Compatibility between LiNi0.5Mn1.5O4 and electrolyte based upon lithium bis(oxalate)borate and sulfolane for high voltage lithium-ion batteries

Abstract To seek the compatibility between LiNi 0.5 Mn 1.5 O 4 and electrolyte based upon lithium bis(oxalate)borate (LiBOB) and sulfolane (SL), the electrochemical performances of 0.7 mol L −1 LiBOB–SL/DMC (1:1) electrolyte are investigated. This electrolyte has characteristic of good stability against oxidative decomposition (5.3 V, vs. Li/Li + ) and satisfactory safety performance. When used in LiNi 0.5 Mn 1.5 O 4 /Li cells, this electrolyte exhibits several advantages, such as stable cycle performance, low cell resistance, good rate performance, and high discharge voltage plateau. It suggests that LiBOB–SL/DMC electrolyte has good compatibility with LiNi 0.5 Mn 1.5 O 4 cathode, and would be an attractive electrolyte for 5 V high voltage lithium-ion batteries based upon LiNi 0.5 Mn 1.5 O 4 cathode.