Asymmetric Polymer Electrolyte Constructed by Metal–Organic Framework for Solid‐State, Dendrite‐Free Lithium Metal Battery,Advanced Functional Materials

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Asymmetric Polymer Electrolyte Constructed by Metal–Organic Framework for Solid‐State, Dendrite‐Free Lithium Metal Battery
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-10-06 , DOI: 10.1002/adfm.202007198
Guoxu Wang ₁ , Pingge He ₁ , Li‐Zhen Fan ₁

Affiliation

Solid‐state polymer electrolytes (SPEs) with flexibility, easy processability, and low cost have been regarded as promising alternatives for conventional liquid electrolytes in next‐generation high‐safety lithium metal batteries. However, SPEs generally suffer poor strength to block Li dendrite growth during the charge/discharge process, which severely limits their wide practical applications. Here, a rational design of 3D cross‐linked network asymmetric SPE modified with a metal–organic framework (MOF) layer on one side is proposed and prepared through an in‐situ polymerization process. In such unique asymmetric SPEs, the nanoscale MOF layer acts as a shield that effectively suppresses the growth of Li dendrites and regulates the uniform Li⁺ transport, and the polymer electrolyte can be scattered in the whole cell to endow the smooth transmission of Li⁺. As a result, the asymmetric SPE exhibits high ionic conductivity, wide electrochemical window, high thermal stability and safety, which endows the Li/Li symmetrical cell with outstanding cyclic stability (operate well over 800 h at a current density of 0.1 mA cm⁻² for the capacity of 0.1 mAh cm⁻²).

中文翻译：

金属有机骨架构造的固态，无枝晶锂金属电池的不对称聚合物电解质

具有灵活性，易加工性和低成本的固态聚合物电解质（SPE）被认为是下一代高安全性锂金属电池中常规液体电解质的有前途的替代品。然而，在充电/放电过程中，SPE通常具有差的强度来阻止Li树枝状晶体的生长，这严重限制了其广泛的实际应用。在这里，提出了一种合理设计的3D交联网络不对称SPE，并在其一侧进行了金属-有机骨架（MOF）层的改性，并通过原位聚合工艺进行了制备。在这种独特的不对称SPE中，纳米MOF层充当屏蔽层，可有效抑制Li树枝状晶体的生长并调节均匀的Li ⁺聚合物电解质可以分散在整个电池中，从而使Li ⁺顺利传递。结果，不对称SPE表现出高离子电导率，宽阔的电化学窗口，高热稳定性和安全性，从而赋予Li / Li对称电池优异的循环稳定性（在0.1 mA cm ^-2的电流密度下可在800 h内良好运行）容量为0.1 mAh cm ^-2）。

更新日期：2020-10-06

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