Improve safety of high energy density LiNi1/3Co1/3Mn1/3O2/graphite battery using organosilicon electrolyte

CN(CH 2 ) 2 Si(CH 3 )(OCH 2 CH 2 OCH 3 ) 2 (BNS) is used as electrolyte solvent to improve the safety for LiNi 1/3 Co 1/3 Mn 1/3 O 2 (NCM)/graphite battery . BNS increases the thermal stability of the carbonate-based electrolyte with (de) lithiated cathode/anode and the electrochemical stability of coin cells. By using an optimal BNS-based electrolyte formula, 13 Ah NCM/graphite prismatic cell achieves 95.8% retain of capacity at 2 C/3 C (charge/discharge) rate after 600 cycles. Meanwhile, 13 Ah prismatic cell exhibits improved safety performance in the nail penetration test.