Journal
NANO RESEARCH
Volume 14, Issue 1, Pages 91-99Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-020-3046-8
Keywords
Zn-doped Co3O4; aqueous rechargeable Co/Zn battery; fiber-shaped; high-capacity; high-rate
Categories
Funding
- National Natural Science Foundation of China [51703241]
- Fundamental Research Funds for the Central Universities [020514380183]
- Key Research Program of Frontier Science of Chinese Academy of Sciences [QYZDB-SSW-SLH031]
- Science and Technology Project of Nanchang [2017-SJSYS-008]
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This study successfully utilized metallic Zn-Co3O4 nanowire arrays as the cathode to fabricate an all-solid-state fiber-shaped aqueous rechargeable Co//Zn battery, which exhibits remarkable capacity, rate capability, and energy density.
Neutral aqueous rechargeable Co3O4//Zn batteries with high-output voltage and outstanding cycling stability have yielded new insights into wearable energy-storage devices. To meet the increasing demand for a means of powering wearable and portable devices, the development of a high-performance fiber-shaped Co//Zn battery would be highly desirable. However, the intrinsically poor conductivity of Co(3)O(4)significantly restricts the application of these high-capacity and high-rate aqueous rechargeable battery. Encouragingly, density functional theory (DFT) calculations demonstrate that the substitution of Zn for Co3+ leads to an insulator-metal transition in the Zn-doped Co3O4(Zn-Co3O4). In this study, we used metallic Zn-Co3O4 nanowire arrays (NWAs) as a novel binder-free cathode to successfully fabricate an all-solid-state fiber-shaped aqueous rechargeable (AFAR) Co//Zn battery. The resulting fiber-shaped Co//Zn battery takes advantage of the enhanced conductivity, increased capacity, and improved rate capability of Zn-Co3O4 NWAs to yield a remarkable capacity of 1.25 mAh center dot cm(-2) at a current density of 0.5 mA center dot cm(-2), extraordinary rate capability (60.8% capacity retention at a high current density of 20 mA center dot cm(-2)) and an admirable energy density of 772.6 mWh center dot cm(-3). Thus, the successful construction of Zn-Co3O4 NWAs provides valuable insights into the design of high-capacity and high-rate cathode materials for aqueous rechargeable high-voltage batteries.
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