Zhang Yifu, Xu Lei, Jiang Hanmei, Liu Yanyan, Meng Changgong
State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China.
State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China.
J Colloid Interface Sci. 2021 Dec;603:641-650. doi: 10.1016/j.jcis.2021.06.141. Epub 2021 Jun 27.
The metal ions or conductive macromolecules intercalated hydrated vanadium oxides for aqueous Zn-ion batteries (AZIBs) have received increasing attention in recent years. The strategy for the preparation of the intercalated hydrated vanadium oxides has been achieved great advances but is still a huge challenge. In this contribution, we develop an interface-intercalation method to synthesize the polyaniline-intercalated hydrated vanadium pentoxide (VO·nHO), denoted as PANI-VOH, as the cathode materials for AZIBs. The prepared PANI-VOH exhibits a 3D sponge-like morphology and the surface area of 190 m·g. The interlayer spacing of VOH is expanded to be 14.1 Å, which provides a lot of channels for the rapidly reversible (de)intercalation of Zn ions. The coin-typed Zn//PANI-VOH battery shows the specific discharge capacity of 363 mAh·g at 0.1 A·g and stable cycling performance. Furthermore, the specific capacity remains 131 mAh·g after 2000 cycles at 5 A·g, and the energy density is calculated to be 275 Wh·kg at 78 W·kg on the mass of PANI-VOH. The achieved values are comparable to or even much higher than that of the most state-of-the-art V-based cathode materials for AZIBs. The PANI intercalation can shorten the pathways and facilitate the transports for the migration of ions and electrons. Our finding guides a novel strategy for the intercalation of PANI into the layered materials to adjust their interlayer spacing, which exhibits super ions migration efficiency, as the cathode materials for AZIBs and even other multivalent ions batteries.
近年来，用于水系锌离子电池（AZIBs）的嵌入水合钒氧化物中的金属离子或导电大分子受到了越来越多的关注。制备嵌入水合钒氧化物的策略已取得了很大进展，但仍然是一个巨大的挑战。在本论文中，我们开发了一种界面嵌入方法来合成聚苯胺嵌入的水合五氧化二钒（VO·nHO），记为PANI-VOH，作为AZIBs的阴极材料。所制备的PANI-VOH呈现出三维海绵状形态，比表面积为190 m·g。VOH的层间距扩大到14.1 Å，为锌离子的快速可逆（脱）嵌入提供了许多通道。硬币型Zn//PANI-VOH电池在0.1 A·g时显示出363 mAh·g的比放电容量和稳定的循环性能。此外，在5 A·g下循环2000次后，比容量仍保持在131 mAh·g，基于PANI-VOH质量计算的能量密度在78 W·kg时为275 Wh·kg。所获得的值与用于AZIBs的大多数最先进的钒基阴极材料相当，甚至更高。聚苯胺的嵌入可以缩短离子和电子迁移的路径并促进其传输。我们的发现为将聚苯胺嵌入层状材料以调节其层间距提供了一种新策略，该策略表现出超级离子迁移效率，可作为AZIBs甚至其他多价离子电池的阴极材料。
