Abstract

This article presents a β-SiC nanopowder synthesis process based on the combustion of a Na₂CO₃–kSi solid system (k indicates the moles of Si) in an Ar atmosphere. The authors of this study monitored the combustion parameters (temperature and wave velocity), reaction phases, and morphological changes as the Si/Na₂CO₃ molar ratio was increased. The combustion reaction produced temperatures of 1235–1550°C and resulted in the formation of either carbon nanosheets (k = 1) or SiC nanopowder (k = 2–5) and sodium metasilicate (Na₂SiO₃) as by-product. The SiC nanopowder was tested for its suitability as an anode material for high-performance rechargeable Li-ion batteries. As a result, good battery performance was obtained, with 407 mAh g^–1 at the 5^th cycle and 400 mAh g^–1 at the 60^th cycle, at a capacity retention of approximately 98%.

中文翻译：

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Na 2 CO 3 -Si混合气燃烧合成C和SiC纳米粒子的表征和电化学性能

摘要

本文介绍了一种基于Na ₂ CO ₃ - k Si固体系统（k表示Si的摩尔数）在Ar气氛中燃烧的β-SiC纳米粉的合成方法。这项研究的作者监测了燃烧参数（温度和波速），反应阶段以及随着Si / Na ₂ CO ₃摩尔比的增加而发生的形态变化。燃烧反应产生的温度为1235–1550°C，并导致形成碳纳米片（k = 1）或SiC纳米粉（k = 2–5）和偏硅酸钠（Na ₂ SiO ₃）作为副产品。测试了SiC纳米粉作为高性能可充电锂离子电池负极材料的适用性。结果，获得了良好的电池性能，第5^个循环为407 mAh g ^–1，^第60^个循环为400 mAh g ^–1，容量保持率约为98％。