以商业化碳黑科琴黑为碳源,采用球磨和热复合法合成正极S/C复合材料,用X射线衍射、扫描电子显微镜、元素组成分析等分析S/C复合材料的微观结构、组成和形貌,用恒流充放电、循环伏安法、交流阻抗法分析电极材料电化学性能。在0.2 C倍率...以商业化碳黑科琴黑为碳源,采用球磨和热复合法合成正极S/C复合材料,用X射线衍射、扫描电子显微镜、元素组成分析等分析S/C复合材料的微观结构、组成和形貌,用恒流充放电、循环伏安法、交流阻抗法分析电极材料电化学性能。在0.2 C倍率下首次放电比容量为838.4 m Ah/g,最高达930.3 m Ah/g,经过50次循环后可逆容量依然高达835.1 m Ah/g,显示出良好的循环稳定性。展开更多
The novel calcium-silicate-hydrate(C-S-H)/paraffin composite phase change materials were synthesized using a discontinuous two-step nucleation method.Initially,the C-S-H precursor is separated and dried,followed by im...The novel calcium-silicate-hydrate(C-S-H)/paraffin composite phase change materials were synthesized using a discontinuous two-step nucleation method.Initially,the C-S-H precursor is separated and dried,followed by immersion in an aqueous environment to transform it into C-S-H.This two-step nucleation approach results in C-S-H with a specific surface area of 497.2 m^(2)/g,achieved by preventing C-S-H foil overlapping and refining its pore structure.When impregnated with paraffin,the novel C-S-H/paraffin composite exhibits superior thermal properties,such as a higher potential heat value of 148.3 J/g and an encapsulation efficiency of 81.6%,outperforming conventional C-S-H.Moreover,the composite material demonstrates excellent cyclic performance,indicating its potential for building thermal storage compared to other paraffin-based composites.Compared with the conventional method,this simple technology,which only adds conversion and centrifugation steps,does not negatively impact preparation costs,the environment,and resource consumption.This study provides valuable theoretical insights for designing thermal storage concrete materials and advancing building heat management.展开更多
文摘以商业化碳黑科琴黑为碳源,采用球磨和热复合法合成正极S/C复合材料,用X射线衍射、扫描电子显微镜、元素组成分析等分析S/C复合材料的微观结构、组成和形貌,用恒流充放电、循环伏安法、交流阻抗法分析电极材料电化学性能。在0.2 C倍率下首次放电比容量为838.4 m Ah/g,最高达930.3 m Ah/g,经过50次循环后可逆容量依然高达835.1 m Ah/g,显示出良好的循环稳定性。
基金The National Natural Science Foundation of China(No.52122802,52078126)Jiangsu Provincial Department of Science and Technology Innovation Support Program(No.BK20222004,BZ2022036).
文摘The novel calcium-silicate-hydrate(C-S-H)/paraffin composite phase change materials were synthesized using a discontinuous two-step nucleation method.Initially,the C-S-H precursor is separated and dried,followed by immersion in an aqueous environment to transform it into C-S-H.This two-step nucleation approach results in C-S-H with a specific surface area of 497.2 m^(2)/g,achieved by preventing C-S-H foil overlapping and refining its pore structure.When impregnated with paraffin,the novel C-S-H/paraffin composite exhibits superior thermal properties,such as a higher potential heat value of 148.3 J/g and an encapsulation efficiency of 81.6%,outperforming conventional C-S-H.Moreover,the composite material demonstrates excellent cyclic performance,indicating its potential for building thermal storage compared to other paraffin-based composites.Compared with the conventional method,this simple technology,which only adds conversion and centrifugation steps,does not negatively impact preparation costs,the environment,and resource consumption.This study provides valuable theoretical insights for designing thermal storage concrete materials and advancing building heat management.
