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<p>Ethanol chemical delithiation is an effective method for producing layered amorphous silicon (a-Si) powders. Among various a-Si materials, a-Si (Li<sub>12</sub>Si<sub>7</sub>-74) and a-Si (Li<sub>13</sub>Si<sub>4</sub>-74), etched from particles (Li<sub>12</sub>Si<sub>7</sub> and Li<sub>13</sub>Si<sub>4</sub>) with a size of 74&#xa0;μm, demonstrate superior electrochemical performance. When used as anodes for lithium-ion batteries, the layered a-Si (Li<sub>12</sub>Si<sub>7</sub>-74) and a-Si (Li<sub>13</sub>Si<sub>4</sub>-74) exhibit high initial coulombic efficiencies (ICE) of 66% and 72%, respectively, and a fast Li-ion diffusion rate of approximately 10<sup>−14</sup> cm<sup>2</sup> s<sup>−1</sup>, which is better than that of a-Si (Li<sub>7</sub>Si<sub>3</sub>-74) and a-Si (Li<sub>22</sub>Si<sub>5</sub>-74). After 100 cycles at a current density of 0.1 A g<sup>−1</sup>, the layered a-Si (Li<sub>12</sub>Si<sub>7</sub>-74) and a-Si (Li<sub>13</sub>Si<sub>4</sub>-74) deliver discharge capacities of 520.96 mAh g<sup>−1</sup> and 465.98 mAh g<sup>−1</sup>, respectively. The particle size of the LiSi<sub>x</sub> precursor significantly influences etching results. A-Si (Li<sub>13</sub>Si<sub>4</sub>-74) has a better ICE compared to a-Si (Li<sub>13</sub>Si<sub>4</sub>-150) and a-Si (Li<sub>13</sub>Si<sub>4</sub>-50), yet its cycling performance is slightly inferior to that of a-Si (Li<sub>13</sub>Si<sub>4</sub>-50). Meanwhile, a-Si (Li<sub>12</sub>Si<sub>7</sub>-50) has a higher ICE than a-Si (Li<sub>12</sub>Si<sub>7</sub>-150) and a-Si (Li<sub>12</sub>Si<sub>7</sub>-74), but its cycling performance is worse than that of a-Si (Li<sub>12</sub>Si<sub>7</sub>-74). The satisfactory electrochemical performance of a-Si can be attributed to its layered morphology, highlighting its potential for commercial applications.</p>

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Layered amorphous silicon derived from chemical delithiation of LiSix: a promising anode material for lithium-ion batteries

  • 期刊论文

  • 发表日期：

    2025年4月30日

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  • Yifan Lv,
  • Jing Fang,
  • Xianglong Han,
  • Peng Qiu,
  • Tianyu Zhu,
  • Shuyu Yao

摘要

Ethanol chemical delithiation is an effective method for producing layered amorphous silicon (a-Si) powders. Among various a-Si materials, a-Si (Li12Si7-74) and a-Si (Li13Si4-74), etched from particles (Li12Si7 and Li13Si4) with a size of 74 μm, demonstrate superior electrochemical performance. When used as anodes for lithium-ion batteries, the layered a-Si (Li12Si7-74) and a-Si (Li13Si4-74) exhibit high initial coulombic efficiencies (ICE) of 66% and 72%, respectively, and a fast Li-ion diffusion rate of approximately 10−14 cm2 s−1, which is better than that of a-Si (Li7Si3-74) and a-Si (Li22Si5-74). After 100 cycles at a current density of 0.1 A g−1, the layered a-Si (Li12Si7-74) and a-Si (Li13Si4-74) deliver discharge capacities of 520.96 mAh g−1 and 465.98 mAh g−1, respectively. The particle size of the LiSix precursor significantly influences etching results. A-Si (Li13Si4-74) has a better ICE compared to a-Si (Li13Si4-150) and a-Si (Li13Si4-50), yet its cycling performance is slightly inferior to that of a-Si (Li13Si4-50). Meanwhile, a-Si (Li12Si7-50) has a higher ICE than a-Si (Li12Si7-150) and a-Si (Li12Si7-74), but its cycling performance is worse than that of a-Si (Li12Si7-74). The satisfactory electrochemical performance of a-Si can be attributed to its layered morphology, highlighting its potential for commercial applications.