| Autor: |
Wu, Mingxia, Xie, Shengnan, Yang, Chongyang, Xue, Xin, Li, Heshun, Zhang, Can, Xu, Jiaqiang |
| Zdroj: |
Ionics; Feb2024, Vol. 30 Issue 2, p1061-1074, 14p |
| Abstrakt: |
Although hybrid supercapacitors (HSCs) with high-energy density can meet more work requirements, the safety failure caused by overdischarge abuse limits their further application. In order to improve the electrical performance and safety of HSCs, it is crucial to analyze the cause of HSCs failure. In this paper, we use hard carbon (HC) as the anode, lithium nickel-cobalt manganate oxide (NCM) and activated carbon (AC) as the composite cathode to prepare a high-energy density lithium-ion hybrid supercapacitor. The two failure modes of HSCs under extreme abuse conditions were investigated: cyclic overdischarge and external short circuit. It can be observed that under low voltage operating conditions (0 V and 0.5 V), copper (Cu) precipitates on the surfaces of anode and separator after only 250 cycles of overdischarge, while under high voltage conditions (1.0 V, 1.5 V, and 2.0 V), the electrode structure remains stable after 500 cycles of overdischarge. After 24-h external short circuit test, and then continued to charge and discharge test, it was found that the HSCs had flatulence, the energy of HSCs decay was below 80%, and the copper content in the anode was found to be 5.2wt%. The gas composition after external short circuit is mainly methane (CH4) and ethylene (C2H4). It is more dangerous to continue charging after overdischarge than simply overdischarge. It can be concluded that the performance failure of HSCs caused by external short circuit is more severe than cyclic over discharge. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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