Graphene based new long-life aluminum ion battery

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Ningbo materials has made progress in the research of graphene based new long-life aluminum ion batteries.

electrochemical energy storage technology is the key to solve the problem of electric vehicles and renewable energy and power generation. Lithium ion batteries with organic solvents as electrolyte have advantages in energy density, but there are potential safety hazards and limited lithium resources. In contrast, water-based non lithium ion batteries (such as sodium ion, potassium ion, zinc ion, magnesium ion, etc.) 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 prospectively arranged the new concept battery research of non lithium ion batteries, A series of progress has been made on the basic research of water ion new concept 90mm battery (scientific reports 2013, 3, 1946; chemsuschem 2014, 7, 2295; advanced energy materials 2015, 5,; scientific reports 2015, 5, 18263; natural press the start key to turn on e communications 2016, 7, 11982)

however, water ions only ground the three addresses, and the cycle life of the battery is relatively limited, generally less than 1000 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 a new type of aluminum ion battery in nature (2015, 520, 324), which has attracted widespread attention in academia and industry because of its durability, low flammability and cost

inspired by this work, the power lithium battery Engineering Laboratory of Ningbo Institute of materials has carried out research on aluminum ion batteries with graphene as electrode. The recent research work was published in advanced energy materials (doi: 10.1002/aenm.) with the title of large-sized feed layer graphene enables an ultrafast and long-life aluminum ion battery power supply must have a good "grounding" device y

in this work, researchers used mass-produced multilayer graphene (produced and provided by Ningbo Moxi Technology Co., Ltd.) as flexible cathode, metal aluminum as cathode, and ionic liquid as electrolyte to build a 2 V aluminum ion battery with ultra-long cycle life and ultra-high magnification performance. It is found that the thickness (number of layers) and transverse size of two-dimensional flake graphite anode materials have an important influence on the intercalation behavior of alcl4- ions. Compared with the flake graphite with thousands of layers, the number of layers of multilayer graphene is very small (below 10 layers), which can significantly reduce the activation energy of alcl4 ion insertion and diffusion, making the battery have ultra-high magnification performance, so it can complete charge and discharge in 1 minute

on the other hand, the electrode made of multilayer graphene with larger size has better flexibility and graphitization degree, and has stronger resistance to the repeated insertion and removal of alcl4 ions, so that the battery has an ultra long cycle life, and the capacity almost does not decay after 10000 charge and discharge cycles. In addition, through a series of fine characterization, this research work further revealed the intercalation chemical mechanism of alcl4 ions in two-dimensional graphite cathode materials such as multilayer graphene and graphite, that is, the fourth-order and fifth-order structure change mechanism induced by intercalation ions. 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 fossil graphene based new long-life energy storage batteries

the above research work was supported by the key deployment project of the Chinese Academy of Sciences (kgzd-ew-t), the youth Promotion Association project of the Chinese Academy of Sciences (), the National Natural Science Foundation of China () and the natural science foundation of Zhejiang Province (ly15b030004)

Zhang Leyland, the first author of this research, is currently studying for a doctorate at the University of Texas at Austin

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