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三维集流体实现无枝晶锂金属负极
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作者 王翱 《材料科学》 2024年第4期474-482,共9页
近年来,随着锂空气电池和锂硫电池的快速发展,具有高能量密度的锂金属电池再次受到动力电池研究人员的广泛关注。但是,在电池的循环过程中,锂金属负极存在锂枝晶、体积膨胀以及剧烈的副反应,这会导致电池充放电效率的降低并使得电池存... 近年来,随着锂空气电池和锂硫电池的快速发展,具有高能量密度的锂金属电池再次受到动力电池研究人员的广泛关注。但是,在电池的循环过程中,锂金属负极存在锂枝晶、体积膨胀以及剧烈的副反应,这会导致电池充放电效率的降低并使得电池存在安全隐患。为了获得稳定的锂金属负极,提出了各种改性策略,例如,电解质添加剂、隔膜改性、人工SEI膜和3D集流体等。其中,集流体的改性直接影响着负极表面结构,并且3D集流体所具有的大的比表面积可以有效地降低局部电流密度,诱导锂的均匀成核与沉积。本文综述了3D集流体改性中具有指导意义的部分研究,旨在为进一步的3D集流体的设计提供参考。 展开更多
关键词 沉积 亲锂性 枝晶 3D集流体
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Improvement of hydrophilicity of porous PVDF membranes with LiCl additives
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作者 裴丽霞 张立志 《Journal of Southeast University(English Edition)》 EI CAS 2010年第2期201-204,共4页
Porous polyvinylidene fluoride(PVDF)membranes blended with LiCl are prepared through the phase inversion method to obtain a good support layer for air dehumidification.The hydrophilicity of the resulting membrane is... Porous polyvinylidene fluoride(PVDF)membranes blended with LiCl are prepared through the phase inversion method to obtain a good support layer for air dehumidification.The hydrophilicity of the resulting membrane is evaluated by water contact angle measurements and vapor adsorption tests.The moisture permeation performance of the membrane is measured by permeation tests in terms of total mass transfer coefficients and moisture permeability rates.It is found that water contact angles and water vapor adsorption capacities increase with the increasing LiCl content in the casting solution.As the LiCl content increases,the total mass transfer coefficient increases slightly at a low LiCl content(below 2.5%)and then improves greatly at a high LiCl content(above 2.5%),whereas the moisture permeation rate increases.The results demonstrate that LiCl can remarkably improve the hydrophilicity of PVDF membranes,and then greatly enhance moisture permeation performance. 展开更多
关键词 porous polyvinylidene fluoride membranes LICL HYDROPHILICITY DEHUMIDIFICATION
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