Zhang, Gangning; Lu, Shigang; Zhao, Shangqian; Zhang, Li; Sun, Haobo published the artcile< Revealing the Local Cathodic Interfacial Chemism Inconsistency in a Practical Large-Sized Li-O2 Model Battery with High Energy Density to Underpin Its Key Cyclic Constraints>, Electric Literature of 112-63-0, the main research area is lithium oxygen secondary battery cathode electrolyte interface overcharging; Li2CO3; LiAc·2H2O; high energy density; large-sized Li−O2 battery; local chemism inconsistency; rechargeability.
Due to the theor. ultrahigh energy d. of the Li-O2 battery chem., it has been hailed as the ultimate battery technol. Yet, practical Li-O2 batteries usually need to be designed in a large-sized pattern to actualize a high specific energy d., and such batteries often cannot be cycled effectively. To understand the inherent reasons, we specially prepared large-sized (13 cm x 13 cm) Li-O2 model batteries with practical energy output (6.9 Ah and 667.4 Wh/kgcell) for investigations. By subregional and postmortem anal., the cathode interface was found to have severe local inhomogeneity after discharge, which was highly associated with the electrolyte and O2 maldistribution. The quant. results by XPS evidenced that this local inhomogeneity can exacerbate the generation of lithium acetate during charge, where the locally higher ratio of unutilized carbon surface and less Li2O2 after discharge would result in increased lithium acetate formation for a subsequent local overcharge. Moreover, verification experiments proved that the byproduct lithium acetate, which had been of less concern, was recalcitrant and triggered much larger polarization compared with the commonly reported byproduct Li2CO3 during battery operations, further revealing the key limiting factors leading to the poor recharge-ability of batteries by its accumulation at a pouch-type cell level.
ACS Applied Materials & Interfaces published new progress about Battery capacity. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Electric Literature of 112-63-0.
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