Ignition Inhibition of Dialkyl Carbonate Solvents used in Lithium-Ion Batteries via Fluorination

通过氟化抑制锂离子电池中使用的碳酸二烷基酯溶剂的着火

• 批准号: 535189852
• 负责人: Professor Dr.-Ing. Alexander Heufer
• 金额: --
• 依托单位: Lehrgebiet und Abteilung für Hochtemperatur-Gasdynamik, Stoßwellenlabor (SWL)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/535189852?language=en
• 关键词: Ignition; Inhibition; Dialkyl; Carbonate; Solvents

Lithium-ion batteries play a key role in our daily life and are essential for transforming the mobility sector towards a post-fossil era. The ion transport in such batteries is typically facilitated via electrolytes which require solution in a liquid to maintain charge transfer. In this context, carbonates are widely used solvents for lithium-ion batteries, yet these highly flammable compounds pose a thread during battery operation. Mechanical, electrical, or thermal stress can cause battery fires which are fueled by the carbonate solvents. A promising approach to improve the ignition and fire safety of lithium-ion batteries is the use of fluorinated carbonate solvents. Despite their potential for reducing ignition tendency, the fundamental combustion characteristics of these fluorinated carbonates are not yet thoroughly investigated. In the proposed research, experiments in a shock tube and a rapid compression machine in combination with ab initio calculations will allow developing consistent and validated detailed chemical kinetic models for predicting the combustion behavior of fluorinated dialkyl carbonates. This combustion behavior will be compared to that of the non-fluorinated, i.e. regular, dialkyl carbonate counterparts to gain an in-depth understanding of the effect of fluorination on the combustion chemistry. The proposed theoretical, modeling, and experimental research on regular and fluorinated dimethyl, ethyl methyl, and diethyl carbonate will be the first systematic investigation and will critically add to the solvent design process which is required to prepare current solvent technologies for the increasing demand for safe lithium-ion batteries.

锂离子电池在我们的日常生活中发挥着关键作用，对于将移动领域转变为后化石时代至关重要。这种电池中的离子传输通常通过电解液来促进，电解液需要在液体中溶解才能保持电荷转移。在这种情况下，碳酸盐是锂离子电池广泛使用的溶剂，但这些高度易燃的化合物在电池运行过程中形成了一条线。机械、电气或热应力会导致电池起火，起火的燃料是碳酸盐溶剂。使用氟碳酸酯溶剂是提高锂离子电池点火和防火安全性的一种很有前途的方法。尽管它们具有降低着火倾向的潜力，但这些含氟碳酸盐的基本燃烧特性还没有得到彻底的研究。在拟议的研究中，在激波管和快速压缩机上的实验结合从头计算将允许开发一致的和经过验证的详细的化学动力学模型来预测含氟的二烷基碳酸盐的燃烧行为。这种燃烧行为将与非氟化的，即规则的二烷基碳酸酯对应物进行比较，以深入了解氟化对燃烧化学的影响。拟议的规则和氟化二甲基甲基二乙酸二乙酯的理论、建模和实验研究将是第一次系统的研究，并将关键地增加溶剂设计过程，该过程需要准备当前的溶剂技术，以满足日益增长的安全锂离子电池的需求。