Zhongke Laifang Power Science and Technology Co.

Chengdu, China

Zhongke Laifang Power Science and Technology Co.

Chengdu, China
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Ma X.,CAS Chengdu Institute of Organic Chemistry | Ma X.,University of Chinese Academy of Sciences | Ma X.,Zhongke Laifang Power Science and Technology Co. | Huang X.,CAS Chengdu Institute of Organic Chemistry | And 9 more authors.
Electrochimica Acta | Year: 2014

In this report, mechanically compliant gel polymer electrolyte (GPE) for flexible lithium-ion batteries is facilely fabricated. The GPE that based on the poly(methyl acrylate-co-acrylonitrile)/poly(vinyl alcohol) (P(MA-co-AN)/PVA) was prepared via emulsion polymerization. Herein, the P(MA-co-AN) copolymer is anticipated to exert beneficial for the bendability of the GPE, as well as swollen with the liquid electrolyte to provide a facile pathway for ion movement. The PVA serves as a stabilizer during the emulsion polymerization and a mechanical framework for the compliant polymer membrane. Performance benefits of the mechanically compliant membrane are elucidated in terms of mechanical behavior, thermostability and ionic conductivity. The GPE is still self-standing and mechanical flexible after swollen with liquid electrolyte. The GPE displays a conductivity of 0.98 mS cm-1 with the uptake electrolyte up to 150% of its own weight at 30 C, excellent electrochemical stability window (5.2 V vs. Li/Li+) and favorable interfacial characteristics. When used in flexible lithium-ion batteries, such a GPE demonstrates satisfactory compatibility with LiCoO2 and graphite electrodes. © 2013 Elsevier Ltd. All rights reserved.


Yang K.,CAS Chengdu Institute of Organic Chemistry | Yang K.,University of Chinese Academy of Sciences | Lin Z.,CAS Chengdu Institute of Organic Chemistry | Lin Z.,University of Chinese Academy of Sciences | And 6 more authors.
Electrochimica Acta | Year: 2011

A LiFePO4/C composite was successfully prepared by a polymer-pyrolysis-reduction method, using FePO4·2H 2O and lithium polyacrylate (PAALi) as raw materials. The structure of the LiFePO4/C composites was investigated by X-ray diffraction (XRD). The micromorphology of the precursor and LiFePO4/C powders was observed using scanning electron microscopy (SEM), and the in situ coating of carbon on the particles was observed by transmission electron microscopy (TEM). Furthermore, the electrochemical properties were evaluated by cyclic voltammograms (CVs), electrochemical impedance spectra (EIS) and constant current charge/discharge cycling tests. The results showed that the sample synthesized at 700 °C had the best electrochemical performance, exhibiting initial discharge capacities of 157, 139 and 109 mAh g-1 at rates of 0.1, 1 and 5 C, respectively. Moreover, the sample presented excellent capacity retention as there was no significant capacity fade after 50 cycles. © 2011 Elsevier Ltd. All rights reserved.


Hu X.,Sichuan Normal University | Hu X.,Zhongke Laifang Power Science and Technology Co. | Lin Z.,CAS Chengdu Institute of Organic Chemistry | Lin Z.,University of Chinese Academy of Sciences | And 7 more authors.
Journal of Alloys and Compounds | Year: 2010

Spinel Li4Ti5O12/C was synthesized by one-step solid-state reaction route using lithium polyacrylate (PAALi) as lithium and carbon sources, and TiO2 as titanium source. The characteristics of Li4Ti5O12/C composites were determined by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and thermogravimetric-differential thermal analysis methods. Their electrochemical performances were investigated by cyclic voltammograms, constant current charge-discharge and rate charge-discharge. It was found that molecular weight of polyacrylic acid (PAA), heating rate and sintering duration directly affected the physical and electrochemical performances of Li 4Ti5O12/C composites. The Li4Ti 5O12/C composites with the optimized electrochemical performances were obtained in the following conditions, i.e., PAA with the molecular weight of 10,000, heating rate of 20 °C min-1 and sintering duration of 8 h. At charge-discharge rate of 4 C and 8 C, the optimized sample showed discharge capacities of 148.4 and 142.4 mAh g -1, with capacity retention of 94.48 and 90.53% after 50 cycles, respectively. Even at 20 C, its discharge capacity was 116.0 mAh g-1 with capacity retention of 87.61% after 50 cycles. © 2010 Elsevier B.V. All rights reserved.


