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Influence of carbon sources on the performance of carbon-coated nano-silicon

Chinese Physics B 2023年第10期32卷 689-694页

作者：王琳李娜陈浩森宋维力 Technology Beijing Institute of TechnologyBeijing 100081China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Tianjin Lishen Battery Joint-Stock Co. LtdTianjin 300384China

Silicon-based material is an important anode material for next-generation lithium-ion *** order to overcome its shortcomings,carbon coating is often employed to improve the electrochemical ***,the carbon source,carbon content,and different contact and mixing schemes between carbon sources and silicon are all complex factors and need to be *** this study,nano-silicon is coated by the chemical vapor deposition method using different carbon sources,such as acetylene,methane,propane,and *** content after coating is designed to stay at the same level to reduce the experimental *** show the sample with higher conductivity provides higher cycle *** is the best choice of the four carbon sources studied in this *** results indicate that the selection of the carbon source is an important factor that plays a significant role in electrochemical performance.

关键词： silicon carbon coated different carbon sources lithium-ion battery

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Engineering Cu_(2)O/Cu/N-C interface to induce directional migration of charge for driving photocatalytic homo-coupling of terminal alkynes

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Nano Research 2024年第8期17卷 6895-6902页

作者： Xiaoqin Yan Tianyi Xu Wenwen Zhan Yang Yang Yang Yu Jianjian Yi Xiaoxiao He Lei Yang Jianwei Zhao Liming Sun Xiguang Han Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials Department of ChemistrySchool of Chemistry&Materials ScienceJiangsu Normal UniversityXuzhou 221116China State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200241China College of Environmental Science and Engineering Yangzhou UniversityYangzhou 225009China Shenzhen HUASUAN Technology Co. LtdShenzhen 518055China

The efficient utilization of visible light catalysts for organic reactions necessitates not only the effective separation of photogenerated electrons and holes to participate in the reaction,but also their ability to form key intermediates with reactant *** present study successfully synthesized a crusiform-like mesoporous structure of nitrogen-doped carbon-coated Cu_(2)O/Cu(Cu_(2)O/Cu/N-C)with a Cu_(2)O/dual electron acceptor interface using etched HKUST-1 as the precursor.A series of theoretical and experimental studies have demonstrated that the Cu_(2)O/Cu/N-C interface in the photocatalytic homo-coupling of terminal alkynes not only effectively enhances the separation of photogenerated electron−hole pairs,but also facilitates the formation of the key intermediate[Cu_(2)O/Cu/N-C]-phenylacetylide and promotes the rearrangement of its internal *** a result,the homo-coupling reaction can be effectively *** primary reason for the functional role of Cu_(2)O/Cu/N-C interface lies in the downward bending of energy band from Cu_(2)O to N-doped C layers,induced by the different work functions of Cu_(2)O,Cu and N-doped C ***,Cu_(2)O/Cu/N-C photocatalysts demonstrate exceptional photocatalytic activity in the homo-coupling reaction of terminal alkynes under blue-light irradiation and air *** present study presents a novel research methodology for the development of highly efficient visible light catalysts to facilitate organic reactions in future applications.

关键词： photocatalysis homo-coupling of terminal alkynes directional migration of charges heterojunction interface Cu_(2)O carbon coated

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LiFePO_4 doped with magnesium prepared by hydrothermal reaction in glucose solution

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Chinese Chemical Letters 2008年第3期19卷 345-349页

作者： Xiu Qin Ou Guang Chuan Liang Jin Sheng Liang Sheng Zhao Xu Xia Zhao Institute of Power Source ＆ Ecomaterials Science Box 1055 Hebei University of Technology Tianjin 300130 China

Lithium iron phosphate （LiFePO4） doped with magnesium was hydrothermally synthesized from commercial LiOH, FeSO4, H3PO4 and MgSO4 with glucose as carbon precursor in aqueous solution. The samples were characterized by X-ray powder diffraction, scanning electron microscopy and constant charge-discharge cycling. The results show that the synthesized powders have been in situ coated with carbon precursor produced from caramel reaction of glucose. At ambient temperature （28±2℃）, the electrochemical performances of LiFePO4 prepared exhibit the high discharge capacity of 135 mAh g^-1 at 5C and good capacity retention of 98% over 90 cycles. The excellent electrochemical performances should be correlated with the intimate contact between carbon and LiFePO4 primary and secondary particles, resulting from the in situ formation of carbon precursor/carbon, leading to the increase in conductivity of LiFePO4.

关键词： Lithium iron phosphate Mg doping Hydrothermal reaction Glucose carbon coated

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催化化学气相沉积法制备LiFePO4/C复合材料的性能研究

催化化学气相沉积法制备LiFePO4/C复合材料的性能研究

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第30届全国化学与物理电源学术年会

作者：王建梅蔡飞鹏杨改王波胡素琴山东省科学院能源研究所

以CH为碳源,Fe为催化剂,采用催化化学气相沉积法(CCVD)在LiCO和纳米FePO原料上一步合成LiFePO/C复合材料。对比考察了碳热还原法、催化气相沉积法制备的LiFePO/C正极材料与金属锂组成的实验室电池的电化学性能,结果表明,后者具有较好的... 详细信息

以CH为碳源,Fe为催化剂,采用催化化学气相沉积法(CCVD)在LiCO和纳米FePO原料上一步合成LiFePO/C复合材料。对比考察了碳热还原法、催化气相沉积法制备的LiFePO/C正极材料与金属锂组成的实验室电池的电化学性能,结果表明,后者具有较好的电化学性能,特别是在高倍率条件下(5-10C)容量保持率高于前者。SEM测试发现,CH在反应过程中裂解成碳并组装成碳纳米纤维贯穿于LiFePO材料中,改善了磷酸铁锂电池的大电流充放电性能。

关键词： catalytic chemical vapor deposition(CCVD) LiFePO4 carbon coated fluidized bed

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