Electrochemical Performance Of Co-Sn Alloys Doped Rare Earth Elements As Anode Materials For Li-ion Batteries

RECo_5-xSn_x（3≤x≤4.5, RE: La, Ce, Pr） alloys was synthesized by vacuum melting,Through mechanical grinding and ball milling under Ar gas atmosphere, the alloysparticles became to nano scale. The alloys structure was characterized by XRD. Theresults show that the RE₃Co₄Sn₁₃alloy was found in RECo_5-xSn_x（3≤x≤4.5） alloys, and theRE3Co4Sn13alloys is dominant in the RECoSn₄. The alloy morphology was observed bySEM. The results show that the alloy particles look large and are un-uniform before ballmilling. After ball milling, the alloys particles size significantly became smaller, particlesize is uniform, about 120-180 nm, and agglomeration appears slightly between theparticles. And the agglomeration has the obvious gap between the particle groups.LaCoSn₄, CeCoSn₄, PrCoSn₄element composition was measured by EDS.By charge-discharge testing electrochemical properties was studied. The results showthat the RECoSn₄alloys has a good cycling performance. The first charge capacity ofLaCoSn₄alloy is 632.9 mAh/g and the initial discharge capacity is 384.79 mAh/g. Thefirst charge capacity of CeCoSn₄alloy is 612 mAh/g, and the initial discharge capacity is406 mAh/g. The first charge capacity of PrCoSn₄alloy is 683.761 mAh/g, and the initialdischarge capacity is 558.49 mAh/g. The PrCoSn₄cycle performance is the best during thementioned alloys above.