在现场构建电极上的固软合固体电解质介面,以实现高性能离子电池
Zhenxiao Li1, Tingjie Hu1, Juan Yang1,2
1School of Metallurgy and Environment, Central South University, Changsha, 410083, China.
Small (Weinheim an der Bergstrasse, Germany)
|October 20, 2023
概括
研究人员开发了一种新的固体电解质接口 (SEI) 膜,用于阳极. 这种稳定的SEI薄膜有效地管理了.
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
- 纳米技术 纳米技术
背景情况:
- 阳极为离子电池提供了高的理论容量,但由于体积膨胀和不稳定的固体电解质接口 (SEI) 而受到影响.
- 这些问题导致库伦比克效率低下和容量迅速衰减,阻碍了阳极的实际应用.
- 现有的SEI层往往缺乏在循环过程中适应体积变化的机械强度和化学稳定性.
研究的目的:
- 开发一种用于阳极的多功能SEI薄膜,以应对体积膨胀并提高电化学性能.
- 通过在纳米粒子 (SiNPs) 上的碳-功能化群体的现场接种来构建一个新的SEI层的形成和特性.
- 证明这种SEI在提高基电极的稳定性和周期寿命方面的有效性.
主要方法:
- 在SiNPs上通过碳-功能组的表面接种在SiNPs上构建具有高LiF含量的多功能SEI膜.
- 机械表征以评估SEI薄膜的特性,重点是刚性-软性合效应.
- 电化学测试,包括循环性能,库伦比效率和修改SEI的Si阳极的容量保留.
主要成果:
- 成功形成了一种刚软合性SEI薄膜,结合了LiF和完整的碳基.
- 该SEI膜有效地适应了SiNPs的体积膨胀,在100个循环后将电极膨胀率降至114.16%,而裸体Si的263.87%相比.
- 在1.2 A g-1.1的200个循环后,获得了89.8%的初始库伦比效率和1477 mAh g-1的可逆容量.
结论:
- 开发的刚软合SEI薄膜为管理阳极体积变化提供了强大而有效的解决方案.
- 这种方法显著提高了基于的离子电池的电化学稳定性和循环寿命.
- 这些发现为在储能设备中实践实施高性能阳极提供了有希望的战略.
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