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Electrocatalytic performance of CNTs/graphene composited rare earth phthalocyanines(M=La,Y,Yb,Sc)

Journal of Rare Earths 2024年第2期42卷 323-333,I0004页

作者： Tingting Jiang Caixia Ou Luyi Wang Jun Chen sydorov dmytro Qian Zhang Jintian Luo Hua Wang Jiangxi Key Laboratory of Power Batteries and Materials Faculty of Materials Metallurgy and ChemistryJiangxi University of Science and TechnologyGanzhou341000China Joint Department of Electrochemical Energy Systems Institute of Bioorganic Chemistry and PetrochemistryNational Academy of Sciences of Ukraine38A VernadskyAveKiev03142Ukraine Guangdong Jiana Energy Technology Co. Ltd.Qingyuan511500China

In this study,a class of rare earth composite sandwich phthalocyanines(MPcs,M=La,Y,Yb,Sc) were prepared and compounded with graphene and carbon nanotubes to obtain MPc/Gr and MPc/CNTs *** electrocatalytic behaviors of MPc/Gr and MPc/CNTs electrodes were further *** results show that the central rare earth metal has a large influence on the electrocatalytic *** the MPcs/Gr samples,ScPc with the smallest ionic radius and molecular size can be more uniformly dispersed in graphene,and the hydrogen precipitation overpotential of ScPc/Gr electrode is514 mV,corresponding to a Tafel slope of 148 mV/dec,with better electrocatalytic performance than other rare earth metal *** for the MPc/CNTs composites,LaPc,which has the largest ionic radius and molecular size,is more uniformly dispersed on the surface of CNTs,so that the LaPc/CNT electrode exhibits the best LSV performance with the smallest corresponding Tafel slope(176 mV/dec).The main reason is the different binding modes of MPcs molecules in Gr and *** rare earth phthalocyanine is combined with layered graphene,the smallest size of rare earth phthalocyanine(ScPc)is more easily embedded in the graphene layer,resulting in better homogeneity of the composite,larger effective contact area and better electrocatalytic *** contrast,when rare earth phthalocyanine is bound to carbon nanotubes in a tubular structure,it is mainly bound by attaching to the surface or being entangled by the carbon *** this case,the rare-earth phthalocyanine molecules(LaPc)with larger layer spacing can provide more contact area with CNTs,forming a more uniform and effective composite,which eventually provides more active sites and better electrocatalytic performance.

关键词： Electrocatalysis Rare earth phthalocyanines Graphene(Gr) Carbon nanotubes(CNTs) Composite

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Auxiliary ball milling to prepare WS_(2)/graphene nanosheets composite for lithium-ion battery anode materials

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Tungsten 2024年第1期6卷 124-133页

作者： Yong-Lin Wu Jia-Bin Hong Wei-Xu Zhong Chun-Xiang Wang Zhi-Feng Li sydorov dmytro Jiangxi Provincial Key Laboratory of Power Batteries and Materials Jiangxi University of Science and TechnologyGanzhou 341000China Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou 341000China Institute of Bioorganic Chemistry and Petrochemistry National Academy of Sciences of UkraineKiev 02160Ukraine

A novel nano-WS_(2)/graphene nanosheets(GNSs)composite is obtained by ball milling with xylitol as auxiliary agent and hightemperature *** improves the shear force during ball milling and well overcomes the van der Waals interactions between the interlayer of graphite and WS_(2).Through high-temperature calcination,GNSs and WS_(2) nanosheets can form tight interface *** produced WS_(2)/GNSs composites can be used as anode materials for lithium-ion batteries,while maintaining a high reversible specific capacity of 705 mAh·g^(-1)with the capacity retention of 95%at a current density of 250 mA·g^(-1)after 200 cycles,mainly because WS_(2)/GNSs composites have a higher Li^(+)diffusion coefficient of 2.2×10^(-9)cm^(2)·s^(-1)and a higher specific surface area of 70.10 m^(2)·g^(-1).As a result,the xylitol-assisted ball milling method designed in this work is suitable for extended preparation of peeling of two-dimensional layer materials into nanosheets.

