复合数
插层(化学)
钾
阴极
材料科学
氧化物
离子
透射电子显微镜
扫描电子显微镜
纳米技术
化学工程
化学
复合材料
冶金
无机化学
工程类
有机化学
物理化学
作者
Liping Duan,Caojie Shao,Jiaying Liao,Lili Song,Yingna Zhang,Ren‐Ke Li,Shaohua Guo,Xiaosi Zhou,Haoshen Zhou
标识
DOI:10.1002/anie.202400868
摘要
Layered transition metal oxides are extensively considered as appealing cathode candidates for potassium-ion batteries (PIBs) due to their abundant raw materials and low cost, but their further implementations are limited by slow dynamics and impoverished structural stability. Herein, a layered composite having a P2 and P3 symbiotic structure is designed and synthesized to realize PIBs with large energy density and long-term cycling stability. The unique intergrowth of P2 and P3 phases in the obtained layered oxide is plainly characterized by X-ray diffraction refinement, high-angle annular dark field and annular bright field-scanning transmission electron microscopy at atomic resolution, and Fourier transformation images. The synergistic effect of the two phases of this layered P2/P3 composite is well demonstrated in K+ intercalation/extraction process. The as-prepared layered composite can present a large discharge capacity with the remarkable energy density of 321 Wh kg-1 and also manifest excellent capacity preservation after 600 cycles of K+ uptake/removal.
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