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Liu G.,Chifeng University | Qu J.,Changzhou University | Wang H.,China Aviation Lithium Battery Co.
Journal of Alloys and Compounds | Year: 2013

Ultra thin titanate nanosheets, octahedral TiO2 and spindle-like TiO2 were prepared via a facile hydrothermal route. The morphology and structure of the prepared samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The electrochemical lithium storage of these samples was studied by galvanostatic method and cyclic voltammetry. It is found that the spindle-like TiO2 with exposed {100} facets show enhanced lithium storage behavior at various current densities as-compared to titanate nanosheets and octahedral TiO2. The origin of good electrochemical performance may result from a lower barrier for surface transmission of Li+ ions through {100} facets. © 2013 Elsevier B.V. All rights reserved.

Hu X.,Sichuan Normal University | Hu X.,CAS Chengdu Institute of Organic Chemistry | Lin Z.,Food and Beverage | Yang K.,CAS Chengdu Institute of Organic Chemistry | And 2 more authors.
Electrochimica Acta | Year: 2011

Li 4Ti 5O 12/C composites were synthesized by one-step solid-state reaction method using four commonly used organic compounds or organic polymers as carbon source, i.e., polyacrylate acid (PAA), citric acid (CA), maleic acid (MA) and polyvinyl alcohol (PVA). The physical characteristics of Li 4Ti 5O 12/C composites were investigated by X-ray diffraction, electron microscopy, Raman spectroscopy, particle size distribution and thermogravimetry-derivative thermogravimetry techniques. Their electrochemical properties were characterized by cyclic voltammograms, electrochemical impedance spectra, constant current charge-discharge and rate charge-discharge. These analyses indicated that the carbon source and carbon content have a great effect on the physical and electrochemical performances of Li 4Ti 5O 12/C composites. An ideal carbon source and appropriate carbon content effectively improved the electrical contact between the Li 4Ti 5O 12 particles, which enhanced the discharge capacity and rate capability of Li 4Ti 5O 12/C composites. PAA was the best carbon source for the synthesis of Li 4Ti 5O 12/C composites. When the carbon content was 3.49 wt.% (LiOH·H 2O/PAA molar ratio of 1), as-prepared Li 4Ti 5O 12/C showed the maximum discharge capacity. At 0.2 C, initial capacity of the optimized sample was 168.6 mAh g -1 with capacity loss of 2.8% after 50 cycles. At 8 and 10 C, it showed discharge capacities of 143.5 and 132.7 mAh g -1, with capacity loss of 8.7 and 9.9% after 50 cycles, respectively. © 2011 Elsevier Ltd. All rights reserved.

Xiang D.-B.,Beijing Institute of Technology | Xiang D.-B.,China Aviation Lithium Battery Co. | Shao H.-B.,Beijing Institute of Technology
Chinese Chemical Letters | Year: 2014

The intramolecular electronic communication and multilevel ion-pairing effect of triferrocenylmethane (TriFcM) in organic phase was studied with the "thin-layer electrochemistry" approach. Three pairs of symmetric peaks in cyclic voltammetry of TriFcM correspond to three one-electron electrochemical reaction processes and indicate strong intramolecular electronic communication, which could be used to study the multilevel ion-pairing effect. Three different formation constants of ion-pairs between the three ferroceniums of TriFcM and perchlorate in thin organic film were obtained and compared. © 2014 Hui-Bo Shao.

Shao X.-Z.,Beijing Institute of Technology | Wang L.-S.,Beijing Institute of Technology | Yan G.-Q.,Beijing Institute of Technology | Yan G.-Q.,China Aviation Lithium Battery Co. | Yu G.-M.,Beijing Institute of Technology
Journal of Chemical and Engineering Data | Year: 2013

The solubility of tris(3-hydroxypropyl)phosphine oxide (THPPO) in selected solvents was measured by a static analytic method over the temperature range from (293 to 328) K in methanol, ethanol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, isobutyl alcohol, acetone, and a binary solvent mixture of ethanol + acetone. Several widely used thermodynamic models, such as the empirical equation and the Buchowski-Ksiazaczak (λh), Scatchard-Hildebrand, Wilson, nonrandom two-liquid (NRTL), and universal quasichemical (UNIQUAC) equations were applied to represent the measurement results. The binary interaction parameters of the above models were found to have a linear dependency on temperature, and the coefficients were regressed. The results show that all of these models can satisfactorily reproduce the experimental data and the NRTL equation can provide the best correlation with an overall relative standard deviation of 0.46 %. © 2013 American Chemical Society.

