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Full-Text Articles in Chemistry
Effects Of Sulfur-Containing Additive On Low Temperature Performance Of Graphite Anode, Ze-Li Wu, Ye-Zhen Zheng, Zhong-Ru Zhang, Yong Yang
Effects Of Sulfur-Containing Additive On Low Temperature Performance Of Graphite Anode, Ze-Li Wu, Ye-Zhen Zheng, Zhong-Ru Zhang, Yong Yang
Journal of Electrochemistry
The low temperature performance of lithium ion battery mainly depends on the graphite anode, and one of the research focuses is to improve the low temperature performance of the anode by additives. In this paper, the effects of different sulfur-containing functional groups such as DTD (ethylene sulfate), 1,3-PS (1,3-propane sultone) and ES (ethylene sulfite) on low temperature performances of artificial graphite materials were systematically studied. The results in density functional theory (DFT) calculations, cyclic voltammetry (CV), scanning electron microscopy (SEM) and charge-discharge measurement clearly demonstrated that all three sulfur-containing additives could participate in formation of films on the surface of …
Influences Of Fec-Based Electrolyte On Electrochemical Performance Of High Voltage Cathode Material Li2Copo4F, Zhi-Gang Wang, Wei-Min Zhao, Hong-Chun Wang, Min Lin, Zheng-Liang Gong, Yong Yang
Influences Of Fec-Based Electrolyte On Electrochemical Performance Of High Voltage Cathode Material Li2Copo4F, Zhi-Gang Wang, Wei-Min Zhao, Hong-Chun Wang, Min Lin, Zheng-Liang Gong, Yong Yang
Journal of Electrochemistry
The effects of fluoroethylene carbonate (FEC) as co-solvent on the electrochemical performance of high voltage cathode material Li2CoPO4F are investigated. Compared with traditional carbonate based electrolyte (1 mol·L-1 LiPF6 EC/DMC (1:1, m:m)), the FEC/DMC based electrolyte can significantly improved the electrochemical performance of Li2CoPO4F. After 100 cycles between 3V and 5.4 V at 1 C rate, the capacity retention of Li2CoPO4F electrode in 1 mol·L-1 LiPF6 EC/DMC (1:1, m:m) was 52.6 % , while that in the EC/DMC based electrolyte was only …
Preparations And Electrochemical Performances Of Carbon Coated Silicon/Graphite Composites, Tian-Yi Gao, Zheng-Liang Gong
Preparations And Electrochemical Performances Of Carbon Coated Silicon/Graphite Composites, Tian-Yi Gao, Zheng-Liang Gong
Journal of Electrochemistry
In this work, the carbon coated silicon (Si@C) composite materials were synthesized based on the industrial silicon powder (600 meshes) via a high energy ball milling combing with in-situ carbon coating (carbonization) method. The Si@C/graphite (Si/C) composite anode materials were prepared by a simple mechanical ball-milling approach. The effects of carbon coating and the ratio of Si to graphite on electrochemical performances of Si/graphite composite materials were investigated systematically. Compared with the nano-Si/graphite composites, the Si/C composites showed higher reversible capacity, better rate capability and cycle performance. The Si@C materials composited of amorphous carbon and crystal silicon with the primary …
Effects Of Carboxylic Acids On Structure And Performance Of 10% Vanadium Modified Li2Fesio4/C Composites, Xue-Xia Wei, Jia-Qi Huang, Shi-Yang Liu, Xuan Cheng, Ying Zhang
Effects Of Carboxylic Acids On Structure And Performance Of 10% Vanadium Modified Li2Fesio4/C Composites, Xue-Xia Wei, Jia-Qi Huang, Shi-Yang Liu, Xuan Cheng, Ying Zhang
Journal of Electrochemistry
The carbon coated 10% vanadium modified lithium iron silicate (Li2Fe0.9V0.1SiO4/C) composites were prepared by sol-gel method to form precursor and followed by solid state reaction. Effects of different carboxylic acids, namely, citric acid, acetic acid and oxalic acid, on the crystal structures, surface morphologies, interfacial characteristics and electrochemical properties of the composites were systematically investigated. It was found that a mixed P21 and Pmn21 phase was formed with the major impure phase of iron (Fe) and minor impurity of lithium silicate (Li2SiO3). The initial discharge capacities …