Organohalide Perovskites are Fast Ionic Conductors

Vicente, Nuria; García-Belmonte, Germà

doi:10.1002/aenm.201700710

Cited by 69 publications

(50 citation statements)

References 26 publications

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“…Accordingly, the processes taking place during lithiation are very complex and some kind of electrode restructuring is occurring. Moreover, by electrochemical impedance spectroscopy the diffusivity coefficient in CH 3 NH 3 PbBr 3 was determined, providing diffusivity values as high as D μ ≈10 −7 cm 2 s −1 . This value highlights the fast ionic conductivity of hybrid perovskite compounds, as recently corroborated for intrinsic defect migration …”

Section: Introductionmentioning

confidence: 56%

“…After discharging to 0.05 V, the cell was charged to an anodic cut‐off potential of 1.80 V. All potential values reported in this work refer to the Li/Li + quasi‐reference couple and all capacity data are normalized to the mass of the CH 3 NH 3 PbBr 3 active material. Further details regarding the structural, morphological, and electrochemical characterization of the active material can be found in our previous works ,…”

Section: Methodsmentioning

confidence: 99%

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Probing the 3‐step Lithium Storage Mechanism in CH₃NH₃PbBr₃ Perovskite Electrode by Operando‐XRD Analysis

et al. 2018

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Organic‐inorganic hybrid materials have gradually become one of the most actively studied research fields due to their fascinating properties. The reaction between lithium and organic‐inorganic halide perovskite has just recently been proposed. However, the exact mechanisms taking place in this electrode material have not been fully elucidated, yet. To shed light on these processes an operando‐X‐ray diffraction study has been performed and is reported herein. According to our results the lithiation of CH3NH3PbBr3 entails three reaction steps, distinguishable during the initial galvanostatic lithiation for different Li‐ion molar content x: (1) the initial Li+ insertion into the perovskite phase in which pure perovskite and lithiated phases coexist (0 0.3, the formation of a Lix:CH3NH3PbBr3 phase with distinctive X‐ray diffraction peaks is clearly detected, which coexists with the pristine material, till abruptly both phases disappear at x∼1 and CH3NH3Br and Pb metal are formed. It is shown that this conversion reaction is an irreversible process. The proposed mechanism for lithium storage gives a complete perspective of the complex structural environment involving the use of perovskite materials as electrodes for Li‐ion batteries.

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Section: Introductionmentioning

confidence: 56%

Section: Methodsmentioning

confidence: 99%

Probing the 3‐step Lithium Storage Mechanism in CH₃NH₃PbBr₃ Perovskite Electrode by Operando‐XRD Analysis

et al. 2018

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“…23,24 These compounds own interesting electronic and photonic properties, and ionic migration allows for a variety of applications in electrochemical devices. The hybrid perovskite CH3NH3PbBr3 has been utilized as active material for the intercalation anode, which behaves as a compact structure in which the dimensionality of Li In this section, a review about the use of the impedance technique for analyzing conversion and alloying anodes is done.…”

Section: 18mentioning

confidence: 99%

New approaches to the lithiation kinetics in reaction-limited battery electrodes through electrochemical impedance spectroscopy

2018

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Electrochemical impedance spectroscopy is a widely employed technique probing kinetic limitations in the charging of battery electrodes. Hindrance mechanisms locate at the interfaces between the active material and the electrolyte, and in the bulk of the reacting compound. Rate-limiting mechanisms are viewed as resistive circuit elements and can be extracted by standard impedance analyzers. Classical impedance models consider charge transport, mainly ion diffusion as slower carrier, as the principal kinetic limitation impeding full electrode charging. This is indeed the case for many technologically relevant battery compounds. In other instances, instead of being diffusion-limited, electrodes may undergo charging limitation caused by the kinetics of the reduction reaction itself. Specific impedance models for reaction-limited mechanisms are summarized here and proved for relevant electrode compounds, in particular for conversion or alloying electrodes in which Li + intake produces a full rearrangement of the lattice structure with significant atomic displacement.

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“…[160] In such a case, electronic and ionic transport is decoupled, because the migration and intercalation of Li + (the slower process)…”

Section: Li-ion Batteriesmentioning

confidence: 99%

“…As the perovskite lithiation progresses, specific capacity values as high as 400 mA h g −1 were reached. [160,161] 3D MaPbBr3 electrodes exhibit a highly reversible lithium uptake and release without severe distortion of the perovskite lattice (topotactic intercalation). It was proposed that the lithiation proceeds in a fashion that multiple Li + are intercalated into the same unit cell.…”

Section: Li-ion Batteriesmentioning

confidence: 99%

Characterization of optically active perovskite electrodes

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Organohalide Perovskites are Fast Ionic Conductors

Cited by 69 publications

References 26 publications

Probing the 3‐step Lithium Storage Mechanism in CH₃NH₃PbBr₃ Perovskite Electrode by Operando‐XRD Analysis

Probing the 3‐step Lithium Storage Mechanism in CH₃NH₃PbBr₃ Perovskite Electrode by Operando‐XRD Analysis

New approaches to the lithiation kinetics in reaction-limited battery electrodes through electrochemical impedance spectroscopy

Characterization of optically active perovskite electrodes

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Organohalide Perovskites are Fast Ionic Conductors

Cited by 69 publications

References 26 publications

Probing the 3‐step Lithium Storage Mechanism in CH3NH3PbBr3 Perovskite Electrode by Operando‐XRD Analysis

Probing the 3‐step Lithium Storage Mechanism in CH3NH3PbBr3 Perovskite Electrode by Operando‐XRD Analysis

New approaches to the lithiation kinetics in reaction-limited battery electrodes through electrochemical impedance spectroscopy

Characterization of optically active perovskite electrodes

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Probing the 3‐step Lithium Storage Mechanism in CH₃NH₃PbBr₃ Perovskite Electrode by Operando‐XRD Analysis

Probing the 3‐step Lithium Storage Mechanism in CH₃NH₃PbBr₃ Perovskite Electrode by Operando‐XRD Analysis