在石墨阳极中用于存化学的以太溶剂的拓结构设计
Chengyu Chen1, Ling Che1, Chao Shen1
1State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, China.
Angewandte Chemie (International ed. in English)
|November 28, 2025
概括
为离子电池 (LIB) 设计以太基电解质需要仔细调整溶剂结构. 优化的以太溶剂具有特定的电子特性和体积,可以防止有害的协同插曲,提高电池性能和稳定性.
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:
- 基于以太的电解质为下一代离子电池 (LIB) 提供了优势,因为其具有有利的物理性质.
- 然而,强烈的溶解会导致离子 (Li+) 协同插曲,导致石墨剥落并限制电池寿命.
研究的目的:
- 研究以太溶剂结构,电子性质和石墨中的Li+储存行为之间的关系.
- 开发设计稳定的以太基电解质与石墨阳极兼容的策略.
主要方法:
- 以太溶剂的拓结构工程.
- 分析电子效应 (ESPmax,ESPmin) 和溶剂分子体积.
- 溶剂性质与Li+协同插曲倾向和容量衰减的相关性.
主要成果:
- 增加的电解质稳定性 ( ESPmin - ESPmax) 和降低的 Li+ - 溶剂复合体体积增强了协同插曲.
- 最佳的以太溶剂具有丰富的基结构 (─C2H4O─) 和较短的终端链 (─C2H4).
- 电容衰减归因于连续固体电解质相间断 (SEI) 破裂和重构在共间断过程中.
结论:
- 溶剂的协同电子和体积效应对石墨中的Li+储存进行了批判性调节.
- 设计具有特定结构特征的以太电解质可以减轻石墨剥落并改善LIB性能.
- 这项研究为开发具有更高安全性和寿命的高性能LIB提供了洞察力.
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