Preparation And Energy Storage Application Of Si/ZnO-based Composite Carbon Nanofibers

With the continuous development of renewable energy,there is an urgent need for high energy density lithium metal batteries(LMBs)energy storage.Combining the traditional dyeing and finishing industry with the emerging new energy industry not only promotes the development of the textile industry,but also promotes the innovation of the new energy industry.This research takes electrospun carbon nanofibers(CNF)as the object and takes the application of lithium metal battery anode as the starting point,combines the advantages of high lithium storage capacity and lithium-philic properties of Si and ZnO,and the structure shaping ability of CNF,giving CNF excellent energy storage function.By analyzing the relationship between the structure and energy storage function of Si and ZnO-based composite carbon nanofibers with different contents,the energy storage mechanism is discussed.The first chapter introduces the research background and working principle of lithium metal batteries,then explains the future development and existing problems of lithium metal batteries and carbon nanofibers,and finally briefly describes the applications of Si and ZnO in energy storage and the processing of carbon materials.Based on the application of the field,the research significance and research content of this article are proposed.The second chapter,preparation and application of composite lithium metal anode based on 3D Si/ZnO framework.Through a simple molten lithium-pouring method,different ratios of Si and ZnO are selected to fabricate Li/Si/ZnO(LiSZ)composite anode.During the symmetrical battery cycle,the 3D LiSZ anode has long cycle stability(950 h)and low voltage hysteresis(23 m V).The LFP full battery exhibits a high capacity retention rate of 95.24%after 260 cycles at 2 C.The good electrochemical performance of the battery is attributed to the good mechanical strength and stress-strain resistance of the LiSZ composite anode.During the battery cycle,the volume expansion of lithium and the growth of dendrites can be inhibited.When Liis stripped off,the exposed lithium-philic Li₂₁Si₅ and LiZn alloy framework can induce uniform deposition of Li⁺,thereby accommodating more Limetal.The third chapter,the preparation and energy storage function of acrylic fiber-based Si/ZnO composite carbon nanofibers.Using civilian acrylic fiber as a carbon source,Si and ZnO are mixed with it through an electrospinning method;then Si-ZnO-CNF is prepared through steps such as pre-oxidation and carbonization.The composite CNF can provide a good conductive grid for the transmission of ions or electrons during the half-cell cycle.The lithium-philic Si and ZnO nanoparticles can be uniformly dispersed on the CNF,acting as Li⁺nucleation sites,and maintaining the stability of the SEI film.Electrochemical studies have shown that the composite material can still maintain a coulombic efficiency of 93.33%after 150 cycles at a current density of 1 m A cm^-2.In addition to the above advantages,the good self-supporting ability of the composite CNF is also crucial,and it can provide a stable place for Lidepositing/stripping.The fourth chapter systematically summarizes the research results of this paper,points out the deficiencies in the research work,and proposes future development directions and suggestions.