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High-Performance Solid Polymer Electrolytes Filled with Vertically Aligned 2D Materials

机译：高性能固体聚合物电解质，填充了垂直排列的二维材料

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摘要

Solid state lithium metal batteries are the most promising next-generation power sources owing to their high energy density and safety. Solid polymer electrolytes (SPE) have gained wide attention due to the excellent flexibility, manufacturability, lightweight, and low-cost processing. However, fatal drawbacks of the SPE such as the insufficient ionic conductivity and Li+ transference number at room temperature restrict their practical application. Here vertically aligned 2D sheets are demonstrated as an advanced filler for SPE with enhanced ionic conductivity, Li+ transference number, mechanical modulus, and electrochemical stability, using vermiculite nanosheets as an example. The vertically aligned vermiculite sheets (VAVS), prepared by the temperature gradient freezing, provide aligned, continuous, run-through polymer-filler interfaces after infiltrating with polyethylene oxide (PEO)-based SPE. As a result, ionic conductivity as high as 1.89 x 10(-4) S cm(-1) at 25 degrees C is achieved with Li+ transference number close to 0.5. Along with their enhanced mechanical strength, Li vertical bar Li symmetric cells using VAVS-CSPE are stable over 1300 h with a low overpotential. LiFePO4 in all-solid-state lithium metal batteries with VAVS-CSPE could deliver a specific capacity of 167 mAh g(-1) at 0.1 C at 35 degrees C and 82% capacity retention after 200 cycles at 0.5 C.
机译：固态锂金属电池由于其高能量密度和安全性而成为最有前途的下一代电源。固态聚合物电解质（SPE）由于其出色的柔韧性，可制造性，轻便性和低成本加工而受到了广泛的关注。然而，SPE的致命缺点，例如离子电导率不足和室温下的Li +转移数不足，限制了它们的实际应用。在此，以ver石纳米片为例，证明了垂直排列的2D片材是SPE的高级填料，具有增强的离子电导率，Li +转移数，机械模量和电化学稳定性。通过温度梯度冷冻制备的垂直排列的ver石片（VAVS）在浸入基于聚环氧乙烷（PEO）的SPE后，提供了排列，连续，贯穿的聚合物-填料界面。结果，当Li +迁移数接近0.5时，在25摄氏度下可获得高达1.89 x 10（-4）S cm（-1）的离子电导率。除了具有增强的机械强度外，使用VAVS-CSPE的Li垂直条形Li对称电池在1300 h内稳定，且过电位低。具有VAVS-CSPE的全固态锂金属电池中的LiFePO4在35°C下于0.1C下可提供167 mAh g（-1）的比容量，在0.5C下200次循环后可提供82％的容量保持率。

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  • 来源
    《Advanced Functional Materials》 |2019年第16期|1900648.1-1900648.7|共7页
  • 作者

    Tang Wenjing; Tang Shan; Guan Xuze; Zhang Xinyue; Xiang Qian; Luo Jiayan;

  • 作者单位

    Tianjin Univ, Sch Chem Engn & Technol, State Key Lab Chem Engn, Minist Educ,Key Lab Green Chem Technol, Tianjin 300072, Peoples R China|Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300072, Peoples R China;

    Dalian Univ Technol, Dept Engn Mech, State Key Lab Struct Anal Ind Equipment, Dalian 116000, Peoples R China;

    Tianjin Univ, Sch Chem Engn & Technol, State Key Lab Chem Engn, Minist Educ,Key Lab Green Chem Technol, Tianjin 300072, Peoples R China|Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300072, Peoples R China;

    Tianjin Univ, Sch Chem Engn & Technol, State Key Lab Chem Engn, Minist Educ,Key Lab Green Chem Technol, Tianjin 300072, Peoples R China|Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300072, Peoples R China;

    Dalian Univ Technol, Dept Engn Mech, State Key Lab Struct Anal Ind Equipment, Dalian 116000, Peoples R China;

    Tianjin Univ, Sch Chem Engn & Technol, State Key Lab Chem Engn, Minist Educ,Key Lab Green Chem Technol, Tianjin 300072, Peoples R China|Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300072, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    2D materials; ionic conductivity; solid polymer electrolyte; solid state electrolyte; vertical alignment;

    机译：二维材料;离子电导率;固体聚合物电解质;固态电解质;垂直取向;

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