The Multiwalled Carbon Nanotube Films As Cathode Material In Lithium-air Batteries

In recent years,with the gradual depletion of the Earth’s fossil resources,as well as the greenhouse effect,environmental degradation and so on similar issues,people began to turn their attention to their own survival of the planet.With everyone environmental awareness,the use of electric cars and other clean energy vehicles more and more popular.However,pure electric vehicles on a single charge with the number of miles is still far from meeting the requirements of the people.On the other hand,with mobile phones,tablet and other portable electronic devices lighter and thinner toward more powerful direction,the battery performance is also put forward higher requirements,the traditional lithium-ion batteries have started powerless.Theory of lithium-air batteries for its capacity than comparable gasoline and green features attracted wide attention.However,it has some drawbacks in the way this has been to commercialize the battery:discharge product conductivity too low,too high electric potential and the like.Therefore,this article will use benzene as a carbon source,ferrocene as catalyst,thiophene growth promoters,catalysts prepared using mobile MWCNT film and the cathode material used in lithium-air batteries,the use of SEM,Raman spectroscopy,BET,electrochemical test methods to characterize the MWCNT film.Experiments show that the specific surface area of MWCNT film obtained film is about 65 m2/g,its pore structure is mainly composed of mesoporous,wherein the carbon nanotube diameter of about 40 nm.The material at 500 mA/g current density reached 15750 mAh/g of specific capacity and initial charge 13800 mAh/g of the initial discharge capacity.Within the limits of the charge-discharge capacity was 3000 mAh/g premise cycle 15 times more than the capacity it has not decreased significantly.by controlling the molar ratio of ferrocene in benzene,in addition to MWCNT film,it can also obtain carbon fibers.In this paper,these two materials for comparison testing,in-depth analysis of why the MWCNT film electrochemical performance superior to carbon fiber.And take in-depth study of the electrochemical mechanism of lithium-air battery behind.In addition,the paper also discusses why you want to present in a pure oxygen environment on lithium-air battery test,and be able to build a set of pure oxygen under conditions of lithium-air battery testing system.By comparing the same kind of lithium-air batteries manifested in the electrochemical performance under different conditions,the test proved that the system can effectively prevent environmental pollution caused by the lithium-air battery,thereby improving the performance of the battery and the charge-discharge cycle performance.