New progress in the research of graphene-based new long-life aluminum ion batteries

　　The Power Lithium Battery Engineering Laboratory of Ningbo Institute of Materials has carried out research on aluminum-ion batteries using graphene as electrodes. Recent research work was published online in Advanced Energy Materials with the title of Large-sizedfew-layergrapheneenablesanultrafastandlong-lifealuminum-ionbattery

　　The Power Lithium Battery Engineering Laboratory of Ningbo Institute of Materials has carried out research on aluminum-ion batteries using graphene as electrodes. Recent research work was published online in "Advanced Energy Materials" 　　 Electrochemical Energy Storage Technology with the title of Large-sizedfew-layergrapheneenablesanultrafastandlong-lifealuminum-ionbattery It is the key to solving the grid-connected power generation of electric vehicles and renewable energy. Lithium-ion batteries using organic solvents as electrolytes have advantages in energy density, but they have potential safety hazards and limited lithium resources. In contrast, water-based non-lithium ion (such as sodium ion, potassium ion, zinc ion, magnesium ion, etc.) batteries have the advantages of high safety and low cost, and have important application prospects in the field of energy storage. Since 2013, the Power Lithium Battery Engineering Laboratory of Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences has forwarded the layout of new concept battery research for non-lithium-ion batteries, and has made a series of progress in the basic research of water-based ion new concept batteries (ScientificReports2013, 3 , 1946; ChemSusChem 2014, 7, 2295; Advanced Energy Materials 2015, 5, 1400930; Scientific Reports 2015, 5, 18263; Nature Communications 2016, 7, 11982). However, the cycle life of water-based ion batteries is relatively limited, generally less than 1,000 times, which is difficult to meet the needs of large-scale energy storage. In 2015, Professor Dai Hongjie of Stanford University in the United States reported in Nature (2015,520,324) a new type of aluminum-ion battery. Because of its durability, low flammability, and cost, it has attracted widespread attention from the academic and industrial circles. Inspired by this work, the Power Lithium Battery Engineering Laboratory of Ningbo Institute of Materials has carried out research on aluminum-ion batteries using graphene as electrodes. Recent research work was published online in Advanced Energy Materials with the title of Large-sizedfew-layergrapheneenablesanultrafastandlong-lifealuminum-ionbattery. (AdvancedEnergyMaterials, DOI: 10.1002/aenm.201700034). In this work, researchers used mass-produced multilayer graphene (produced and provided by Ningbo Moxi Technology Co., Ltd.) as the flexible positive electrode, metal aluminum as the negative electrode, and ionic liquid as the electrolyte to construct an ultra-long cycle life and ultra-long cycle life. High rate performance 2V aluminum ion battery. The study found that the thickness (number of layers) and lateral size of the two-dimensional flake graphite anode material have an important influence on the intercalation behavior of AlCl4-ion. Compared with a thousand layers of flake graphite, multilayer graphene has very few layers (less than 10 layers), which can significantly reduce the activation energy of AlCl4-ion intercalation and diffusion, making the battery have ultra-high rate performance, so It can be charged and discharged within 1 minute. On the other hand, electrodes made of larger-sized multilayer graphene have better flexibility and graphitization, and are more resistant to repeated intercalation and extraction of AlCl4-ions, thus allowing the battery to perform Long cycle life, almost no capacity degradation after 10,000 cycles of charge and discharge. In addition, this research work has further revealed the intercalation chemical mechanism of AlCl4- ions in two-dimensional graphite cathode materials such as multilayer graphene and graphite through a series of fine characterization, that is, the fourth and fifth order structures induced by intercalation ions. Change mechanism. This research work not only has important guiding significance for the selection of graphite cathode materials in aluminum ion batteries, but also has great academic value for the development of practical graphene-based new long-life energy storage batteries.　　 The above-mentioned research work was funded by the key deployment projects of the Academy, the Academy Youth Promotion Project, the National Natural Science Foundation of China and the Natural Science Foundation of Zhejiang Province.