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前化SiO_x-Si-C复合阳极的组成和循环性能之间的相互作用,用于硫全细胞

Swamickan Sathya¹, Ramasamy Santhosh Kumar², Sara Garcia-Ballesteros³

¹Electrochemical Power Sources Division, CSIR-Central Electrochemical Research Institute, Karaikudi 630003, India.

Materials (Basel, Switzerland)

|March 13, 2025

概括

-氧化 (SiO_x) 阳极通过缓冲体积变化,为离子电池提供了更好的循环稳定性. 一个SiO_x/Si/C复合电极证明了最佳性能,提高了电池的循环性.

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:

阳极承诺高容量,但在循环过程中遭受~300%的体积膨胀.
-氧化物 (SiO_x) 材料形成Li₂O和LiSiO₄,作为体积变化和稳定的SEI层形成的自然缓冲器.
提高可循环使用性和保持产能是基阳极的关键挑战.

研究的目的:

研究SiO_x/Si/C复合电极,以提高离子电池阳极性能.
为阳极应用确定无形SiO_x,Si和石墨碳的最佳组成.
为了评估硫硬币电池中预化SiO_x-Si-C阳极的循环性能.

主要方法:

制备各种SiO_x/Si/C电极组合.
优化无形SiO_x,Si和石墨碳的比例.
在最佳电极的前化.
2032型Li-S硬币电池的组装和循环性能测试,具有S-C/SiO_x-Si-C配置.

主要成果:

一个SiO_x-Si-C电极具有70:12.5:12.5的比率表现出最佳的放电能力.
SiO_x矩阵有效地适应了体积变化,并促进了稳定的固体电解质介相 (SEI) 层.
预先化电极在Li-S硬币细胞中表现出更好的循环性能.

结论:

基于SiO_x的阳极是一种可行的策略,可以减轻阳极的体积扩张问题.
优化的SiO_x/Si/C复合电极显示了实际电池应用的巨大潜力.
对预化SiO_x-Si-C阳极的进一步研究可能会导致先进的储能解决方案.

关键词:

排放能力的排放能力.硫电池是硫电池的一种.在化前进行化.子氧化物中的子氧化物.固体电解质相间阶段

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