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Enhanced cyclability of sulfur cathodes in lithium-sulfur batteries with na-alginate as a binder

Journal of Energy Chemistry 2013年第5期22卷 790-794页

作者： Weizhai Bao Zhian Zhang Yongqing Gan Xiwen Wang Jie Lia School of Metallurgy and Environment Central South University Engineering Research Center of High Performance Battery Materials and Devices Research Institute of Central South University in Shenzhen

na-alginate as a binder in an aqueous solvent has been applied in the preparation of sulfur cathodes for lithium-sulfur *** electrochemical performances have been investigated by a charge-discharge cycle test and electrochemical impedance spectroscopy (EIS).The EIS tests indicated that the alginate sulfur cathode had lower resistance and better kinetic characteristics than those of the poly (vinylidene fluoride) (PVDF) sulfur cathode using PVDF as a binder in a N-methy-2-pyrrolidone (NMP) *** charge-discharge tests showed that the discharge capacity and the capacity retention rate of na-alginate sulfur cathode were 508 mAh·g-1and 65.4% at the 50th cycle with a current density of 335 mA·*** with PVDF sulfur cathode,the alginate sulfur cathode showed a remarkably better cycle *** results show that the alginate binder has promising potential for lithium-sulfur battery applications.

关键词： lithium-sulfur battery binder na-alginate electrochemical performance

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Artificial Seed Production of Tylophora indica for Interim Storing and Swapping of Germplasm

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Horticultural Plant Journal 2017年第1期3卷 41-46页

作者： Saikat Gantait Joshitha Vijayan Adity Majee Department of Genetics and Plant Breeding Faculty of AgricultureBidhan Chandra Krishi Viswavidyalaya Department of Agricultural Biotechnology Faculty Centre for Integrated Rural Development and ManagementSchool of Agriculture and Rural DevelopmentRamakrishna Mission Vivekananda University

Our research work demonstrates the single bead alginate-encapsulation, interim storing and conversion of Tylophora indica(Burm. Fil.) *** effective encapsulation of in vitro nodal segments [(4 ± 1) mm long], ensuing in sphere-shaped artificial seeds of similar morphology, was achieved through 75 mmol·L^(-1)calcium chloride(CaCl_2 · 2H_2O) plus 3%(w/v) na-alginate with 93.3% conversion frequency. The earliest conversion(within 7 days of incubation) of artificial seeds occurred in half-strength liquid Murashige and Skoog medium. Among the three different temperature regimes [(5 ± 1) °C,(15 ± 1) °C, and(25 ± 1) °C], storage of artificial seeds at(15 ± 1) °C executed the highest frequency of conversion(90%) after 15 days of storage. Lengthier storage significantly reduced the conversion frequency of artificial seeds irrespective of storage temperature. Nevertheless, the conversion frequency after 30 days of storage at(15 ± 1) °C was recorded at 70% without further decline even following45 days of storage, which evidently suggests that lower temperature(15 ± 1) °C is apt for storage and subsequent conversion of T. indica artificial seeds. The present protocol could be expedient for short-term storing and swapping of T. indica germplasms between national and international laboratories.

关键词： Tylophora indica calcium chloride conversion encapsulation germplasm swap na-alginate nodal segment

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