Ultrastable Potassium Storage Performance Realized by Highly Effective Solid Electrolyte Interphase Layer
Ultrastable Potassium Storage Performance Realized by Highly Effective Solid Electrolyte Interphase Layer
复制标题
高效固体电解质中间层实现超稳定储钾性能
DOI：
10.1002/smll.201801806
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发表时间：
2018-07-26
期刊：
影响因子：
13.3
通讯作者：
Lu, Bingan
中科院分区：
文献类型：
--
作者：
Fan, Ling;Chen, Suhua;Lu, Bingan
钾离子电池(PIB)由于钾资源丰富，标准电极电位低，近年来受到了极大的关注。尤其是PIBS负极中的固体-电解液界面(SEI)，由于含有高活性的钾，对电池的安全性和循环性能起着至关重要的作用。然而，采用传统电解液的PIBS阳极中的SEI主要由有机物组成，这些有机物与空气和水都具有很高的活性，导致循环性能较差，存在安全隐患。在此基础上，通过优化电解液，在阳极中形成了稳定有效的无机SEI层。如预期的那样，PIB在2000 mA g(-1)下表现出超过14000次循环的超长循环性能和超过99.9%的超高平均库仑效率。
Potassium ion-batteries (PIBs) have attracted tremendous attention recently due to the abundance of potassium resources and the low standard electrode potential of potassium. Particularly, the solid-electrolyte interphase (SEI) in the anode of PIBs plays a vital role in battery security and battery cycling performance due to the highly reactive potassium. However, the SEI in the anode for PIBs with traditional electrolytes is mainly composed of organic compositions, which are highly reactive with air and water, resulting in inferior cycle performance and safety hazards. Herein, a highly stable and effective inorganic SEI layer in the anode is formed with optimized electrolyte. As expected, the PIBs exhibit an ultralong cycle performance over 14 000 cycles at 2000 mA g(-1) and an ultrahigh average coulombic efficiency over 99.9%.