期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 9, 期 32, 页码 17211-17222出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ta04051k
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资金
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF-2020R1C1C1010611]
- Engineering and Physical Sciences Research Council (EPSRC) United Kingdom Research Innovation (UKRI) Fellowship Novel Manufacturing Approaches to Next Generation Batteries [EP/S001239/1]
- EPSRC [EP/S001239/1] Funding Source: UKRI
A hierarchical beta-MnO2 cathode material with interlaced nanosheets spheres was introduced through efficient defect engineering using fluorine (F)-doping and oxygen vacancies, improving ion insertion, transport kinetics, and electrical conductivity in ZIB. This resulted in a high energy density, superior high-rate performance, and good capacity retention, highlighting the potential of defect-engineered cathode materials for enhanced electrochemical performance in rechargeable aqueous batteries.
The rechargeable aqueous Zn ion battery (ZIB) is a promising candidate for next-generation energy storage technology due to its low cost, low flammability, inherent safety, and high theoretical capacity. Nevertheless, the beta-MnO2 cathode material continues to be limited by inactive ion insertion and transport kinetics due to a relatively narrow tunneling pathway, thus leading to low capacity and rate capabilities. Hence, to achieve a high-performance ZIB, the presence of lattice and defect structures in the beta-MnO2 is required to promote the electrochemical reactions. Herein, for the first time, a beta-MnO2 cathode with a hierarchical structure consisting of spheres of interlaced nanosheets is introduced via efficient defect engineering using fluorine (F)-doping and oxygen vacancies, thus leading to improved ion insertion and transport kinetics along with an enhanced electrical conductivity. The ZIB is shown to exhibit a high energy density (288 W h kg(-1) at a power density of 90 W kg(-1)), a superior high-rate performance (energy density of 158 W h kg(-1) at a power density of 1800 W kg(-1)), and a capacity retention (85% after up to 150 cycles). These results highlight the potential of defect-engineered cathode materials for the enhanced electrochemical performance of rechargeable aqueous batteries.
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