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Journal of Renewable Materials 2024年第2期12卷 259-274页

作者： Lianyuan Ji Mingchen Shi Zengkai Feng Hui Yang College of Materials Science and Engineering Nanjing Tech UniversityNanjing211816China Department of Design Huadingju Engineering Co.Ltd.Tianjin300041China

Cobalt sulphides attract much attention as anode materials for Li-ion batteries(LIBs).However,its poor conductivity,low initial column efficiency and large volume changes during cycling have hindered its further ***,novel interlaced CoS nanosheets were firstly prepared on carbon Fiber Cloth(CFC)by two hydrothermal reactions followed with carbon coating via carbonizing dopamine(CoS NS@C/CFC).As a freestanding anode,the nanosheet structure of CoS not only accommodates the volume variation,but also provides a large interface area to proceed the charge transfer *** addition,CFC works as both a three-dimensional skeleton and an active substance which can further improve the areal capacity of the resulting ***,the coated carbon combined with the CFC work as a 3D conductive network to facilitate the electron *** obtained CoS NS@C/CFC,and the contrast sample prepared with the same procedure but without carbon coating(CoS NS/CFC),are characterized with XRD,SEM,TEM,XPS and electrochemical *** results show that the CoS NS@C/CFC possesses much improved electrochemical performance due to the synergistic effect of nanosheet CoS,the coated carbon and the CFC substrate,exhibiting high initial columbic efficiency(~87%),high areal capacity(2.5 at 0.15 mA cm−2),excellent rate performance(1.6 at 2.73 mA cm−2)and improved cycle stability(87.5%capacity retention after 300 cycles).This work may provide a new route to explore freestanding anodes with high areal specific capacity for LIBs.

关键词： Lithium-ion battery cobalt sulfide carbon coating carbon fiber cloth freestanding anode

Simultaneously enhancing the electronic and ionic conductivities of Li_(2)ZnTi_(3)O_(8)via modification with polyacrylonitrile-derived carbon for high-performance anodes

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ChemPhysMater 2023年第1期2卷 43-51页

作者： Yujun Bai Jiali Qin Jiaxuan Cai Huiling Zhu Tao Li Yanxiang Wang Yongxin Qi Key Laboratory of Liquid-Solid Structural Evolution and Processing of Materials of Ministry of Education State Key Laboratory of Crystal MaterialsShandong UniversityJinan 250061China School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China

Polyacrylonitrile(PAN)with C≡N bonds can be converted to nitrogen-doped carbon during carbonization,which enhances electronic conductivity by compensating for the deficiency of the Li_(2)ZnTi_(3)O_(8)(LZTO)*** this study,LZTO was modified by carbonizing a homogeneous PAN/LZTO powder mixture at approximately 800℃for 5 h in nitrogen stream to uniformly coat nitrogen-doped carbon around the LZTO particles and to yield nitrogen-doped ***-60 exhibited a capacity retention of 74.8%as the current density increased from 0.1 to 1.6 A g−1,and had charge/discharge capacities of 250.1/250.8 mAh g−1 even after 1100 cycles at 0.5 A g−*** and compositional analysis along with electrochemical tests showed that the uniform nitrogen-doped carbon coating and the nitrogen-doped LZTO favor electron transfer,while the defects induced by nitrogen-doping in LZTO promote Li-ion *** enhanced electronic and ionic conductivities are favorable to alleviate the polarization during cycling,and thus are responsible for the optimized performance.

关键词： Conductivity Polyacrylonitrile Li_(2)ZnTi_(3)O_(8) carbon coating N-doping

Visible light-responsive carbon-decorated p-type semiconductor CaFe_2O_4 nanorod photocatalyst for efficient remediation of organic pollutants

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Chinese Journal of Catalysis 2017年第10期38卷 1770-1779页

作者： Xin Liu Yuhong Zhang Yushuai Jia Junzhe Jiang Yabin Wang Xiangshu Chen Tian Gui College of Chemistry and Chemical Engineering Jiangxi Inorganic Membrane Materials Engineering Research Centre Jiangxi Normal UniversityNanchang 330022 JiangXi China

We report the fabrication and photocatalytic property of a composite of C/CaFe2O4nanorods(NRs)in an effort to reveal the influence of carbon *** is demonstrated that the photocatalytic degradation activity is dependent on the mass ratio of C to *** optimal carbon content is determined to be58wt%to yield a methylene blue(MB)degradation rate of0.0058min.1,which is4.8times higher than that of the pristine *** decoration of carbon on the surface of CaFe2O4NRs improves its adsorption capacity of the MB dye,which is specifically adsorbed on the surface as a monolayer according to the adsorption isotherm *** trapping experiments of the reactive species indicate that superoxide radicals(.O2)are the main active species responsible for the removal of MB under visible‐light ***,the unique feature of carbon coating enables the efficient separation and transfer of photogenerated electrons and holes,strengthens the adsorption capacity of MB,and improves the light harvesting capability,hence enhancing the overall photocatalytic degradation of MB.

