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Construction of CoP/Mn2P Heterojunctions via One-Step Phosphorization Coupled With Hollow Hard Carbon Spheres as Supports: Enabling Ultrastable Long-Cycle Sodium-Ion Anodes Over a Wide Temperature Range
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Abstract
En 中文
Driven by global energy transition and sustainability, sodium-ion batteries (SIBs) have emerged as key alternatives to lithium-ion batteries for low-to-medium energy storage, because of abundant sodium resources and low cost. However, their commercialization is hindered by the lack of anodes with high capacity, fast kinetics, and long-term stability. In this work, a bimetallic phosphide heterojunction hollow carbon sphere composite (DHC-CoP/Mn2P@HG) was designed and synthesized via multidimensional structural and compositional engineering. A one-step phosphorization strategy constructed the CoP/Mn2P heterojunction, whose interfacial electronic coupling alleviates poor conductivity and severe volume expansion compared to single-metal phosphides. Hollow hard carbon spheres (HG) buffer volume variation and enable efficient electron transport, whereas dopamine hydrochloride-derived N-doped carbon enhances active sites and interfacial adhesion to suppress structural degradation. Electrochemical characterizations show that the DHC-CoP/Mn2P@HG anode delivers a reversible capacity of 232 mAh g-1 after 13,000 cycles at 20 A g-1 (capacity retention similar to 95%) and exhibits excellent temperature tolerance (negligible capacity decay after 300 cycles at -30 degrees C or 500 cycles at 50 degrees C). Density functional theory (DFT) calculations reveal interfacial charge rearrangement at the heterojunction, providing theoretical support for performance enhancement. This study establishes a novel paradigm for SIB anodes with wide temperature adaptability and ultralong cycle life, promoting the practical application of SIBs. (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(SIBs)(sic)(sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(DHC-CoP/Mn2P@HG).(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) CoP/Mn2P (sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic); (sic)(sic)(sic)(sic)(sic)(HG)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic),DHC-CoP/Mn2P@HG (sic)(sic)(sic) 20 A g-1(sic)(sic)(sic)(sic)(sic)(sic)(sic) 13,000 (sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic) 232 mAh g-1((sic)(sic)(sic)(sic)(sic)(sic) 95%),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(-30 degrees C(sic)(sic)(sic) 300 (sic),50 degrees C(sic)(sic)(sic) 500 (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)).(sic)(sic)(sic)(sic)(sic)(sic)(sic)(DFT)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)SIBs(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).
Keywords:
bimetallic phosphides
heterojunctions
hollow hard carbon spheres
sodium-ion batteries
wide temperature range
AI Summary
Key information extracted from the uploaded paper, including a brief overview, abstract, background, key highlights, visual analysis, and future outlook.
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