解读超稳定的高压离子电池的净化添加剂化学
Sen Jiang1,2, Ruhong Li1,2, Long Chen1,2
1State Key Laboratory of Silicon and Advanced Semiconductor Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China.
Advanced materials (Deerfield Beach, Fla.)
|February 26, 2025
概括
研究人员确定了高压离子电池中化 (HF) 清除添加剂的关键设计原则. 甲基乙基西拉 (HMDS) 有效地消除了HF,显著改善了电池的寿命和性能.
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:
- 化 (HF) 导致高压离子电池的显著降解,影响电极材料和接相.
- 开发有效的高频清除添加剂至关重要,但由于对高频清除反应的理解不足以及缺乏设计原则而受到限制.
研究的目的:
- 通过使用能量分解分析分析24种添加剂来阐明高频扫除机制.
- 为离子电池中有效的高频消除添加剂建立一个强大的设计原则.
主要方法:
- 使用能量分解分析 (EDA) 对24种潜在添加剂进行计算分析.
- 确定HF添加剂反应的关键因素,特别是轨道贡献率 (OCR).
- 实验验证使用甲基基拉 (HMDS) 作为石墨/LiNi0.8Co0.1Mn0.1O2袋细胞中的添加剂.
主要成果:
- 轨道贡献率 (OCR) 被确定为HF添加反应的关键决定因素,H+ (80%) 和F- (53%) 的特定最佳值.
- 肝甲基二甲基沙拉 (HMDS) 被确定为一种优质的添加剂,对H+和F-离子都表现出最佳的OCR.
- 1%重量的HMDS添加显著抑制了HF,抑制了阴极-阳极交叉声,并限制了电极/相间降解,导致在2528个周期内保持80%的容量.
结论:
- 已经建立了基于OCR的高频消除添加剂的一般设计原则.
- HMDS是一种高效的添加剂,可提高高压离子电池的稳定性和循环寿命.
- 这些发现为开发下一代高性能电池的先进电解质添加剂提供了宝贵的见解.
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