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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电解质水溶液探测Zn / VO_2电池的电化学性能的机械洞察

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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（ZIBS）是廉价固定储能的很有希望。 Zn离子插入宿主的挑战是Zn离子插入时宿主结构的大结构变化，分别攻击循环寿命和功率密度。这里，通过在阴极表面上的Zn-4（OH）（6）SO4中心点5h（2）O的可逆沉积，对所述质子插入的VO2阴极朝向质子插入朝向质子插入的新机构进行了新的机理。 -Ray衍射，X射线光电子体光谱，中子激活分析和密度泛函理论模拟。这导致初始放电容量为272mAhg（-1）的电流密度为3.0μg（-1），其中在945次循环后保持75.5％。建议通过盐阴离子和质子插入能量的溶剂化能量确定质子和Zn离子插入之间的竞争，质子插入具有最小结构变形的优点，这导致长循环寿命的结构变形。由于放电动力学对下半部分的前半部分具有电容性，因此，VO2阴极采用中间道路，具有快速动力学和高实际容量，揭示了为水性ZIB的开发提供了新的视角的反应机制。

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