Study On Mechanical Properties Of Carbon Nanotube Film Materials

Flexible lithium-ion battery is a high energy density,good cycle performance,thin and flexible electrochemical energy storage components,carbon nanotube film has good flexibility,high specific surface area and high conductivity,is a Kind of ideal electrode material.When the carbon nanotube film is used as an electrode material,it is required to fully understand the mechanical properties of the electrode material when working in a wet environment.In this paper,macroscopic tensile and in situ micro-Raman spectroscopy was used to study the mechanical properties and microscopic mechanism of carbon nanotube films under different wet conditions.The main achievements of this paper are as follows:?1?The experimental measurement and analysis of macroscopic tensile mechanical properties of carbon nanotube films under different wet conditions were carried out.The experimental results show that the carbon nanotube film is wetted with three liquids:[PP₁₃]TFSI,BMI·BF4,PC,the Young's modulus and tensile strength are basically the same,and significantly lower than the dry film;The Young's modulus and tensile strength of carbon nanotube films wetted with propylene carbonate for a certain period of time are significantly higher than those of films impregnated with propylene carbonate.Films wetted with propylene carbonate and air dried have a higher Raman shift-strain slope in the first stage of deformation than the propylene carbonate fully wetted film,making the Young's modulus of the air-dried film wet with propylene carbonate.For soaking the film.?2?The tensile-in-situ micro Raman experiments of carbon nanotube films under different wet conditions were carried out,and the load responses of the carbon nanotubes during the tensile loading of carbon nanotube films under different wet conditions were measured.The results show that in the first stage of film deformation,the Raman shift-strain slopes of different liquid-wetted carbon nanotube films are not significantly different from each other,and are significantly smaller than the dry film,indicating that the liquid soaked film is in the stretching process.The deformation of the carbon nanotubes is similar and smaller than that of the dry film,which makes the Young's modulus of the film after being wetted with the liquid to be substantially the same and larger than that of the dry film.?3?Based on the above results of macro-stretch and micro-Raman experiments,the deformation process of CNT bundle network structure in the film and its correlation with the macro-mechanical properties of the film were analyzed,and the mechanical properties of the air-dried film material after propylene carbonate soaking were analyzed.Modeling analysis was performed.