Electrolytic extraction-radiometry and microradioautography techniques were used to study the distribution of nodulizing element Ce and anti-nodulizing element S in phases of high purity Fe-C-Si alloy.The results show...Electrolytic extraction-radiometry and microradioautography techniques were used to study the distribution of nodulizing element Ce and anti-nodulizing element S in phases of high purity Fe-C-Si alloy.The results show that,besides forming inclusions,most of Ce atoms concentrate in graphite firstly.As the Ce content increases,the concentration of Ce in graphite tends to saturate,relatively large amount of Ce dissolves in the alloy.Usually,the sulphur also concentrates in graphite.However,it may exist in the form of FeS at the eutectic colony boundaries,if the concentration of S is at a quite high level.Very little amount of S dissolves in the alloy.The morphology of graphite depends upon the degree of saturation of Ce.It appears as nodular when Ce was saturated and,as vermicular while it was semi-saturated.展开更多
本文通过简单的溶胶-凝胶法以聚环三磷腈-4,4’-磺酰基二苯酚聚合物(PZS)为碳源通过在硅纳米颗粒表面包覆碳层,成功构筑了核壳结构的Si@C复合材料.通过对不同厚度碳层包覆的Si@CPZS的储锂性能进行研究,发现当硅表面PZS衍生碳厚度为10 n...本文通过简单的溶胶-凝胶法以聚环三磷腈-4,4’-磺酰基二苯酚聚合物(PZS)为碳源通过在硅纳米颗粒表面包覆碳层,成功构筑了核壳结构的Si@C复合材料.通过对不同厚度碳层包覆的Si@CPZS的储锂性能进行研究,发现当硅表面PZS衍生碳厚度为10 nm时具有最佳的储锂性能,且经过长达290圈的循环后容量仍然保持在940 m Ah·g-1,并且利用X射线衍射图谱、热重、比表面孔径测定仪及透射电镜等分析手段对样品进行了结构和组分分析.本文进一步将Si@CPZS复合材料作为石墨的添加剂,结果表明30%的Si@CPZS复合材料可将石墨负极的容量提升至700 m Ah·g-1.展开更多
文摘Electrolytic extraction-radiometry and microradioautography techniques were used to study the distribution of nodulizing element Ce and anti-nodulizing element S in phases of high purity Fe-C-Si alloy.The results show that,besides forming inclusions,most of Ce atoms concentrate in graphite firstly.As the Ce content increases,the concentration of Ce in graphite tends to saturate,relatively large amount of Ce dissolves in the alloy.Usually,the sulphur also concentrates in graphite.However,it may exist in the form of FeS at the eutectic colony boundaries,if the concentration of S is at a quite high level.Very little amount of S dissolves in the alloy.The morphology of graphite depends upon the degree of saturation of Ce.It appears as nodular when Ce was saturated and,as vermicular while it was semi-saturated.
文摘本文通过简单的溶胶-凝胶法以聚环三磷腈-4,4’-磺酰基二苯酚聚合物(PZS)为碳源通过在硅纳米颗粒表面包覆碳层,成功构筑了核壳结构的Si@C复合材料.通过对不同厚度碳层包覆的Si@CPZS的储锂性能进行研究,发现当硅表面PZS衍生碳厚度为10 nm时具有最佳的储锂性能,且经过长达290圈的循环后容量仍然保持在940 m Ah·g-1,并且利用X射线衍射图谱、热重、比表面孔径测定仪及透射电镜等分析手段对样品进行了结构和组分分析.本文进一步将Si@CPZS复合材料作为石墨的添加剂,结果表明30%的Si@CPZS复合材料可将石墨负极的容量提升至700 m Ah·g-1.
