| Zhengzhou Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences | Host |
| Citation: |
SHI Mingming, XU Aoqin, PENG Chenglong, LI Zhen. Effect of Size Regulation of Natural Molybdenite on Electrochemical Performance for Lithium-ion Batteries[J]. Conservation and Utilization of Mineral Resources, 2021, 41(4): 85-92. doi: 10.13779/j.cnki.issn1001-0076.2021.07.008
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Effect of Size Regulation of Natural Molybdenite on Electrochemical Performance for Lithium-ion Batteries
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Abstract
The size of anode materials has an essential effect on the performance of lithium-ion batteries. The grinding time was designed to prepare different sizes of natural molybdenite, and the relationship between the size and the electrochemical performance of lithium-ion batteries was explored. The average sizes of the samples abraded for 30 (M30), 60 (M60), and 90 min (M90) were 19.45, 13.14, and 11.23 μm, respectively. XRD and SEM show that the smaller the particle size, the smaller the grain size, and the more serious the edge crushing is. Electrochemical performance tests showed that the first cycle capacities of the three groups were 851, 797, and 649 mAh·g-1, respectively, and the capacity retention rates after 100 cycles were 30%, 38%, and 85%, respectively. M90 had the maximum lithium-ion diffusion coefficient of 3.29×10-10, and the pseudocapacitance was the main contribution to the capacity calculated at different CV scanning rates of 0.1~0.8 mV·s-1, which could realize rapid electron and ion shuttle. The smaller the size of natural molybdenite, the smaller the first cycle capacity, but better cycle and rate performance and faster reaction kinetics, and similar to the natural molybdenite layered lithium storage model were proposed to clarify the relationship between the size of natural molybdenite and the performance of the lithium-ion battery.
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References
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SHI Mingming, XU Aoqin, PENG Chenglong, LI Zhen. Effect of Size Regulation of Natural Molybdenite on Electrochemical Performance for Lithium-ion Batteries[J]. Conservation and Utilization of Mineral Resources, 2021, 41(4): 85-92. doi: 10.13779/j.cnki.issn1001-0076.2021.07.008
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Figure 1.
Process flow chart for preparation of molybdenum electrode materials
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Figure 2.
Size distribution of natural molybdenite (a) M30, (b) M60 and (c) M90
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Figure 3.
XRD plots of natural molybdenite with different particle sizes
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Figure 4.
SEM spectra of natural molybdenite at (a-c) M30, (d-f) M60, (g-i) M90, and (j-l) EDX elemental mapping images of molybdenite
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Figure 5.
Charge-discharge curves of natural molybdenite in the first three cycles (a)M30, (b)M60, (c)M90, and (d) discharge performance comparison in the first cycle
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Figure 6.
(a) Cyclic characteristics and (b) magnification curves of natural molybdenite with different particle sizes
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Figure 7.
CV figures of natural molybdenite (a) 30M, (b) 60M and (c)90M
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Figure 8.
(a)Nyqiust diagram and (b) fitting diagram of low frequency region of natural molybdenite with different particle sizes
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Figure 9.
Electrochemical kinetic analysis diagram of M90: (a) CV curve of scanning rate from 0.1 to 0.2 mV s-1; (b) log i vs. log v plots at oxidation and reduction state; (c) Capacitance and diffusion control contribute to the CV curve at 0.2 mV s-1; (d) Bar chart showing the contribution ratio of pseudocapacitive and diffusion-controlled contribution of the natural molybdenite electrode at t at different scan rate.
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Figure 10.
Lithium storage model with the layered structure of natural molybdenite