摘要
研究了正极片的不同辊压厚度对其制作的电池内阻及循环前后内阻变化的影响。采用场发射电子显微镜(FE-SEM)、X-射线光电子能谱仪(XPS)及感应耦合等离子体原子发射光谱仪(ICP)等测试手段对循环前后的锂离子电池电极材料进行了表征。结果表明,正极片的辊压厚度影响着活性物质与集流体之间的接触电阻;辊压厚度较大正极片制作的电池经循环后,其电池正极表面产生了明显的裂纹,而产生该现象的最主要原因是电池正极处的铁离子溶解进入电解液后沉积于负极表面。
The resistance of lithium-ion cell before and after cycles was affected by the rolling thickness of the cathode electrode.The characteristics of structure and morphology were investigated by scanning electron microscope（SEM）,inductive coupled plasma emission spectrometer（ICP）,and X-ray photoelectron spectrometer（XPS）.The results showed that the rolling thickness affected contact resistance between active material and collector.Contact resistance increase of the cell was in relationship with cycle number and the battery cathode surface produced obvious cracks.The surface components were the deposition of dissolved Fe cations from the cathode.
出处
《金属功能材料》
CAS
2015年第4期31-34,共4页
Metallic Functional Materials
基金
国家863计划项目(2012AA110407)
安徽省科技攻关项目(1301021011)
