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| CFx-Ru Composite Cathode for Lithium Primary Battery with Significantly Improved Electrochemical Performance |
| Author Name | Affiliation | E-mail | | ZHANG Ling-Xiao | Beijing Key Laboratory for Green Catalysis and Separation, Department of Chemistry and Chemical Engineering, School of Environmental and Energy Engineering, Center of Excellence for Environmental Safety and Biological Effects, Beijing University of Technology, Beijing 100124, China | | | ZHANG Li-Juan | Beijing Key Laboratory for Green Catalysis and Separation, Department of Chemistry and Chemical Engineering, School of Environmental and Energy Engineering, Center of Excellence for Environmental Safety and Biological Effects, Beijing University of Technology, Beijing 100124, China | zhanglj1997@bjut.edu.cn | | XILI De-Ge | Beijing Key Laboratory for Green Catalysis and Separation, Department of Chemistry and Chemical Engineering, School of Environmental and Energy Engineering, Center of Excellence for Environmental Safety and Biological Effects, Beijing University of Technology, Beijing 100124, China | | | LI Fan | Beijing Key Laboratory for Green Catalysis and Separation, Department of Chemistry and Chemical Engineering, School of Environmental and Energy Engineering, Center of Excellence for Environmental Safety and Biological Effects, Beijing University of Technology, Beijing 100124, China | |
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| Abstract: CFx-Ru cathode materials for lithium primary batteries were synthesized by a simple in-situ chemical modification for the first time. Compared with pristine commercial CFx, CFx-Ru exhibited an improved capacity of 605 mAh·g-1 and a maximum power density of 8 727 W·kg-1 with a plateau of 2 V at 5C, which shows a promising application in the market. The structure, chemical environment and morphology were investigated by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy and transmission electron microscopy. It is found that the ratio of F to C (nF/nC) and the peak area ratio of the C-F2 bond to the C-F covalent bond in CFx-Ru were both lowered, which is supposed to come from the reaction of RuO2 with CF2 inert group of CFx materials in situ synthesis. This in-situ chemical reaction consumed inactive CF2, produced conductive elemental ruthenium, and increased specific surface area due to gas phase product evolution. These features contribute to the excellent electrochemical performance of the modified material. The improved conductivity and larger specific surface area were further comfirmed by the results of electrochemical impedance spectroscopy and N2 adorption-desorption measurements. |
| Keywords: lithium primary batteries high rate performance in-situ chemical modification ruthenium CFx |
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| ZHANG Ling-Xiao,ZHANG Li-Juan,XILI De-Ge,LI Fan.CFx-Ru Composite Cathode for Lithium Primary Battery with Significantly Improved Electrochemical Performance[J].Chinese Journal of Inorganic Chemistry,2020,36(1):148-158. |
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