Co-doped porous lamellar structure V2O5 cathode material for high-performance lithium-ion batteries

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry Pub Date : 2025-06-06 DOI:10.1016/j.jelechem.2025.119268

Jiawei Ke, Qiang Liu, Ruiqi Geng, Minghang Cui, Yiming Zhang

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引用次数: 0

Abstract

V₂O₅ cathode materials suffer from sluggish Li⁺ diffusion kinetics and insufficient structural stability. In the present study, lamellar structure Co-doped V₂O₅ was synthesized by hydrothermal method to enhance its ion transport rate and cycling stability. X-ray diffraction analysis showed that Co ions successfully entered the lattice of V₂O₅, leading to lattice expansion. Analysis of the N₂ adsorption/desorption isotherms revealed that the doping of moderate amount of Co favored the increase of specific surface area of V₂O₅. The doping of Co also induced the formation of oxygen vacancies, which would provide more active sites for Li⁺ intercalation/extraction reactions. The cycling and rate performances of the V₂O₅ samples were significantly enhanced at 1.25 % Co doping (denoted as CoVO-1) compared to the undoped V₂O₅ samples. A high reversible specific capacity of 270.9 mAh·g⁻¹ was provided in a voltage window of 2.0–4.0 V at a current density of 300 mA·g⁻¹, and the capacity retention was still 81.4 % after 100 cycles. When the current density was increased to 1500 mA·g⁻¹, the discharge specific reversible specific capacity was still 113.3 mAh·g⁻¹. The improved electrochemical performances of CoVO-1 are mainly attributed to the lattice expansion after doping, the presence of oxygen vacancies leading to the increase of Li⁺ diffusion coefficients, meanwhile, the porous layered structure formed has better structural stability.

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高性能锂离子电池用共掺杂多孔片层结构V2O5正极材料

V2O5正极材料Li+扩散动力学缓慢，结构稳定性不足。本研究采用水热法合成了层状结构的共掺杂V2O5，以提高其离子传输速率和循环稳定性。x射线衍射分析表明，Co离子成功进入V2O5晶格，导致晶格膨胀。N2吸附/解吸等温线分析表明，适量Co的掺杂有利于V2O5比表面积的增加。Co的掺杂也诱导了氧空位的形成，这将为Li+的插入/萃取反应提供更多的活性位点。与未掺杂的V2O5样品相比，掺杂1.25% Co（记为CoVO-1）的V2O5样品的循环性能和速率性能显著提高。在2.0 ~ 4.0 V电压窗下，电流密度为300 mA·g−1，可获得270.9 mAh·g−1的高可逆比容量，循环100次后容量保持率仍为81.4%。当电流密度增加到1500 mA·g−1时，放电比可逆比容量仍为113.3 mAh·g−1。CoVO-1电化学性能的提高主要是由于掺杂后晶格膨胀，氧空位的存在导致Li+扩散系数的增加，同时形成的多孔层状结构具有更好的结构稳定性。

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来源期刊

Journal of Electroanalytical Chemistry 化学-电化学

CiteScore

7.80

自引率

6.70%

发文量

912

审稿时长

2.4 months

期刊介绍： The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.