Wang M.,China Academy of Machinery Science and Technology | Chen Y.,China Academy of Machinery Science and Technology | Wu F.,Beijing Institute of Technology | Su Y.,Beijing Institute of Technology | And 2 more authors.
Electrochimica Acta | Year: 2010

LiNi0.33-xMn0.33Co0.33YxO 2 materials are synthesized by Y3+ substitute of Ni 2+ to improve the cycling performance and rate capability. The influence of the Y3+ doping on the structure and electrochemical properties are investigated by means of X-ray diffraction (XRD), scanning electron microscope (SEM), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), X-ray photoelectron spectroscopy (XPS) and galvanostatic charge/discharge tests. LiNi0.33Mn0.33Co 0.33O2 exhibits the capacity retentions of 89.9 and 87.8% at 2.0 and 4.0 C after 40 cycles, respectively. After doping, the capacity retentions of LiNi0.305Mn0.33Co0.33Y 0.025O2 are increased to 97.2 and 95.9% at 2.0 and 4.0 C, respectively. The discharge capacity of LiNi0.305Mn 0.33Co0.33Y0.025O2 at 5.0 C remains 75.7% of the discharge capacity at 0.2 C, while that of LiNi 0.33Mn0.33Co0.33O2 is only 47.5%. EIS measurement indicates that LiNi0.305Mn0.33Co 0.33Y0.025O2 electrode has the lower impedance value during cycling. It is considered that the higher capacity retention and superior rate capability of Y-doped samples can be ascribed to the reduced surface film resistance and charge transfer resistance of the electrode during cycling. © 2010 Elsevier Ltd All rights reserved.

Li H.,Jiangsu University | Li Y.,Jiangsu University | Chen L.,Jiangsu University | Jiang H.,Jiangsu University | And 3 more authors.
Journal of Alloys and Compounds | Year: 2014

A microwave assisted method is developed for synthesizing pure LiFe 1/3Mn1/3Co1/3PO4 and LiFe 1/3Mn1/3Co1/3PO4/C nanocomposite. Olivine LiFe1/3Mn1/3Co1/3PO4 coated with uniform amorphous carbon film of ∼5 nm in thickness with an average size of ∼200 nm is successfully obtained. Compared with pure LiFe 1/3Mn1/3Co1/3PO4, LiFe 1/3Mn1/3Co1/3PO4/C composite presents enhanced electrochemical Li-ion intercalation performances. It exhibits a high discharge capacity of 169 mA h g-1 at 0.1 C (theoretical capacity is 170 mA h g-1). The capacity retention is 99% after 30 cycles. Furthermore, the capacities are still retained 101 at 5 C and 76 mA h g-1 and 20 C, respectively. Carbon coating can significantly improve the Li-ion diffusion, the reversibility of lithium extraction/insertion and electrical conductivity of LiCo1/3Mn1/3Fe 1/3PO4. © 2014 Elsevier B.V. All rights reserved.

Wu W.-L.,Henan University of Science and Technology | Liang J.,Henan University of Science and Technology | Yan J.,China Aviation Lithium Battery Co. | Mao W.-F.,China Aviation Lithium Battery Co.
Journal of Solid State Electrochemistry | Year: 2013

Li3Ni x V2-x (PO4) 3/C (x = 0, 0.02, 0.04 and 0.06) samples have been synthesized via an improved sol-gel method. X-ray diffraction patterns indicate that the structure of the prepared samples retains monoclinic, and the single phase has not been changed with Ni doping. From the analysis of electrochemical performance, the Li3Ni0.04 V1.96(PO4)3/C sample exhibits the best electrochemical property. It delivers a discharge capacity of 112.1 mAh g-1 with capacity retention of 95.2 % over 300 cycles at 10 C rate in the range of 3.0-4.8 V; cyclic voltammetry and electrochemical impedance spectra testing further prove that the electrochemical reversibility and lithium ion diffusion behavior of Li3V 2(PO4)3 have also been effectively improved through Ni doping. © 2013 Springer-Verlag Berlin Heidelberg.

China Aviation Lithium Battery; Co | Date: 2013-08-29

Electric accumulators for vehicles; power battery, for vehicles; accumulator boxes; battery boxes; batteries for lighting; high tension batteries; chargers for electric batteries; electric batteries; galvanic cells; electric accumulators.

China Aviation Lithium Battery Co | Date: 2016-03-25

Accumulator boxes; Accumulator boxes; Accumulators, electric; Batteries, electric, for vehicles; Battery boxes; High tension batteries; Integrated circuits; Plates for batteries; Accumulator jars; Electric control panels.

China Aviation Lithium Battery Co | Date: 2017-01-17

Accumulator jars; Accumulator boxes; Accumulators, electric; Batteries, electric, for vehicles; Battery boxes; Battery chargers; Electric control panels; High tension batteries; Integrated circuits; Plates for batteries.

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