Stabilized high-voltage performance of lithium-ion batteries via dual anode and cathode stabilizer additives introduction

Abstract

High-voltage operation with LiNixMnyCo1-x-yO2 (NMC) cathodes is gaining tremendous attention for high energy density lithium-ion batteries (LIBs) that can transform and store energy for medium- and large-scale applications. However, due to severe continuous electrolyte decomposition and instability of the electrode surface, which are typically present in high cut-off voltage cycling, it is challenging to minimize the negative effects of rapid capacity fading over short cycle durations. Herein, [4,4-bi(1,3,2-dioxathiolane)] 2,2,2,2,2-tetraoxide (BDTT) is used as a novel cathode stabilizing additive coupled with vinylene carbonate, a well-known anode stabilizing additive, to improve the high-voltage performance of a LiNi0.5Mn0.3Co0.2O2/graphite full cell. A synergistic improvement in cycling performance of the dual cathode and anode stabilizer additive inclusion results in high capacity and 11.9% higher retention after 200 cycles. In charge and discharge cycles, reduction of IR drop and polarization is obtained by combination of dual additives. The results manifestly show the significance of introducing novel additives and the capability of combining additives to enhance the performance of lithium-ion batteries at high-voltage.