Significantly enhanced electrochemical performance of a ZnCo2O4 anode in a carbonate based electrolyte with fluoroethylene carbonate. Issue 30 (27th March 2017)

• Record Type: Journal Article
• Authors: Rong, Haibo; Jiang, Zhongqing; Cheng, Si; Chen, Bohong; Zhen, Zihao; Deng, Binglu; Qin, Yanmin; Xie, Guiting; Jiang, Zhong-Jie; Liu, Meilin
• Is Part Of: RSC advances. Volume 7:Issue 30(2017)
• Page Start: 18491
• Page End: 18499
• Publication Date: 2017-03-27
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c7ra01821e
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : A facile inexpensive and effective way to improve the performance of a Li/ZnCo2 O4 cell by using fluoroethylene carbonate as an additive to the conventional carbonate-based electrolyte has been reported. Abstract : The influence of fluoroethylene carbonate (FEC) as an additive to the conventional electrolyte of ethylene carbonate and dimethyl carbonate with lithium hexafluorophosphate on the electrochemical performance of the Li/ZnCo2 O4 cell has been investigated. The addition of FEC is found to promote the formation of a more uniform and stable solid electrolyte interphase (SEI) layer with the thinner thickness on the surface of ZnCo2 O4, which could reduce the charge transfer resistance and SEI resistance, increase the diffusivity of the lithium ions in the ZnCo2 O4 electrode, and improve the stability of ZnCo2 O4 during the repeated discharge/charge process. In addition, the formation of less LiF on the ZnCo2 O4 surface could also be observed when FEC is added to the electrolyte, which decreases the interfacial impedance of the electrode materials. The Li/ZnCo2 O4 cell in the electrolyte with FEC therefore exhibits substantially improved coulombic efficiency, reversible capacity, and long-term stability. The results make us believe that the addition of FEC could be a promising method to fabricate LIBs with improved performance.