Islam Saiful, Alfaruqi Muhammad Hilmy, Putro Dimas Yunianto, Park Sohyun, Kim Seokhun, Lee Seulgi, Ahmed Mohammad Shamsuddin, Mathew Vinod, Sun Yang-Kook, Hwang Jang-Yeon, Kim Jaekook
Department of Materials Science and Engineering Chonnam National University Gwangju 500-757 South Korea.
Department of Metallurgical Engineering Sumbawa University of Technology Olat Maras Sumbawa West Nusa Tenggara 84371 Indonesia.
Adv Sci (Weinh). 2021 Jan 4;8(4):2002636. doi: 10.1002/advs.202002636. eCollection 2021 Feb.
Manganese (Mn)-based cathode materials have garnered huge research interest for rechargeable aqueous zinc-ion batteries (AZIBs) due to the abundance and low cost of manganese and the plentiful advantages of manganese oxides including their different structures, wide range of phases, and various stoichiometries. A novel in situ generated Mn-deficient ZnMnO@C (Mn-d-ZMO@C) nanoarchitecture cathode material from self-assembly of ZnO-MnO@C for rechargeable AZIBs is reported. Analytical techniques confirm the porous and crystalline structure of ZnO-MnO@C and the in situ growth of Mn deficient ZnMnO@C. The Zn/Mn-d-ZMO@C cell displays a promising capacity of 194 mAh g at a current density of 100 mA g with 84% of capacity retained after 2000 cycles (at 3000 mA g rate). The improved performance of this cathode originates from in situ orientation, porosity, and carbon coating. Additionally, first-principles calculations confirm the high electronic conductivity of Mn-d-ZMO@C cathode. Importantly, a good capacity retention (86%) is obtained with a year-old cell (after 150 cycles) at 100 mA g current density. This study, therefore, indicates that the in situ grown Mn-d-ZMO@C nanoarchitecture cathode is a promising material to prepare a durable AZIB.
基于锰（Mn）的阴极材料因其丰富且低成本的锰以及锰氧化物的诸多优势，包括不同的结构、广泛的相和多样的化学计量比，在可充电水系锌离子电池（AZIBs）领域引发了巨大的研究兴趣。本文报道了一种通过ZnO-MnO@C自组装原位生成的缺锰ZnMnO@C（Mn-d-ZMO@C）纳米结构阴极材料，用于可充电AZIBs。分析技术证实了ZnO-MnO@C的多孔晶体结构以及缺锰ZnMnO@C的原位生长。Zn/Mn-d-ZMO@C电池在100 mA g的电流密度下展现出194 mAh g的可观容量，在2000次循环后（3000 mA g速率）仍保留84%的容量。该阴极性能的提升源于原位取向、孔隙率和碳涂层。此外，第一性原理计算证实了Mn-d-ZMO@C阴极具有高电子导电性。重要的是，在100 mA g电流密度下，使用一年的电池（150次循环后）仍能保持86%的良好容量保持率。因此，本研究表明原位生长的Mn-d-ZMO@C纳米结构阴极是制备耐用AZIB的一种有前景的材料。
