Abstract
The newly emerging demand for ‘beyond-lithium’ electrochemical energy storage systems necessitates the development of alternative options in providing sustainable cost-effective storage capabilities. In pursuit of discovering such a solution, the intercalation of bisulfate anions into graphite in 17 M H2SO4 solutions has been revaluated. Although the insertion process of bisulfate into graphite was extensively studied many years ago, only poor electrochemical performance has been demonstrated. In this work, we discovered the superior performance of the graphite bisulfate system, associated with the electrodes’ fabrication method which presents a high energy density of more than 80 mW h/g and a surprising rate capability (75 mW h/g was obtained at 15 C) alongside impressive long-term stability of more than 1500 cycles with only 5% capacity fading. Potentiostatic intermittent titration technique followed by slow-scan-rate cyclic voltammetry (SSCV) was used to shed light on the bisulfate intercalation process. Combining the bisulfate intercalation into the graphite with a highly reversible proton insertion process into Ti3C2 MXene in such a concentrated acidic environment allows the development of a dual-ion device composed of graphite positive electrode (cathode) and MXene negative electrode (anode). This asymmetric system shows a high energy density of 35 mW h/g, good cyclability and an extended potential window of 1.5 V, demonstrating new opportunities for further developments of intercalation electrodes for large energy storage.
Original language | English |
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Pages (from-to) | 1-10 |
Number of pages | 10 |
Journal | Energy Storage Materials |
Volume | 32 |
DOIs | |
State | Published - Nov 2020 |
Bibliographical note
Publisher Copyright:© 2020 Elsevier B.V.
Funding
The authors acknowledge funding from the Israel Ministry of Science Technology and Space (Grant 66032 ) for their financial support. Special thanks to Mr. Maxim Izoh for his valuable technical support. The authors acknowledge funding from the Israel Ministry of Science Technology and Space (Grant 66032) for their financial support. Special thanks to Mr. Maxim Izoh for his valuable technical support.
Funders | Funder number |
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Israel Ministry of Science Technology and Space | |
Ministry of science and technology, Israel | 66032 |
Keywords
- Aqueous batteries
- Dual-ion batteries
- Graphite cathode
- MXene