4‐Fluorophenylsulfonylacetonitrile as an Electrolyte Additive for Improving the High‐Voltage Performance of LiNi 0.83 Co 0.11 Mn 0.06 O 2 Cathode Batteries

Abstract High‐nickel ternary materials have attracted attention as advanced cathode materials for lithium‐ion batteries (LIBs) owing to their high energy density and low cost. However, the side reactions between carbonate‐based electrolytes and cathode materials under high voltages remain the most significant obstacle to the further application of high‐nickel LIBs. To develop superior LIBs, 4‐fluorobenzenesulfonylacetonitrile (FPSAN) is proposed as a new electrolyte additive to enhance the safety of high‐nickel LIBs. The results demonstrate that the easily decomposed FPSAN can form a protective film on the cathode surface, thereby improving the cycling stability and rate performance of the Li/LiNi 0.83 Co 0.11 Mn 0.06 O 2 half‐cells. The FPSAN additive can also maintain the spinel shape of the LiNi 0.83 Co 0.11 Mn 0.06 O 2 cathode particles. These results indicate that the FPSAN electrolyte additive can facilitate the application of high‐performance LiNi 0.83 Co 0.11 Mn 0.06 O 2 cells.