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首页> 外文期刊>Carbon: An International Journal Sponsored by the American Carbon Society >Preparation and lithium-storage performance of carbon/silica composite with a unique porous bicontinuous nanostructure
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Preparation and lithium-storage performance of carbon/silica composite with a unique porous bicontinuous nanostructure

机译：具有独特的多孔双连续纳米结构的碳/二氧化硅复合材料的制备和储锂性能

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摘要

A class of carbon/silica composite with a porous bicontinuous nanostructure is prepared via a simple sol-gel method and then used as anode material for lithium-ion batteries. The reversible specific capacity of the as-prepared composite stays over 560 mAh g~(-1) after 30 cycles, much higher than that of many other carbon materials including commercial graphite and carbon/silica composites. The good electrochemical performance can be ascribed to the following three factors: (i) continuous silica gel framework stores most of lithium ions; (ii) continuous carbon framework not only restrains the volume change during repeated insertion and extraction of lithium ions, but also represents an excellent conductive skeleton throughout the composite; (iii) nanopores among the carbon/silica bicontinuous framework are helpful to the mass transport and can further buffer the volume change of silica.
机译：通过简单的溶胶-凝胶法制备了一类具有多孔双连续纳米结构的碳/二氧化硅复合材料，然后将其用作锂离子电池的负极材料。制备的复合材料的可逆比容量在30个循环后保持在560 mAh g〜（-1）以上，远高于包括商业石墨和碳/二氧化硅复合材料在内的许多其他碳材料。良好的电化学性能可归因于以下三个因素：（i）连续硅胶骨架可存储大部分锂离子; （ii）连续的碳骨架不仅抑制了锂离子重复插入和提取过程中的体积变化，而且在整个复合材料中都表现出出色的导电骨架; （iii）碳/二氧化硅双连续骨架之间的纳米孔有助于质量传递，并可以进一步缓冲二氧化硅的体积变化。

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