欢迎访问球探体育!

郑洪河教授课题组在Journal of Power Sources (IF 4.951 ,一区)上发表研究论文

来源:球探体育比分老版本 发布者:系统管理员发布时间:2015-03-05浏览次数:731

标    题:
Calendering effects on the physical and electrochemical properties ofLi[Ni1/3Mn1/3Co1/3]O2 cathode
作    者:

Honghe Zheng?, Li Tan, Gao Liu, Xiangyun Song, Vincent S. Battaglia
论文摘要:

Li[Ni1/3Mn1/3Co1/3]O2 cathode laminate containing 8% PVDF and 7% acetylene black is fabricated and calendered to different porosities. Calendering effects on the physical and electrochemical properties of the Li[Ni1/3Mn1/3Co1/3]O2 cathode are investigated. It is found that mechanical properties of the composite laminate strongly depend on the electrode porosity whereas the electronic conductivity is not significantly affected by calendering. Electrochemical performances including the specific capacity, the first coulombic efficiency, cycling performance and rate capability for the cathode at different porosities are compared. An optimized porosity of around 30–40% is identified. Electrochemical impedance spectroscopy (EIS) studies illustrate that calendering improves the electronic conductivity between active particles at relatively high porosities, but increases charge transfer resistance at electrode/electrolyte interface at relatively low porosities. An increase of activation energy of Li interfacial transfer for the electrode at 0% porosity indicates a relatively high barrier of activation at the electrode/electrolyte interface, which accounts for the poor rate capability of the electrode at extremely low porosity.

原文链接:
http://dx.doi.org/10.1016/j.jpowsour.2012.02.001