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

• DOI: 10.1016/j.electacta.2018.11.036
• Publication Date: 2018-11-08T14:17:46Z
• Authors: Xiaodan Yan; Lingzhi Zhang; Jidian Lu
• Keywords: Thermal Stability; Organosilicon

Abstract CN(CH2)2Si(CH3)(OCH2CH2OCH3)2 (BNS) is used as electrolyte solvent to improve the safety for LiNi1/3Co1/3Mn1/3O2 (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.