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High Structural Stability and Reaction Mechanism of Porous Carbon Nanobox Encapsulated Monodisperse CoP Nanoparticles for High‐Performance Lithium‐Ion Battery

Von Wiley-VCH zur Verfügung gestellt

Synergy effect: The porous carbon nanobox encapsulated monodisperse CoP (CoP@PCB) was developed via a low-temperature phosphorization strategy. Compared to bare CoP electrodes, CoP@PCB electrodes have demonstrated excellent reversible capacity (820 mAh g−1 after 200 cycles at 0.2 A g−1) and superior rate capability (up to 5 A g−1), all of which are attributed to the design of their hollow carbon nanoboxes.


Abstract

Transition metal phosphides (TMPs) are perplexed by the low electronic/ionic conductivity, volume variations, and unstable reaction interfaces. To tackle these issues, herein, we have proposed a low-temperature phosphorization strategy by reactions between Co-based metal-organic frameworks (MOF) and sodium dihydric hypophosphite to encapsulate monodisperse CoP nanoparticle (∼12 nm) into MOF-derived hollow and porous carbon nanobox (CoP@PCB). Compared to bare CoP, such CoP@PCB electrode has shown remarkable electrochemical performance, which is highly ascribed to its robust structural feature, pre-reserved voids, monodisperse CoP nanoparticles, and stable reaction interfaces, as well as fast reaction kinetics. Moreover, the good electrochemical properties of CoP@PCB//LiFePO4 full cells have demonstrated practical possibility. The formation of Co and Li3P as discharged products has corroborated the redox conversion reaction mechanism, as assessed by in-situ X-ray diffractions. The favorable function of the carbon shell in boosting both electronic conductivity and lowering diffusion energy barriers has been confirmed by theoretical calculations, demonstrating an important synergistic effect.

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