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Huang Y.,Key Laboratory of Clean Energy Material and Technology of Ministry of Education | Huang Y.,Key Laboratory of Advanced Functional Materials of Autonomous Region | Huang Y.,Xinjiang University | Dong Z.,Key Laboratory of Clean Energy Material and Technology of Ministry of Education | And 7 more authors.
Electrochimica Acta | Year: 2011

Core-shell structure carbon coating Fe3O4 nanoparticles are prepared by a two-step method. The crystalline structure and the electrochemical performance of the prepared samples are investigated. The results indicate that a uniform and continuous carbon layer is formed on the surface of Fe3O4 nanoparticles. The core-shell structure Fe3O4/C nanoparticles show a high initial discharge capacity of 1546 mAh g-1 and a specific stable discharge capacity of about 800 mAh g-1 at 0.5 C with no noticeable capacity fading up to 100 cycles. © 2011 Elsevier Ltd. All rights reserved. Source


Duan L.,Key Laboratory of Clean Energy Materials and Technology | Duan L.,Key Laboratory of Advanced Functional Materials of Autonomous Region | Duan L.,Xinjiang University | Huang Y.,Key Laboratory of Clean Energy Materials and Technology | And 9 more authors.
Materials Letters | Year: 2012

Fe 3O 4 fuzzy spheroids were synthesized by a facile solvothermal method. The as-prepared Fe 3O 4 fuzzy spheroids were investigated by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy, and the results showed that they had a spinel structure and a uniform particle size in the range of 120-200 nm. Results of electrochemical testing showed that the Fe 3O 4 fuzzy spheroids exhibited a high initial charge capacity of 980.6 mAh g - 1 and 949.5 mAh g - 1 after 165 cycles at a current density of 0.5 C at ambient temperature, as well as good rate capability. The improvement of reversible capacity and cyclic performance for the Fe 3O 4 nanoparticles could be attributed to the special fuzzy spheroid structure. © 2011 Elsevier B.V. All rights reserved. Source


Huang Y.,Zhejiang University | Huang Y.,Key Laboratory of Advanced Functional Materials of Autonomous Region | Huang Y.,Xinjiang University | Jiang R.,Zhejiang University | And 6 more authors.
Materials Letters | Year: 2011

LiMn 2O 3.9Br 0.1 nanoparticles were prepared by a room-temperature solid-state coordination method. The structure and morphology of the as-prepared materials were analyzed by X-ray diffractometry and transmission electron microscopy. The results show that the LiMn 2O 3.9Br 0.1 is well-crystallized and consists of monodispersed nanoparticles 80-100 nm in size. Results of electrochemical testing show that the samples prepared at different temperatures have similar electrochemical performance. The initial discharge capacities of LiMn 2O 3.9Br 0.1 prepared at 800 °C and 700°C are 121 mAh g -1 and 118.9 mAh g -1, respectively, higher than for LiMn2O4 prepared using the same method. © 2011 Elsevier B.V. All rights reserved. Source

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