Prussian Blue Nanolayer-Embedded Separator for Selective Segregation of Nickel Dissolution in High Nickel Cathodes

• DOI: 10.1021/acs.nanolett.1c03973
• Publication Date: 2021-12-13T18:23:21Z
• Authors: Changhyun Park; Min-Ho Kim; Sangho Ko; Chanhee Lee; Ahreum Choi; Taewon Kim; Jinwoo Park; Dong Woog Lee; Seok Woo Lee; Hyun-Wook Lee
• Keywords: Prussian blue; Separator (oil production)

Transition metal layered oxides (LiNixCoyMn1-x-yO2, NCM) have been considered as one of the most promising cathodes for lithium-ion batteries used in long-mileage electric vehicles and energy storage systems. Despite its potential interest, dissolved transition (TM) ions toward anode sides can catalyze parasitic reactions such electrolytic decomposition dendritic Li growth, ultimately leading to catastrophic safety hazards. In this study, we demonstrate that Prussian Blue (PB) nanoparticles anchored a commercial PE separator significantly reduce cell resistance effectively suppress TM crossover during cycling, even under harsh conditions accelerate Ni dissolution. Therefore, using PB-coated condition intentionally dissolve Ni2+ at high cutoff 4.6 V, NCM||graphite full cells maintain 50.8% their initial capacity 150th cycle. Scalable production through facile synthetic methods help establish new research direction design high-energy-density batteries.