Abstract
In this work, we investigated the influence of gum arabic (GA) as a structuring additive, on the electrochemical behavior of bio-derived carbon aerogels (CAGs). Modified carbonaceous materials were prepared by the gelatinization process of potato starch (PS) with the addition of GA in various quantities, followed by the thermal treatment of the obtained gels in an inert gas atmosphere. The obtained anode materials were examined by X-ray diffraction (XRD), elemental analysis (EA), galvanostatic charge/discharge tests (GCDT), extensive cycling (LT-GCDT) and cyclic voltammetry (CV) methods. The highest electrochemical performance was achieved for carbon aerogel material, in which 1% w/w GA was added. The results showed that the proper composition of carbon precursor with a structuring promoter improves the rheological properties of starch gel and stabilizes the final aerogel structure affecting CAG functional properties.
Highlights
Nowadays, the main share of the Li-ion market is dominated by cells based on carbon anodes
The modified carbon aerogels, based on potato starch (Sigma Aldrich, Saint Louis, MO, USA), were obtained via a gelatinization process described in detail in our previous work [14,15,16,17,18]
Potato starch with gum arabic were dispersed in distilled water and the suspensions were stirred and heated in an oil bath until the gelatinization temperature was reached
Summary
The main share of the Li-ion market is dominated by cells based on carbon anodes. They are obtained through eco-friendly, water-based synthesis Their facile preparation process including gelatinization, solvent exchange, low-temperature drying under ambient pressure and pyrolysis, requires relatively low energy expense (carbonization at maximum 700 ◦C), in comparison to the currently used carbonaceous anodes (thermal treatment at 2500 ◦C for synthetic graphite [4] and over 1000 ◦C for many types of hard carbons [19]). Another viable natural source for Li-ion batteries can be the gum-like substance, oozing from branches and stems of Acacia Senegal mature trees—gum arabic or gum Acacia (GA) [20]. An evaluation of the electrochemical performance of GA-structured carbon aerogels as a novel, eco-friendly Li-ion anodes is the main concern of presented study
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