以五水四氯化锡为锡源,以间苯二酚和甲醛为碳源,采用简单的水热-碳热还原法对其进行原位合成,通过水解-聚合-原位包覆复合,再经高温碳化后成功制备含有介孔结构的Sn@C复合微球材料。结果表明,该Sn@C复合微球材料直径约为1.5μm,分布在...以五水四氯化锡为锡源,以间苯二酚和甲醛为碳源,采用简单的水热-碳热还原法对其进行原位合成,通过水解-聚合-原位包覆复合,再经高温碳化后成功制备含有介孔结构的Sn@C复合微球材料。结果表明,该Sn@C复合微球材料直径约为1.5μm,分布在碳基体上的Sn颗粒最小约3nm,最大可达20nm;其比表面积为401m2g^(-1),最可几孔径为3.8nm;其首次放电比容量为1237m Ah g^(-1),循环30次后,比容量为470m Ah g^(-1),经过50m A g^(-1)、100m A g^(-1)、200m A g^(-1)、1000m A g^(-1)大电流密度下各循环10次后,放电比容量仍有255m Ah g^(-1),再次返回到50m A g^(-1)时又增至431m Ah g^(-1)。与以二氧化锡为锡源进行简单混合再碳热还原的锡碳复合材料相比,该Sn@C复合微球材料不仅表现出较高的放电比容量,同时也具有较好的循环稳定性能。展开更多
Alloy anodes were studied for pursuing Sn-based microcomposite synthesis, assembly and performance for lithium ion batteries. The self-assembled Sn-Co-C composites with nano-scaled microstructures were prepared via so...Alloy anodes were studied for pursuing Sn-based microcomposite synthesis, assembly and performance for lithium ion batteries. The self-assembled Sn-Co-C composites with nano-scaled microstructures were prepared via solution method and carbothermal technology. The morphology and physical structure were investigated with scanning electron microscope (SEM) and X-ray diffraction (XRD). The as-prepared materials were assembled to half cell coin for the purpose of discussing the galvanostatic cycling, cyclic voltammetry and rate-capability performance. Results reveal that nanoscaled CoSn 2 alloys covered with Sn and C layer by layer are wrapped by cross-linked porous carbon network to form spherical microstructure. This distinguishing feature of Sn-Co-C composites provides a possible solution to the problems of Sn particle aggregation and poor electron transport, and has strong effect on improving electrochemical performance.展开更多
As an anode material in lithium ion battery,the Sn-Co/C composite electrode materials have been successfully synthesized by hydrothermal and sol-gel methods,respectively.The resultant composites were mainly composed o...As an anode material in lithium ion battery,the Sn-Co/C composite electrode materials have been successfully synthesized by hydrothermal and sol-gel methods,respectively.The resultant composites were mainly composed of Sn-based oxides,nanometer Sn-Co alloy and carbon.Carbon and Co,acting as buffer materials,can accommodate to the large volume change of active Sn during the discharge-charge process,thus improving the cycling stability.Although charge/discharge curves revealed the excellent cycle performance for samples synthesized by both methods,composites obtained by the sol-gel showed a better dispersion effect of nanoparticles on the carbon matrix and possessed much more improved stable capacity with*624.9 mAh g-1over 100 cycles and that by hydrothermal method only exhibited*299.3 mAh g-1.Therefore,the Sn-Co/C composites obtained by sol-gel synthesis method could be a perfect candidate for anode material of Li-ion storage battery.展开更多
以纳米二氧化锡、硝酸钴、脲、葡萄糖和十二烷基硫酸钠为原料,通过水热-碳热还原原位制备锂离子电池Sn-Co-C复合负极材料。通过XRD、SEM、EDS和TEM分析表明,原位生成的Sn-Co合金颗粒分布于纳米或微米尺度的碳球和碳纳米棒内部以及微孔...以纳米二氧化锡、硝酸钴、脲、葡萄糖和十二烷基硫酸钠为原料,通过水热-碳热还原原位制备锂离子电池Sn-Co-C复合负极材料。通过XRD、SEM、EDS和TEM分析表明,原位生成的Sn-Co合金颗粒分布于纳米或微米尺度的碳球和碳纳米棒内部以及微孔碳基体之中。电化学测试表明,在50 m A·g-1电流密度下,Sn-Co-C复合负极材料首次充放电比容量分别为602.9 m Ah·g-1和867.1 m Ah·g-1,循环100次后其充放电比容量仍分别保持在350.4 m Ah·g-1和356.6 m Ah·g-1,平均每次放电容量衰减率仅为5.1%。优异的电化学性能主要归因于Sn-Co合金颗粒处于纳米或微米尺度的碳球和碳纳米棒内部以及微孔碳基体之中可以改善其导电性,并可以缓解锂电池充放电过程中产生的体积变化所导致的活性物质脱落,提高循环性能和寿命。展开更多
以金属锡粉(Sn)、金属钴粉(Co)和乙炔黑为主要原料,综合利用固相烧结和高能球磨的方法制备出Sn-Co-C复合负极材料,采用XRD、SEM、EDS和恒电流充放电等技术对材料进行了表征和电性能测试.实验结果表明:高能球磨处理后,Sn-Co-C复合材料颗...以金属锡粉(Sn)、金属钴粉(Co)和乙炔黑为主要原料,综合利用固相烧结和高能球磨的方法制备出Sn-Co-C复合负极材料,采用XRD、SEM、EDS和恒电流充放电等技术对材料进行了表征和电性能测试.实验结果表明:高能球磨处理后,Sn-Co-C复合材料颗粒尺寸减小,首次放电容量显著提升,为476.8 m Ah/g;经过30次循环后可逆容量仍保持在394.4 m Ah/g.展开更多
