Carbon-based Catalysts Materials By In Situ Preparation For Li-O₂ Battery

As one of the next-generation energy-storage devices,Li-O2 battery has become the main research direction for the academic researchers due to its characteristics of environmental friendship,relatively simple structures,high energy density of 3500 Wh/kg and low cost.However,Li-O2 battery cannot be commercialized on a large scale because of the challenging issues.Among them,the high over-potential of charge/discharge is the main challenge,and the workable way to solve the above problem is to look for high-efficient catalysts.Based on this,we set from the points of economic efficiency and practicability,we adopted simple method to excite the commonly carbon materials and got the optimal activation method,and we also explored the influences of different carbon materials and activated carbon materials for non-aqueous Li-O2 battery.Firstly,we used the carbon paper as a cathode material for Li-O2 battery,through innovative combination of the embedded mechanism of lithium ion battery.We effectively improved the catalytic performance of carbon paper,and then applied to the Li-O2 battery,which showed a relatively excellent cycle performance and low charge/discharge over-potential.We used the method of control variables,and made a series of electrochemical treatment for carbon paper,respectively under different current ratios and different depth of discharge in lithium ion battery by the carbon paper cathode,which used the current of 0.54 m A and discharge depth of 0.01 V,and obtained the most excellent performance.The Li-O2 battery cycle number improved to 13 th,and charge/discharge over-potential reduced to 3.49 V.Secondly,we combined with the treatment method in the previous chapter,made the electrochemical treatment to four kinds of carbon materials(CNT,Co-CNT,Graphene and Super P)with lithium ion discharge at current of 0.54 mA and discharge depth of 0.01 V,and then used for Li-O2 battery test.Results showed that those four kinds of carbon materials showed poorer performance before they were electrochemical treated,but their catalytic activity and cell cycle performance obviously enhanced after they were electrochemical treated,especially on the battery over-potential,four kinds of carbon materials charge/discharge over-potential reduced 0.75 V on average.