关键词： p‐type semiconductor CaFe2O4 carbon coating Nanorod Composite photocatalyst Degradation of methylene blue

High-performance SiO/C as anode materials for lithium-ion batteries using commercial SiO and glucose as raw materials

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Rare Metals 2021年第5期40卷 1110-1117页

作者： Zi-Long Wu Shan-Bao Ji Lie-Kai Liu Tian Xie Long Tan Hao Tang Run-Guang Sun School of Materials Science and Engineering Nanchang UniversityNanchang 330031China

Silicon monoxide(SiO)is considered as a promising anode material for lithium-ion batteries(LIBs)due to its higher capacity and longer cycle life than those of graphite and silicon,*** this study,glucose was developed as a suitable and inexpensive carbon source to synthesize SiO/C composite with a high *** addition,the effects of the calcination temperature and the amount of c arbon source on the electrochemical performance of the SiO/C composite were *** addition of 5 wt%glucose and a calcination temperature of 800℃ demonstrated the optimum conditions for SiO/C *** resultant SiO/C showed an initial charge capacity of 1259 mAh·g^(-1) and a high initial coulombic efficiency of 71.9%.A charge capacity of 850 mAh·g^(-1) after 100 cycles at 200 mA·g^(-1) was achieved,demonstrating the best value of the SiO/C-based *** composition changes of SiO under the calcination temperature played a significant role in the electrochemical ***,the obtained SiO/C material with a high capacity and good stability is suitable for LIB applications as an anode material.

关键词： Lithium-ion battery Anode material Silicon monoxide Glucose carbon coating SiO/C

Flower-like C@SnOx@C hollow nanostructures with enhanced electrochemical properties for lithium storage

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Nano Research 2017年第9期10卷 2966-2976页

作者： Yijia Wang Zheng Jiao Minghong Wu Kun Zheng Hongwei Zhang Jin Zou Chengzhong Yu Haijiao Zhang Institute of Nanochemistry and Nanobiology Shanghai University Shanghai 200444 China School of Environmental and Chemical Engineering Shanghai University Shanghai 200444 China Materials Engineering and Centre for Microscopy and Microanalysis The University of Queensland Brisbane OLD 4072 Australia Australian Institute for Bioengineering and Nanotechnology The University of Queensland Brisbane QLD 4072 Australia

Hollow nanostructures have attracted considerable attention owing to their large surface area, tunable cavity, and low density. In this study, a unique flower-like C@SnO X @C hollow nanostructure (denoted as C@SnO X @C-1) was synthesized through a novel one-pot approach. The C@SnO X @C-1 had a hollow carbon core and interlaced petals on the shell. Each petal was a SnO2 nanosheet coated with an ultrathin carbon layer ~2 nm thick. The generation of the hollow carbon core, the growth of the SnO2 nanosheets, and the coating of the carbon layers were simultaneously completed via a hydrothermal process using resorcinol-formaldehyde resin-coated SiO2 nanospheres, tin chloride, urea, and glucose as precursors. The resultant architecture with a large surface area exhibited excellent lithium-storage performance, delivering a high reversible capacity of 756.9 mA·h·g–1 at a current density of 100 mA·g–1 after 100 cycles.

关键词： C@SnO_X@C hollow nanostructure nanosheets carbon coating anodes

Stabilizing porous micro-sized silicon anodes via construction of tough composite interface networks for high-energy-density lithium-ion batteries

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Nano Research 2024年第11期17卷 9737-9745页

作者： Lin Sun Yang Liu Liyan Wang Zhidong Chen Zhong Jin Key Laboratory for Advanced Technology in Envirnmental Protection of Jiangsu Province School of Chemistry and Chemical Engineering Yancheng Institute of Technology Yancheng 224051 China School of Petrochemical Engineering Changzhou University Changzhou 213164 China State Key Laboratory of Coordination Chemistry MOE Key Laboratory of Mesoscopic Chemistry MOE Key Laboratory of High Performance Polymer Materials and Technology Jiangsu Key Laboratory of Advanced Organic Materials School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 China

