Efficient room-temperature solid-state lithium ion conductors enabled by mixed-graft block copolymer architectures
Efficient room-temperature solid-state lithium ion conductors enabled by mixed-graft block copolymer architectures
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DOI：
10.1016/j.giant.2020.100027
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发表时间：
2020-08
期刊：
影响因子：
7
通讯作者：
Xiao Ji;Mengxue Cao;Xiaowei Fu;Ruiqi Liang;An N. Le;Qiuting Zhang;Mingjiang Zhong
中科院分区：
文献类型：
--
作者：
Xiao Ji;Mengxue Cao;Xiaowei Fu;Ruiqi Liang;An N. Le;Qiuting Zhang;Mingjiang Zhong
在广泛的室温环境下，锂离子（Li+）在固态聚合物基质导体中的快速输运是迫切需要的，但仍然是一个艰巨的挑战。在此，我们设计了一类基于混合接枝嵌段共聚物（mgbcp）的固态电解质，该聚合物含有短聚环氧乙烷（PEO）和聚二甲基硅氧烷（PDMS）侧链。PEO与PDMS的强不混溶导致形成有序的相分离纳米结构。在PEO/PDMS块体的不同体积分数下，观察到不同的形态，包括双陀螺、六边形穿孔片层、六边形填充柱和片层。通过改变PEO侧链长度和与游离PEO链共混，研究了PEO链迁移率对Li+输运的影响。我们证明了mgbcp与自由无定形PEO链的物理共混显著促进了Li+的导电，并制备了室温电导率高达2.0 × 10−4S/cm的固态电解质。
Fast lithium ion (Li+) transport in solid-state polymer-matrix conductors is in desperate demand in a wide range of room-temperature scenarios but remains a formidable challenge. Herein, we designed a class of solid-state electrolytes based on mixed-graft block copolymers (mGBCPs) containing short poly(ethylene oxide) (PEO) and polydimethylsiloxane (PDMS) side chains. The strong immiscibility of PEO and PDMS resulted in the formation of ordered phase-separated nanostructures. Diverse morphologies, including double gyroids, hexagonally perforated lamellae, hexagonally packed cylinders, and lamellae, were observed at different volume fractions of PEO/PDMS blocks. The impact of chain mobility of PEO on Li+transport was investigated by varying the length of PEO side chains and blending with free PEO chains. We demonstrated that physically blending mGBCPs with free amorphous PEO chains significantly facilitated the Li+conduction, and a solid-state electrolyte with room-temperature conductivity up to 2.0 × 10−4S/cm was prepared.