金属间化合物NiSb_2吸放锂机理

Lithium absorption and release mechanism of intermetallic compound NiSb_2

采用悬浮熔炼和球磨制备了NiSb2 合金粉末 ,并研究了它的电化学吸放锂性能。研究结果表明 ,NiSb2的吸放锂平台分别在 0 .8V和 1.0V。在 2 0mA·g-1的电流密度下 ,首次可逆容量达到 494mAh·g-1,经过 15个循环后 ,仍保持 2 42mAh·g-1的可逆容量。在研究中发现 ,增大电流密度将导致可逆容量的下降。

Intermetallic compound NiSb 2 powder are prepared by levitation melting and ball-milling. The electrochemical lithium absorption / release properties of NiSb 2 as a new lithium-ion batteries anode material were investigated. The experiments show the lithium absorption / release plateaus are at 0.8 V and 1.0 V respectively. It is found that the first reversible capacity of NiSb 2 electrode reaches 494 mAh·g -1 at a current density of 20 mA·g -1 , and the capacity of about 242 mAh·g -1 is still maintained even after 15 times cycling. But we also find that the reversible capacity decreases at the increased charge-discharge current density.