摘要
为开发高性能、低成本的锂硫电池正极储硫材料,利用天然生物质纤维兔毛为前驱体,经预处理和炭化制备了具有杂原子掺杂的兔毛中空碳纤维(RC),并采用热熔融法制得硫/兔毛基碳纤维(S/RC)复合材料。探讨了不同炭化温度对碳纤维形貌结构、S/RC复合材料晶型结构与电导率、锂硫电池的电化学性能及循环充放电稳定性的影响。结果表明:预处理温度为300℃,炭化温度为800℃时,制备的兔毛基中空碳纤维的形貌结构最好,用其作为正极材料制备的电池首次放电比容量达899 mA·h/g,在0.5C倍率下300次循环后放电比容量为598 mA·h/g,仍保持原始比容量的66.52%;在高倍率条件下该电池仍具有较高的放电比容量,1C和2C倍率下放电比容量分别为543.8和505.4 mA·h/g。
In order to develop a high-performance and low-cost lithium-sulfur battery cathode sulfur storage material,the rabbit hair hollow carbon fiber(RC)with heteroatom doping was successfully prepared by using natural biomass fiber as the precursor.After pretreatment and carbonization,the sulfur/rabbit hair carbon fiber(S/RC)composite material is prepared by hot melting method.The effects of different carbonization temperatures on the morphology and structure of carbon fibers,the crystalline structure and conductivity of S/RC composites,the electrochemical performance of lithium-sulfur batteries and the stability of cyclic charge and discharge were discussed.The results show that when the pretreatment temperature is 300℃and the carbonization temperature is 800℃,the morphology and structure of the prepared rabbit hair hollow carbon fiber are the most intact;the battery prepared with it has a first discharge specific capacity of 899 mA·h/g,and at 0.5C after 300 cycles,the discharge specific capacity became 598 mA·h/g,retaining 66.52%of the original specific capacity.Under high rate conditions,the battery still has a high discharge specific capacity,and the discharge specific capacities at 1C and 2C are 543.8 and 505.4 mA·h/g respectively.
作者
陈君妍
鞠敬鸽
邓南平
杨琪
程博闻
康卫民
CHEN Junyan;JU Jingge;DENG Nanping;YANG Qi;CHENG Bowen;KANG Weimin(School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China;State Key Laboratory of Separation Membrane and Membrane Process, Tiangong University, Tianjin 300387, China)
出处
《纺织学报》
EI
CAS
CSCD
北大核心
2021年第3期56-63,共8页
Journal of Textile Research
基金
国家自然科学基金项目(51873152)
天津市科技计划项目(19PTSYJC00010)。
关键词
兔毛
中空碳纤维
锂硫电池
正极材料
生物质纤维
rabbit hair
hollow carbon fiber
lithium-sulfur battery
anode material
biomass fiber
