12.6μm-Thick Asymmetric Composite Electrolyte with Superior Interfacial Stability for Solid-State Lithium-Metal Batteries  

作　　者：Zheng Zhang Jingren Gou Kaixuan Cui Xin Zhang Yujian Yao Suqing Wang Haihui Wang 

机构地区：[1]Beijing Key Laboratory for Membrane Materials and Engineering,Department of Chemical Engineering,Tsinghua University,Beijing 100084,People’s Republic of China [2]School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 510000,People’s Republic of China

出　　处：《Nano-Micro Letters》2024年第9期397-409,共13页纳微快报（英文版）

基　　金：the National Natural Science Foundation of China(22178120);the China Postdoctoral Science Foundation(2022TQ0173,2023M731922,2022M720076,BX20220182,2023M731921,2023M731919,2023M741919).

摘　　要：Solid-state lithium metal batteries(SSLMBs)show great promise in terms of high-energy-density and high-safety performance.However,there is an urgent need to address the compatibility of electrolytes with high-voltage cathodes/Li anodes,and to minimize the electrolyte thickness to achieve highenergy-density of SSLMBs.Herein,we develop an ultrathin(12.6μm)asymmetric composite solid-state electrolyte with ultralight areal density(1.69 mg cm^(−2))for SSLMBs.The electrolyte combining a garnet(LLZO)layer and a metal organic framework(MOF)layer,which are fabricated on both sides of the polyethylene(PE)separator separately by tape casting.The PE separator endows the electrolyte with flexibility and excellent mechanical properties.The LLZO layer on the cathode side ensures high chemical stability at high voltage.The MOF layer on the anode side achieves a stable electric field and uniform Li flux,thus promoting uniform Li^(+)deposition.Thanks to the well-designed structure,the Li symmetric battery exhibits an ultralong cycle life(5000 h),and high-voltage SSLMBs achieve stable cycle performance.The assembled pouch cells provided a gravimetric/volume energy density of 344.0 Wh kg^(−1)/773.1 Wh L^(−1).This simple operation allows for large-scale preparation,and the design concept of ultrathin asymmetric structure also reveals the future development direction of SSLMBs.

关 键 词：Solid-state lithium metal batteries Composite solid-state electrolyte Ultrathin asymmetric structure Pouch cells 

分 类 号：TM912[电气工程—电力电子与电力传动] O646[理学—物理化学]