Cuprous Oxide/Copper Particles Prepared by a Facile Wet-Chemical Reduction Approach as Anode Material for Li Ion Batteries
Cu2O/Cu composite particles were successfully synthesized by a novel facile template-free chemical reduction route at room temperature.X-ray diffraction (XRD) results showed that the sample mainly consisted of the Cu2O phase coexisting with a few Cu phases.Scanning electron microscopy (SEM) images indicated that the regular particles with a cubic shape about 2-3 μm is Cu2O.In addition,the electrochemical behavior of the Cu2O/Cu composite electrode and copper electrode during the charging and discharging process were both investigated.It was found that the first discharge capacity of Cu2O/Cu composite electrode was up to 650 mAh·g-1,which is much higher than the theoretical capacity of Cu2O (about 375 mAh·g-1).The additional capacity is attributed to the electrodeposition of lithium on pure copper,confirmed by the electrochemical property of copper as the anode material of the lithium-ion battery.The copper electrode presented a high discharge capacity of 280 mAh·g-1 during the first cycle.However,a large irreversible capacity as same as the cuprous oxide electrode was observed during the first charging process.It is indicated that deposition of lithium on the Cu particle surface acts as a barrier preventing the contact between the Cu and the electrolyte.Furthermore,the Cu2O/Cu composite electrode can exhibit reversible capacity of 210 mAh·g-1 at a charge-discharge rate of 30 mA·g-1 after 40 cycles.
Cu2O/Cu composite Copper Electrochemical property Charge and discharge testing Electrodeposition of lithium
Yajuan Bian Meng Yang Xiangyu Zhao Liqun Ma Chuanwei Jin Yi Ding Xiaodong Shen
State Key Laboratory of Materials-Oriented Chemical Engineering,College of Materials Science and Engineering,Nanjing University of Technology,Nanjing 210009,PR China
国际会议
The 6th Cross-Strait Conference on Advanced Engineering Materials (第六届海峡两岸工程材料研讨会)
南京
英文
28-35
2011-11-08（万方平台首次上网日期，不代表论文的发表时间）