Wang Shuting, Yuan Guanghui, Yang Jiangpeng, Bai Jintao, Wang Gang, Yan Junfeng
State Key Laboratory of Photon-Technology in Western China Energy, Institute of Photonics & Photon-Technology, Northwest University, Xi'an, 710127, P. R. China.
Shaanxi Joint Lab of Graphene (NWU), Xi'an, 710127, P. R. China.
ChemSusChem. 2022 Sep 7;15(17):e202200786. doi: 10.1002/cssc.202200786. Epub 2022 Jul 20.
High-voltage manganese-based materials are considered as promising cathode materials for aqueous zinc-ion batteries (AZIBs). Herein, oxygen vacancy-rich K Mn O sheets were anchored uniformly onto honeycomb-like interconnected carbon nanoflakes (CNF@K Mn O ) for AZIB cathode applications. In the composite, the CNFs provided excellent intergranular electron transport capability, while the oxygen vacancies enhanced the electron transport efficiency inside crystals, and the embedded K ions expanded the interlayer spacing and stabilized the layered crystal structure. A reversible specific capacity of 241 mAh g could be maintained by the composite at 0.5 A g for 400 cycles. A combination of ex-situ analytical methods and density functional theory calculations was carried out to elucidate the electrochemical mechanism of reversible zinc storage. In addition, flexible quasi-solid-state batteries of Zn//CNF@K Mn O were constructed by substituting the traditional aqueous electrolyte for a quasi-solid-state gel electrolyte, which worked efficiently and exhibited high bending durability.
高压锰基材料被认为是水系锌离子电池（AZIBs）颇具前景的阴极材料。在此，富含氧空位的KMnO薄片被均匀地锚定在蜂窝状相互连接的碳纳米片（CNF@KMnO）上，用于AZIB阴极应用。在该复合材料中，碳纳米片提供了优异的晶间电子传输能力，而氧空位提高了晶体内部的电子传输效率，嵌入的K离子扩大了层间距并稳定了层状晶体结构。该复合材料在0.5 A g下循环400次时可保持241 mAh g的可逆比容量。采用非原位分析方法和密度泛函理论计算相结合的方式来阐明可逆锌存储的电化学机制。此外，通过用准固态凝胶电解质替代传统的水系电解质，构建了Zn//CNF@KMnO柔性准固态电池，该电池工作高效且具有高弯曲耐久性。
