Electrolyte for lithium ion batteries

A battery cell comprising:

• a cathode comprising a cathode active material disposed on a cathode current collector;
• an anode comprising an anode active material disposed on an anode current collector, the anode oriented towards the cathode such that the anode active material faces the cathode active material;
• a separator disposed between the cathode active material and the anode active material;
• and
• an electrolyte fluid comprising LiPF6, 5 to 40 wt % ethylene carbonate (EC), 20 to 70 wt % propyl propionate (PP), 10 to 50 wt % ethyl propionate (EP), 2 to 20 wt % propylene carbonate (PC), 0.6-0.8 wt % lithium difluoro(oxalato)borate (LiDFOB), 1.3-1.6 wt % prop-1-ene-1, 3-sultone (PES), 2.0-3.0 wt % propane sultone (PS), 6.0-8.0 wt % FEC, 1.5-2.5 wt % succinonitrile (SN), 2.5-3.5 wt % HTCN, and 0.4-0.6 wt % methylene methanedisulfonate (MMDS).