A Systematic Investigation of Polymer Binder Flexibility on the Electrode Performance of Lithium-Ion Batteries

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• 作者：Neslihan Yuca ; Hui Zhao ; Xiangyun Song ; Murat Ferhat Dogdu ; Wen Yuan ; Yanbao Fu ; Vincent S. Battaglia ; Xingcheng Xiao ; Gao Liu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2014
• 出版时间：October 8, 2014
• 年：2014
• 卷：6
• 期：19
• 页码：17111-17118
• 全文大小：523K
• ISSN：1944-8252

文摘

The mechanical failure at the electrode interfaces (laminate/current collector and binder/particle interfaces) leads to particle isolation and delamination, which has been regarded as one of the main reasons for the capacity decay and cell failure of lithium-ion batteries (LIBs). Polymer binder provides the key function for a good interface property and for maintaining the electrode integrity of LIBs. Triethylene glycol monomethyl ether (TEG) moieties were incorporated into polymethacrylic acid (PMAA) to different extents at the molecular level. Microscratch tests of the graphite electrodes based on these binders indicate that the electrode is more flexible with 5 or 10% TEG in the polymer binders. Crack generation is inhibited by the flexible TEG-containing binder, compared to that of the unmodified PMAA-based electrode, leading to the better cycling performance of the flexible electrode. With a 10% TEG moiety in the binder, the graphite half-cell reaches a reversible capacity of >270 mAh/g at the 1C rate, compared to a value of 鈭?90 mAh/g for the unmodified PMAA binder.

Keywords:

polymer binder; flexibility; graphite anode; lithium-ion battery