文摘以五水四氯化锡为锡源,以间苯二酚和甲醛为碳源,采用简单的水热-碳热还原法对其进行原位合成,通过水解-聚合-原位包覆复合,再经高温碳化后成功制备含有介孔结构的Sn@C复合微球材料。结果表明,该Sn@C复合微球材料直径约为1.5μm,分布在碳基体上的Sn颗粒最小约3nm,最大可达20nm;其比表面积为401m2g^(-1),最可几孔径为3.8nm;其首次放电比容量为1237m Ah g^(-1),循环30次后,比容量为470m Ah g^(-1),经过50m A g^(-1)、100m A g^(-1)、200m A g^(-1)、1000m A g^(-1)大电流密度下各循环10次后,放电比容量仍有255m Ah g^(-1),再次返回到50m A g^(-1)时又增至431m Ah g^(-1)。与以二氧化锡为锡源进行简单混合再碳热还原的锡碳复合材料相比,该Sn@C复合微球材料不仅表现出较高的放电比容量,同时也具有较好的循环稳定性能。
基金Projects(51074185, 51274240) supported by the National Natural Science Foundation of ChinaProject supported by the Fundamental Research Funds for the Central Universities
文摘Alloy anodes were studied for pursuing Sn-based microcomposite synthesis, assembly and performance for lithium ion batteries. The self-assembled Sn-Co-C composites with nano-scaled microstructures were prepared via solution method and carbothermal technology. The morphology and physical structure were investigated with scanning electron microscope (SEM) and X-ray diffraction (XRD). The as-prepared materials were assembled to half cell coin for the purpose of discussing the galvanostatic cycling, cyclic voltammetry and rate-capability performance. Results reveal that nanoscaled CoSn 2 alloys covered with Sn and C layer by layer are wrapped by cross-linked porous carbon network to form spherical microstructure. This distinguishing feature of Sn-Co-C composites provides a possible solution to the problems of Sn particle aggregation and poor electron transport, and has strong effect on improving electrochemical performance.
基金financially supported by the National Natural Science Foundation of China (51201066,51171065)Natural Science Foundation of Guangdong Province (S2012020010937,10351063101000001)+1 种基金Foundation for Distinguished Young Talents in Higher Education of Guangdong (2012LYM_0048)the Scientific Research Foundation of Graduate School of South China Normal University (2013kyjj038)
文摘As an anode material in lithium ion battery,the Sn-Co/C composite electrode materials have been successfully synthesized by hydrothermal and sol-gel methods,respectively.The resultant composites were mainly composed of Sn-based oxides,nanometer Sn-Co alloy and carbon.Carbon and Co,acting as buffer materials,can accommodate to the large volume change of active Sn during the discharge-charge process,thus improving the cycling stability.Although charge/discharge curves revealed the excellent cycle performance for samples synthesized by both methods,composites obtained by the sol-gel showed a better dispersion effect of nanoparticles on the carbon matrix and possessed much more improved stable capacity with*624.9 mAh g-1over 100 cycles and that by hydrothermal method only exhibited*299.3 mAh g-1.Therefore,the Sn-Co/C composites obtained by sol-gel synthesis method could be a perfect candidate for anode material of Li-ion storage battery.
文摘以纳米二氧化锡、硝酸钴、脲、葡萄糖和十二烷基硫酸钠为原料,通过水热-碳热还原原位制备锂离子电池Sn-Co-C复合负极材料。通过XRD、SEM、EDS和TEM分析表明,原位生成的Sn-Co合金颗粒分布于纳米或微米尺度的碳球和碳纳米棒内部以及微孔碳基体之中。电化学测试表明,在50 m A·g-1电流密度下,Sn-Co-C复合负极材料首次充放电比容量分别为602.9 m Ah·g-1和867.1 m Ah·g-1,循环100次后其充放电比容量仍分别保持在350.4 m Ah·g-1和356.6 m Ah·g-1,平均每次放电容量衰减率仅为5.1%。优异的电化学性能主要归因于Sn-Co合金颗粒处于纳米或微米尺度的碳球和碳纳米棒内部以及微孔碳基体之中可以改善其导电性,并可以缓解锂电池充放电过程中产生的体积变化所导致的活性物质脱落,提高循环性能和寿命。
文摘以金属锡粉(Sn)、金属钴粉(Co)和乙炔黑为主要原料,综合利用固相烧结和高能球磨的方法制备出Sn-Co-C复合负极材料,采用XRD、SEM、EDS和恒电流充放电等技术对材料进行了表征和电性能测试.实验结果表明:高能球磨处理后,Sn-Co-C复合材料颗粒尺寸减小,首次放电容量显著提升,为476.8 m Ah/g;经过30次循环后可逆容量仍保持在394.4 m Ah/g.
