Mallick Sourav, Choutipalli Venkata Surya Kumar, Bag Saheb, Subramanian Venkatesan, Raj C Retna
Functional Materials and Electrochemistry Lab, Department of Chemistry Indian Institute of Technology Kharagpur, Kharagpur 721302, India.
Centre for High Computing, CSIR-Central Leather Research Institute, Adyar, Chennai 600020, India.
ACS Appl Mater Interfaces. 2022 Aug 24;14(33):37577-37586. doi: 10.1021/acsami.2c04596. Epub 2022 Aug 9.
The rational defect engineering of Mn-based spinel cathode materials by metal-ion doping and vacancy creation fosters reversible intercalation/deintercalation of charge carriers and boosts the charge storage performance of an aqueous rechargeable zinc-ion battery (ZIB). Herein, we demonstrate the Zn ion storage performance of a defect-engineered ternary spinel cathode based on Zn, Ni, and Mn. The defect engineering of ZnMnO is achieved by Ni doping and creating a cation (Mn and Zn) deficiency. The engineered cathode material has cubic spinel structure in contrast to the defect-free ZnMnO. The DFT studies show that the defect engineering modifies the electronic structure and improves the electronic conductivity. An aqueous rechargeable ZIB is fabricated by using the spinel cathode, and its performance is evaluated in terms of charge-discharge cycling stability, specific capacity, and so on. The ternary spinel-based ZIB has a very long charge-discharge cycling stability with a specific capacity as high as 265 mAh g (at 100 mA g). A 2-fold enhancement in the specific capacity is observed after 5000 cycles. Ni doping affords ultralong cycling stability. The self-discharge studies for a year show that the device retains 63% of the initial performance.
通过金属离子掺杂和空位生成对锰基尖晶石阴极材料进行合理的缺陷工程，可促进电荷载流子的可逆嵌入/脱嵌，并提高水系可充电锌离子电池（ZIB）的电荷存储性能。在此，我们展示了一种基于锌、镍和锰的缺陷工程化三元尖晶石阴极的锌离子存储性能。ZnMnO的缺陷工程是通过镍掺杂和制造阳离子（锰和锌）缺陷来实现的。与无缺陷的ZnMnO相比，工程化阴极材料具有立方尖晶石结构。密度泛函理论研究表明，缺陷工程改变了电子结构并提高了电子导电性。使用该尖晶石阴极制备了一种水系可充电锌离子电池，并从充放电循环稳定性、比容量等方面对其性能进行了评估。基于三元尖晶石的锌离子电池具有非常长的充放电循环稳定性，比容量高达265 mAh g（在100 mA g下）。在5000次循环后，比容量提高了两倍。镍掺杂提供了超长的循环稳定性。长达一年的自放电研究表明，该器件保留了63%的初始性能。
