盐酸活化对石墨相氮化碳(g-C_3N_4)结构和g-C_3N_4/S锂硫电池正极复合材料性能的影响  

Effect of hydrochloric acid activation on properties of graphite carbonitride(g-C_3N_4)structure and g-C_3N_4/S cathode composites for lithium-sulfur batteries

作　　者：杨绍斌[1] 郭鑫瑶[1] 董伟[1] 张旭 YANG Shaobin;GUO Xinyao;DONG Wei;ZHANG Xu(College of Material Science and Engineering,Liaoning Technical University,Fuxin 123000,China)

机构地区：[1]辽宁工程技术大学材料科学与工程学院,阜新123000

出　　处：《复合材料学报》2019年第1期254-260,共7页Acta Materiae Compositae Sinica

摘　　要：以三聚氰胺为原料制备石墨相氮化碳(g-C_3N_4),加入盐酸进行水热处理得到酸活化的g-C_3N_4。研究了盐酸活化对g-C_3N_4结构、形貌及锂硫电池g-C_3N_4/S正极复合材料电化学性能的影响。实验结果表明:盐酸活化处理后,g-C_3N_4的层间距变化不显著。随着盐酸浓度增大,g-C_3N_4比表面积先增大后减小,当盐酸浓度为2.5wt%时,比表面积最大为86.1 m2·g-1,与未处理g-C_3N_4的13 m2·g-1相比提高了5～6倍;盐酸活化g-C_3N_4/S正极复合材料的比容量和循环性能也呈现先增大后减小的趋势,当盐酸浓度为2.5wt%时,比容量和循环性能最好,比容量为1 538mAh·g-1,循环50次后容量保持率为77.8%,电化学性能与比表面积呈强相关性。Graphite carbonitride(g-C3N4)was prepared from melamine and hydrothermally treated with hydrochlo-ric acid to obtain acid-activated g-C3N4.The effects of hydrochloric acid activation on the structure and morphology of g-C3N4 and the electrochemical performance of g-C3N4/S cathode composites were investigated experimentally.The experimental results show that g-C3N4 layer spacing does not change significantly after hydrochloric acid activa-tion.With the increase of hydrochloric acid concentration,the specific surface area of the g-C3N4 sample first increa-ses and then decreases.When the concentration of hydrochloric acid is 2.5wt%,the maximum specific surface area is 86.1 m^2·g^-1,which is 5-6 times higher than untreated g-C3N4 of 13 m^2·g^-1.The specific capacity and cycle performance of hydrochloric acid activated g-C3N4/S cathode composites also increase first and then decrease.When the concentration of hydrochloric acid is 2.5wt%,the specific capacity and cycle performance of the hydrochloric acid activated g-C3N4/S cathode composite sample are the best,and the specific capacity is 1 538 mAh·g^-1.After 50 cycles,its capacity holding rate is 77.8%.The electrochemical performance and specific surface area of hydro-chloric acid activated g-C3N4/S cathode composites show a strong correlation.

关 键 词：盐酸 g-C3N4 锂硫电池 正极复合材料 电性能 

分 类 号：TB333[一般工业技术—材料科学与工程]