Compared to nanostructured Si/C materials, micro-sized Si/C anodes for lithium-ion batteries (LIBs) have gained significant attention in recent years due to their higher volumetric energy density, reduced side reactions and low costs. However, they suffer from more severe volume expansion effects, making the construction of stable micro-sized Si/C anode materials crucial. In this study, we proposed a simple wet chemistry method to obtain porous micro-sized silicon (μP-Si) from waste AlSi alloys. Then, the μP-Si@carbon nanotubes (CNT)@C composite anode with high tap density was prepared by wrapping with CNT and coated with polyvinylpyrrolidone (PVP)-derived carbon. Electrochemical tests and finite element (FEM) simulations revealed that the introduction of CNTs and PVP-derived carbon synergistically optimize the stability and overall performance of the μP-Si electrode via construction of tough composite interface networks. As an anode material for LIBs, the μP-Si@CNT@C electrode exhibits boosted reversible capacity (∼ 3500 mAh·g^(−1) at 0.2 A·g^(−1)), lifetime and rate performance compared to pure μP-Si. Further full cell assembly and testing also indicates that μP-Si@CNT@C is a highly promising anode, with potential applications in future advanced LIBs. It is expected that this work can provide valuable insights for the development of micro-sized Si-based anode materials for high-energy-density LIBs.

关键词： micro silicon anode carbon coating carbon nanotube lithium-ion battery

Facile fabrication of integrated three-dimensional C- MoSe2/reduced graphene oxide composite with enhanced performance for sodium storage

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Nano Research 2016年第6期9卷 1618-1629页

作者： Dong Xie Wangjia Tang Yadong Wang Xinhui Xia Yu Zhong Ding Zhou DonghuangWang Xiuli Wang Jiangping Tu State Key Laboratory of Silicon Materials Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province and School of Materials Science and Engineering Zhejiang University Hangzhou 310027 China School of Engineering Nanyang Polytechnic 569830 Singapore

Scrupulous design and fabrication of advanced electrode materials are vital for developing high-performance sodium ion batteries. Herein, we report a facile one-step hydrothermal strategy for construction of a C-MoSe2/rGO composite with both high porosity and large surface area. Double modification of MoSe2 nanosheets is realized in this composite by introducing a reduced graphene oxide （rGO） skeleton and outer carbon protective layer. The MoSe2 nanosheets are well wrapped by a carbon layer and also strongly anchored on the interconnected rGO network. As an anode in sodium ion batteries, the designed C-MoSe2/rGO composite delivers noticeably enhanced sodium ion storage, with a high specific capacity of 445 mAh-g-1 at 200 mA.g-1 after 350 cycles, and 228 mAh-g 1 even at 4 A.g-1; these values are much better than those of C-MoSe2 nanosheets （258 mAh.g-a at 200 mA-g-1 and 75 mAh-g-1 at 4 A.g-~）. Additionally, the sodium ion storage mechanism is investigated well using ex situ X-ray diffraction and transmission electron microscopy methods. Our proposed electrode design protocol and sodium storage mechanism may pave the way for the fabrication of other high-performance metal diselenide anodes for electrochemical energy storage.

关键词： molybdenum diselenide double modification carbon coating graphene skeleton sodium ion storage

Pressure-induced growth of coralloid-like FeF_(2) nanocrystals to enable high-performance conversion cathode

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Journal of Energy Chemistry 2023年第4期79卷 291-300页

作者： Yulin Xu Wenjing Xiong Jiaqi Huang Xinglin Tang Hongqiang Wang Wei Liu Dan Xiao Yong Guo Yongzhi Zhang Institute of New Energy and Low-carbon Technology(INELT) Sichuan UniversityChengdu 610065SichuanChina Guangxi Key Laboratory of Low carbon Energy Material Guangxi Normal UniversityGuilin 541004GuangxiChina College of Chemistry Sichuan UniversityChengdu 610065SichuanChina Yibin Industrial Technology Research Institute of Sichuan University Yibin 644000SichuanChina

