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Zhang X.,Anhui University of Science and Technology | Xing Z.,Anhui University of Science and Technology | Wang L.,Anhui University of Science and Technology | Zhu Y.,Anhui University of Science and Technology | And 8 more authors.
Journal of Materials Chemistry | Year: 2012

MnO@C core-shell nanoplates with a size of ∼150 nm have been prepared via thermal treatment deposition of acetylene with the precursor of Mn(OH) 2 nanoplates, which has been hydrothermally synthesized. The thickness of the carbon shells varied from ∼3.1 to 13.7 nm by controlling the treatment temperature and reaction duration time. The electrochemical performance of the MnO@C nanoplates, which were synthesized at 550 °C for 10 h with a carbon shell thickness of ∼8.1 nm, display a high reversible capacity of ∼770 mA h g -1 at a current density of 200 mA g -1 and good cyclability after prolonged testing, which is higher than that of MnO@C nanoplates with a carbon shell thickness of ∼3.1, 4.0, 4.2, 10.9 and 13.7 nm. © 2012 The Royal Society of Chemistry. Source


Mei T.,Anhui University of Science and Technology | Li N.,Anhui University of Science and Technology | Li Q.,Anhui University of Science and Technology | Xing Z.,Anhui University of Science and Technology | And 5 more authors.
Materials Research Bulletin | Year: 2012

Hollow carbon octahedra with an average size of 300 nm and a shell thickness of 2.5 nm were prepared by a reaction starting from ferrocene and Mg(CH 3COO) 2·4H 2O at 700°C for 10 h. They became compressed and turned into deflated balloon-like octahedra when the reaction time was increased to 16 h. It was proposed that the gas pressure generated during the reaction process induced the transformation from broken carbon hollow octahedra into deflated balloon-like compressed octahedra. X-ray powder diffraction and Raman spectroscopy indicate that the as-obtained carbon products possess a graphitic structure and high-resolution transmission electron microscopy images indicate that they have low crystallinity. Their application as an electrode shows reversible capacity of 353 mAh g -1 after 100 cycles in the charge/discharge experiments of secondary lithium ion batteries. © 2012 Elsevier Ltd. All rights reserved. Source


Zhang X.,Anhui University of Science and Technology | Xing Z.,Anhui University of Science and Technology | Yu Y.,Anhui University of Science and Technology | Li Q.,Anhui University of Science and Technology | And 6 more authors.
CrystEngComm | Year: 2012

Mn 3O 4 nanowires with diameter of ∼15 nm and a length of up to several micrometres have been hydrothermally synthesized at 200 °C for 15 h without any surfactants. It was investigated that during the formation process of Mn 3O 4 nanowires the length of the nanowires increased while the diameter did not obviously change. The coercivity of the Mn 3O 4 nanowires is up to 5600 Oe at 5 K. As these Mn 3O 4 nanowires were treated with LiOH by solid state reaction at 750 °C for 6 h, interconnected LiMn 2O 4 polyhedrons were obtained. The achieved discharge capacity of the LiMn 2O 4 polyhedrons was 115 mAh g -1 and they retained 98.3% of this capacity after 60 cycles at 0.1 C. © 2012 The Royal Society of Chemistry. Source


Gong H.,Anhui University of Science and Technology | Yu Y.,Anhui University of Science and Technology | Li T.,Anhui University of Science and Technology | Mei T.,Anhui University of Science and Technology | And 5 more authors.
Materials Letters | Year: 2012

LiFePO4 nanopolyhedrons with the size of ~ 200 nm have been solvothermally synthesized in the binary solvent of benzyl alcohol and ethylene glycol. As citric acid added, microellipsoids with an average size of 1 μm were formed. LiFePO4 nanopolyhedrons and microellipsoids were coated by carbon layers using cellulose acetate as carbon source. Electrochemical measurements showed that the LiFePO4/C nanopolyhedrons could deliver a discharge capacity of 145 mAh g- 1 under 1 C and had a capacity decay rate of < 11% after 200 cycles, while the LiFePO4/C microellipsoids had a discharge capacity of 123 mAh g- 1 under 1 C and the capacity decay rate was less than 8% after 200 cycles. © 2011 Elsevier B.V. Source


Guo X.,Hefei University of Technology | Xiang H.F.,Hefei University of Technology | Zhou T.P.,Hefei University of Technology | Li W.H.,CAS Hefei Key Laboratory of Materials for Energy Conversion | And 3 more authors.
Electrochimica Acta | Year: 2013

Homogeneous Li4Ti5O12/graphene composite is prepared via an in-situ solid state reaction, after carbonpre-coating has been carried out. Its microstructure is compared with the materials prepared by a similarway, but without carbon coating. The results reveal that the carbon coating not only effectively confinesaggregation and agglomeration of the Li4Ti5O12 particles, but also enhances the combination between Li4Ti5O12 particles and graphene sheets. The Li4Ti5O12/graphene composite presents excellent rate capa-bility and lowerature performance. Even at 120 C, it still delivers a quite high capacity of about 136 mAh g -1. When the charge.discharge tests are performed at -10°C and -20°C, its specific capaci-ties are as high as 149 and 102 mAhg -1, respectively. In addition, the full-cells using LiNi 1/3Co1/3Mn1/3O2 as cathode material exhibit good rate capability. © 2013 Elsevier Ltd. All rights reserved. Source

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