Yang K.,CAS Chengdu Institute of Organic Chemistry | Yang K.,University of Chinese Academy of Sciences | Deng Z.,CAS Chengdu Institute of Organic Chemistry | Deng Z.,University of Chinese Academy of Sciences | And 3 more authors.
Journal of Power Sources | Year: 2012

Olivine LiFePO 4 and LiFePO 4/C are successfully prepared by a simple solid-state reaction using FePO 4·2H 2O, lithium oxalate and glucose (bare LiFePO 4 without adding glucose) as raw materials. The structure of the LiFePO 4 and LiFePO 4/C is investigated by X-ray diffraction (XRD). The micromorphology of LiFePO 4 and LiFePO 4/C is observed using scanning electron microscopy (SEM) and BET, and the in situ coating of carbon on the particles is observed by transmission electron microscopy (TEM) and Raman spectrum. Furthermore, the electrochemical properties are evaluated by cyclic voltammograms (CVs), electrochemical impedance spectra (EIS) and constant current charge/discharge cycling tests. The results show that carbon coated LiFePO 4 can deliver better battery performance than the bare LiFePO 4. It exhibits initial discharge capacities of 162, 142 and 112 mA h g -1 at rates of 0.1, 1 and 10 C, respectively, and it presents excellent capacity retention as there is tiny capacity fade after 100 cycles. Moreover, the reductive mechanism of using lithium carboxylic acid to synthesize LiFePO 4 is firstly mentioned. © 2011 Elsevier B.V.


Shi Z.,CAS Chengdu Institute of Organic Chemistry | Shi Z.,University of Chinese Academy of Sciences | Huang M.,CAS Chengdu Institute of Organic Chemistry | Huang M.,University of Chinese Academy of Sciences | And 11 more authors.
Journal of Solid State Electrochemistry | Year: 2012

LiFePO 4/C cathode materials were synthesized through in situ solid-state reaction route using Fe 2O 3, NH 4H 2PO 4, Li 2C 2O 4, and lithium polyacrylate as raw materials. The precursor of LiFePO 4/C was investigated by thermogravimetric/differential thermal analysis. The effects of synthesis temperature and molar ratio of organic lithium salts on the performance of samples were characterized by X-ray diffraction, scanning electron microscopy, electrochemical impedance spectra, cyclic voltammogram, and constant current charge/discharge test. The sample prepared at optimized conditions of synthesis temperature at 700°C and molar ratio with 1.17:1 exhibits excellent rate performance and cycling stability at room temperature. © 2011 Springer-Verlag.


Huang X.,CAS Chengdu Institute of Organic Chemistry | Huang X.,University of Chinese Academy of Sciences | Ma X.,CAS Chengdu Institute of Organic Chemistry | Ma X.,Zhongke Laifang Power Science and Technology Co. | And 9 more authors.
Solid State Ionics | Year: 2012

Novel solid polymer electrolytes (named as SR x (x = 1-6)) containing trifluoromethane sulfonates (LiCF 3SO 3) are prepared based on the blend of poly (acrylonitrile-co-vinyl ethylene carbonate) poly (AN-co-VEC) and ethylene vinyl acetate copolymer (EVA). The structural properties of the polymer electrolytes SR x are systematically investigated by varieties of techniques, and the electrochemical performance including ion conductivity and Li + transference number are studied by electrochemical impedance spectroscopy (EIS). The surface morphology of solid polymer electrolyte are subjected to transmission electron microscopy (TEM) and scanning electron microscopy (SEM) measurements, by which highly collected spherical grains are found on the picture of SEM and TEM. It is noteworthy that the special structure probably affords fast transport paths for Li +, enhancing ionic conductivity (= 6.0 × 10 - 5 S cm - 1) and Li + transference number (t + = 0.74), and the former is higher than that of conventional solid polymer electrolytes which is up to now mostly 10 - 7 to 10 - 8. The reason may be due to excellent solubility of VEC for Li + salt, besides, the spherical structure of the solid polymer electrolyte may play an important role. This is perhaps the first report of VEC used as host copolymer for the solid polymer electrolytes.


