摘要: The rapid growth of the world economy,the day-to-day development of science and technology,and the continuing progress of living standards in modern society have indeed caused an increase in the need for energy.The widespread usag... 展开 The rapid growth of the world economy,the day-to-day development of science and technology,and the continuing progress of living standards in modern society have indeed caused an increase in the need for energy.The widespread usage of fossil fuels to meet global energy needs generates thousands of tons of carbon dioxide(CO2)and other pollutants yearly,accelerating global warming and causing significant climate change.Renewable energy sources such as wind,solar,and geothermal energy are viable alternatives to fossil fuels to reduce serious environmental risks.To integrate and distribute energy supply,these renewable energies require effective,advanced,and highly efficient electrochemical energy storage devices.The demand for energy storage devices,for example,lithium/sodium-ion batteries(LIBs/NIBs)for hybrid electric vehicles(HEVs)and autonomous electrical appliances,has increased rapidly over the past decade due to their high power density,long cycle life,extraordinary coulombic efficiencies,minimal memory effects,and environmental friendliness.The typical components of LIBs and NIBs batteries are electrodes(cathode and anode),electrolytes,and a microporous separator. Microporous membrane separators(MMS)are at the heart of rechargeable LIBs and NIBs because they prevent short circuits and serve as a channel for ion transport during charge-discharge operations.Despite being an inactive section of the battery,the membrane separator''s structure and properties have a significant impact on the battery''s safety,electrochemical performance,and reusability.Regardless of the abundance of commercially available separators,their thermal stability and service life severely limit the battery''s efficiency and reliability.Although no ideal separator can still provide optimal electrochemical performance,and safety under all operating conditions,most efforts to find alternatives to polyethylene(PE)separators have failed because they are still preferable to other separators when all criteria are evaluated.Polyethylene-based membrane separators are favourable for LIBs and NIBs batteries but suffer from inherent hydrophobic behaviour that permits poor electrolyte absorption,and low thermal stability causes an inevitable dimensional shrinkage at high temperatures.Continuous efforts have been made to modify PE separators to increase safety and improve electrochemical performance.In this thesis,we overview the state-of-the-art fundamental requirements and properties of ideal separators for LIBs and NIBs.Correspondingly,in-depth descriptions of the fabrication and development of hybrid composite separators based on porous polyethylene(PE)membranes for rechargeable lithium-ion(Li-ion)andsodium-ion(Na-ion)batteries are provided. Finally,a novel PE-based membrane modified with a hybrid organic-inorganic coating layer for lithium-/sodium-metal(LMBs/NMBs)batteries is fabricated.The advanced separator is developed by incorporating heat-resistant boehmite(BH)and multipolar self-polymerizing dopamine(DA)into biaxially oriented poly(ethylene)via a facile and in-situ solvent methodology with the help of corona discharge activation and pre-treatment.The advanced separator can promote rapid electrolyte absorption,accelerate Li+/Na+ transference without sacrificing the macrostructure and physiochemical properties of the matrix,and endow excellent dimensional stability(～0％)at temperatures higher than 140℃.LMB cells(Li ‖LiFePO4)employing the hybrid separator endow outstanding life span stability and excellent capacity retention of approximately～88 ％ after 500 cycles at a C-rate of(1C).And the hybrid separator can also operate stably under the sodium metal battery system.This work presents an efficient and scalable strategy for constructing safe,long-life next-generation batteries. 收起