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首页> 外文期刊>Advanced energy materials >Mechanistic Insight into the Electrochemical Performance of Zn/VO_2 Batteries with an Aqueous ZnSO_4 Electrolyte
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Mechanistic Insight into the Electrochemical Performance of Zn/VO_2 Batteries with an Aqueous ZnSO_4 Electrolyte

机译：用ZnSO_4电解质水溶液对Zn / VO_2电池的电化学性能的机理研究

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Rechargeable aqueous zinc-ion batteries (ZIBs) are promising for cheap stationary energy storage. Challenges for Zn-ion insertion hosts are the large structural changes of the host structure upon Zn-ion insertion and the divalent Zn-ion transport, challenging cycle life and power density respectively. Here a new mechanism is demonstrated for the VO2 cathode toward proton insertion accompanied by Zn-ion storage through the reversible deposition of Zn-4(OH)(6)SO4 center dot 5H(2)O on the cathode surface, supported by operando X-ray diffraction, X-ray photoelectron spectroscopy, neutron activation analysis, and density functional theory simulations. This leads to an initial discharge capacity of 272 mAh g(-1) at a current density of 3.0 A g(-1), of which 75.5% is maintained after 945 cycles. It is proposed that the competition between proton and Zn-ion insertion in the VO2 host is determined by the solvation energy of the salt anion and proton insertion energetics, where proton insertion has the advantage of minimal structural distortion leading to a long cycle life. As the discharge kinetics are capacitive for the first half of the process and diffusion limited for the second half, the VO2 cathode takes the middle road possessing both fast kinetics and high practical capacities revealing a reaction mechanism that provides new perspective for the development of aqueous ZIBs.
机译：可充电水性锌离子电池（ZIB）有望用于廉价的固定式能量存储。 Zn离子插入主体的挑战是，在Zn离子插入和二价Zn离子迁移后，主体结构的巨大结构变化，分别挑战了循环寿命和功率密度。这里展示了一种新的机理，表明VO2阴极通过在操作表面X的支持下，通过在阴极表面上可逆沉积Zn-4（OH）（6）SO4中心点5H（2）O的可逆沉积，使质子插入并伴随着锌离子存储。射线衍射，X射线光电子能谱，中子活化分析和密度泛函理论模拟。这导致在电流密度为3.0 A g（-1）时的初始放电容量为272 mAh g（-1），其中在945个循环后保持了75.5％。有人提出，VO2主体中质子与Zn离子插入之间的竞争取决于盐阴离子和质子插入能量的溶剂化能，其中质子插入的优点是结构畸变最小，从而延长了循环寿命。由于放电动力学在工艺的前半部分是电容性的，而扩散对后半部分是有限的，VO2阴极处于中间路线，同时具有快速的动力学和高的实际容量，揭示了反应机理，这为水性ZIBs的开发提供了新的视角。

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