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Cation and anion (de)intercalation into MXene/Perovskite oxides for high-rate intercalation pseudocapacitance
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DOI：10.1016/j.ensm.2022.05.012.png)
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Abstract
En 中文
Intercalation pseudocapacitance is the next hope for electrochemical energy storage devices to offer high energy density without sacrificing power density. Under intercalation pseudocapacitance, ions (e.g. Li+ into T-Nb2O5, but not limited to cation intercalation only) intercalate into the host materials without phase conversions and no limitations from solid-state diffusion, unlike batteries. Here, a concept of both cations and anions (de)intercalation into the hybrid electrode comprising nanocomposite (MLMO) of MXene (Ti3C2Tx) and perovskite oxides (LaMnO3-delta LMO) are demonstrated. Independently, multilayered MXene and oxygen deficient LMO show cation and anion-based intercalation pseudocapacitance, respectively. During analyzing the electrochemical process through ex situ XPS, it is observed that not only K+ ions but OH ions also (via formation of O-2) (de)intercalate into MLMO and contribute to the total charge storage. Accordingly, MLMO exhibits high capacitance retention (70.82%) even at a high current density of 30 A g 1 (313.6 F g(-1)). Next, a fast-kinetics dual-ion intercalated pseudocapacitive symmetric device with 1.6 V is fabricated which shows a high energy density of 34.1 Wh kg(-1) and astonishing power density of 14.51 kW kg(-1). This study sheds light on new dual-ion intercalation chemistry and sets a concrete path for the establishment of high energy storage devices with fast-kinetics.
Keywords:
Cation-anion intercalation
Pseudocapacitance
Dual-ion intercalation chemistry
Perovskite oxide
MXene
Self-assembly
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20.2
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5.6K
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6.3W
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