Yao Xu , Meng-Xin Bai , Zheng-Hua He , Jing-Feng Hou , Ling-Bin Kong
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引用次数: 2
摘要
五氧化二钒,作为一种低成本、安全可靠的阴极电极材料。水溶液锌离子电池(AZIBs)在反复插入和脱嵌Zn2+的过程中,其结构容易崩溃,因此提高五氧化二钒的结构稳定性和提高倍率性能一直是一个挑战。本研究通过溶剂热反应制备了类似海胆的钒酸钠材料,制备的样品在V2O5框架中化学包埋Na+的过程中表现出快速的离子传输路径,这是由于纳米线可以提供丰富的活性位点。这为高放大性能铺平了道路。此外,独特的海胆样形态具有较大的比表面积,可以在离子插入过程中不断适应应变,从而获得优异的长周期性能。上述优点赋予了NaVO在0.5 a /g下具有250.5 mA g - 1的高度稳定的放电容量和100 mA h g - 1的长循环容量,在10 a /g下保持超过11,000次循环。值得注意的是,容量保留率高达85.7%。
Solvothermal synthesis of sea urchin-like NaxV2O5 structure for ultra-high stability aqueous zinc ion batteries
Vanadium pentoxide, as a low-cost, safe and reliable cathode electrode material. Its structure is prone to collapse during the process of repeated Zn2+ intercalation and deintercalation of aqueous zinc-ion batteries (AZIBs), so enhancing the structural stability of vanadium pentoxide and improving the rate performance has always been a challenge. In this work, sea urchin-like NaxV2O5 vanadate materials are obtained by solvothermal reaction, and the prepared samples exhibit a fast ion transport path during the process of Na+ chemical embedding in V2O5 framework, which is due to the plentiful active sites that nanowires can provide. This paves the way for high magnification performance. In addition, the unique sea urchin-like morphology with a large specific surface can continuously adapt to strain during ion insertion to obtain excellent long cycle performance. The above merits endow NaVO with a highly stable discharge capacity of 250.5 mA g−1 at 0.5 A/g and a long cycle capacity of 100 mA h g−1 maintains for more than 11,000 cycles at 10 A/g. Remarkably, the capacity retention rate up to 85.7%.
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.