Molecular Brush with Dense PEG Side Chains: Design of a Well-Defined Polymer Electrolyte for Lithium-Ion Batteries
Molecular Brush with Dense PEG Side Chains: Design of a Well-Defined Polymer Electrolyte for Lithium-Ion Batteries
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DOI：
10.1021/acs.macromol.9b01641
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发表时间：
2019-10-08
期刊：
影响因子：
5.5
通讯作者：
Xue, Zhigang
中科院分区：
文献类型：
--
作者：
Li, Shaoqiao;Jiang, Ke;Xue, Zhigang
在此，我们通过几种受控自由基聚合方法设计了一系列具有短而密集接枝聚环氧乙烷（PEO）侧链的明确的瓶刷状大分子，以制备固体聚合物电解质（SPE）。 PEO 侧链可以作为锂盐的良好导体。此外，这些大分子在主链上连接有锂阳离子，可以促进锂离子的传输，从而提高锂离子的迁移数。由于其特殊的结构，所制备的SPE在30℃下表现出4.49 x 10(-5) S cm(-1)的相当大的离子电导率。此外，高容量和优异的循环性能证明了所得电解质在锂离子电池中的可预见的应用。
Herein, we designed a series of well-defined bottlebrush-like macromolecules with short and densely grafted poly(ethylene oxide) (PEO) side chains through several controlled radical polymerization methods to prepare solid polymer electrolytes (SPEs). The PEO side chains can work as sensational conductors for lithium salt. Moreover, these macromolecules own lithium cations linked on the backbone, which can facilitate the transport of Li ions and thus improve the lithium-ion transference number. The prepared SPE exhibits a considerable ion conductivity of 4.49 x 10(-5) S cm(-1) at 30 degrees C owing to its specific structure. Furthermore, the high capacity and excellent cycle performance demonstrate the foreseeable application of the obtained electrolyte in the lithium-ion battery.