Reporters learned from the Chinese Academy of Sciences on October 11 that Liu Jin-huai, an associate professor of the Institute of Intelligent Machinery at the Hefei Institute of Material Science, Chinese Academy of Sciences, and Liu Jinyun, an associate researcher at the Huangxingjiu Task Force, have made new achievements in the development of high-performance graphene lithium-ion batteries. Long-life three-dimensional graphene nanocomposite lithium-ion battery material. Research results published in the international journal "Advanced Materials", and was selected as the first papers.
From portable electronics to new energy electric vehicles, there is an urgent need for high-performance lithium-ion batteries. As the core of lithium-ion batteries, electrode active materials are generally required to have high capacity and energy density, long-term cycle stability and safety. In order to obtain high capacity and energy density, the proportion of active material in the electrode should be maximized. Cyclic stability and safety require the battery material to have excellent electron transport and ion diffusion properties. Three-dimensional nanostructures are ideal materials to meet these needs, however, the usual three-dimensional cell materials, including metal or other high-density materials, act as a framework support, greatly reducing the active material ratio, reducing the overall cell capacity, and also long term cycling stability The limiting factor.
Liu Jinyun and others through the University of Illinois at Urbana-Champaign and the Hefei Research Institute of Chinese Academy of Sciences, developed a composite material based on three-dimensional graphene battery with high active material loading, short ion-electron transport path, and the electrode material assembled into a battery Need to use any additives such as adhesives and conductive agents, the battery has high capacity and excellent cycle stability. Developed three-dimensional graphene / vanadium pentoxide battery cathode material, fully charge / discharge conditions in 12 minutes, after 2000 cycles the battery capacity is greater than 200 mAh / g (a large number of reports less than 1000 times, the capacity is generally lower than 150 mAh / g); and charge capacity for 1 minute to reach the similar capacity of more than 5 minutes reported in the commercial and literature. In addition, the structural design of the three-dimensional graphene composite battery material can also be applied to the negative electrode material of the lithium ion battery, for example, graphene / silicon composite negative electrode is developed, showing good versatility.
Market participants believe that breakthroughs in the development of graphene lithium-ion battery materials are expected to bring good benefits to the application and promotion of the graphene industry again.
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