Journal
NANO ENERGY
Volume 90, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2021.106500
Keywords
Biomass activated carbon; Zinc perchlorate; Wide temperature range; High energy density; Zinc-ion hybrid supercapacitors
Categories
Funding
- Shenzhen Science and Technology Innovation Committee [JCYJ20190806145609284, GJHZ20190820091203667]
- Guangdong Basic and Applied Basic Research Foundation [2020A1515010716]
- Guangdong Introducing Innovative and Entrepreneurial Teams Program [2019ZT08Z656]
- Shenzhen Science and Technology Program [KQTD20190929172522248]
- GROUPSTARS CHEMICAL (YUNNAN) CHINA L.L.C.
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Zinc-ion hybrid supercapacitor (ZHSC) combines the high power density of supercapacitors with the high energy density of batteries, utilizing the environmental and cost benefits of zinc-ion technology. Developing an electrolyte with thermal stability and anti-freezing property is crucial for achieving high energy density ZHSC working in a wide temperature range.
Zinc-ion hybrid supercapacitor (ZHSC), emerging as a promising energy storage device, bring together the benefits of the high power density of supercapacitors, the high energy density of batteries and the environmental and cost benefits of zinc-ion technology. However, the development of high energy density ZHSC working in a wide temperature range is still a challenge. The key to achieve this target is to develop the electrolyte with thermal stability and anti-freezing property which is compatible with the advanced cathode material. Herein, a natural biomass coconut shell derived activated carbon as cathode and cost-effective aqueous Zn(ClO4)2 as electrolyte are applied in aqueous ZHSC. The fabricated aqueous ZHSC exhibits an outstanding high energy density of 190.3 W h/kg at 89.8 W/kg. Furthermore, a robust flexible quasi-solid-state ZHSC device was constructed by using a cross-linked poly(vinyl alcohol)/montmorillonite/Zn(ClO4)2 gel electrolyte (PVA/MMT/Zn (ClO4)2), which shows superior electrochemical performance over a wide working temperature range. Experimental analysis and molecular dynamics simulations reveal that the Zn(ClO4)2 process faster ionic migration compared to other Zn-based salts and form more hydrogen bonds with H2O, leading to a superior anti-freezing property. Our flexible device maintains the high energy storage capacities and excellent cycling stability over a wide temperature range from - 50 to 80 degrees C, suggesting its great potential applications for energy storage applications in harsh environmental conditions.
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