文献类型：期刊文献

英文题名：Emerging dual carbon fiber batteries

作者：Gan, Qi[1,2];Fu, Yu[1]

机构：[1]Tongji Univ, Sch Aerosp Engn & Appl Mech, Zhangwu Rd 100, Shanghai 200092, Peoples R China;[2]East China Univ Sci & Technol, Frontiers Sci Ctr Materiobiol & Dynam Chem, Key Lab Ultrafine Mat, Minist Educ, Shanghai 200237, Peoples R China

年份：2023

卷号：439

外文期刊名：ELECTROCHIMICA ACTA

收录：;EI(收录号：20230213350617);WOS:【SCI-EXPANDED(收录号:WOS:000905294900001)】；

基金：This work was financially supported by Tongji University (Project Nos. 13302150046 and 13302350056) , the National Natural Science Foundation of China (No. 32071337) . This work is also sponsored by the Young Elite Scientists Sponsorship Program of the Chinese Association of Science and Technology (2021QNRC001) and Shanghai Pujiang Program (20PJ1402600) . This study was also supported by 'the Fundamental Research Funds for the Central Universities'.

语种：英文

外文关键词：Dual ion batteries; Carbon fiber; Morphological evolution; Areal capacity

摘要：Dual graphite battery emerges as a promising renewable energy storage system with merits of a high working voltage, low cost and environment-friendliness. However, energy density is limited because of a low packing density of graphite. We propose for the first time dual carbon fiber batteries (DCFBs) in which carbon fiber functions as both cathode and anode. With a graphite mass loading of -30 mg cm-2 at pitch-based carbon fiber (PCF) cloth, the reversible discharge capacity of PCF-PCF type DCFBs (with PCF cloth cathodes/anodes) can reach 72 mAh g-1 at 0.1 C (1 C corresponding to 80 mAh g-1), resulting in an unprecedentedly high areal capacity of -2.2 mAh cm-2. Unlike the general applicability of commercialized carbon fiber as DCFBs anode, only PCF out of five kinds of commercialized carbon fibers can function as DCFBs cathode. Meanwhile, PCF-PCF type DCFB enables investigation into distinct electrochemical behaviors of Li+/PF6 - intercalation/deintercalation in PCF. Morphological difference of PCF brought about by Li+/PF6 - ions, as found out by ex-situ X-ray diffraction (XRD) and ex-situ scanning electronic microscopy/energy dispersive spectroscopy (SEM/EDS) characterizations, facilitates comprehensive understanding of electrochemical behavior of graphite. This work lays good foundations for future exploration into a new arena of dual ion batteries.