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Qiu L.,Beijing Institute of Technology | Qiu L.,Beijing Engineering Technology Research Center for Cellulose and Its Derivative Materials | Shao Z.,Beijing Institute of Technology | Shao Z.,Beijing Engineering Technology Research Center for Cellulose and Its Derivative Materials | And 5 more authors.
Carbohydrate Polymers | Year: 2014

New cellulose derivative CMC-Li was synthesized, and nanometer CMC-Li fiber was applied to lithium-ion battery and coated with AQ by electrospinning. Under the protection of inert gas, modified AQ/carbon nanofibers (CNF)/Li nanometer composite material was obtained by carbonization in 280 C as lithium battery anode materials for the first time. The morphologies and structures performance of materials were characterized by using IR, 1H NMR, SEM, CV and EIS, respectively. Specific capacity was increased from 197 to 226.4 mAh g -1 after modification for the first discharge at the rate of 2C. Irreversible reduction reaction peaks of modified material appeared between 1.5 and 1.7 V and the lowest oxidation reduction peak of the difference were 0.42 V, the polarization was weaker. Performance of cell with CMC-Li with the high degree of substitution (DS) was superior to that with low DS. Cellulose materials were applied to lithium battery to improve battery performance by electrospinning. © 2013 Elsevier Ltd. Source


Lan T.,Beijing Institute of Technology | Shao Z.-Q.,Beijing Institute of Technology | Wang W.-J.,Beijing Institute of Technology | Wang F.-J.,Beijing Institute of Technology | And 4 more authors.
Advanced Materials Research | Year: 2014

Nonwoven fibers of cellulose triacetate (CTA) were continuously electrospun by using DMSO/chloroform co-solvent system and the size and morphology of fibers were investigated. It was found that the concentration of 8wt% CTA fibers were obtained from DMSO/chloroform with volume ratio of 1:1, 3:2, 2:1, 3:1. The average diameters of CTA fiber was decreased with decreasing chloroform content in the mixed solvent. The minimum diameter of the continuous electrospun cellulose triacetate fibers obtained in this work ranged between 210 and 880 nm. © (2014) Trans Tech Publications, Switzerland. Source


Zhang Y.,Beijing Institute of Technology | Shao Z.,Beijing Institute of Technology | Gao K.,Beijing Institute of Technology | Li J.,Beijing Institute of Technology | And 4 more authors.
Cellulose | Year: 2014

By non-solvent-induced phase separation, nitrate glycerol ether cellulose (NGEC) gels were formed in ternary NGEC/acetone/ethanol system. The rheological behaviors of NGEC gels were investigated using dynamic rheological measurements. The final compositions and morphologies of NGEC gels were influenced by the initial solvent/non-solvent (acetone/ethanol) ratios and NGEC concentrations. In addition, the effect of initial acetone/ethanol ratios on the characteristics of NGEC gels is different from the effect of NGEC concentrations. The critical strain of NGEC gels decreased almost with increasing NGEC concentration of gels by increasing initial acetone ratio, but it increased with increasing NGEC concentration of gels by increasing NGEC concentration beyond a certain concentration in 2/3 (w/w) acetone/ethanol solution. For all gels, the storage modulus (G′) and loss modulus (G′′) of NGEC gels rapidly increased with increasing NGEC concentration of gels. In addition, the curves for G′ and G′′ were temperature sensitive throughout the entire temperature sweep, which implied that the interactions between NGEC/solvent could be disrupted upon heating to higher temperatures. © 2014, Springer Science+Business Media Dordrecht. Source


Lan T.,Beijing Institute of Technology | Shao Z.-Q.,Beijing Institute of Technology | Wang W.-J.,Beijing Institute of Technology | Wang F.-J.,Beijing Institute of Technology | And 4 more authors.
Journal of Applied Polymer Science | Year: 2014

Cellulose triacetate (CTA) nanofiber nonwoven mats were continuously electrospun by using mixed solvent of DMSO/chloroform system. The size and morphology of CTA nanofibers were investigated. It was found that CTA fibers with diameters in the range of 98 nm-1.81 μm were obtained from 8 wt % CTA solutions in 1: 1, 3: 2, 2: 1, 3: 1, 5: 1 and 7: 1 (v/v) DMSO/chloroform. The average diameter of CTA nanofiber was decreased and size distribution was narrowed with increasing the DMSO content in the mixed solvent. Smooth and uniform nanofibers with mean diameters of about 260 nm could be obtained from a solution of CTA in the binary system DMSO/chloroform 5: 1(v/v) at a polymer concentration of 8 wt %. © 2014 Wiley Periodicals, Inc. Source


Zhang Y.,Beijing Institute of Technology | Shao Z.,Beijing Institute of Technology | Shao Z.,North Century Cellulose Technology Research and Development Co. | Li J.,Beijing Institute of Technology | And 2 more authors.
Journal of Applied Polymer Science | Year: 2015

Nitrate glycerol ether cellulose (NGEC) alcogels are formed in the ternary NGEC/acetone/ethanol system. NGEC aerogels are prepared from NGEC alcogels after solvent exchange and drying under supercritical CO2 (scCO2). The aerogels are prepared with various densities and porosities, relating directly to the initial ethanol content. NGEC aerogels had surface areas of up to 183 m2 g-1 and large mesopore volumes with a combination of large macropore volumes and a wide range of mesopore sizes. The aerogels with larger pore size distribution range, average pore diameter, and mesopore and macropore volume were obtained from system with higher ethanol content. The aerogels were further characterized by X-ray diffraction, Brunauer-Emmett-Teller analysis, electron microscopy, and thermogravimetric analysis. The results showed that the NGEC aerogels clearly retained the crystalline structure from NGEC. Compared with NGEC powders, the thermal decomposition of NGEC aerogel is accelerated and this process becomes more acute. © 2014 Wiley Periodicals, Inc. Source

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