关键词： Lithium-ion battery Anode material WS_(2) Graphene nanosheets Auxiliary ball milling

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Engineering layered/spinel heterostructure via molybdenum doping towards highly stable Li-rich cathodes

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Tungsten 2022年第4期4卷 323-335页

作者： Kun-Qi Geng Meng-Qian Yang Jun-Xia Meng Ling-Fei Zhou Yu-Qin Wang sydorov dmytro Qian Zhang Sheng-Wen Zhong Quan-Xin Ma Key Laboratory of Power Battery and Materials Faculty of Materials Metallurgy and ChemistryJiangxi University of Science and TechnologyGanzhou341000China School of Physics and Electronics Gannan Normal UniversityGanzhou341000China

Li-rich layered oxide(LLO),e.g.,Li_(1.12)[Mn_(0.56)Ni_(0.16)Co_(0.08)]O_(2)(LRMO),is considered as a promising cathode material due to its superior Li-storage ***,the poor cycling stability and large voltage decay,which are related to the phase transition,limit its industrialization ***,a Mo-doped LRMO(Li_(1.12)[Mn_(0.56)Ni_(0.16)Co_(0.08)]_(0.98)Mo_(0.02)O_(2),LRMO-Mo2.0%)was successfully synthesized via a simple combination of co-precipitation with high-temperature calcination for solving the mentioned *** with the pristine counterpart,the as-prepared LRMO-Mo2.0%shows more excellent electrochemical performance in terms of rate capability(reversible capacity of 118 mA·h·g^(−1) at 5 C),cyclic ability(94.3%capacity retention after 100 cycles at 0.2 C)and discharge midpoint voltage decay(0.11 V after 100 cycles).Systematic investigation of structural evolution and electrochemical kinetics elucidate that the synergic effect of robust oxygen framework and layered/spinel heterostructure is the key to its performance *** synergy helps to stabilize the layered structure by curbing the structural transformation and oxygen escaping during the electrochemical *** work paved the way for the simple and efficient preparation of highly stable LLO cathode materials.

关键词： Li-rich layered oxide Mo doping Layered/spinel heterostructure High rate performance Cycling stability

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LiClO_(4)预氧化Ni_(0.8)Co_(0.17)Al_(0.03)(OH)_(2)提升锂离子电池的循环稳定性

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有色金属科学与工程 2023年第1期14卷 57-66页

作者：赖福林王玉琴马全新周翎飞杨梦倩钟盛文 sydorov dmytro 江西理工大学材料冶金化学学部江西赣州341000 江西理工大学江西省动力电池及材料重点实验室江西赣州341000 江西理工大学宜春锂电新能源产业研究院江西宜春336000 乌克兰国家科学院生物有机化学与岩石化学研究所基辅01030

层状高镍正极材料(LiNi_(0.8)Co_(0.17)Al_(0.03)O_(2))因为具有高的镍含量,相比于LiCoO2拥有更高的比容量和更低的成本,受到了大众的欢迎。然而,循环过程中容量的快速衰退阻碍了LiNi_(0.8)Co_(0.17)Al_(0.03)O_(2)的进一步商业化使用... 详细信息

层状高镍正极材料(LiNi_(0.8)Co_(0.17)Al_(0.03)O_(2))因为具有高的镍含量,相比于LiCoO2拥有更高的比容量和更低的成本,受到了大众的欢迎。然而,循环过程中容量的快速衰退阻碍了LiNi_(0.8)Co_(0.17)Al_(0.03)O_(2)的进一步商业化使用。其中,Li+/Ni^(2+)混排现象是造成材料不良循环性能的主要原因之一。本文中,使用具有强氧化性的LiClO_(4)对Ni_(0.8)Co_(0.17)Al_(0.03)(OH)_(2)前驱体进行预氧化处理。X射线衍射(XRD)测试和精修结果显示,LiClO_(4)处理后的LiNi_(0.8)Co_(0.17)Al_(0.03)O_(2)(LiClO4-NCA)样品有着更低的Li+/Ni^(2+)混排程度,这与X射线光电子能谱(XPS)测试得到的正极材料中Ni^(2+)/Ni^(3+)结果相一致。电化学测试结果显示,LiClO_(4)-NCA相比于原始样品LiNi_(0.8)Co_(0.17)Al_(0.03)O_(2)(NCA)具有更优异的循环性能,1 C倍率循环100圈后,LiClO4-NCA的容量保持率(94.3%)明显高于NCA(82.4%)。LiClO_(4)-NCA优异的电化学性能归因于LiClO_(4)促进了材料中的Ni^(2+)转化为Ni^(3+),减少了阳离子混排现象,保持了更完整的层状结构。因此,LiClO_(4)对Ni_(0.8)Co_(0.17)Al_(0.03)(OH)_(2)前驱体进行预氧化处理可以改善材料中的Li+/Ni^(2+)混排现象,优化层状高镍正极材料的循环稳定性。

关键词：层状高镍正极材料预氧化改性 Li+/Ni2+混排循环稳定性

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