Insight of K-deficient layered KxMnO2 cathode for potassium-ions batteries

• 作者: Tiezhong Liu Shuang Hou Youpeng Li Shoufeng Xue Junhua Hu Haikuo Fu Chenghao Yang Lingzhi Zhao
• 来源期刊: 能源化学
• 年，卷（期）: 2022,（1）
• 页码范围: 335-343
• 页数: 9页
• 语种: 英文

摘要

Potassium-ions batteries (PIBs) are attracting increasing attention as up-and-coming youngster in large-scale grid-level energy storage benefiting from its low-cost and high energy density.Nevertheless,enough researches regarding indispensable cathode materials for PIBs are badly absent.Herein,we syn-thesize K-deficient layered manganese-based oxides (P2-K0.21MnO2 and P3-K0.23MnO2) and investigate them as cathode of PIBs for the first time.As the newcomer of potassium-containing layered manganese-based oxides (KxMnO2) group,P2-K0.21MnO2 delivers high discharge capacity of 99.3 mAh g-1 and P3-K0.23MnO2 exhibits remarkable capacity retention rate of 75.5％.Besides,in-situ XRD and ex-situ XRD measurements reveal the reversible phase transition of P2-K0.21 MnO2 and P3-K0.23MnO2 with the potassium-ions extraction and reinsertion,respectively.This work contributes to a better under-standing for the potassium storage in K-deficient layered KxMnO2 (x ≤ 0.23),possessing an important basic scientific significance for the exploitation and application of layered KxMnO2 in PIBs.