Multiscale Structural Gel Polymer Electrolytes with Fast Li~+ Transport for Long-Life Li Metal Batteries

摘要

Li metal batteries (LMBs) are considered as promising candidates for future rechargeable batteries with high energy density. However, Li metal anode (LMA) is extensively sensitive to general liquid electrolytes, leading to unstable interphase and dendrites growth. Herein, a novel gel polymer electrolyte consisting of a micro-nanostructured poly(vinylidene fluoride-cohexafluoropropylene) matrix and inorganic fillers of Zeolite Socony Mobil-5 (ZSM-5) and SiO_2 nanoparticles, is fabricated to expedite Li+ ions transport and suppress Li dendrite growth. Due to the Lewis acid interaction, SiO2 can absorb amounts of PF_6~? and promote the dissociation of LiPF_6. The specific sub-nanometer pore structure of ZSM-5 greatly enhances the Li~+ ion transference number. These structures can restrain the decomposition of electrolytes and build stable interphase on LMA. Therefore, the Li||Ni_(0.8)Co_(0.1)Mn_(0.1)O_2 full cell maintains 92% capacity retention after 300 cycles at 1 C (1 C ≈190 mAh g~(?1)) in carbonate electrolyte. This multiscale design provides an effective strategy for electrolyte exploration in high-performance LMBs.