自终止的,异质的固体电解质介相能够在石墨阳极中实现可逆的乙烯共接
Dawei Xia1, Heonjae Jeong2,3,4, Dewen Hou5,6
1Department of Chemistry, Virginia Tech, Blacksburg, VA 24061.
概括
研究人员使用以太溶剂和盐开发了离子电池的新型电解质,在石墨阳极中实现了高效率和稳定性. 这一突破使得可逆的溶剂共,克服先前的先进电池应用的局限性.
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
- 电池技术 电池技术
背景情况:
- 乙溶剂适用于Na-ion和K-ion电池,但历史上在离子电池中会导致石墨剥落.
- 开发稳定的离子电池电解质对于高性能储能至关重要.
研究的目的:
- 为了在石墨中实现可逆的溶剂协同干扰,使用离子电池的以太基电解质.
- 为了克服石墨脱皮和与以太电解质相关的细胞衰竭的历史挑战.
主要方法:
- 一种新型电解质的设计和配方:1M LiBF4 在1,2-dimethoxyethane (G1) 中.
- 用开发的电解质对天然石墨阳极进行电化学测试.
- 使用各种技术,包括同步子分析,对固体电解质介相 (SEI) 的表征.
- 使用ab initio分子动力学 (AIMD) 模拟的计算建模.
主要成果:
- 设计的电解质 (1M LiBF4 in G1) 使得天然石墨可以达到~91%的初始库伦比克效率和400个循环后>88%的容量保留.
- 在石墨边缘平面上形成了一个自我终结的,粒状的,化伪SEI,减轻了剥皮.
- AIMD模拟揭示了伪SEI的分子起源,操作同步仪分析证实了可逆石墨相变.
结论:
- 证明了极端条件电池在石墨中共化学的可行性.
- 使用以太电解质在石墨中进行可逆的Li-溶剂协同干扰的既定策略.
- 提供了理解和控制各种电池系统中相间形成的基础.
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