Wu Xianyong, Qiu Shen, Liu Yao, Xu Yunkai, Jian Zelang, Yang Jihui, Ji Xiulei, Liu Jun
Materials Science and Engineering Department, University of Washington, Seattle, WA, 98105, USA.
Department of Chemistry, Oregon State University, Corvallis, OR, 97331, USA.
Adv Mater. 2022 Feb;34(5):e2106876. doi: 10.1002/adma.202106876. Epub 2021 Dec 10.
Potassium-ion batteries (KIBs) have attracted wide interest for energy storage because of the abundance of the electrode materials involved; however, their electrochemical performances are far behind what can be achieved from lithium-ion batteries (LIBs) or sodium-ion batteries (SIBs). Herein, key promising electrode and electrolyte materials for potassium-ion batteries are identified, the coupled electrochemical reactions in the cell are investigated, and the compatibility between different materials is demonstrated to play the most important role. K Mn[Fe(CN) ] cathode can deliver a high capacity of ≈125 mAh g and exceptional cycling stability over 61 000 cycles (≈9 months) if the side reactions from the anode can be prevented. Graphite is a good anode material but is subjected to degradation in traditional carbonate electrolytes. New concentrated electrolytes are developed and evaluated. A stable KIB system is demonstrated by coupling a stable K Mn[Fe(CN) ] cathode, a prepotassiated graphite anode with a concentrated electrolyte to achieve a high energy density of ≈260 Wh kg (based on the active mass of cathode and anode) and good cycling of over 1000 cycles.
钾离子电池（KIBs）因其所涉及的电极材料丰富而在能量存储领域引起了广泛关注；然而，它们的电化学性能远远落后于锂离子电池（LIBs）或钠离子电池（SIBs）。在此，确定了钾离子电池关键的有前景的电极和电解质材料，研究了电池中的耦合电化学反应，并证明了不同材料之间的兼容性起着最重要的作用。如果能够防止来自阳极的副反应，KMn[Fe(CN)] 阴极可提供约125 mAh g的高容量，并在超过61000次循环（约9个月）中具有出色的循环稳定性。石墨是一种良好的阳极材料，但在传统碳酸盐电解质中会发生降解。开发并评估了新型浓缩电解质。通过将稳定的KMn[Fe(CN)] 阴极、预钾化石墨阳极与浓缩电解质耦合，展示了一种稳定的钾离子电池系统，以实现约260 Wh kg的高能量密度（基于阴极和阳极的活性质量）以及超过1000次循环的良好循环性能。
