Simultaneously achieving high energy and power density for ultrafast-charging supercapacitor built by a semi-graphitic hierarchical porous carbon nanosheet and a high-voltage alkaline aqueous electrolyte

doi:10.1016/j.jpowsour.2021.230103

CORC > 兰州理工大学 > 兰州理工大学 > 石油化工学院

	Simultaneously achieving high energy and power density for ultrafast-charging supercapacitor built by a semi-graphitic hierarchical porous carbon nanosheet and a high-voltage alkaline aqueous electrolyte
	Zhang, Deyi 1,2; Yang, Binbin 1,2; She, Wenna 2; Gao, Shiyao 2; Wang, Jingruo 2; Wang, Yi 1,2; Wang, Kunjie 1,2; Li, Hongxia 2; Han, Lele 2
刊名	JOURNAL OF POWER SOURCES
	2021-09-15
卷号	506
关键词	Supercapacitors Energy density Power density Ultrafast-charging Semi-graphitic interconnected hierarchical porous carbon
ISSN号	0378-7753
DOI	10.1016/j.jpowsour.2021.230103
英文摘要	How to simultaneously achieving high energy and power density is a key challenge for ultrafast-charging supercapacitors. Herein, a composite alkaline electrolyte with widened operation voltage is utilized to improve the energy density of aqueous supercapacitors, while a well-designed semi-graphitic hierarchical porous carbon nanosheet electrode material is prepared to ensure the high power density by effectively alleviating polarization during the charging/discharging process. The symmetrical supercapacitor built by the above electrode material and electrolyte exhibits both high energy and power density, which can reliably work at 1.3 V and display high capacitance retention of 85.0% at 50 A g(-1). A high energy density of 12.2 Wh kg(-1) is achieved at 203 W kg(-1) and more than 85.0% of energy density is retained even when the power density increases by ca 100-fold (10.2 Wh kg(-1) at 20.4 kW kg(-1)). The assembled supercapacitor can be charged to 100% within 3.4 s at 20 A g(-1) and then deliver a specific capacitance of 48.9 F g(-1) at a small discharging current density of 0.5 A g(-1), which value reaches 93.1% of the specific capacitance recorded by using the same charging/discharging current density (0.5 A g-(1)), indicating the reliable ultrafast-charging performance in practical application.
WOS研究方向	Chemistry ; Electrochemistry ; Energy & Fuels ; Materials Science
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000685080000002
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/148573]
专题	石油化工学院
作者单位	1.Lanzhou Univ Technol, Key Lab Low Carbon Energy & Chem Engn Gansu Prov, Lanzhou 730050, Peoples R China; 2.Lanzhou Univ Technol, Coll Petrochem Technol, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Deyi,Yang, Binbin,She, Wenna,et al. Simultaneously achieving high energy and power density for ultrafast-charging supercapacitor built by a semi-graphitic hierarchical porous carbon nanosheet and a high-voltage alkaline aqueous electrolyte[J]. JOURNAL OF POWER SOURCES,2021,506.
APA	Zhang, Deyi.,Yang, Binbin.,She, Wenna.,Gao, Shiyao.,Wang, Jingruo.,...&Han, Lele.(2021).Simultaneously achieving high energy and power density for ultrafast-charging supercapacitor built by a semi-graphitic hierarchical porous carbon nanosheet and a high-voltage alkaline aqueous electrolyte.JOURNAL OF POWER SOURCES,506.
MLA	Zhang, Deyi,et al."Simultaneously achieving high energy and power density for ultrafast-charging supercapacitor built by a semi-graphitic hierarchical porous carbon nanosheet and a high-voltage alkaline aqueous electrolyte".JOURNAL OF POWER SOURCES 506(2021).