摘要(英) |
Among current electrolyte-based rechargeable battery systems, the rechargeable aluminum battery (RAB) stands out for its predominating advantages, such as high-volumetric energy density, high-rate charge-discharge stability, eco-friendliness, earth abundance, and low-cost (based on cathode and anode material). Moreover, the electrolyte systems of the rechargeable aluminum battery have many advantages such as nonflammable, low toxicity and environmental impact. However, there still some problem need be overcome like low discharge voltage plateau, the highly corrosive electrolyte, serious self-discharge phenomenon and the puzzle for chloroaluminate anion–graphite intercalation reactions.
In this study, we focused on the self-discharge phenomenon. Systematical research on effect of cathode materials, purity of aluminum anode, charge/discharge rate and the type of ionic liquid cation will be carried out. With the aforementioned efforts, we will examine the self-discharge mechanism of aluminum batteries. Furthermore, we investigated the self-discharge phenomenon in doped graphite cathode materials (using N-doped, B-doped). Fortunately, doped graphite enhanced not only the capacitance but also the high-rate performance like our prediction. Unfortunately, the self-discharge problem became more serious due to the high energy state intercalation (Stage-3 GIC). With the In-situ XRD analysis in NSRRC, we traced the phase transformation in cathode materials from charge to self-discharge than discharge. The results were a powerful evidence for the mechanism in this study.
Finally, this study is the first research about the self-discharge mechanism for RAB and its impact factor. Perhaps the results will have contributed to the development of commercialization of aluminum batteries in the future. |
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