Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6601731 | Electrochimica Acta | 2018 | 24 Pages |
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 LixPOyFz/LixPFy on the LiCoO2 cathode surface, which is beneficial to inhibit the continuous decomposition of electrolyte and decrease the interfacial impedance. With electrolyte containing 0.5â¯wt.% PTN, the LiCoO2 cathode shows an initial capacity of 180.1â¯mAh gâ1 with a columbic efficiency of 94.0%, and achieves a capacity retention of 90.7% for 300 cycles at 3.0-4.45â¯V. It makes the mass specific energy density of LCO cathode increases from 564.7â¯Wh kgâ1 to 728.7â¯Wh kgâ1, which leads to nearly 30% of the additional energy.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Boyu Duan, Bo Hong, Jie Li, Zhaoming Qin, Feng Jiang, Yanqing Lai,