes

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2021年第2期37卷 304-310页

作者： WANG Dong LI Zhenwei ZHANG Qian LIU Jie YANG Yu HAN Jishu WANG Lei State Key Laboratory Base of Eco-chemical Engineering Taishan Scholar Advantage and Characteristic Discipline Team of Eco-chemical Process and TechnologyQingdao University of Science and TechnologyQingdao266042P.R.China College of Chemical Engineering Qingdao University of Science and TechnologyQingdao266042P.R.China College of Chemistry and Molecular Engineering Qingdao University of Science and TechnologyQingdao266042P.R.China Shandong Engineering Research Center for Marine Environment Corrosion and Safety Protection College of Environment and Safety EngineeringQingdao University of Science and TechnologyQingdao266042P.R.China

silicon(si)with high theoretical capacity has attracted tremendous attention as the next-generation anode material for Li-ion batteries,but the huge expansion during cycling restricts its practical application.Designing a low-cost,accessible robust network binder is a facile and effective approach to suppress the volume change effect and achieve the commercial application of si anodes.Different previous studies focused on the network binder macromolecule main chain,this manuscript pays attention to the study of small-molecule cross-linker.Herein,cross-linked network binders using alginate acid and two kinds of cross-linkers,i.e.,D-sorbitol and isosorbide(Alg-DS and Alg-IS binders)are synthesized.It was found that not only the chemical structure of the cross-linker but also the physicochemical property,such as melting point affect greatly the mechanical properties of the network binder.As a result,the si anode with an Alg-DS binder dried below the melting point of DS shows the best cycling stability with a high capacity of 2249.8 mA·h/g and a retention rate as high as 95.9%after 100 cycles.This study gives a new view to design robust network binders for stable si anodes.

关键词： Li-ion battery si anode Network binder Cross-linker

Polydopamine-mediated synthesis of si@carbon@graphene aerogels for enhanced lithium storage with long cycle life

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2021年第12期32卷 3787-3792页

作者： Ningning Li Yi Liu Xiaoyu Ji Jiaxin Feng Kai Wang Jiayue Xie Guanglu Lei Xianghong Liu Xiangxin Guo Jun Zhang College of Physics Qingdao UniversityQingdao 266071China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China

The application of si as the anode materials for lithium-ion batteries(LIBs) is still severely hindered by the rapid capacity decay due to the structural damage caused by large volume change(> 300%) during cycling. Herein, a three-dimensional(3 D) aerogel anode of si@carbon@graphene(SCG) is rationally constructed via a polydopamine-assisted strategy. Polydopamine is coated on si nanoparticles to serve as an interface linker to initiate the assembly of si and graphene oxide, which plays a crucial role in the successful fabrication of SCG aerogels. After annealing the polydopamine is converted into N-doped carbon(N-carbon) coatings to protect si materials. The dual protection from N-carbon and graphene aerogels synergistically improves the structural stability and electronic conductivity of si, thereby leading to the significantly improved lithium storage properties. Electrochemical tests show that the SCG with optimized graphene content delivers a high capacity(712 m Ah/g at 100 m A/g) and robust cycling stability(402 m Ah/g at 1 A/g after 1500 cycles). Furthermore, the full cell using SCG aerogels as anode exhibits a reversible capacity of 187.6 m Ah/g after 80 cycles at 0.1 A/g. This work provides a plausible strategy for developing si anode in LIBs.

关键词： si anode Carbon coating Graphene Aerogel Cycle life