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Organic‐Inorganic Composite Porous Membrane for Stable and High‐Performance Lithium‐Ion Battery
ChemistrySelect ( IF 1.9 ) Pub Date : 2020-01-24 , DOI: 10.1002/slct.201903876
Wen Lin 1 , Jiajia Jiao 1 , Hao Li 1 , Danpeng Li 1 , Taiyang Zhu 1 , Jiangping Song 1 , Shenqiu Zhao 1 , Weibin Guo 1 , Haolin Tang 1
Affiliation  

The ionic conductivity of the separator is the essential parameter for performance of lithium ion batteries. Herein, we synthesize a new composite separator through coating of the mixture of poly (methyl methacrylate) and alpha alumina on the surface of commercial polyethylene separator. Benefiting from the excellent electrolyte wettability and high ionic conductivity of the poly (methyl methacrylate), the synthesized separator exhibits promising electrochemical properties. The lithium ion diffusion coefficient of the synthesized separator is 1.48×10−15 cm2 s–1, higher than that of the pristine polyethylene separator (0.808×10−15 cm2 s–1). Furthermore, the introduced alumina can prevent the blockage of the ion transport channels from the electrolyte absorption‐induced swelling of poly (methyl methacrylate), which in turn can improve the cycle performance of the thus‐assembled cells. it means that the cell assembled form the synthesized composite separator shows high charge–discharge cyclability, i. e. the cell assembled from the synthesized composite separator maintains 93.9% of initial discharge capacity after 200 charge‐discharge cycles under the rate of 1 C.

中文翻译:

用于稳定和高性能锂离子电池的有机-无机复合多孔膜

隔膜的离子电导率是锂离子电池性能的重要参数。本文中,我们通过在商用聚乙烯隔膜的表面上涂覆聚(甲基丙烯酸甲酯)和α氧化铝的混合物,合成了一种新型复合隔膜。得益于聚甲基丙烯酸甲酯优异的电解质润湿性和高离子电导率,合​​成的隔膜显示出令人鼓舞的电化学性能。合成隔板的锂离子扩散系数为1.48×10 -15  cm 2  s –1,高于原始聚乙烯隔板的(0.808×10 -15  cm 2  s –1)。)。此外,引入的氧化铝可以防止离子迁移通道因电解质吸收引起的聚(甲基丙烯酸甲酯)溶胀而被阻塞,从而可以改善组装电池的循环性能。这意味着从合成复合隔板组装而成的电池显示出高的充放电循环性,即 e。由合成复合隔板组装而成的电池在1 C的速率下经过200次充放电循环后,可保持93.9%的初始放电容量。
更新日期:2020-01-24
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