MATERIALS AND SUSTAINABLE DEVELOPMENT: ADVANCED MATERIALS FOR CLEAN ENERGY UTILIZATION |
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Preparation and Electrochemical Performance of Humic Acid-based Graphitized Materials |
Dongyong SI,Guangxu HUANG,Chuanxiang ZHANG,Baolin XING,Zehua CHEN,Liwei CHEN,Haoran ZHANG
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College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454003 |
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Abstract The lithium-ion battery anode material have been prepared from humic acid through high-temperature heat treatment. The morphology, microcrystalline structure and electrochemical properties of as-prepared activated material were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and electrochemical testing system. The results indicated that the humic acid-based graphitized materials showed a more regular graphite lamellar structure, and the degree of graphitization of the materials was also getting higher and higher with the increase of graphitization temperature. The humic acid-based graphitized mate-rials all presented good electrochemical performance. The graphitized material with the temperature of 2 800 ℃ had a first discharge specific capacity of 356.7 mAh/g and a charge capacity of 277.6 mAh/g, and the initial coulombic efficiencies was 77.81%. The capacity retention rate after 50 cycles at 1C and 2C rates was as high as 99.4% and 95.9%, respectively. The above results suggest that the humic acid-based graphitized material is an ideal lithium ion battery anode material.
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Published: 10 February 2018
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SEM patterns of Shanxi humic acid graphitized materials(2 000×)
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XRD patterns of Shanxi humic acid graphitized materials
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The charge/discharge curves of the Shanxi humic acid graphitized electrode materials in the first cycles with the current of 0.1C rate
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Sample | 0.5C mAh/g | 1C mAh/g | 2C mAh/g | Capacity retention rate | SX-HA-2200 | 129.1 | 90.6 | 30.4 | 83.0% | SX-HA-2400 | 126.6 | 105.6 | 38.5 | 89.3% | SX-HA-2600 | 216.7 | 138.6 | 37.0 | 90.7% | SX-HA-2800 | 239.4 | 200.6 | 150.7 | 94.2% |
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Discharge specific capacity and capacity retention at different current rates of Shanxi humic acid graphitizing electrode materials
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The cycle performance and rate of the Shanxi humic acid graphitized electrode materials
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The cyclic voltammetry curve of Shanxi humic acid graphitized electrode material
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