Synergistic additives for high volume lithium ion batteries
This disclosure relates generally to battery cells, and more particularly, electrolyte additives for use in lithium ion battery cells.
1 . 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 0.6-0.8 wt % lithium difluoro(oxalato)borate (LiDFOB), 2.0-3.0 wt % propane sultone (PS), 1.3-1.6 wt % pro-1-ene-1, 3-sultone (PES), 0.4-0.6 wt % methylene methanedisulfonate (MMDS), 0.4-0.6 wt % tris(trimethylsilyl)borate (TMSB), 6.0-8.0 wt % fluoroethylene carbonate (FEC), 1.5-2.5 wt % succinonitrile (SN), 2.5-3.5 wt % 1,3,6-hexanetricarbonitrile (HTCN), LiPF 6 , ethylene carbonate (EC), propylene carbonate (PC), propyl propionate (PP), and ethyl propionate (EP).
2 . The battery cell of claim 1 , wherein the electrolyte fluid comprises 0.7 wt % LiDFOB, 2.5 wt % PS, 1.5 wt % PES, 0.5 wt % MMDS, 0.5 wt % TMSB, 7.0 wt % FEC, 2.0 wt % SN, and 3.0 wt % HTCN of the total electrolyte fluid.
3 . The battery cell of claim 1 , wherein the LiPF 6 is from 0.8 M to 1.6 M.