Elastomeric Electrolyte for High Capacity and Long‐Cycle‐Life Solid‐State Lithium Metal Battery
Elastomeric Electrolyte for High Capacity and Long‐Cycle‐Life Solid‐State Lithium Metal Battery
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DOI：
10.1002/smtd.202201328
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发表时间：
2023-02
期刊：
影响因子：
12.4
通讯作者：
Zekun Zhou;Zengren Tao;Ruiyong Chen;Zhen Liu;Zhen He;Lei Zhong;Xin Li;Guixiang Chen;Peng Z
中科院分区：
文献类型：
--
作者：
Zekun Zhou;Zengren Tao;Ruiyong Chen;Zhen Liu;Zhen He;Lei Zhong;Xin Li;Guixiang Chen;Peng Z
高的室温离子导电性和与锂金属及正极材料的良好兼容性是固态电解液应用于金属锂电池的先决条件。本文将传统的双辊研磨技术与界面润湿技术相结合，制备了固态聚合物电解质。由弹性体基质和高摩尔分数LiTFSI盐组成的电解液具有较高的室温离子电导率4.6×10−4 S cm−1，电化学氧化稳定性高达5.0 8V，界面稳定性得到改善。基于复杂的结构表征，包括同步辐射傅里叶变换红外显微镜、广角和小角X射线散射，形成了连续的离子传导路径，从而使这些现象合理化。此外，在室温下，Li||SSPE||LFP硬币电池表现出高容量(0.1C下161.5 mAhg−1)、长循环寿命(2000年循环后仍保持50%的容量和99.8%的库仑效率)以及高达5C的良好的C率兼容性。因此，本研究提供了一种很有前途的固态电解液，可以满足实用锂金属电池的电化学和机械要求。
High room‐temperature ionic conductivity and good compatibility with lithium metal and cathode materials are prerequisites for solid‐state electrolytes used in lithium metal batteries. Here, the solid‐state polymer electrolytes (SSPE) are prepared by combining the traditional two‐roll milling technology with interface wetting. The as‐prepared electrolytes consisting of elastomer matrix and high‐mole‐loading of LiTFSI salt show a high room temperature ionic conductivity of 4.6×10−4 S cm−1, a good electrochemical oxidation stability up to 5.08 V, and improved interface stability. These phenomena are rationalized with the formation of continuous ion conductive paths based on sophisticated structure characterization including synchrotron radiation Fourier‐transform infrared microscopy, wide‐ and small‐angle X‐ray scattering. Moreover, at room temperature, the Li||SSPE||LFP coin cell shows a high capacity (161.5 mAh g−1 at 0.1 C), long‐cycle‐life (retaining 50% capacity and 99.8% Coulombic efficiency after 2000 cycles), and good C‐rate compatibility up to 5 C. This study, therefore, provides a promising solid‐state electrolyte that meets both the electrochemical and mechanical requirements of practical lithium metal batteries.