作　　者： ; ; ; ; ;

机构地区： 华南师范大学物理与电信工程学院

出　　处： 《电池工业》 2013年第3期142-146,共5页

摘　　要： 采用磁控溅射的方法,制备了SnAl/Ni双层结构薄膜负极材料,通过XRD检测样品的物相结构,并通过组装半电池测试材料的循环稳定性。XRD结果表明:制备所得的双层结构薄膜样品主要为Ni3Sn2与Cu40.5Sn11的固溶相,不同溅射功率下样品的结晶化程度也不一样。循环性能测试结果表明:Ni溅射功率为100W的样品50次循环后充放电比容量维持在500mAh/g左右,具有较好的循环性能。掺Ni后形成的Sn-Ni-Al负极材料的循环稳定性与结晶化程度有关,结晶化程度越差的样品,由于结晶的不规则性,引入更多的嵌锂间隙位置,便于锂离子的进出,获得越好的循环性能。其次对于Sn-Ni-Al负极,多个二元相固溶时,由于非活性物质对循环时的体积变化具有一定的缓解作用,多个二元相作用叠加,导致循环稳定性优于三元合金相。在合成多元合金负极时,非晶化及多个二元相的固溶都是有利于循环稳定性提高的方法之一。本文为Sn基合金负极的改性研究提供了一个新的手段。 In this paper, SnA1/Ni film anode materials with double-layerd structure were synthe sized by magnetron sputtering. And the phase structures were tested by XRD, while the mor- phologies were tested by SEM. The XRD test results showed that the samples were mainly solid solution phases of Ni3Sne and Cu40. sSnll. The crystallization degrees were different with different sputtering power. The cyclic performance tested results showed that the discharge capacity of the sample with sputtering power of 100W stayed about 500 mAh/g after 50 cycles, exhibiting thebest cyclic performance. The cyclic performance of the Sn-Ni-A1 alloy connected with the crystal- lization degree, which come out to be better with lower crystallization degree. For Sn-Ni A1 an ode materials,when the materials were solid solution phases of several binary alloys, because of the mitigative effect from the in-active elements on the volume change, the cyclic performance of the materials were better than Sn-Ni-A1 ternary alloy phases. Non-crystallization and solid solu- tion phases of several binary alloys are ways to improve the cyclic performance when synthesizing multicomponent alloy anode materials. It provide new ways in the modification of Sn-based anode materials.

关 键 词： 掺 改性 合金 锂离子电池 负极材料

领　　域： [电气工程]