传统的锂硫电池涂覆正极由于导电剂、粘结剂的加入而导致实际能量密度降低。将椴木经去木质素直接碳化制备的自支撑碳基体材料具有大比表面积和独特的分级多孔结构,将其与单质硫复合制备了用作锂硫电池正极的自支撑椴木基碳/硫复合材料。通过扫描电子显微镜、X射线衍射仪、比表面积及孔径分析仪对复合材料的形貌特征、微观结构及孔结构参数进行表征和测试,并研究了其电化学性能。结果表明:在0.1C条件下,去木质素的自支撑椴木基碳/硫复合材料CDBWD/S首次放电比容量为961.4mAh/g,经过100次循环后可逆容量还能达到658.7mAh/g,容量保持率为68.5%。
The actual energy density of the coated cathodes in traditional lithium-sulfur batteries decreases due to the addition of conductive agents and binders.The self-supporting carbon-based material prepared by direct carbonization of basswood after delignification had a large specific surface area and a unique hierarchical porous structure.It was compounded with elemental sulfur to prepare a self-supporting basswood-based carbon/sulfur composite material for use as the cathode of lithium-sulfur batteries.The morphological features,microstructure and pore structure parameters of the composite materials were characterized and tested by scanning electron microscope,X-ray diffractometer,specific surface area and pore size analyzer,and their electrochemical performance was studied.The results showed that under 0.1C conditions,the initial discharge specific capacity of the delignified self-supporting basswood-based carbon/sulfur composite material CDBWD/S was 961.4mAh/g.After 100 cycles,the reversible capacity could still reach 658.7mAh/g,and the capacity retention rate was 68.5%.
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基金资助
国家自然科学基金面上项目(52571179);陕西省自然科学基金(2024GX-YBXM-336);陕西省榆林市科技局产学研联合项目(2024-CXY-168)
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