Developing a nonflammable electrolyte is an efficient strategy to eliminate fire hazards and improve battery safety. Electrolytes containing nonflammable phosphate solvents enhance battery safety to a certain extent, but their compatibility with electrodes remains an obstacle. Here, a nonflammable electrolyte based on carbonate solvent is designed to resolve this dilemma while guaranteeing battery performance. We demonstrate that a nonflammable electrolyte employing the popular film-forming solvent ethylene carbonate (EC) and 1,2-dimethoxyethane (DME) with 2.3 mol kg−1 lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) has excellent thermal stability owing to the unique solution molecule structure. What’s more, the nonflammable electrolyte possesses excellent compatibility with both LiNi0.6Co0.2Mn0.2O2 and graphite electrode. The initial specific capacity and capacity retention rate of graphite/LiNi0.6Co0.2Mn0.2O2 punch cells employing this electrolyte are 169.3 mAh g−1 and 98.7% (after 50 cycles), respectively, which are comparable to those of cells employing traditional carbonate electrolytes. Besides, short-circuit test of the pouch cell suggests that the release of gases accompanied by decomposition of electrolyte under abuse conditions is effectively suppressed. All of these results show a promising prospect of this nonflammable electrolyte for application in high-safety Li-ion batteries.

中文翻译：

---

用于高安全性锂离子电池的不易燃 LiTFSI-碳酸乙烯酯/1,2-二甲氧基乙烷电解质

开发不易燃的电解质是消除火灾隐患和提高电池安全性的有效策略。含有不易燃的磷酸盐溶剂的电解质在一定程度上提高了电池的安全性，但它们与电极的相容性仍然是一个障碍。在这里，一种基于碳酸盐溶剂的不易燃电解质旨在解决这一难题，同时保证电池性能。我们证明了采用流行的成膜溶剂碳酸亚乙酯 (EC) 和 1,2-二甲氧基乙烷 (DME) 与 2.3 mol kg-1 双（三氟甲磺酰）亚胺锂 (LiTFSI) 制成的不易燃电解质由于其独特的特性而具有出色的热稳定性。溶液分子结构。更重要的是，不易燃的电解液与LiNi0.6Co0.2Mn0.2O2和石墨电极都具有极好的相容性。采用该电解质的石墨/LiNi0.6Co0.2Mn0.2O2 冲孔电池的初始比容量和容量保持率分别为 169.3 mAh g-1 和 98.7%（50 次循环后），与采用传统碳酸盐的电池相当电解质。此外，软包电池的短路测试表明，在滥用条件下伴随电解液分解的气体释放得到有效抑制。所有这些结果表明，这种不可燃电解质在高安全性锂离子电池中的应用前景广阔。软包电池的短路测试表明，在滥用条件下伴随电解液分解的气体释放得到有效抑制。所有这些结果表明，这种不可燃电解质在高安全性锂离子电池中的应用前景广阔。软包电池的短路测试表明，在滥用条件下伴随电解液分解的气体释放得到有效抑制。所有这些结果表明，这种不可燃电解质在高安全性锂离子电池中的应用前景广阔。