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A separator modified by high efficiency oxygen plasma for lithium ion batteries with superior performance

机译：经高效氧等离子体改性的锂离子电池隔膜，性能卓越

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In order to improve the electrochemical performance of Li-ion batteries, especially at elevated temperatures, we, for the first time, modified the separator with the oxygen plasma method. Physical characterization including the contact angle measurement and Fourier transform infrared spectrometer analysis indicate that the O-2 plasma treatment can generate oxygen-containing groups on the surface of separator. The Li-ion battery using the O-2 plasma modified separator shows superior performance with a higher initial capacity (135.7 mA h g(-1)) and significantly improved cycling stability (maintaining 96.98% of its initial discharge capacity after 100 cycles), because of the presence of oxygen containing groups such as carbonyl and hydroxyl on the surface of the separator after the plasma modification. Moreover, when cycled at 1C, the discharge capacity of the Li-ion battery using a normal separator is only 86.7 mA h g(-1) whereas the Li-ion battery with the modified separator shows a much higher discharge capacity of 135.7 mA h g(-1), indicating an excellent rate performance due to the electrostatic repulsion between electronegative oxygen functional groups on the surface of modified separator. When tested at an elevated temperature (55 degrees C), the capacity retention of the cell using the modified separator is much higher (85.39%) than that of the normal separator (53.69%). All the tests show that the oxygen functional groups on the surface of the separator by the oxygen plasma modification play a critical role in improving the electrochemical performance of the Li-ion battery.
机译：为了改善锂离子电池的电化学性能，尤其是在高温下，我们首次使用氧等离子体方法对隔膜进行了改进。包括接触角测量和傅立叶变换红外光谱仪分析在内的物理表征表明，O-2等离子体处理可在隔板表面生成含氧基团。使用O-2等离子改性隔膜的锂离子电池具有更高的初始容量（135.7 mA hg（-1））和更高的循环稳定性（在100次循环后仍保持其96.98％的初始放电容量），因此性能优越。等离子体改性后在隔板的表面上存在含氧基团如羰基和羟基的示意图。此外，当在1C下循环时，使用常规隔膜的锂离子电池的放电容量仅为86.7 mA hg（-1），而带有改进型隔膜的锂离子电池的放电容量更高，为135.7 mA hg（-1）。 -1），表示由于改性隔板表面上的负电性氧官能团之间的静电排斥而具有优异的速率性能。在高温（55摄氏度）下进行测试时，使用改良型隔膜的电池容量保持率（85.39％）比普通隔膜（53.69％）高得多。所有测试表明，通过氧等离子体改性而在隔板表面上的氧官能团在改善锂离子电池的电化学性能中起关键作用。

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