Electrolyte for 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 LiPF 6 , 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).
2 . The battery cell of claim 1 , wherein the electrolyte fluid comprises 0.7 wt % LiDFOB, 1.5 wt % PES, 2.5 wt % PS, 7.0 wt % FEC, 2.0 wt % SN, 3.0 wt % HTCN, and 0.5 wt % MMDS.
3 . The battery cell of claim 1 , wherein the LiPF 6 has a concentration from 0.8 M to 1.6 M.