State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China.
Adv Mater. 2018 Sep;30(39):e1803270. doi: 10.1002/adma.201803270. Epub 2018 Aug 21.
The Li-O battery (LOB) is considered as a promising next-generation energy storage device because of its high theoretic specific energy. To make a practical rechargeable LOB, it is necessary to ensure the stability of the Li anode in an oxygen atmosphere, which is extremely challenging. In this work, an effective Li-anode protection strategy is reported by using boric acid (BA) as a solid electrolyte interface (SEI) forming additive. With the assistance of BA, a continuous and compact SEI film is formed on the Li-metal surface in an oxygen atmosphere, which can significantly reduce unwanted side reactions and suppress the growth of Li dendrites. Such an SEI film mainly consists of nanocrystalline lithium borates connected with amorphous borates, carbonates, fluorides, and some organic compounds. It is ionically conductive and mechanically stronger than conventional SEI layer in common Li-metal-based batteries. With these benefits, the cycle life of LOB is elongated more than sixfold.
锂电池（LOB）因其高理论比能量而被认为是一种很有前途的下一代储能设备。为了制造实用的可充电 LOB，有必要确保在氧气气氛中锂阳极的稳定性，这极具挑战性。在这项工作中，通过使用硼酸（BA）作为固体电解质界面（SEI）形成添加剂，报告了一种有效的锂阳极保护策略。在 BA 的辅助下，在氧气气氛中，在锂金属表面形成了连续且致密的 SEI 膜，这可以显著减少不必要的副反应并抑制锂枝晶的生长。这种 SEI 膜主要由纳米晶硼酸锂与无定形硼酸、碳酸盐、氟化物和一些有机化合物相连。它在离子上是导电的，在机械上比普通锂金属基电池中的常规 SEI 层更强。有了这些好处，LOB 的循环寿命延长了六倍以上。
