SiO中的氧含量x影响化学预化动力学,胀和分区
Zehua Lin1, Zhigang Zak Fang1, Pei Sun1
1Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112-0114, United States.
ACS omega
|March 9, 2026
概括
子氧化 (SiOx) 阳极中的氧含量会影响化学前化 (CPL). 较高的氧气减少了CPL期间的胀,但增加了不可逆转的损失,为更好的离子电池性能提供了设计规则.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 子氧化 (SiOx) 是离子 (Li-ion) 电池的一个有前途的阳极材料.
- 在SiOx阳极中的初始低库伦比效率 (ICE) 主要是由固体电解质介相 (SEI) 形成和酸生成引起的.
- 化学预化 (CPL) 是一种提高离子阳极 ICE 的策略.
研究的目的:
- 研究SiOx中的氧含量对化学前化 (CPL) 过程的影响.
- 了解氧气如何影响CPL动力学,电极膨胀和分区.
- 建立优化SiOx预化设计规则,以提高离子电池性能.
主要方法:
- 使用Li-biphenyl/2-methyltetrahydrofuran用于CPL.使用不同氧含量 (3.2-17.0重量%) 的SiOx进行了检查.
- 研究了CPL动力学,电极胀和分区.
- 在CPL后,在全细胞 (LCO/SiOx) 中评估的性能.
主要成果:
- SiOx中的氧减轻了CPL期间的体积膨胀,提高了每单位ICE改善的胀缓解.
- 适度的氧含量加速了早期的CPL动力学,而较低的氧含量有利于晚期的储存.
- 氧含量增加导致不可逆 (SEI/酸盐) 的比重更高,以牺牲可逆Li-Si合金.
结论:
- SiOx中的氧含量在控制CPL方面发挥着关键作用,影响动力学,胀和分布.
- 通过作为一次性补充剂,CPL提高了全细胞中的ICE和容量.
- 该研究通过定义最佳氧含量和剂量窗口,为SiOx预化提供了实际的设计指南.
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