| 초록 |
The ternary transition metal layered oxides (LiNi1-x-yCoxMnyO2) have been considered as one of the most promising candidates for long-mileage electric vehicles (EVs) and energy storage systems (ESSs) by pushing the nickel content to ＞60%. Despite its potential alternative to achieve high specific energy of ＞250 Wh kg-1 as a cell level, its chronic issues, such as Li+/Ni2+ mixing phenomenon and Ni dissolution, still hinder its practical applications in the battery industry field. In particular, dissolved transition metal ions toward anode sides can catalyze unwanted parasitic reactions such as electrolytic decomposition and dendritic Li growth, ultimately leading to catastrophic safety hazards. In this presentation, we demonstrate that Prussian Blue (PB) nanoparticles anchored to the commercial PE separator can effectively suppress the TM crossover during the cycling, even at high cut-off voltages of 4.6V. Consequently, NCM/graphite full cells with a PB-coated separator could maintain 50.8 % of the initial capacity at the 150th cycle under high voltage conditions. PB nanoparticle improves electrolyte uptake up to 300% by endowing a separator with electrolyte affinity, significantly reducing cell resistance. In addition to its superior performances, scalable production of our PB-separator through the facile synthetic methods can help us establish a new research direction for the design of high-energy-densities batteries. |