Fluoride ferrous(FeF_(2))is viewed as a promising conversion cathode material for next-generation lithiumion batteries(LIBs)due to its high theoretical specific capacity and low ***,issues such as poor intrinsic conductivity,iron dissolution,and phase separation hinder the application of FeF_(2)in highenergy ***,a pressure-induced morphology control method is designed to prepare coralloidlike FeF_(2)nanocrystals with nitrogen-rich carbon coating(c-FeF_(2)@NC).The coralloid-like interconnected crystal structure of c-FeF_(2)@NC contributes to reducing interfacial resistance and enhancing the topotactic transformation during the conversion reaction,and the nitrogen-rich carbon(NC)coating can enhance interfacial stability and kinetic *** used as a conversion cathode for LIBs,c-FeF_(2)@NC exhibits a high initial reversible capacity of 503.57 mA h g^(-1)and excellent cycling stability of497.61 m A h g^(-1)with a low capacity decay of 1.19%over 50 cycles at 0.1 A/*** at 1 A/g,a stable capacity of 263.78 mA h g^(-1)can still be retained after 200 *** capability of c-FeF_(2)@NC as a conversion cathode for sodium-ion batteries(SIBs)was also evaluated to expand its field of ***,two kinds of full batteries have been assembled by employing c-FeF_(2)@NC as cathodes and quantitative limited-Li(LLi)and pre-lithiated reduced graphene oxide(PGO)as anodes,respectively,to envisage the feasibility of practical applications of conversion materials.

关键词： Conversion cathode carbon coating Coralloid-like FeF_(2) Pressure-induced growth

Preparation and Electrochemical Performance of V2O3-C Dual-Layer Coated LiFePO4 by Carbothermic Reduction of V2O5

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Chinese Journal of Chemical Physics 2015年第3期28卷 331-337,I0002页

作者： You-liang Wei Hong-fa Xiang School of Materials Science and Engineering Hefei University of Technology Hefei 230009 China

The V2O3-C dual-layer coated LiFePO4 cathode materials with excellent rate capability and cycling stability were prepared by carbothermic reduction of V2O5. X-ray powder diffraction, elemental analyzer, high resolution transmission electron microscopy and Raman spectra revealed that the V2O3 phase co-existed with carbon in the coating layer of LiFePO4 particles and the carbon content reduced without graphitization degree changing after the carbothermic reduction of V205. The electrochemical measurement results indicated that small amounts of V203 improved rate capability and cycling stability at elevated temperature of LiFePO4/C cathode materials. The V203-C dual-layer coated LiFePO4 composite with lwt% vanadium oxide delivered an initial specific capacity of 167 mAh/g at 0.2 C and 129 mAh/g at 5 C as well as excellent cycling stability. Even at elevated temperature of 55 ℃, the specific capacity of 151 mAh/g was achieved at 1 C without capacity fading after 100 cycles.

关键词： Lithium iron phosphate Vanadium oxide carbon coating Li-ion battery

Exploring a particle-size-reduction strategy of YAG:Ce phosphor via a chemical breakdown method

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Journal of Rare Earths 2021年第8期39卷 938-945页

作者： Hongren Chen Licheng Ju Li Zhang Xin Wang Linbo Zhang Xin Xu Lin Gao Kehui Qiu Liangjun Yin School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China College of Materials and Chemistry&Chemical Engineering Chengdu University of TechnologyChengdu 610059China Department of Materials Science and Engineering University of Central FloridaOrlando 32816USA National Engineering Research Center of Electromagnetic Radiation Control Materials University of Electronic Science and Technology of ChinaChengdu 6U731China Laboratory of Materials for Energy Conversion Department of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China CNBM(Hefei)Powder Technology Equipment CO. Ltd.Hefei Cement Research&Design InstituteHefei 230026China

Particle size reduction of Y_(3)Al_(5)O_(12):Ce(YAG:Ce) phosphor is highly needed for micro-LED display *** this work,size control of YAG:Ce phosphor particles is achieved via carbon coating and further heat treatment.A thin layer of carbon is deposited on the surface of YAG:Ce by chemical vapor *** the heat treatment,carbon reacts with oxygen element in the phosphor and escapes from phosphor *** reaction results in the phosphor breaking into smaller *** phosphors were characterized by laser light scattering for particle size distribution,scanning electron microscopy(SEM),transmission electron microscopy for morphologies,X-ray diffraction refinements for crystal structure and electron energy-loss spectroscopy for elemental *** is demonstrated that the median diameter(D_(50)) of the phosphor particle size is significantly reduced from 19.1 to 0.96 μm yet the photoluminescent properties have little *** carbon coating and further heat treatment method show potential application in size control of phosphors.

关键词： Y_(3)Al_(5)O_(12):Ce phosphor Particle size reduction carbon coating Rare earths