Graphene-like Vanadium Oxygen Hydrate (VOH) Nanosheets Intercalated and Exfoliated by Polyaniline (PANI) for Aqueous Zinc-Ion Batteries (ZIBs)
Graphene-like Vanadium Oxygen Hydrate (VOH) Nanosheets Intercalated and Exfoliated by Polyaniline (PANI) for Aqueous Zinc-Ion Batteries (ZIBs)
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DOI：
10.1021/acsami.0c10183
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发表时间：
2020-07-15
影响因子：
9.5
通讯作者：
Li, Xing
中科院分区：
文献类型：
--
作者：
Wang, Mingshan;Zhang, Jun;Li, Xing
采用一种新的方法来提高锌离子电池（ZIB）正极用氢氧化钒（VOH，V2 O 5中心点nH（2）O）的电化学动力学和稳定性。该方法是基于导电聚苯胺（PANI）插层剥离的VOH，通过预插层的苯胺单体和其原位聚合内的氧化物夹层。所得的石墨烯样PANI-VOH纳米片具有对总电荷存储容量的大大增强的反应控制贡献，导致更多的材料经历可逆的V5+到V3+氧化还原反应。PANI-VOH电极在IA下获得了令人印象深刻的323 mAh g（-1）的容量，并且在800次循环后以80%的容量保持率获得了最先进的循环稳定性。由于容易的氧化还原动力学，PANI-VOH ZIB获得了独特的有前途的比能量比功率组合：在252 W kg（-1）时达到216 Wh kg（-1）的能量，而在3900 W kg（-1）时达到150 Wh kg（-1）。电化学阻抗谱（EIS）和恒电流间歇滴定技术（GITT）分析表明，与VOH基线相比，PANI-VOH纳米片同时降低了电荷转移电阻和提高了Zn 2+的扩散系数（提高了10-100倍）。采用聚苯胺的插层-剥离相结合的策略，可以提供一个广泛适用的方法，以提高在一系列的氧化物基储能材料的性能。
A new approach is employed to boost the electrochemical kinetics and stability of vanadium oxygen hydrate (VOH, V2O5 center dot nH(2)O) employed for aqueous zincion battery (ZIB) cathodes. The methodology is based on electrically conductive polyaniline (PANI) intercalated-exfoliated VOH, achieved by preintercalation of an aniline monomer and its in situ polymerization within the oxide interlayers. The resulting graphene-like PANI-VOH nanosheets possess a greatly boosted reaction-controlled contribution to the total charge storage capacity, resulting in more material undergoing the reversible V5+ to V3+ redox reaction. The PANI-VOH electrode obtains an impressive capacity of 323 mAh g(-1) at 1 A and state-of-the-art cycling stability at 80% capacity retention after 800 cycles. Because of the facile redox kinetics, the PANI-VOH ZIB obtains uniquely promising specific energy-specific power combinations: an energy of 216 Wh kg(-1) is achieved at 252 W kg(-1), while 150 Wh kg(-1) is achieved at 3900 W kg(-1). Electrochemical impedance spectroscopy (EIS) and galvanostatic intermittent titration technique (GITT) analyses indicate that with PANI-VOH nanosheets, there is a simultaneous decrease in the charge transfer resistance and a boost in the diffusion coefficient of Zn2+ (by a factor of 10-100) vs the VOH baseline. The strategy of employing PANI for combined intercalation-exfoliation may provide a broadly applicable approach for improving the performance in a range of oxide-based energy storage materials.