关键词: 锂离子电池, 碳包覆, 锡, 循环性能

Abstract: Carbon coated tin power was prepared by decomposing glucose applying a hydrothermal method, and was further used as the active material for negative electrode of lithium secondary battery. Charge-discharge tests show that the carbon coated tin electrode with the addition of 5 wt.% acetylene black as a conductive agent could obtain an initial discharge capacity of 967 mAh.g^-1 and a discharge capacity of 362 mAh.g^-1 after 50 cycles, which is much higher than that of tin electrode (166 mAh.g^-1 after 50 cycles). The coated carbon hinders the agglomeration of tin powder, reduces the irreversible capacity loss of tin; the addition of acetylene black could reduce the impedance between the electrode and the electrolyte, therefore, improve the transfer property of lithium ions and the electrons within the electrode, which contribute to the higher initial discharge capacity.

Key words: lithium-ion battery, carbon coating, tin, cycle performance