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Highly Tough, Li-Metal Compatible Organic–Inorganic Double-Network Solvate Ionogel

机译：强硬，锂金属兼容有机无机双网络溶剂化物离子凝胶

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摘要

Ionogels are considered promising electrolytes for safe lithium-ion batteries (LIBs) because of their low flammability, good thermal stability, and wide electrochemical stability window. Conventional ionic liquid-based ionogels, however, face two main challenges; poor mechanical property and low Li-ion transfer number. In this work, a novel solvate ionogel electrolyte (SIGE) based on an organic-inorganic double network (DN) is designed and fabricated through nonhydrolytic sol-gel reaction and in situ polymerization processes. The unprecedented SIGE possesses high toughness (bearing the deformation under the pressure of 80 MPa without damage), high Li-ion transfer number of 0.43, and excellent Li-metal compatibility. As expected, the LiFePO4/Li cell using the newly developed SIGE delivers a high capacity retention of 95.2% over 500 cycles, and the average Coulombic efficiency is as high as 99.8%. Moreover, the Ni-rich LiNi0.8Co0.1Mn0.1O2 (NCM811)/Li cell based on the modified SIGE achieves a high Coulombic efficiency of 99.4%, which outperforms previous solid/quasi-solid-state NCM811-based LIBs. Interestingly, the SIGE-based pouch cells are workable under extreme conditions (e.g., severely deforming or clipping into segments). In terms of those unusual features, the as-obtained SIGE holds great promise for next-generation flexible and safe energy-storage devices.
机译：由于其低可燃性，良好的热稳定性和宽的电化学稳定性窗口，IOOGELS被认为是安全的锂离子电池（LIBS）的电解质。然而，常规的离子液体基离子凝胶面临两个主要挑战;机械性能差和低锂离子转移数。在这项工作中，基于有机无机双网络（DN）的新型溶剂化物离子电解质（SiGe）通过非水溶性溶胶 - 凝胶反应和原位聚合方法设计和制造。前所未有的SiGE具有高韧性（在没有损伤的情况下，在80MPa的压力下轴承的变形），高锂离子转移次数为0.43，优异的Li-Metal相容性。如预期的那样，使用新开发的SiGe的LiFePO4 / Li电池提供高容量保留95.2％超过500个循环，平均库仑效率高达99.8％。此外，基于改性SiGe的富含Ni的LINI0.8CO0.1MN0.1O2（NCM811）/ LI电池实现了99.4％的高库仑效率，这优于以前的固体/准固态NCM811的LIB。有趣的是，基于SiGe的袋细胞在极端条件下是可行的（例如，严重变形或剪切到区段中）。就这些不寻常的特征而言，AS获得的Sige对下一代灵活和安全的能量存储设备具有很大的承诺。

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  • 来源
    《Advanced energy materials》 |2019年第22期|1900257.1-1900257.11|共11页
  • 作者

    Yu Le; Guo Songtao; Lu Yue; Li Yaqian; Lan Xiwei; Wu Dabei; Li Ruguang; Wu Siqi; Hu Xianluo;

  • 作者单位

    Huazhong Univ Sci & Technol Sch Mat Sci & Engn State Key Lab Mat Proc & Die & Mould Technol Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci & Technol Sch Mat Sci & Engn State Key Lab Mat Proc & Die & Mould Technol Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci & Technol Sch Mat Sci & Engn State Key Lab Mat Proc & Die & Mould Technol Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci & Technol Sch Mat Sci & Engn State Key Lab Mat Proc & Die & Mould Technol Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci & Technol Sch Mat Sci & Engn State Key Lab Mat Proc & Die & Mould Technol Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci & Technol Sch Mat Sci & Engn State Key Lab Mat Proc & Die & Mould Technol Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci & Technol Sch Mat Sci & Engn State Key Lab Mat Proc & Die & Mould Technol Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci & Technol Sch Mat Sci & Engn State Key Lab Mat Proc & Die & Mould Technol Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci & Technol Sch Mat Sci & Engn State Key Lab Mat Proc & Die & Mould Technol Wuhan 430074 Hubei Peoples R China;

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  • 正文语种 eng
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  • 关键词

    electrolyte; high toughness; ionogel; lithium compatibility; lithium-ion batteries;

    机译：电解质;高韧性;离子凝胶;锂兼容性;锂离子电池;

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