Dalian Institute of Materials made new progress in the study of flexible electrodes

Recently, Zhang Huamin, Li Pixian, researcher of the Department of Energy Storage Technology, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, and Zhang Hongzhang, associate researcher have made new progress in the research of high-load flexible self-supporting electrodes. Related work was published in Nano energy. 2017, 39, 418-428).

Because of their high specific surface area and short ion/electron transport path, nanometer-sized active material particles have received extensive attention in the field of electrochemical energy storage. However, with the increase of the load of the electrode, the nanoparticles easily fall off from the electrode, which limits its application in flexible energy storage devices. For the first time in 2016, the team reported on a “phase inversion” method to prepare “triple continuous” flexible electrodes with excellent adhesive strength and electron/ion mass transfer capacity (Adv. Funct. Mater., 2016, 26, 8427-8434). The above problems are solved well and successfully applied to flexible lithium-sulfur batteries and lithium-ion batteries, providing new ideas for the preparation of high load electrodes based on nanoparticles.

Based on the above research results, the team has further developed a flexible self-supporting electrode production technology. This technology overcomes the drawbacks of traditional methods such as suction filtration and template method that can only use one-dimensional and two-dimensional active materials to prepare electrodes. For the first time, zero-dimensional nanoparticles are applied to the preparation of flexible electrodes, and high load capacity and controllable appearance are prepared. High-performance self-supporting flexible electrodes suitable for large-scale production. The prepared flexible lithium-sulfur battery positive electrode has an active material content of 24 mg/cm<2> , the electrode first cycle surface capacity reaches 27.1 mAh/cm<2>, and the 100-cycle capacity retention rate is 64.1%. The prepared flexible lithium vanadium phosphate battery positive active material loading amounted to 17 mg/cm2, 100 cycles at a 1C rate, and the discharge specific capacity was stabilized at 120 mAh/g, and the capacity could be maintained at 94 mAh/g at a 5C rate. .

The study broadened the range of choice for high-load flexible electrode materials and created conditions for the subsequent development of high-performance flexible electrochemical energy storage devices.

The above research work was supported by the National Natural Science Foundation of China, the Ministry of Education's Energy and Material Chemistry Collaborative Innovation Center (iChEM), and the Youth Innovation Promotion Association of the Chinese Academy of Sciences.

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