材料科学
钾
水溶液
阴极
化学工程
单斜晶系
离子
化学稳定性
晶体结构
结晶学
有机化学
冶金
物理化学
化学
工程类
作者
Shouxin Zhang,Xin Yang,Ge Sun,Shiyu Yao,Yu Xie,Wei Zhang,Chunbao Liu,Sheng Wang,Rui Yang,Xu Jin,Zexiang Shen,Hong Jin Fan,Fei Du
标识
DOI:10.1002/adfm.202204318
摘要
Abstract Potassium (K)‐based layered oxides are potential candidates for K‐ion storage but they suffer from chemical instability under ambient conditions that deteriorate their performance in rate‐capability and cycle life. To tackle this issue, a facile hydration strategy is employed, in which H 2 O molecules are introduced into the K ion layers of P3‐type K 0.4 Fe 0.1 Mn 0.8 Ti 0.1 O 2 , which induces a phase transition from the hexagonal to monoclinic symmetry accompanied by layer spacing expansion. The hydrated K 0.4 Fe 0.1 Mn 0.8 Ti 0.1 O 2 ⋅ 0.16H 2 O has a strong tolerance to air and can be stored in lab air ambient for 60 days without a change in crystal structure or chemical composition. The K 0.4 Fe 0.1 Mn 0.8 Ti 0.1 O 2 ⋅ 0.16H 2 O electrode shows improved K + mobility and less volume change during potassiation/de‐potassiation. Owing to these merits, K 0.4 Fe 0.1 Mn 0.8 Ti 0.1 O 2 ⋅ 0.16H 2 O as the cathodes for both organic and aqueous potassium‐ion full batteries attain outstanding rate capability and cycling stability (for example, capacity retention of 90% after 1000 cycles). This simple and potent hydration strategy has also been applied to improve the air stability of other K‐based layered oxides, including P3‐K 0.4 MnO 2 and P2‐K 0.5 Cu 0.1 Fe 0.1 Mn 0.8 O 2 , illustrating its usefulness in boosting layered oxides for durable potassium‐ion storage.
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