Synergistic Effect of Carbon Encapsulation and Iron Doping Based on Metal–Organic Framework Precursor Enhances NaVPO4F Electrochemical Performance for Sodium-Ion Batteries
Yao Xu, Linwei Yin, Changsheng Yang, Ying Lei, Haiyan Zhang* and Kwunnam Hui,
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引用次数: 0
Abstract
Sodium fluorovanadium phosphate (NaVPO4F) has long been recognized as a promising cathode material for sodium-ion batteries. However, its low conductivity has limited its practical application due to its poor rate performance and long-term stability. The study introduces a method to enhance the electrochemical performance of NaVPO4F by using the metal–organic framework (MOF) as a precursor. This method involves the incorporation of Fe-doping and MOF-derived carbon encapsulation. The synthesized NaV0.94Fe0.06PO4F/MC samples (NVPF-Fe/MC) exhibit extraordinary qualities as cathode material for sodium-ion batteries: a high capability (123.1 mAh/g at 1C), outstanding ultralong cyclability (remaining 83.0% of its capacity even after 1000 cycles at a high cycling rate of 5 C), and significantly improved rate performance. The NVPF-Fe/MC||HC full cell also exhibits excellent reversible capacity (retaining 87.7% sodium storage capacity after 100 cycles). The mesoporous carbon nanonetwork shortens the ion-electron diffusion pathway, promoting ionic-electronic conductivity and reaction kinetics. Additionally, Fe3+ doping increases the cell volume to enlarge the diffusion channel, while activating part of the V5+/V4+ (4.0 V vs Na+/Na) due to the induced effect of Fe3+, thereby improving the specific capacity and cycling stability.
氟钒磷酸钠(NaVPO4F)是一种很有前途的钠离子电池正极材料。但其电导率低,速率性能差,长期稳定性差,限制了其实际应用。介绍了一种利用金属有机骨架(MOF)作为前驱体来提高NaVPO4F电化学性能的方法。这种方法涉及到铁掺杂和mof衍生的碳包封。合成的NaV0.94Fe0.06PO4F/MC样品(NVPF-Fe/MC)作为钠离子电池正极材料表现出非凡的品质:高容量(1C时123.1 mAh/g),出色的超长循环性能(在5℃的高循环率下,即使在1000次循环后仍保持83.0%的容量),以及显著提高的倍率性能。NVPF-Fe/MC||HC全电池也表现出优异的可逆容量(100次循环后仍保持87.7%的钠储存容量)。介孔碳纳米网络缩短了离子-电子扩散途径,促进了离子-电子电导率和反应动力学。此外,Fe3+的掺杂增加了电池体积,扩大了扩散通道,同时由于Fe3+的诱导作用,激活了部分V5+/V4+ (4.0 V vs Na+/Na),从而提高了比容量和循环稳定性。
期刊介绍:
ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.