Fan Ling, Chen Suhua, Ma Ruifang, Wang Jue, Wang Longlu, Zhang Qingfeng, Zhang Erjin, Liu Zhaomeng, Lu Bingan
School of Physics and Electronics, Hunan University, Changsha, 410082, China.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Shanxi, 030001, China.
Small. 2018 Jul;14(30):e1801806. doi: 10.1002/smll.201801806. Epub 2018 Jun 28.
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 and an ultrahigh average coulombic efficiency over 99.9%.
由于钾资源丰富且钾的标准电极电位较低，钾离子电池（PIB）近来受到了极大关注。特别是，由于钾的高反应活性，PIB阳极中的固体电解质界面（SEI）在电池安全性和电池循环性能方面起着至关重要的作用。然而，采用传统电解质的PIB阳极中的SEI主要由有机成分组成，这些成分与空气和水的反应性很高，导致循环性能较差和存在安全隐患。在此，通过优化电解质在阳极中形成了高度稳定且有效的无机SEI层。正如预期的那样，PIB在2000 mA g的电流下表现出超过14000次循环的超长循环性能以及超过99.9%的超高平均库仑效率。
