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Full-Text Articles in Physical Sciences and Mathematics
Effect Of Vanadium Substitution On Structure Of Li2Fesio4/C Composites, Yang Hong, Zhang Ying, Cheng Xuan
Effect Of Vanadium Substitution On Structure Of Li2Fesio4/C Composites, Yang Hong, Zhang Ying, Cheng Xuan
Journal of Electrochemistry
The carbon coated lithium iron silicate (Li2FeSiO4/C) composites were prepared using less expansive iron starting material of soluble ferric nitrate through sol-gel process and solid state reaction. The theoretically calculated amounts of 5, 10, 15, 20, 25, 30, and 50% of vanadium (V) were introduced using NH4VO3 to obtain V-substituted Li2FeSiO4/C composites. It was found that the pure Li2FeSiO4/C composite exhibited a good crystallinity with P21/n and nearly no impurities being detected, while the V-substituted Li2FeSiO4/C composites showed major impurities of Li2SiO3 …
Preparation Of The Particle Size Controllable Lifepo4/C And Its Electrochemical Profile Characterization, Ming-E Wang, Jing-Yuan Liu, Meng-Yan Hou, Yong-Yao Xia
Preparation Of The Particle Size Controllable Lifepo4/C And Its Electrochemical Profile Characterization, Ming-E Wang, Jing-Yuan Liu, Meng-Yan Hou, Yong-Yao Xia
Journal of Electrochemistry
We adopted an effective route to prepare the particle size controllable core-shell structure carbon-coated LiFePO4 from different sized FePO4 precursors, varying from 80 nm, 200 nm and 1 μm by an in situ polymerization method integrated with a surface modification technology. The discharge capacities of the three sized LiFePO4/C are, respectively, 162 mAh·g-1, 142 mAh·g-1 and 92 mAh·g-1 at 0.1C rate. The nano-sized LiFePO4-a/C (80 nm) delivers a discharge capacity as large as 100 mAh·g-1 even at 30C, while the macroscopic LiFePO4-c/C (1 μm) exhibits a much poorer discharge …