Development of Solid Electrolytes for Solid-State Lithium Batteries

内容：开发安全、经济的高能量密度全固态锂电池可以实现可持续道路交通系统的梦想。主要有两个原因推动了对此类系统的研究。首先，具有液体电解质（LE）的最先进的锂离子电池（LIB）由于其在恶劣条件下的易燃性和不稳定性而带来安全性和可靠性问题。其次，目前不可能使用Li金属作为阳极，这限制了电池的能量密度。在这方面，固体电解质（SE）表现出几个优点：SE抑制Li枝晶形成，不可燃，并且能够实现全固态电池（ASSB）的高功率密度。尽管SSB具有明显的优势，但由于稳定且高性能的Li+运输SE的可用性有限，SSB的使用目前被推迟。目的：该项目的总体目标是开发具有高界面和电化学稳定性的新型先进Li+导电固体电解质，用于下一代全固态锂电池，并开发先进的概念来构建全固态锂电池。方法：该项目将通过两条路线重点解决关键挑战。所选择的Li+传输SE将被适当地改性以获得增加的界面稳定性并降低晶界电阻。在第二种方法中，将筛选具有高稳定性的新型含锂氟化物化合物，并将开发选定的系统以增强Li+导电性并集成到固态电池中。

Context: The development of safe and cost-effective high energy density all-solid-state lithium batteries can realize the dream of the sustainable road transport system. Mainly two reasons are driving research on such systems. First, the state-of-the-art lithium-ion batteries (LIBs) with liquid electrolytes (LEs) pose safety and reliability issues due to their flammability and instability under harsh conditions. Second, the use of Li metal as an anode is not possible at the moment which limits the energy density of the batteries. In this regard, solid electrolytes (SEs) exhibit several advantages: SEs suppress Li dendrite formation, non-flammable, and enable high power density for all-solid-state batteries (ASSBs). Despite their obvious advantages, the use of SSBs is currently delayed by the limited availability of stable and high performant Li+ transporting SEs. Objectives: The overall objective of this project is to develop new and advanced Li+ conducting solid electrolytes with high interfacial and electrochemical stability for its employment in future generation all-solid-state lithium batteries and to develop advanced concepts to build all-solid-state lithium batteries.Approach: The project will focus on key challenges via two routes. Selected Li+ transporting SEs will be modified suitably to attain increased interfacial stability and to reduce the grain boundary resistance. In a second approach, novel Li-containing fluoride compounds with high stability will be screened, and selected systems will be developed for enhanced Li+ conductivity and integration in solid-state battery cells.