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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Heading towards novel superior silicon-based lithium-ion batteries: ultrasmall nanoclusters top-down dispersed over synthetic graphite flakes as binary hybrid anodes
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Heading towards novel superior silicon-based lithium-ion batteries: ultrasmall nanoclusters top-down dispersed over synthetic graphite flakes as binary hybrid anodes

机译：迈向新型高级硅基锂离子电池：超小纳米簇自上而下分散在合成石墨薄片上，作为二元混合阳极

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摘要

A prominent anodic material of silicon ultranano-particles (SiUPs, size < 10 nm) using recycled Si wafer fractures as raw materials and further improvement called top-down dispersion for high-capacitive Li-ion batteries has been addressed originally in this work. Economic benefits and outstanding electrochemical properties, including shorter Li-ion diffusive paths and low-strained effects as a result of the unique ultra-nanometric structure, enable such SiUPs to possess superior advantages for scalable manufacturing procedures as compared to other nanometric Si powders and become the priority of starting materials for Si-based anodes potentially. Meanwhile, an advanced top-down dispersive process has been optimized systematically to prevent severe particle aggregation to ameliorate the electrochemical performance of SiUP electrodes. In addition to avoiding pre-aggregation, this top-down dispersion brings in adequate buffer spaces, constructed by dispersive media (graphite flakes) and well-dispersive ultrasmall SiUP nanoclusters (size < 100 nm), alleviating drastic volume variation and local stress during cycling. These improved SiUP electrodes maintained 1200 mA h g(-1) specific capacity over 300 cycles at a high current density of 0.8 A g(-1), coupled with ca. 98.5% reversibility. On the basis of these advantages, including low cost, facile manufacture and high performance, this original method provides a pathway to achieve commercial high-capacitive Si-C composite anodes for Li-ion batteries.
机译：这项工作最初解决了一种重要的硅超纳米粒子（SiUPs，尺寸<10 nm）的阳极材料，该材料使用回收的硅片断裂作为原材料，并进一步改进了所谓的自上而下分散的高电容锂离子电池。经济上的优势和出色的电化学性能，包括独特的超纳米结构带来的较短的锂离子扩散路径和低应变效应，使得此类SiUP与其他纳米Si粉末相比，在可扩展的制造过程中拥有优越的优势，并成为潜在的优先选择硅基阳极的原材料。同时，已经对先进的自上而下的分散工艺进行了系统优化，以防止严重的颗粒聚集，从而改善SiUP电极的电化学性能。除了避免预先聚集外，这种由上而下的分散体还提供了足够的缓冲空间，该空间由分散介质（石墨薄片）和分散良好的超小SiUP纳米簇（尺寸<100 nm）构成，从而减轻了循环过程中的剧烈体积变化和局部应力。这些经过改进的SiUP电极在300个循环中以0.8 A g（-1）的高电流密度保持了1200 mA h g（-1）的比容量，并结合了ca。 98.5％的可逆性。基于这些优点，包括低成本，易于制造和高性能，此原始方法提供了一种途径，可实现用于锂离子电池的商用高容量Si-C复合阳极。

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