The Effect Of Chemical Corrosion On The Structures And Electrochemical Properties Of Sn-Co Based Anode Material

This paper examines the influence law of the structure and performance based onthe corrosion degrees for two kinds of different materials by using the chemicalcorrosion for Sn-Co-Zn system and Sn-Co-Zn/C system.In Sn-Co-Zn system, the XRD analysis found that the main phase is CoSn phase inSnCoZn_0.2-1, SnCoZn_0.2-2, SnCoZn_0.2-3, SnCoZn_0.2-4and SnCoZn_0.2systems, andthere has CoSn₂phase in SnCoZn_0.2-3, SnCoZn_0.2-4and SnCoZn_0.2systems. Electricalanalysis shows that SnCoZn_0.2-2has the most first charge capacity and dischargecapacity, which are411mAh/g and287mAh/g, respectively. SnCoZn_0.2-3has the bestcirculation, and maintain87.6%of the first reversible capacity after circular25times.In Sn-Co-Zn/C system, the XRD analysis shows that the main phase in ball millsample SnCo/C and corrosion samples SnCoZn_0.05/C, SnCoZn_0.1/C, SnCoZn_0.15/C,SnCoZn_0.2/C are all CoSn phase, and there is a small amount of CoSn₂phase incorrosion samples SnCoZn_0.1/C, SnCoZn_0.15/C, SnCoZn_0.2/C, and there is a smallamount of Co₃Sn₂phase in corrosion samples SnCoZn_0.1/C SnCoZn_0.15/C, SnCoZn_0.2/C. SEM analysis shows that the surface structure and particle size between thecorrosion samples SnCoZn_0.05/C, SnCoZn_0.1/C, SnCoZn_0.15/C, SnCoZn_0.2/C andball mill sample SnCo/C have no obvious difference. Specific surface area analysisshows that the specific surface areas of the corrosion samples SnCoZn_0.05/C,SnCoZn_0.1/C, SnCoZn_0.15/C, SnCoZn_0.2/C are gradually increasing with the increaseof the corrosion degrees, and the specific surface area of the corrosion samples arebigger than that of ball mill sample SnCo/C. Performance analysis shows that thecirculation performance of the corrosion samples SnCoZn_0.05/C, sample SnCoZn_0.1/C,SnCoZn_0.15/C, SnCoZn_0.2/C increases gradually with the deepening of corrosiondegrees, and better than that of the ball mill sample SnCo/C. Along with the increase ofthe corrosion degrees, the first charge and discharge capacity of the corrosion samplesSnCoZn_0.05/C, SnCoZn_0.1/C, SnCoZn_0.15/C, SnCoZn_0.2/C are after rising to drop.