Kawasoko Hideyuki, Shirasawa Tetsuroh, Nishio Kazunori, Shimizu Ryota, Shiraki Susumu, Hitosugi Taro
Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8577, Japan.
National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan.
ACS Appl Mater Interfaces. 2021 Feb 3;13(4):5861-5865. doi: 10.1021/acsami.0c21586. Epub 2021 Jan 25.
Solid-state lithium (Li) batteries using spinel-oxide electrode materials such as LiNiMnO are promising power supplies for mobile devices and electric vehicles. Here, we demonstrate stable battery cycling between the LiNiMnO and LiNiMnO phases with working voltages of approximately 2.9 and 4.7 V versus Li/Li in solid-state Li batteries with contamination-free clean LiPO/LiNiMnO interfaces. This clean interface has the effect of doubling the capacity of conventional battery cycling between the LiNiMnO and LiNiMnO phases. We also investigated the structural changes between the LiNiMnO and LiNiMnO phases during battery cycling. Furthermore, we found an inhomogeneous distribution of the LiNiMnO phase in the LiNiMnO electrode, induced by spontaneous Li migration after the formation of the LiPO/LiNiMnO interface. These results indicate that the formation of a contamination-free clean LiPO/LiNiMnO interface is key to increase the battery capacity.
使用诸如LiNiMnO等尖晶石氧化物电极材料的固态锂电池是移动设备和电动汽车很有前景的电源。在此，我们展示了在具有无污染物的清洁LiPO/LiNiMnO界面的固态锂电池中，LiNiMnO和LiNiMnO相之间在相对于Li/Li约2.9 V和4.7 V的工作电压下实现稳定的电池循环。这种清洁界面具有使LiNiMnO和LiNiMnO相之间传统电池循环容量翻倍的效果。我们还研究了电池循环过程中LiNiMnO和LiNiMnO相之间的结构变化。此外，我们发现LiPO/LiNiMnO界面形成后，由于锂的自发迁移，LiNiMnO电极中LiNiMnO相存在不均匀分布。这些结果表明，形成无污染物的清洁LiPO/LiNiMnO界面是提高电池容量的关键。
