Solid-state polymer electrolytes for high-performance lithium metal batteries
Solid-state polymer electrolytes for high-performance lithium metal batteries
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DOI：
10.1038/s41467-019-12423-y
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发表时间：
2019-09-27
影响因子：
16.6
通讯作者：
Archer, Lynden A.
中科院分区：
文献类型：
--
作者：
Choudhury, Snehashis;Stalin, Sanjuna;Archer, Lynden A.
基于碱金属阳极的电化学电池作为潜在的变革性电能储存技术平台，受到了广泛的科学关注。金属阳极在化学、形态、机械和流体动力学方面的不稳定性导致金属电沉积不均匀和阳极可逆性差，这是限制进展的许多已知挑战之一。在这里，我们报告了基于交联聚合物网络的固态电解液可以解决基于锂金属阳极的电池中的所有这些挑战。通过输运和电化学分析，我们表明，操纵共价锚定在网络中的聚合物链段和属于网络孔道中的低聚电解质的“自由”链段之间的热力学相互作用，可以很容易地创建混合电解质，同时表现出类液体的离子传输障碍和类固体的对形态和流体动力学不稳定性的抵抗。
Electrochemical cells based on alkali metal anodes are receiving intensive scientific interest as potentially transformative technology platforms for electrical energy storage. Chemical, morphological, mechanical and hydrodynamic instabilities at the metal anode produce uneven metal electrodeposition and poor anode reversibility, which, are among the many known challenges that limit progress. Here, we report that solid-state electrolytes based on crosslinked polymer networks can address all of these challenges in cells based on lithium metal anodes. By means of transport and electrochemical analyses, we show that manipulating thermodynamic interactions between polymer segments covalently anchored in the network and "free" segments belonging to an oligomeric electrolyte hosted in the network pores, one can facilely create hybrid electrolytes that simultaneously exhibit liquid-like barriers to ion transport and solid-like resistance to morphological and hydrodynamic instability.