Layer-by-Layer Deposition of Organic鈥揑norganic Hybrid Multilayer on Microporous Polyethylene Separator to Enhance the Electrochemical Performance of Lithium-Ion Battery

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• 作者：Wuxia Xu ; Zhuyi Wang ; Liyi Shi ; Ying Ma ; Shuai Yuan ; Lining Sun ; Yin Zhao ; Meihong Zhang ; Jiefang Zhu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：September 23, 2015
• 年：2015
• 卷：7
• 期：37
• 页码：20678-20686
• 全文大小：754K
• ISSN：1944-8252

文摘

A simple layer-by-layer (LbL) self-assembly process of poly(acrylic acid) (PAA) and ZrO₂ was applied to construct functional ultrathin multilayers on polyethylene (PE) separators without sacrificing the excellent porous structure of separators. Such PAA/ZrO₂ LbL-modified PE separators possess good electrolyte wettability, excellent electrolyte uptake, high ionic conductivity and large Li⁺ transference number. More importantly, the top layer of LbL self-assembly would affect the dissociation of electrolyte and the formation of solid electrolyte interphase (SEI) layer in half-cells. Compared with the pristine and (PAA/ZrO₂)₁PAA-modified PE separators, (PAA/ZrO₂)₃-modified PE separator shows a larger Li⁺ transference number (0.6) and a faster tendency to form a stable SEI layer, endowing half-cells with excellent capacity retention at high C-rates and superior cycling performance. These fascinating characteristics will provide the LbL self-assembly with a promising method to improve the surface property of PE separators for high performance lithium-ion batteries.