The use of silicon (Si) in the form of nanoparticles is one of the most promising routes for boosting the capacity of modern Li‐ion batteries. Many parameters influence the performance of Si making the comparison of materials complicated. The present work demonstrates a direct comparison of Si nanoparticles with amorphous and crystalline structures prepared through the same chemistry with the same particle size and morphology. The amorphous Si nanoparticles with an average diameter of 100 nm were synthesized through silane pyrolysis, and their crystalline analogues were obtained through subsequent annealing not altering size or morphology of the nanoparticles. Such direct comparison allows evaluation of the specific impact of crystallinity on the material's performance. From electrochemical analysis of these materials, the electrodes prepared from amorphous nanoparticles were found to exhibit improved cycle life compared to electrodes prepared from crystalline nanoparticles when the delithiation capacity of the anode was limited to 1000 mAh/g_Si.

中文翻译：

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硅纳米粒子的结晶度：直接影响锂离子电池阳极的电化学性能

以纳米颗粒形式使用硅（Si）是提高现代锂离子电池容量的最有希望的途径之一。许多参数影响Si的性能，使材料的比较复杂。本工作展示了通过相同化学性质，相同粒径和形态制备的具有无定形和晶体结构的硅纳米粒子的直接比较。通过硅烷热解合成了平均直径为100 nm的非晶Si纳米粒子，并通过随后的退火而不改变纳米粒子的尺寸或形态获得了其晶体类似物。这种直接比较可以评估结晶度对材料性能的特定影响。通过对这些材料的电化学分析，_硅。