Study On Preparation And Properties Of Structural Energy Storage Composites

With the continuous development of automobile and aerospace,the problem of resource shortage and environmental pollution caused by it is becoming more and more serious.Therefore,the research and development of multifunctional composite materials to reduce the loss of fuel energy and improve the current environmental pollution has become one of the research hotspots at home and abroad.Among the multi-functional composites,structural energy storage carbon fiber composite opens up a new research field for advanced energy storage system.It is a new material integrating structure and function.It can combine the two properties into a single structure and has remarkable mechanical properties and good energy storage performance.At present,the research on structural energy storage composites has just started.There is still a lot of work to be done in terms of energy density,safety,preparation process and application of structural energy storage composites(1)Using 100% activated carbon,50% activated carbon + 50% mesoporous carbon and100% mesoporous carbon as active materials,electrode pastes were prepared according to a certain proportion.Three kinds of electrode sheets with different pastes were prepared by wet electrode preparation process,and the prepared positive and negative plates were assembled into energy storage core supercapacitors for performance testing.The results show that the specific capacitance of electrode sheet prepared with 100% activated carbon as active material can reach 94.2F/g;the specific capacitance of electrode sheet prepared with 50% activated carbon + 50% mesoporous carbon as active material can reach 78.8F/g;the specific capacitance of electrode sheet prepared with 100% mesoporous carbon as active material can reach 64.7F/g.(2)The ultra-thin thermal conductive carbon fiber prepreg was prepared.The energy storage core and ultra-thin thermal conductive carbon fiber prepreg were integrated to prepare the structural energy storage composite.The electrochemical performance of the composite was tested.The results show that the fluctuation range of cell capacity before and after integration is within 10%.At the same time,three kinds of flat energy storage composites with different sizes were prepared,and their tensile properties,compressive properties,bending properties and electrochemical properties under different loading conditions were tested.The results show that when the maximum tensile stress is 12.5k N,the capacity retention rate is65%;when the maximum compressive stress is 1.5k N,the capacity retention rate increases by33%;when the maximum bending stress is 1.5k N,the capacity retention rate is 89%.(3)The structural energy storage composite flat car is designed and prepared.The structural energy storage composite is used as the car body,so that it can be used as both the load-bearing component and the power component.Considering the optimization of the internal structure of the structural energy storage composite and its application in new energy vehicles in the future,we analyze the stress distribution and deformation of the structural energy storage composite as the car body The simulation analysis is carried out.The results show that: when the structural energy storage composite panel is used as the main board of the car body,the bending deformation of the composite panel is mainly concentrated in the middle oval area,and the 90 ° direction fiber bears the main stress of the car body uniform load,while the 0 ° direction fiber bears less stress,so the structural energy storage composite panel is applied At present,there is stress concentration in the structure design of the internal grid of the energy storage battery,so the internal structure of the energy storage battery needs to be further improved.