氮掺杂聚丙烯腈基中空炭纤维用于锂硫电池正极  

Nitrogen doped hollow porous carbon fibers derived from polyacrylonitrile for Li-S batteries

作　　者：牛静宜 经德齐[1,4] 张兴华 苏维国[3] 张寿春[1,2,4] NIU Jing-yi;JING De-qi;ZHANG Xing-hua;SU Wei-guo;ZHANG Shou-chun(CAS Key Laboratory for Carbon Materials,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;National Key Laboratory of Science and Technology on Vessel Integrated Power System,Naval University of Engineering,Wuhan 430033,China;National Engineering Laboratory for Carbon Fiber Technology,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China)

机构地区：[1]中国科学院山西煤炭化学研究所炭材料重点实验室,山西太原030001 [2]中国科学院大学材料与光电研究中心,北京100049 [3]海军工程大学舰船综合动力系统国家重点实验室,湖北武汉430033 [4]中国科学院碳纤维制备技术国家工程实验室,山西太原030001

出　　处：《新型炭材料（中英文）》2023年第1期143-153,共11页New Carbon Materials

基　　金：山西省重点研发计划资助项目(202003D111002);国家自然科学基金(51903249);2022年度中国科学院山西煤炭化学研究所创新基金项目(SCJC-XCL-2022-12);山西省科技重大专项计划揭榜挂帅项目(202101040201003).

摘　　要：以聚丙烯腈(PAN)中空炭纤维为基体,通过KOH活化法制备了PAN中空多孔炭纤维用于锂硫电池正极材料基体。中空炭纤维经活化得到2491 m^(2)·g^(-1)的高比表面积和1.22 cm^(3)·g^(-1)的大孔隙体积。为了进一步提高电化学性能,使用水合肼对纤维前体进行了改性,以制备氮掺杂的中空多孔炭纤维。修饰后的纤维拥有1690 m^(2)·g^(-1)的比表面积,0.84 cm^(3)·g^(-1)的孔隙体积和8.81 at%的高氮含量。由于含氮基团可以增加纤维表面极性和吸附能力,所以在电流密度为1 C时,其起始比容量可以提升至到420 m Ah·g^(-1)。Hollow porous carbon fibers for Li-S battery electrodes were prepared by the KOH activation of carbon prepared from hollow polyacrylonitrile fibers.The fibers had a high specific surface area of 2491 m^(2)·g^(-1),a large pore volume of 1.22 cm^(3)·g^(-1)and an initial specific capacity of 330 m Ah·g^(-1)at a current density of 1 C.To improve their electrochemical performance,the fibers were modified by treatment with hydrazine hydrate to prepare nitrogen-doped hollow porous carbon fibers with a specific surface area of 1690 m^(2)·g^(-1),a pore volume of 0.84 cm^(3)·g^(-1)and a high nitrogen content of 8.81 at%.Because of the increased polarity and adsorption capacity produced by the nitrogen doping,the initial specific capacity of the fibers was increased to 420 m Ah·g^(-1)at a current density of 1 C.

关 键 词：中空炭纤维 活化 改性 锂硫电池 

分 类 号：TQ127.11[化学工程—无机化工]