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High stability gel electrolytes for long life lithium ion solid state supercapacitor

Authors :
Chen Zhi
Li Junxiang
Wu Mengqiang
Liao Jiaxuan
Source :
E3S Web of Conferences, Vol 257, p 01084 (2021)
Publication Year :
2021
Publisher :
EDP Sciences, 2021.

Abstract

Lithium ion capacitors with liquid electrolyte are prone to leakage, combustion, explosion and other dangerous accidents. To solve these problems, the solid gel separator prepared by polyvinylidene fluoride - six fluoropropene (PVDF-HFP) is used in this work to improve the safety and stability of lithium ion supercapacitors. The PVDF-HFP based gel separator was used to replace the commercial separator and electrolyte in the lithium ion capacitor. The solid-state lithium ion supercapacitor was matched with porous carbon (PC) and hard carbon (HC). The maximum energy density of the device is 148.76 wh/kg, even at the power density of 33.6 kW/kg, which still retains 20.6 wh/kg. In addition, 83.3% capacity of solid-state lithium-ion supercapacitor is retained after 8000 times of charge and discharge. The requirements of high power energy density, high cycle stability and high safety are realized.

Subjects

Subjects :
Environmental sciences
GE1-350

Details

Language :
English, French
ISSN :
22671242
Volume :
257
Database :
Directory of Open Access Journals
Journal :
E3S Web of Conferences
Publication Type :
Academic Journal
Accession number :
edsdoj.2c477d5bbeb443d2a10e03d4319e0fab
Document Type :
article
Full Text :
https://doi.org/10.1051/e3sconf/202125701084