Improved compatibility of graphite anode for lithium ion battery using sulfuric esters. (1st April 2016)

• Record Type: Journal Article
• Authors: Ding, Zhiying; Li, Xuecheng; Wei, Tingru; Yin, Zhoulan; Li, Xinhai
• Is Part Of: Electrochimica acta. Volume 196(2016)
• Page Start: 622
• Page End: 628
• Publication Date: 2016-04-01
• Subjects: Lithium ion battery -- sulfuric esters -- film formation additive -- electrolyte -- graphite anode; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2016.02.205
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Ethylene sulfate (DTD), propylene sulfite (1, 2-PS) and trimethylene sulfate (1, 3-PCS) were investigated as electrolyte additives in lithium ion battery. Density functional theory (DFT) calculation shows that DTD, 1, 2-PS and 1, 3-PCS possess relatively low lowest unoccupied molecule orbital (LUMO) energies, which is easier to be reduced on the graphite anode. The CV curves, cycling performance and AC impedance of Li/graphite half cells reveal that DTD and 1, 3-PCS were preferentially reduced to form stable SEI films. The initial efficiency, cycling performance and high temperature storage properties were greatly improved in the electrochemical tests by adding 1% DTD to LiCoO2 /graphite battery. The SEM images show that the graphite electrode surface with SEI film formed by adding 1% DTD became smoother and more homogeneous. IR analysis results show that the SEI film included both inorganic components (Li2 SO3 and Li2 CO3 ) and organic components (ROCO2 Li and ROSO2 Li).