Stabilizing polymer electrolytes in high-voltage lithium batteries
Stabilizing polymer electrolytes in high-voltage lithium batteries
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DOI：
10.1038/s41467-019-11015-0
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发表时间：
2019-07-12
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;Tu, Zhengyuan;Archer, Lynden A.
利用锂和钠阳极的电化学电池正在积极研究其实现高能电池的潜力。基于醚化学的液体和固体聚合物电解质是可充电锂和钠电池的最有前途的选择之一。然而，这些电解质在低阳极电位下的不受控制的阴离子聚合和在最令人感兴趣的阴极化学物质的工作电位下的氧化降解已经导致在该领域中的相当让步，即基于聚合物电解质的固态或柔性电池只能在基于低电压或中等电压阴极的电池中实现。在这里，我们表明，阳离子链转移剂可以通过阻止不受控制的聚合物在阳极的生长来防止醚电解质的降解。我们还报告说，阴极电解质的中间相组成的预成型的阴离子聚合物和超分子提供了一个基本的策略，用于扩展的高电压稳定性的醚基电解质的电位远高于常规接受的限制。
Electrochemical cells that utilize lithium and sodium anodes are under active study for their potential to enable high-energy batteries. Liquid and solid polymer electrolytes based on ether chemistry are among the most promising choices for rechargeable lithium and sodium batteries. However, uncontrolled anionic polymerization of these electrolytes at low anode potentials and oxidative degradation at working potentials of the most interesting cathode chemistries have led to a quite concession in the field that solid-state or flexible batteries based on polymer electrolytes can only be achieved in cells based on low- or moderate-voltage cathodes. Here, we show that cationic chain transfer agents can prevent degradation of ether electrolytes by arresting uncontrolled polymer growth at the anode. We also report that cathode electrolyte interphases composed of preformed anionic polymers and supramolecules provide a fundamental strategy for extending the high voltage stability of ether-based electrolytes to potentials well above conventionally accepted limits.