Starch Gel Electrolyte and its Interaction with Trivalent Aluminum for Aqueous Aluminum-Ion Batteries: Enhanced Low Temperature Electrochemical Performance.

Autor: Ramakrishnan S; Electrochemical Energy Storage and Conversion Laboratory (EESCL), Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology (SRMIST), Kattankulathur, Tamil Nadu, 603203, India., Sasirajan Little Flower SR; Electrochemical Energy Storage and Conversion Laboratory (EESCL), Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology (SRMIST), Kattankulathur, Tamil Nadu, 603203, India., Hanamantrao DP; Electrochemical Energy Storage and Conversion Laboratory (EESCL), Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology (SRMIST), Kattankulathur, Tamil Nadu, 603203, India., Kasiviswanathan K; Electrochemical Energy Storage and Conversion Laboratory (EESCL), Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology (SRMIST), Kattankulathur, Tamil Nadu, 603203, India., Sesu DC; The Department of Chemical Sciences, Ariel University, Ariel, 4070000, Israel., Muthu K; Interdisciplinary Institute of Indian System of Medicine, SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu, 603203, India., Elumalai V; Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science, and Technology, Kattankulathur, Tamil Nadu, 603203, India., Vediappan K; Electrochemical Energy Storage and Conversion Laboratory (EESCL), Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology (SRMIST), Kattankulathur, Tamil Nadu, 603203, India.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2024 Sep; Vol. 20 (37), pp. e2402245. Date of Electronic Publication: 2024 May 15.
DOI: 10.1002/smll.202402245
Abstrakt: This study explores trivalent Al interaction with aqueous starch gel in the presence of two different anions through salting effect. Salting-out nature of Al 2 (SO 4 ) 3 ·18H 2 O with starch gel causes precipitation of starch; this happens due to competitive anion-water complex formation over starch-water interaction, thereby reducing polymer solubility. Salting-in effect of AlCl 3 with starch gel happens through Al 3+ cation interaction with hydroxyl group of starch and increases polymer solubility, making gel electrolyte viable for battery applications. Prepared gel electrolyte exhibits ionic conductivity of 1.59 mS cm -1 and a high t Al 3+ value of 0.77. The gel electrolyte's performance is studied using two different cathodes, the Al|MoO 3 cell employing starch gel electrolyte achieves discharge capacity of 193 mA h g -1 and Al|MnO 2 cell achieves discharge capacity of 140 mA h g -1 @0.1 A g -1 for first cycle. The diffusion coefficient of both cells using starch gel electrolyte is calculated and found to be 2.1 × 10 -11  cm 2 s -1 for Al|MoO 3 and 3.1 × 10 -11 cm 2 s -1 for Al|MnO 2 cells. The Al|MoO 3 cell at lower temperature shows improved electrochemical performance with a specific capacity retention of ≈87.8% over 90 cycles. This kind of aqueous gel electrolyte operating at low temperature broadens the application for next generation sustainable batteries.
(© 2024 Wiley‐VCH GmbH.)
Databáze: MEDLINE
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