Morphosynthesis of 3D Macroporous Garnet Frameworks and Perfusion of Polymer‐Stabilized Lithium Salts for Flexible Solid‐State Hybrid Electrolytes
Morphosynthesis of 3D Macroporous Garnet Frameworks and Perfusion of Polymer‐Stabilized Lithium Salts for Flexible Solid‐State Hybrid Electrolytes
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DOI：
10.1002/admi.201900200
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发表时间：
2019-04
影响因子：
5.4
通讯作者：
Ruguang Li;Songtao Guo;Le Yu;Libin Wang;Dabei Wu;Yaqian Li;Xianluo Hu
中科院分区：
文献类型：
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作者：
Ruguang Li;Songtao Guo;Le Yu;Libin Wang;Dabei Wu;Yaqian Li;Xianluo Hu
固态锂离子传导膜正在成为可充电锂电池的有前途的电解质。然而，由于固体聚合物电解质的低室温离子电导率和陶瓷无机电解质的固有脆性，它们的可靠和可扩展的制备仍然存在挑战。在本文中，开发了一种简单且具有成本效益的形态发生路线，用于通过使用脱脂棉作为模板来制造分级纳米结构的3D石榴石型Li 7 La 3 Zr 2 O 12整料。3D Li+导电框架的纳米结构化在基于聚环氧乙烷的复合电解质中提供了互连和连续的Li+传输路径。所制造的固态复合电解质是柔性的，并且表现出0.89 × 10−4 S cm−1的增强的Li离子电导率以及高达5.5 V（相对于Li/Li+）的大的稳定电化学窗口。使用3D结构电解质的对称锂电池在不同电流密度下显示出良好的循环稳定性。LiFePO4（+）|混合电解质|在30 °C下工作的锂（−）电池具有出色的倍率性能和循环性能，并在0.2 C（1 C = 170 mA g−1）的电流密度下提供接近100%的高库仑效率。目前的制造路线简单有效，有望扩大生产。
Solid‐state lithium‐ion‐conducting membranes are emerging as a promising electrolyte for rechargeable lithium batteries. However, their reliable and scalable preparation still remain challenges, due to low room‐temperature ionic conductivity of solid polymer electrolytes and inherent brittleness of ceramic inorganic electrolytes. Herein, a simple and cost‐effective morphogenetic route is developed for fabricating hierarchically nanostructured 3D garnet‐type Li7La3Zr2O12 monoliths by using degreasing cotton as a template. Nanostructuring of 3D Li+‐conducting frameworks offers interconnected and continuous Li+‐transport pathways in a poly(ethylene oxide)‐based composite electrolyte. The as‐fabricated solid‐state composite electrolyte is flexible and exhibits an enhanced Li‐ion conductivity of 0.89 × 10−4 S cm−1 as well as a large stable electrochemical window up to 5.5 V versus Li/Li+. The symmetric lithium cell using the 3D‐architectured electrolyte shows good cycling stability at different current densities. Furthermore, the LiFePO4 (+) | hybrid electrolyte | Li (−) battery working at 30 °C exhibits outstanding rate capability and cyclability and delivers a high coulombic efficiency of nearly 100% at a current density of 0.2 C (1 C = 170 mA g−1). The present fabrication route is easy and effective and holds promise for scaled‐up production.