固态聚合物-颗粒混合电解质:结构和电化学特性
Nyalaliska W Utomo1, Shifeng Hong2, Ritwick Sinha1
1Robert Frederick Smith School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, NY 14853, USA.
Science advances
|July 5, 2024
概括
这项研究引入了用于电池的新型混合电解质,使用可聚合液体中的氧化颗粒. 这些电解质改善了离子传输,并使稳定,高性能电池循环,特别是在无阳极的设计.
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
- 聚合物化学 聚合物化学
背景情况:
- 固态电解质 (SSEs) 面临的挑战是界面电阻和离子传输.
- 开发先进的电解质对于下一代电池技术至关重要.
研究的目的:
- 研究一种由可聚合的1,3-二氧化 (DOL) 中的氧化 (Li2O) 颗粒组成的新型混合电解质.
- 探索离子电池中这些混合电解质的梯度特性和电化学性能.
主要方法:
- 在电池电池内由易斯酸盐启动的DOL的环开聚合 (ROP).
- 电化学分析基底管NCM811和没有阳极的基底管NCM811电池.
- 电解质性质的光谱表征.
主要成果:
- 混合电解质在粒子和细胞长度尺度上表现出梯度特性.
- 2O颗粒调节ROP,增强离子在颗粒表面附近的传输.
- 重力辅助的沉降会在细胞内产生有益的梯度.
- 涉及Li2O颗粒的可逆回氧反应在无阳极细胞中提高了库伦比效率 (CE) 近100%.
结论:
- 开发的聚合物-无机混合电解质显示出稳定的循环和在苛刻的电池配置中增强的性能.
- 独特的梯度特性和界面行为有助于提高电池周期寿命和效率.
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