Homogenous incorporation of SnO2 nanoparticles in carbon cryogels via the thermal decomposition of stannous sulfate and their enhanced lithium-ion intercalation properties
Homogenous incorporation of SnO2 nanoparticles in carbon cryogels via the thermal decomposition of stannous sulfate and their enhanced lithium-ion intercalation properties
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DOI：
10.1016/j.nanoen.2013.01.009
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发表时间：
2013-09
期刊：
影响因子：
17.6
通讯作者：
M. Zhang;M. Zhang;Yanwei Li;E. Uchaker;S. Candelaria;Laifa Shen;Taihong Wang;G. Cao
中科院分区：
文献类型：
--
作者：
M. Zhang;M. Zhang;Yanwei Li;E. Uchaker;S. Candelaria;Laifa Shen;Taihong Wang;G. Cao
基于硫酸亚锡的热分解，采用煅烧-煅烧法制备了杂质含量较少的碳冻凝胶-氧化锡纳米复合锂离子电池负极材料。结构表征表明，氧化锡纳米粒子，产生于硫酸亚锡的分解，均匀分布在碳晶凝胶的孔内。结果表明，具有大比表面积、大孔隙率和小介孔的碳晶凝胶有利于氧化锡纳米粒子的沉积。结果表明，优化结构的碳晶凝胶-氧化锡纳米复合材料在50次循环后的放电容量为590 mA h/g，远高于碳晶凝胶、纯氧化锡或它们的机械混合物的放电容量。碳晶凝胶-氧化锡纳米复合材料的上级电化学性能是由于其新颖的微观结构和碳晶凝胶与氧化锡之间的协同效应。
An impregnation–calcination method based on the thermal decomposition of stannous sulfate is developed to prepare carbon cryogel-tin oxide nanocomposites with less impurity for anode materials of lithium-ion batteries. Structural characterization reveals that the tin oxide nanoparticles, arising from the decomposition of stannous sulfate, are homogeneously distributed inside the pores of carbon cryogels. The detail results demonstrate that carbon cryogels with large specific surface area, large porosity, and small mesopores are beneficial to the deposition of tin oxide nanoparticles. As a result, carbon cryogel–tin oxide nanocomposites with optimized structures show a discharge capacity of 590 mA h/g after 50 cycles, much higher than that of either carbon cryogels, pure tin oxides or their mechanical mixture. The superior electrochemical properties of carbon cryogel–tin oxide nanocomposites could be attributed to their novel microstructures and the synergistic effects between carbon cryogels and tin oxide.