Heterostructured Gel Polymer Electrolyte Enabling Long-Cycle Quasi-Solid-State Lithium Metal Batteries

作者：Shao‐Lun Cui, WU XUE-WEN, Yang Yang, Minfei Fei, Sheng Hong Liu, Guoran Li, Xueping Gao · 发表于：ACS Energy Letters · 年份：2021 · DOI：10.1021/acsenergylett.1c02233 · 被引用次数：120 · 研究领域：Advancements in Battery Materials、Advanced Battery Materials and Technologies、Advanced Battery Technologies Research

For rechargeable lithium–metal batteries (RLBs), gel polymer electrolytes (GPEs) are a very competitive and pragmatic option because the special composite structure could restrain the uncontrolled lithium dendrite in a liquid electrolyte and avoid the poor interface contact for a solid-state electrolyte. However, the difficulty lies in finding a delicate balance between ion transport and interface stability. Herein, a heterostructured GPE, in which a metal–organic framework layer and an ultrathin Al 2 O 3 deposition are coated on the same side of a polymer matrix, is fabricated to homogenize lithium ion transport and stabilize the lithium anode interface. With the heterostructured GPE, the Li + transference number is improved to 0.74, and the lithium metal electrode displays an enhanced cycle stability over 1000 h. Moreover, Li-rich Mn-based layered oxides, the high-capacity cathode material, are matched for the first time with a lithium–metal anode to assemble a quasi-solid-state RLB, which delivers an initial discharge capacity of 257.5 mAh g –1 with a long-cycle capacity retention of 84.6% after 500 cycles at a rate of 0.2C.