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In Situ Electrochemically Transforming VN/V2O3 Heterostructure to Highly Reversible V2NO for Excellent Zinc Ion Storage
Small Structures ( IF 13.9 ) Pub Date : 2023-07-25 , DOI: 10.1002/sstr.202300191 Huibing Lu 1 , Zhengchunyu Zhang 1 , Xuguang An 2 , Jinkui Feng 3 , Shenglin Xiong 1 , Baojuan Xi 1
Small Structures ( IF 13.9 ) Pub Date : 2023-07-25 , DOI: 10.1002/sstr.202300191 Huibing Lu 1 , Zhengchunyu Zhang 1 , Xuguang An 2 , Jinkui Feng 3 , Shenglin Xiong 1 , Baojuan Xi 1
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Achieving aqueous zinc-ion batteries (AZIBs) with high capacity and long lifetime remains challenging because the intense charge repulsion of multivalent ions causes structural instability and sluggish kinetics. The electrochemical activity brought by in situ structure optimization has dramatically improved the electrochemical performance. Hereinto, the nanocomposites consisting of VN/V2O3 heterostructure composited with carbon (VN/V2O3@C) by a self-template strategy are synthesized. The VN/V2O3 heterostructure undergoes an in situ electrochemical activation phase transition to highly reversible V2NO after the first cycle. The interface of V2O3 and VN induces ion displacement polarization under the action of the applied electric field, making it easier for oxygen and nitrogen atoms to dope into the crystal structure of VN and V2O3, contributing to V2NO phase formation. Furthermore, theory calculations demonstrate that V2NO can provide favorable adsorption for reversible Zn2+ storage. The V2NO@C electrode thus delivers high reversible capacities of 490.2 mAh g−1 after 310 cycles at 200 mA g−1 and impressive long-cycle stability over 6000 cycles at 10 A g−1. Herein, it sheds new light on the mechanism of in situ electrochemical phase transition from heterostructures into one phase, which is a great revolution in designing cathode materials for AZIBs.
中文翻译：
原位电化学转化 VN/V2O3 异质结构为高度可逆的 V2NO，实现优异的锌离子存储
实现高容量和长寿命的水性锌离子电池（AZIB）仍然具有挑战性，因为多价离子的强烈电荷排斥会导致结构不稳定和动力学缓慢。原位结构优化带来的电化学活性极大地提高了电化学性能。本文通过自模板策略合成了VN/V 2 O 3异质结构与碳复合的纳米复合材料(VN/V 2 O 3 @C)。VN/V 2 O 3异质结构在第一次循环后经历原位电化学活化相转变为高度可逆的V 2 NO。V 2 O 3和VN的界面在外加电场的作用下引起离子位移极化，使氧和氮原子更容易掺杂到VN和V 2 O 3 的晶体结构中，形成V 2 NO相形成。此外，理论计算表明V 2 NO可以为可逆Zn 2+存储提供有利的吸附。因此， V 2 NO@C电极在200 mA g -1下经过310次循环后可提供490.2 mAh g -1的高可逆容量，并且在10 A g -1下经过6000次循环后具有令人印象深刻的长循环稳定性。在此，它为从异质结构到单相的原位电化学相变机制提供了新的线索，这是AZIBs正极材料设计的一次伟大革命。
更新日期：2023-07-25
中文翻译：
原位电化学转化 VN/V2O3 异质结构为高度可逆的 V2NO，实现优异的锌离子存储
实现高容量和长寿命的水性锌离子电池（AZIB）仍然具有挑战性，因为多价离子的强烈电荷排斥会导致结构不稳定和动力学缓慢。原位结构优化带来的电化学活性极大地提高了电化学性能。本文通过自模板策略合成了VN/V 2 O 3异质结构与碳复合的纳米复合材料(VN/V 2 O 3 @C)。VN/V 2 O 3异质结构在第一次循环后经历原位电化学活化相转变为高度可逆的V 2 NO。V 2 O 3和VN的界面在外加电场的作用下引起离子位移极化，使氧和氮原子更容易掺杂到VN和V 2 O 3 的晶体结构中，形成V 2 NO相形成。此外，理论计算表明V 2 NO可以为可逆Zn 2+存储提供有利的吸附。因此， V 2 NO@C电极在200 mA g -1下经过310次循环后可提供490.2 mAh g -1的高可逆容量，并且在10 A g -1下经过6000次循环后具有令人印象深刻的长循环稳定性。在此，它为从异质结构到单相的原位电化学相变机制提供了新的线索，这是AZIBs正极材料设计的一次伟大革命。
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