Secure electrolytes for lithium-ion-batteries

这项题为锂离子电池安全电解液的建议的主要目标是开发新的锂离子电池电解液，显著降低目前商业混合物中的易燃性。在第一个资助期，已经开发了三种不同的基础电解液，它们的闪点与热稳定导电盐相结合，并首次在电池单元中集成了释放二氧化碳的阻燃剂。尽管在电池中添加了新的电化学钝化材料，但与没有任何阻燃剂存在的商业参考电解液相比，电池的电化学性能保持不变。在此基础上，本方案计划了两个主要的研究方向：第一，将结果从目前使用的硬币单元扩展到小尺寸和大尺寸的袋式单元，研究与应用相关的单元尺寸的升级以及所有性能和安全问题的适当可伸缩性的相关研究问题。其次，阻燃剂应集成到电极层中，使电池内的阻燃剂含量更大，并简化未来的加工。需要研究的是，这种集成对电化学性能和预期的安全增加有何影响。在这两种情况下，全面的化学分析控制，特别是对热运输过程中释放的气态分解化合物的控制，将有助于了解所用阻燃剂的分解机理和效果。

The main objective of this proposal entitled Secure electrolytes for lithium-ion-batteries is the development of new electrolytes for lithium-ion-batteries with a significant reduction of the inflammability given in present commercial mixtures. In the first funding period three different base electrolytes with significant enhanced flash points in combination with thermal stable conduct-ing salts and for the first time integration of CO2 releasing flame-retardants in the battery cell had been developed. Despite the addition of new electrochemical passive materials in the cell the elec-trochemical performance have been retained in comparison to commercial reference electrolytes without any presence of flame-retardants. Based on that in this proposal two main research direc-tions are planned: First, the results shall be expanded from the up to now used coin cells to small and large sized pouch-bag cells investigating the upscaling to application relevant cell sizes and the related research questions of suitable scalability of all performance and safety issues. Second, the flame-retardants shall be integrated into the electrode layers enabling larger amounts within the cell and a simplified future processing. It has to be researched, how this integration affects the electro-chemical performance and the aspired safety increase. In both cases a comprehensive chemical analytic control, especially of the evolved gaseous decomposition compounds during thermal runa-way shall help to understand the decomposition mechanism and the effect of the applied flame-retardants.