细菌纤维素/科琴黑复合隔膜制备及对锂硫电池穿梭效应抑制的研究

Research on Preparation of Bacterial Cellulose/Ketjen Black Composite Membrane and Inhibition of Shuttle Effect in Li-S Batteries

关键词:  锂硫电池  穿梭效应  细菌纤维素  科琴黑

Key Words:lithium-sulfur battery  shuttle effect  bacterial cellulose  ketjen black

摘要:将科琴黑（KB）涂布到绿色、环保、可降解的细菌纤维素（BC）膜上，得到了细菌纤维素/科琴黑复合（BCK）隔膜。结果表明，BCK隔膜集合了BC膜较小的孔径、层状结构与KB大比表面积、导电性优异的特点，不仅具有优异的热稳定性和良好的电解液润湿性，而且很好地抑制了锂硫电池的穿梭效应。BCK基电池在0.1 C电流密度下的初始比容量为1362 mA·h/g，远高于聚丙烯（PP）基电池958 mA·h/g的初始比容量，并且在经历100个循环后，BCK基电池的放电比容量依然高于PP基电池。

Abstract:Ketjen black （KB） was coated on the green， environmental and biodegradable bacterial cellulose （BC） membrane to obtain the bacterial cellulose/ketjen black composite （BCK） membrane. The results showed that the BCK membrane combined the characteristics of small pore diameter and layered structure of BC membrane， large specific surface area and excellent conductivity of KB. It had not only excellent thermal stability and good electrolyte wettability， but also a good inhibition on the shuttle effect of lithium sulfur battery. The initial specific capacity of BCK based battery at current density of 0.1 C was 1362 mA·h/g， which was much higher than the initial specific capacity （958 mA·h/g） of polypropylene （PP） based battery. The discharge specific capacity of BCK based battery was still higher than that of PP based battery after 100 cycles.