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材料工程  2019, Vol. 47 Issue (8): 22-27    DOI: 10.11868/j.issn.1001-4381.2017.001307
  新能源材料专栏 本期目录 | 过刊浏览 | 高级检索 |
氟化多壁碳纳米管作正极对锂/氟电池性能的影响
李旭, 孙晓刚, 蔡满园, 王杰, 陈玮, 陈珑, 邱治文
南昌大学 机电工程学院, 南昌 330031
Effect of fluorinated multi-walled carbon nanotubes as cathode on performance of Li/CFx batteries
LI Xu, SUN Xiao-gang, CAI Man-yuan, WANG Jie, CHEN Wei, CHEN Long, QIU Zhi-wen
College of Mechatronics Engineering, Nanchang University, Nanchang 330031, China
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摘要 通过对多壁碳纳米管(MWCNTs)进行氟化改性,获得氟碳原子比分别为0.28(CF0.28),0.56(CF0.56),0.78(CF0.78)的氟化多壁碳纳米管。将氟化多壁碳纳米管作正极活性物质涂覆于铝箔,金属锂片为对极,组装成锂/氟化多壁碳纳米管(Li/CFx)一次纽扣电池。采用热重分析(TGA)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射仪(XRD)、X射线光电子能谱分析(XPS)进行结构和性能表征,通过恒流放电检测电池的电化学性能。结果表明:活性物质为CF0.78的正极电极的电化学性能最佳,在电流密度为39mA/g时放电比容量达724mAh/g,同时出现了稳定的放电平台。在0.05C放电倍率时,3种电极的活性物质利用率分别达到73.4%,89.6%,92.9%。相比0.05C,2C放电倍率下的放电比容量衰减率分别为68.8%,34.1%,39.6%,表明提高氟化程度,能够降低放电比容量衰减率,虽CF0.78相对CF0.56的放电化容量衰减率有所上升,但在相同放电倍率时,其放电曲线稳定性是最好的。
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李旭
孙晓刚
蔡满园
王杰
陈玮
陈珑
邱治文
关键词 多壁碳纳米管氟化多壁碳纳米管锂/氟一次电池    
Abstract:Multiwalled carbon nanotubes(MWCNTs) were fluorinated to get the material of MWCNTs fluoride with different atomic ratio. The ratio of fluorine and carbon was 0.28(CF0.28), 0.56(CF0.56) and 0.78(CF0.78) respectively. The fluoride MWCNTs were used as cathode active material to coat on aluminum foil, lithium metal foil as counter electrode in Li/CFx batteries. The structures and properties were characterized by thermal gravimetric analyzer(TGA), scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray diffraction(XRD), and X-ray photoelectron spectroscopy(XPS). The electrochemical performance was tested by galvanostatic discharge test. The results show that the battery with CF0.78 has the best electrochemical performance. At the current density of 39mA/g, the battery displays high discharge specific capacity of 724mAh/g and appears with a more stable platform for the discharge process. At the current discharge rate of 0.05C, the utilization of three kinds of MWCNTs fluoride electrodes is 73.4%, 89.6%, 92.9%. When the discharge rate is 2C, batteries with three different MWCNTs fluoride have discharge specific capacity attenuation rate of 68.8%, 34.1%, and 39.6%. It indicates that the discharge specific capacity attenuation rate can be mitigated to a certain extent with the improved level of fluoridation. Although the discharge capacity attenuation rate of CF0.78 is higher than that of CF0.56, CF0.78 has the most stable discharge curve at the same discharge rate.
Key wordsmultiwall carbon nanotube    multiwall carbon nanotubes fluoride    lithium/fluoride primary battery
收稿日期: 2017-10-22      出版日期: 2019-08-22
中图分类号:  TM912.9  
通讯作者: 孙晓刚(1957-),男,教授,主要从事碳纳米管和锂离子电池方面的研究工作,联系地址:江西省南昌市红谷滩新区学府大道999号南昌大学前湖校区机电工程学院(330038),E-mail:xiaogangsun@163.com     E-mail: xiaogangsun@163.com
引用本文:   
李旭, 孙晓刚, 蔡满园, 王杰, 陈玮, 陈珑, 邱治文. 氟化多壁碳纳米管作正极对锂/氟电池性能的影响[J]. 材料工程, 2019, 47(8): 22-27.
LI Xu, SUN Xiao-gang, CAI Man-yuan, WANG Jie, CHEN Wei, CHEN Long, QIU Zhi-wen. Effect of fluorinated multi-walled carbon nanotubes as cathode on performance of Li/CFx batteries. Journal of Materials Engineering, 2019, 47(8): 22-27.
链接本文:  
http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2017.001307      或      http://jme.biam.ac.cn/CN/Y2019/V47/I8/22
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