Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 7, Issue 38, Pages 22079-22083Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta08418e
Keywords
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Funding
- National Natural Science Foundation of China [21822509, U1810110, 31530009]
- Science and Technology Planning Project of Guangdong Province [2018A050506028]
- Open Funds of the State Key Laboratory of Rare Earth Resource Utilization [RERU2018013]
- Youth Talent Development Program of the State Key Laboratory of Rare Earth Resource Utilization [RERUY2017004]
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To develop aqueous rechargeable Zn-ion batteries (ZIBs) with high capacity and good rate capability, the focus is on cathode improvement. Herein, birnessite delta-MnO2 nanoflorets with La3+ intercalation (LMO) were reported as high-energy and high-rate cathodes for ZIBs. The intercalation of La3+ within the delta-MnO2 nanoflorets was readily achieved by a simple, scalable and effective precipitation process. Benefiting from the larger interlamellar spacing, reduced Zn2+ (de)insertion resistance and increased surface area after La3+ intercalation, the Zn-ion storage capability of the delta-MnO2 nanoflorets was significantly boosted, resulting in high reversible capacity of 278.5 mA h g(-1) at 100 mA g(-1) and superb rate capability of 121.8 mA h g(-1) at 16-fold higher current density (only 3.4 mA h g(-1) for pristine delta-MnO2 nanoflorets) as well as good durability. Moreover, the maximum energy and power densities of the as-obtained Zn//LMO battery reached 375.9 W h kg(-1) and 4.8 kW kg(-1) (based on the cathode mass), respectively. Considering the new design of La3+ intercalation, this study hopes to provide an insightful guide for exploring next-generation Mn-based cathode materials for ZIBs.
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