1, 3, 5-Pentanetricarbonitrile additive for improving high voltage stability of lithium cobalt oxide cells. (1st October 2018)

• Record Type: Journal Article
• Authors: Duan, Boyu; Hong, Bo; Li, Jie; Qin, Zhaoming; Jiang, Feng; Lai, Yanqing
• Is Part Of: Electrochimica acta. Volume 286(2018)
• Page Start: 86
• Page End: 91
• Publication Date: 2018-10-01
• Subjects: 1, 3, 5-Pentanetricarbonitrile -- Electrolyte additive -- High-voltage -- LiCoO2 cathode -- Cathode solid electrolyte interphase; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2018.08.041
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: In this work, 1, 3, 5-Pentanetricarbonitrile (PTN) is adopted as a novel electrolyte additive to improve the electrochemical characteristics of LiCoO2 cathode operating under high charging cut-off voltage. PTN additive generates an extremely stable CEI film with abundant of CN bond and higher content of Lix POy Fz /Lix PFy on the LiCoO2 cathode surface, which is beneficial to inhibit the continuous decomposition of electrolyte and decrease the interfacial impedance. With electrolyte containing 0.5 wt.% PTN, the LiCoO2 cathode shows an initial capacity of 180.1 mAh g −1 with a columbic efficiency of 94.0%, and achieves a capacity retention of 90.7% for 300 cycles at 3.0–4.45 V. It makes the mass specific energy density of LCO cathode increases from 564.7 Wh kg −1 to 728.7 Wh kg −1, which leads to nearly 30% of the additional energy.