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Static and Dynamic Studies on LiNi 1/3 Co 1/3 Mn 1/3 O 2 ‐Based Suspensions for Semi‐Solid Flow Batteries

2016; Wiley; Volume: 9; Issue: 15 Linguagem: Inglês

10.1002/cssc.201600285

1864-564X

Jordi Jacas Biendicho, Cristina Flox, Laura Sanz, J.R. Morante,

Advancements in Battery Materials

Abstract LiNi 1/3 Co 1/3 Mn 1/3 O 2 (LNCM)‐based suspensions for semi‐solid flow batteries (SSFB) have been investigated by galvanostatic charge/discharge an electrochemical impedance spectroscopy (EIS). The resistance and electrochemical performance of half cells (vs. Li/Li + ) as well as the rheological properties are affected by the content of a commercially available electroconductive carbon black [KetjenBlack (KB), AkzoNobel] in the suspensions. In static conditions, a cell with 11.87 and 13.97 % by volume of KB and LNCM delivers high capacity 130 mA h g −1 at 5 mA cm −2 , respectively, and a coulombic efficiency of 90 % over 10 injections. The impedance of half cells is dominated by a contact resistance fitted with a resistor and a constant phase element (CPE) in parallel. In flow conditions, cell potential depends on applied current density and measured over potentials are ∼0.3 and 0.7 V for 0.33 and 1 mA cm −2 , respectively, for a cell containing a suspension with 9.53 % in volume of KB and 13.90 % in volume of LNCM. The effect of the cell contact resistance on the electrochemical performance is discussed.