期刊
ENERGY STORAGE MATERIALS
卷 39, 期 -, 页码 412-418出版社
ELSEVIER
DOI: 10.1016/j.ensm.2021.04.044
关键词
Hybrid coordination electrolyte; Aqueous aluminum ion batteries; Electrochromism; Polyaniline
资金
- Guangdong Basic and Applied Basic Research Foundation [2019A1515011819, 2020A1515110896, 2019A1515110980]
- National Natural Science Foundation of China [22005207]
This study presents a hybrid electrolyte based on Al(TOF)(3) and H3PO4 for aqueous aluminum ion batteries (AIBs) which exhibits superior stability and a record-breaking lifespan of 3850 cycles. The Al//PANI battery with this electrolyte shows high reversibility and stability during the charging/discharging process, and delivers a higher coloration efficiency of 84 cm(2) C-1 at a wavelength of 630 nm.
Aqueous aluminum ion batteries (AIBs) are attractive alternatives for post-lithium energy storage systems. However, the short lifespan seriously limits the development of AIBs, arising from the formation of a passivation layer on the Al electrode surface as well as the strong electrostatic interaction between bulky Al3+ ions and host materials. Herein, we developed a hybrid electrolyte based on aluminum trifluoromethanesulphonate (Al(TOF)(3)) and H3PO4 which can effectively alleviate the passivation and exhibit superior stability. A full aqueous AIB based on this electrolyte and polyaniline (PANI) cathode exhibits a record-breaking lifespan of 3850 cycles and superior rate capability. Mechanism study suggests that Al3+ ions are bonded to both the H2PO4 - and TOF- to form complex ions Al(H2PO4-)(x)(TOF-)(y)+(H2O)(n) , which can mitigate the strong charge densities of trivalent Al3+ and contribute to fast reaction kinetics. Besides, the ex-situ study reveals that PANI cathode experiences a co-intercalation/deintercalation process of Al(H2PO4-)(x)(TOF-)(y)+(H2O)(n), TOF-, and H+ during the charging/discharging process with high reversibility and stability. As a proof of concept, an electrochromic Al//PANI battery is fabricated, which combines both electrochromism and energy storage and delivers a higher coloration efficiency of 84 cm(2) C-1 at a wavelength of 630 nm. This work presents an effective and facile strategy to developing long-life aqueous Al//PANI batteries and may promote the application of AIBs with electrochromic function.
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