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通过操作式中子反射计量量化动态和依赖添加剂的接口演变

Kang Wu^1,2, Xiaozhi Zhan^3,4, Peilin Ran²

¹College of Chemical Engineering and Materials, Shandong University of Aeronautics, Binzhou, Shandong 256600, China.

|January 23, 2026

概括

了解固体电解质间相 (SEI) 动态是电池性能的关键. 这项研究使用操作中子反射测量来揭示乙烯碳酸盐和乙烯烯碳酸盐添加剂如何创造不同的SEI结构,改善电池的稳定性和寿命.

科学领域:

电池技术电池技术
材料科学材料科学材料科学
电化学电化学电化学

背景情况:

固体电解质间相 (SEI) 对电池性能至关重要.
用电解质添加剂设计SEI是一个有前途的战略.
在循环过程中,SEI层的动态演变还不太清楚.

研究的目的:

在电池循环过程中量化解决SEI的结构动态.
调查乙烯碳酸盐 (FEC) 和乙烯碳酸盐 (VC) 添加剂对SEI形成的影响.
建立一个可转移的操作中子反射计 (NR) 框架,用于分析添加效应.

主要方法:

使用操作中子反射计 (NR) 来实时监测电池循环期间的SEI结构变化.
使用已知分解机制的模型添加剂 (FEC和VC).
开发了一个强大的NR框架,用于对增材系统的机械洞察.

主要成果:

乙烯碳酸盐 (FEC) 形成了一个薄薄的,有机丰富的SEI (LiF主导),增强机械完整性和循环稳定性.
乙烯碳酸 (VC) 形成一个灵活的,有机主导的SEI,减轻压力诱导的微裂纹.
观察到对比的SEI架构,证明了FEC和VC的不同角色.

结论:

操作NR为SEI进化提供了原子解析的见解,SEI进化受到电解质添加剂的影响.
像FEC和VC这样的特定添加剂导致具有量身定制属性的独特SEI结构.
这些发现为改进高能量密度电池的先进电解质添加剂提供了设计原则.

关键词:

离子电池是一种离子电池.骑自行车的稳定性骑自行车的稳定性电解质添加剂的电解质添加剂接口动力学接口动力学运行中子反射计的操作.固体电解质相间阶段

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