锡铜合金负极材料的电化学性能  

Electrochemical Performance of Tin-copper Alloy Negative Materials

作　　者：成月[1] 童庆松[1] 施继承[1] 程林[1] 黄熠[1] 郑立群[1] 

机构地区：[1]福建师范大学化学与材料学院,福州350007

出　　处：《无机化学学报》2007年第3期456-460,共5页Chinese Journal of Inorganic Chemistry

基　　金：教育部重点资助项目(No.03065;JA02159);福建省自然科学基金项目(No.E0510014);福建省科技厅项目(No.2005K012)资助

摘　　要：将碱性镀液中制备的锡．铜膜在不同温度下烧结，制得几种锡铜合金负极材料。研究表明，在200℃烧结的锡铜合金具有单斜CucSns（C2／c空间群）型结构，晶胞体积大。在充放电过程中结构稳定。在0．03～2．0V电压区间，该样品第1循环的放电容量为503mAh·g^-1，40次循环的容量衰减率为33％。随着充放电循环的进行，放电电压平台略有升高。电荷传递阻抗是控制样品放电过程的主要因素。原子力显微图像表明，样品的表面是由高120nm、直径20～50nm的圆柱状颗粒组成。By sintering the tin-copper films electroplated from an alkaline solution under different temperatures, several kinds of the tin-copper alloy negative electrodes were prepared. The results show that the tin-copper alloy sintered at 200 ℃ with a monoclinic structure of Cu6Sn5 （Space group： C2/c ） exhibits large crystal cell and stable structure during the charge-discharge cycles. The sample exhibits a discharge capacity of 503 mAh·g^-1 in the 1st cycle and the capacity fade rate is 33% after 40 cycles in the voltage region of 0.03 to 2.0 V. The voltage on the discharge platform is gradually raised during the charge-discharge cycles. The charge transfer impedance is a main factor to control discharge process. The atom force microscope image shows that the sample particles are cylinder with a height around 120 nm and a diameter around 20 to 50 nm.

关 键 词：碱性溶液 锂离子电池 锡铜合金 负极材料 

分 类 号：O614.121[理学—无机化学] O614.432[理学—化学]