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    Home > Coatings News > Paints and Coatings Market > Lithium battery "longevity" password found

    Lithium battery "longevity" password found

    • Last Update: 2020-12-12
    • Source: Internet
    • Author: User
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    Lithium batteries in the use of the process will produce sprigs, branch crystal fracture will not only lead to battery capacity attenuation, life discount, but also may pierce the diaphragm so that the battery short circuit fire caused safety problems. Professors Liang Jiajie and Chen Yongsheng of Nanjia University and Lai Chao of Jiangsu Normal University worked together to propose a new optimization strategy to solve this problem, successfully preparing a silver nanowire with multi-stage structure - graphene three-dimensional porous carrier, and load lithium metal as a composite negative material. This carrier can inhibit the production of lithium branch crystals, so that the battery can be ultra-high-speed charging, it is expected to significantly extend the "life" of lithium
    china
    . The findings were published in the latest issue of Advanced Materials.In recent years, many related researches around the world have made important breakthroughs in the design and synthesis of lithium negative materials, but it is still impossible to suppress the production of metal lithium in high current density charge and discharge and the expansion of electrode volume, so the long life of lithium batteries, large-capacity "fast charging and fast release" is still difficult to insurmount.。"The deposition of lithium metal into porous fluids with a three-dimensional network structure to construct a metal lithium composite negative material is one of the effective ways to solve these difficulties." Liang Jiajie said. Based on this understanding, the research group first proposed the ideal metal lithium negative 3D carrier material selection and optimization strategy to achieve ultra-high current density and ultra-long cycle life. They use graphene macro-body 3D network as a mechanical skeleton, silver nanowire 2D network as a conductive structure, through low-cost, compatible with industrial production coating-cold dry method, the preparation of multi-stage structure of silver nanowire - graphene three-dimensional porous carrier, and load lithium metal as a metal lithium composite negative material.tested, the metal lithium composite negative material ratio capacity of up to 2573mAh/g, symmetrical battery test, the first time in the very high current density of 40mAh/cm2 repeated charge and discharge for more than 1000 weeks, and the overcurrent is less than 120 millivolts. Through electro-mirror observation, it can be seen that the multi-stage three-dimensional structure carrier can successfully inhibit the growth of lithium branch crystals and the change of electrode volume in the metal lithium negative pole even under the cycle condition of high current charge and discharge.
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