NCM 811/LiPON全固态锂电池的制备与性能研究

Preparation and performance study of NCM 811/LiPON all-solid-state lithium battery

LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM 811),具有高比容量、价格低廉以及环境友好等优点在固态电池领域已有较多学者研究。然而,较厚的固态电解质(>20μm)影响了其能量密度。作为一种常见的薄膜固态电解质,锂磷氧氮(LiPON)在薄膜固态电池领域受到普遍的关注。目前,尚未有研究将涂布的NCM 811与LiPON薄膜型电解质组合的固态电池。本工作以商业单面辊压NCM 811为阴极,结合磁控溅射LiPON电解质薄膜,Li箔为阳极成功制备全固态锂电池。循环测试结果表明,NCM 811/LiPON/Li箔全固态锂电池在15μA cm^(-2)电流密度下循环60圈后仍有54.85μAh cm^(-2)的面积比容量。且表现出优异的循环稳定性和倍率性能。此工作证明NCM 811阴极与LiPON电解质薄膜结合的全固态电池的制备是可行的,为NCM 811全固态电池的开发提供了一种新思路。

LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM 811)has been extensively researched by scholars in solid-state batteries due to its high specific capacity,low price and environmentally friendly.However,the relatively thick solid electrolyte(>20μm)limits its energy density.Lithium phosphorus oxynitride(LiPON),as a common thin-film solid electrolyte,has received widespread attention in the thin-film solid-state battery field.Despite is,there hasn't been any research on combining coated NCM 811 with a LiPON thin-film electrolyte to prepare a solid-state battery.Therefore,in this work,the all-solid-state lithium battery was successfully prepared by using the commercial single-side rolled NCM 811 as the cathode,a LiPON electrolyte thin film deposited via magnetron sputtering,with Li foil as the anode.Testing results showed that the NCM 811/LiPON/Li foil all-solid-state lithium battery achieved an areal capacity of 54.85μAh cm^(-2)after 60 cycles at a current density of 15μA cm^(-2).Moreover,the battery exhibited excellent cycling stability and rate performance,providing evidence that the preparation of all-solid-state batteries that combine NCM 811 cathodes with LiPON electrolyte thin films is feasible,offering a new avenue for the development of NCM 811 all-solid-state batteries.