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- W3135855433 endingPage "2006433" @default.
- W3135855433 startingPage "2006433" @default.
- W3135855433 abstract "In this study, four different MnO2 polymorphs are synthesized with a controlled morphology of hollow porous structures to systematically investigate the influences of polymorphs in conversion-based material. As the structure of these materials transforms into nanosized metal and maintains an extremely low-crystalline phase during cell operation, the effects of polymorphs are overlooked as compared to the case of insertion-based materials. Thus, differences in the ion storage behaviors among various MnO2 polymorphs are not well identified. Herein, the structural changes, charge storage reaction, and electrochemical performance of the different MnO2 polymorphs are investigated in detail. The experimental results demonstrate that the charge storage reactions, as part of which spinel-phased MnO2 formation is observed after lithiation and delithiation instead of recovery of the original phases, are similar for all the samples. However, the electrochemical performance varies depending on the initial crystal structure. Among the four polymorphs, the spinel-type λ-MnO2 delivers the highest reversible capacity of ≈1270 mAh g−1. The structural similarity between the cycled and pristine states of λ-MnO2 induces faster kinetics, resulting in the better electrochemical performance. These findings suggest that polymorphs are another important factor to consider when designing high-performance materials for next-generation rechargeable batteries." @default.
- W3135855433 created "2021-03-15" @default.
- W3135855433 creator A5010131613 @default.
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- W3135855433 creator A5090455719 @default.
- W3135855433 date "2021-03-11" @default.
- W3135855433 modified "2023-10-15" @default.
- W3135855433 title "Polymorphic Effects on Electrochemical Performance of Conversion‐Based MnO <sub>2</sub> Anode Materials for Next‐Generation Li Batteries" @default.
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- W3135855433 doi "https://doi.org/10.1002/smll.202006433" @default.
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- W3135855433 hasPublicationYear "2021" @default.
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