Journal
RSC ADVANCES
Volume 9, Issue 67, Pages 38990-38997Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ra07234a
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Funding
- Fundamental Research Funds for the Central Universities [FRF-TP-18-003C2]
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Aluminum-ion batteries are currently regarded as the most promising energy storage batteries. The recent development of aluminum-ion batteries has been greatly promoted based on the use of graphitic carbon materials as a positive electrode. However, it remains unclear whether all carbonaceous materials can achieve excellent electrochemical behaviour similar to graphite. In this study, the correlation between the graphitization degree and capacity of a graphite electrode is systematically investigated for aluminum-ion batteries. The results show that the higher the graphitization degree, the larger the charge/discharge capacity and the better the cycling stability. Moreover, graphite nanoflakes with the highest graphitization degree deliver an initial discharge capacity of 66.5 mA h g(-1) at a current density of 100 mA g(-1), eventually retaining 66.3 mA h g(-1) after 100 cycles with a coulombic efficiency of 96.1% and capacity retention of 99.7%, exhibiting an ultra-stable cycling performance. More importantly, it can be concluded that the discharge capacity of different kinds of graphite materials can be predicted by determining the graphitization degree.
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