Preparation And Research Of Flexible Lithium Ion Battery Anode Material And Bone Tissue Repair Scaffold Material By Electrostatic Spinning Method

Electrostatic spinning technology can produce uniform and continuous nanofibers on a large scale,with diameters ranging from ten nanometers to several microns.Moreover,the technology has low cost,simple process and easy preparation process,which has great advantages in the preparation of nanofiber materials.There are many kinds of electrospinning fibers,not just polymer nanofibers with single composition and function.In order to meet the various requirements of practical application,not only multi-component polymer composite nanofibers have been studied,but also inorganic nanofibers and polymer/inorganic composite nanofibers with different properties have been successfully prepared and widely used through various inorganic doping or heat treatment processes.The collected fibers also have a unique three-dimensional porous network structure and a certain nanometer effect,which makes them have broad application prospects in energy storage,sensors,catalysis,filtration,biomedicine,flexible devices and other fields.In this paper,we mainly studied the application of electrospinning composite nanofibers of different components in flexible and non-binder anode materials for lithium ion batteries and bone tissue repair scaffolds:（1）Flexible,binder-free silicon/carbon anode material for lithium ion battery.The development of science and technology puts forward new requirements for the development of flexible energy storage equipment:capacity,stability and flexibility.By simple electrostatic spinning method,independent electrodes without binder and other inactive components were prepared,and high capacity silicon（Si）was combined with carbon（C）material to improve the specific capacity of the electrode.In order to overcome the agglomeration and volume expansion of Si nanoparticles（Si NPs）and improve the electrode stability,80 nm Si was selected and coated with a layer of silica（Si O₂）to limit the volume expansion of Si and improve the dispersion of Si NPs.Si@Si O₂particles were dispersed in polyacrylonitrile（PAN）solution and electrospun to obtain a three-dimensional porous fiber network,which can effectively alleviate the volume expansion.The novel process of"pre-oxidation-slicing-carbonization"can further improve the flexibility and structural integrity of the electrode.Finally,the obtained Si@Si O₂@CNFs fiber film has excellent flexibility and electrochemical performance as a flexible,binder-free lithium ion battery Si/C anode material.（2）Polycaprolactone/chitosan-silica bone tissue repair scaffold.Traditional methods of bone tissue repair（autogenous bone grafts or bone graft substitutes）are associated with severe complications or immune rejection.Research in tissue engineering provides a better way to repair bone tissue defects.In this paper,the bone tissue repair scaffolds were prepared by electrostatic spinning method.We combined the mechanical properties of polycaprolactone（PCL）with the antibacterial and hydrophilic properties of chitosan（CS）to obtain a fully functional PCL/CS fiber.In addition,the Si O₂gel balls,as bone growth factors,were electrospun into the fibers uniformly by electrostatic spinning method,and the bone tissue repair scaffold obtained had an excellent promotion effect on the adhesion,growth and proliferation of human mesenchymal stem cells.