Journal
JOURNAL OF CENTRAL SOUTH UNIVERSITY
Volume 26, Issue 6, Pages 1510-1520Publisher
JOURNAL OF CENTRAL SOUTH UNIV
DOI: 10.1007/s11771-019-4107-6
Keywords
manganese-based compounds; hydrothermal method; sodium-ion batteries; composite materials
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Funding
- National Natural Science Foundation of China [51672234]
- Program for Innovative Research Cultivation Team in University, Ministry of Education, China [1337304]
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Na0.44MnO2 nanorods have been prepared by a hydrothermal method. The experimental parameters have been systematically investigated and optimized. The results show that Na0.44MnO2 nanorods obtained via the hydrothermal treatment at 200 degrees C for 16 h show the best electrochemical properties, which deliver the high initial discharge capacity of 110.7 mA center dot h/g at 50 mA/g in potential window 2.0-4.0 V. To further improve their electrochemical properties, a ball milling process with graphene has been carried out to obtain Na0.44MnO2/graphene composite. The initial discharge capacity of Na0.44MnO2/graphene composite is 106.9 mA center dot h/g at a current density of 50 mA/g. After 100 cycles, the residual discharge capacity is 91.8 mA center dot h/g and the capacity retention rate is 85.9%, which is much higher than that of pristine Na0.44MnO2 nanorods (74.7%) at the same condition. What is more, when the current density reaches 500 and 1000 mA/g, the corresponding discharge capacities of Na0.44MnO2/graphene composite are about 89 and 78 mA center dot h/g, respectively, indicating outstanding rate capability.
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