摘要
用扫描电镜、交流阻抗谱和恒流充放电等方法,分析了电解刻蚀集流体铜箔对纳米硅和微晶石墨负极性能的影响。电解刻蚀后,铜箔表面形成了沟壑式形貌,与负极材料紧密接触;以0.1C充放电,纳米硅和微晶石墨负极的首次充放电效率分别提高了7.0%和7.3%,第30次循环的放电比容量分别从192 mAh/g、325 mAh/g提高到217 mAh/g3、58 mAh/g。
The influences of electrolytic etching current collector Cu foil on the electrochemical performance of nano-Si and micro- crystalline graphite anodes were analyzed by SEM, EIS and galvanostatie charge-discharge methods. After electrolytic etching, the morphology of homogeneous ravine was formed on the surface of Cu foils, which gave a tighter contact with the anode materials, when charge-discharge at 0.1 C, the initial charge-discharge efficieneies of nano-Si and microcrystalline graphite anodes were increased 7.0% and 7.3%, respectively, the specific discharge capacities at the 30th cycle were increased from 192 mAh/g and 325 mAh/g to 217 mAh/g and 358 mAh/g,respectively.
出处
《电池》
CAS
CSCD
北大核心
2009年第3期131-134,共4页
Battery Bimonthly
基金
“十一五”科技支撑计划项目(2008BAE60B00)
关键词
集流体
铜箔
电解刻蚀
纳米硅
微晶石墨
负极
current collector
Cu foil
electrolytic etching
nano-Si
mierecrystalline graphite
anode
