Improving the Rate Capability of Unburned Carbon from Oil-Fired Fly Ash as an Anode Material in High-Power Lithium Ion Batteries

Yu Shiang Wu; Tzuo Shing Yeh; Yuan Haun Lee

doi:10.4028/www.scientific.net/AMR.287-290.1304

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The Electrochemical Characterization of Electrochemically Synthesized MnO₂-Based Mixed Oxides for Supercapacitor Applications
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Study on Synthesis and Electrochemical Property of LiMnPO₄ by Microwave Method
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Improving the Rate Capability of Unburned Carbon from Oil-Fired Fly Ash as an Anode Material in High-Power Lithium Ion Batteries
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Influence of Sintering Atmosphere on the Physical and Electrochemical of LiFePO₄/C
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Research on the Electrical Electrochemical Properties of the LiFe_0.98Mn_0.02(PO₄)_1-0.02/3Cl_0.02/C Cathode Materials
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Influence of Carbon Sources on the Electrochemical Performance of LiFePO₄/C Composite Cathode Material
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Solvothermal Synthesis of Pyrite (FeS₂)
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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 287-290Improving the Rate Capability of Unburned Carbon...

Improving the Rate Capability of Unburned Carbon from Oil-Fired Fly Ash as an Anode Material in High-Power Lithium Ion Batteries

Abstract:

Unburned carbon is an industrial waste product of oil-fired fly ash. Recycled ground unburned carbon with an average particle size of 5 μm after heat treatment at 2500°C displayed an first coulombic efficiency of approximately 89.8% at a charge and discharge rate of 0.1 C. The discharging capacity of this type of carbon was 293.7 mAhg^-1, and its capacity retention was approximately 94.7% after 50 cycles. However, the first coulombic efficiency of ground unburned carbon receiving nitric acid treatment after heat treatment increased to 91.1%, its discharging capacity increased to 318.6 mAhg^-1, and its capacity retention increased to 98.5% after 50 cycles. Rate capability tests show that the unburned carbon after heat treatment exhibited a higher capacity in the lower C-rate region (0.2~3 C) at a 0.2 C rate charge and variable C-rates discharge. However, unburned carbon with nitric acid treatment is a suitable material for the higher C-rate region (5~10 C). Unburned carbon after heat treatment exhibited a higher capacity in the lower C-rate region (0.2~0.5 C) at the same C-rate charge and discharge.