离子电导率
Boosting(机器学习)
钾
电导率
金属
离子键合
互惠(文化人类学)
材料科学
固态
化学工程
化学
无机化学
电极
离子
电解质
物理化学
有机化学
计算机科学
冶金
心理学
社会心理学
机器学习
工程类
作者
Xinyuan Zhang,Boqian Yi,Wanqing Jia,Shuoqing Zhao,Serguei V. Savilov,Shiyu Yao,Zhongxiang Shen,Gang Chen,Zhixuan Wei,Fei Du
标识
DOI:10.1002/ange.202413214
摘要
Solid‐state potassium metal batteries are promising candidates for grid‐scale energy storage due to their low cost, high energy density and inherent safety. However, solid state K‐ion conductors struggle with poor ionic conductivity due to the large ionic radius of K+‐ions. Herein, we report precise regulation of phase heterogeneity and reciprocity of the P2/P3‐symbiosis K0.62Mg0.54Sb0.46O2 solid electrolyte (SE) for boosting a high ionic conductivity of 1.6×10‐4 S cm‐1 at 25 °C. The bulk ionic conducting mechanism is explored by elucidating the effect of atomic stacking mode within the layered framework on K+‐ion migration barriers. For ion diffusion at grain boundaries, the P2/P3 biphasic symbiosis property assists in tunning the SE microstructure, which crystallizes in rod‐like particles with lengths of tens of micrometers facilitating long‐distance ion transport and significantly decreasing grain boundary resistance. Potassium metal symmetric cells using the modified SE deliver excellent cycling life over 300 h at 0.1 mA cm−2 and a high critical current density of 0.68 mA cm−2. The quasi‐solid‐state potassium metal batteries (QSSKBs) coupled with two kinds of layered oxide cathodes demonstrate remarkable stability over 300 cycles, outperforming the liquid electrolyte counterparts. The QSSKB system provides a promising strategy for high‐efficiency, safe, and durable large‐scale energy storage.
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