Ma X.,CAS Chengdu Institute of Organic Chemistry | Ma X.,University of Chinese Academy of Sciences | Huang X.,CAS Chengdu Institute of Organic Chemistry | Huang X.,University of Chinese Academy of Sciences | And 12 more authors.
Journal of Power Sources | Year: 2014

In the present paper, an anionic polymer electrolyte (APE) is facilely prepared using the surface-charged latex nanoparticles as the building blocks for the flexible lithium-ion batteries. Driven by the self-assembly of surface-charged latex, the APE demonstrates nanoporous structure, which provides continuous pathway for lithium conduction. The anionic polymer membrane exhibits mechanical flexibility before and after swollen with liquid electrolyte. Performance benefits of the anionic polymer membrane, as compared to commercialized polyethylene (PE) separator, are elucidated in terms of thermal shrinkage, liquid electrolyte wettability, mechanical bendability and open circuit voltage (OCV). Based on comprehensive characterization of the anionic polymer membrane/electrolyte characteristics, feasibility of applying the APE to electrolytes for flexible lithium-ion batteries is explored. The well-developed ion-conductive channel of the APE, in conjunction with stability of the surface-charged nanoparticles during cycling, plays a crucial role in providing excellent in cell performance. © 2014 Elsevier B.V. All rights reserved.


Lin Z.,CAS Chengdu Institute of Organic Chemistry | Lin Z.,University of Chinese Academy of Sciences | Hu X.,Sichuan Normal University | Huai Y.,CAS Chengdu Institute of Organic Chemistry | And 9 more authors.
Solid State Ionics | Year: 2010

Li4Ti5O12/C anode material was simply obtained via a modified one-step solid-state reaction route using the original materials of lithium polyacrylate (PAALi) as lithium and carbon sources, and TiO2 as titanium source. The physical characteristics of the Li4Ti5O12/C composite were investigated by X-ray diffraction, scanning electron microscopy and transmission electron microscopy techniques. The particle size of Li4Ti5O12 in the composite was about 200 nm. The electrochemical properties were evaluated by electrochemical impedance spectra and constant current charge/discharge cycling. It was demonstrated that the as-prepared Li4Ti5O12/C composite presented excellent high-rate characteristics and cycleabilities. The initial specific capacity of the composite was 130.0 mA h g- 1 at 8.60 mA cm- 2, and excellent cycle performance was still maintained with the current density increase. Moreover, it was proved that the electric conductivity and cycle performance of Li4Ti5O12 were effectively enhanced due to the uniformly dispersed pyrolytic carbon in the Li4Ti5O12 particles. © 2010 Elsevier B.V. All rights reserved.


Hu X.,Sichuan Normal University | Hu X.,Zhongke Laifang Power Science and Technology Co. | Lin Z.,Food and Beverage | Yang K.,CAS Chengdu Institute of Organic Chemistry | And 2 more authors.
Journal of Physical Chemistry A | Year: 2011

The kinetics of one-step solid-state reaction of Li 4Ti 5O 12/C in a dynamic nitrogen atmosphere was first studied by means of thermogravimetric-differential thermal analysis technique at five different heating rates. According to the double equal-double steps method, the Li 4Ti 5O 12/C solid-state reaction mechanism could be properly described as the Jander equation, which was a three-dimensional diffusion with spherical symmetry, and the reaction mechanism functions were listed as follows: f(α) ≥ 3/ 2(1 - α) 2/3[1 - (1 - α) 1/3] -1, G(α) ≥ [1 - (1 - α) 1/3] 2. In FWO method, average activation energy, frequency factor, and reaction order were 284.40 kJ mol -1, 2.51×10 18 min -1, and 1.01, respectively. However, the corresponding values in FRL method were 271.70 kJ mol -1, 1.00×10 17 min -1, and 0.96, respectively. Moreover, the values of enthalpy of activation, Gibbs free energy of activation, and entropy of activation at the peak temperature were 272.06 kJ mol -1, 240.16 kJ mol -1, and 44.24 J mol -1 K -1, respectively. © 2011 American Chemical Society.

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