Preparation And Electrochemical Properties Of Coal Based Anode Materials For Lithium-ion Batteries

In this paper,coal based graphitized carbon materials were prepared by carbonization and graphitization with different metamorphism grade coals as raw material,and used as anode materials for lithium ion batteries,the system studied the change of coal based carbon materials with different graphitization temperature under the condition of crystal structure and electrochemical performance of anode materials for lithium ion battery;and the effect of ash on the structure and electrochemical performance of coal based carbon materials were analyzed.With the increase of temperature,the crystal structure of the carbon materials was more and more orderly in the three-dimensional space,and the lamellar structure was formed and changed to the structure of the graphite material gradually.For anthracite,Jiyuan anthracite based carbon materials because of high metamorphic properties were better for Taixi anthracite;Xishan bituminous coal based carbon materials because of having the characteristics of isotropic,and the lithium storage capacity of the materials is enhanced,The first reversible capacity was 325 mAh/g of Xishan bituminous coal graphitized carbon materials at 0.1C,and the reversible capacity at 5C rate was maintained 109.3 mAh/g after 100 cycle times,and both have good performance of high rate and cycle stability;While the crystalline size of low metamorphic grade lignite graphitized materials were relatively small,the graphitization structure of the lignite was not well developed,and the electrochemical performance was poor.After de-ash Jiyuan anthracity and Xishan bituminous coal based carbon materials because of having the characteristics of isotropic,the excellent electrochemical performance.The first reversible capacity was 324.3 mAh/g of 2800 ?de-ashed Jiyuan anthracite at 0.1C,and the reversible capacity at 5C rate was maintained 150 mAh/g after 100 cycle times,this is because after the removal of ash,the material lattice defects increased,the film layer was more smooth,lithium storage space increased,large rate performance were better.