Vinyl ethylene carbonate as an additive to ionic liquid electrolyte for lithium ion batteries

Abstract

In this research, we investigated the potential application of vinyl ethylene carbonate (VEC) and ethylene carbonate (EC) as solid electrolyte interface (SEI) filmforming additive in 1-ethyl-3-methylimidazolium (EMI)-bis(trifluoromethyl-sulfonyl) imide (TFSI)-LiTFSI ionic liquid electrolyte (IL). The electrochemical performance of natural graphite (NG7) was studied in LiTFSI/EMI-TFSI containing different weight percent of EC/VEC via cyclic voltammetry (CV), electrochemical impedance spectrum (EIS), and galvanostatic charge/discharge cycles. Temperature effect on the discharge/charge performance of NG7 electrode in the researched IL electrolyte was also discussed.

Solid electrolyte interphase formation on metallic lithium

“…In addition, there are very few works testing metallic-lithium [20][21][22], while in the case of the graphite anode, there are numerous studies. In the latter case attention is focused on charging/discharging efficiency [23][24][25][26][27][28][29], SEM observations of the graphite surface [8, 14, 23-25, 27, 29-31] and EIS analysis [23,24,29,30,[32][33][34][35].…”

“…In addition, in some papers, only the LiC 6 anode was studied [11,[23][24][25][27][28][29][30], while in others, the complete cell was tested [13,[36][37][38][39][40][41]. The additives improving Li and LiC 6 performance were usually tested in electrolytes based on cyclic carbonates or carbonate mixtures, exhibiting SEI forming properties by themselves.…”

Electrochemical Lithium Intercalation within Graphite from Ionic Liquids containing BDMI+Cation

“…[1][2][3][4][5][6][7][8][9][10] 이처럼 EMI계의 이온성 액체가 주된 연구 대상이 되고 있 는 이유는 다양한 음이온과 조합하여 융점과 점성이 낮은 이온성 액체를 용이하게 제조할 수 있기 때문이다. 그렇 지만 EMI계의 이온성 액체는 일반적으로 전위창이 매우 좁으며 전기화학적 내환원성이 좋지 않은 것으로 알려져 있으며, [11][12][13] 이것은 첨가제를 사용하거나 또는 EMI + 양이 온 및 음이온의 화학적 구조를 변형하는 방법에 의해 어느 정도 개선할 수 있음이 보고되어 있다.…”

“…그렇 지만 EMI계의 이온성 액체는 일반적으로 전위창이 매우 좁으며 전기화학적 내환원성이 좋지 않은 것으로 알려져 있으며, [11][12][13] 이것은 첨가제를 사용하거나 또는 EMI + 양이 온 및 음이온의 화학적 구조를 변형하는 방법에 의해 어느 정도 개선할 수 있음이 보고되어 있다. 2,3,7,8) …”

Influence of vinylene carbonate as an additive on the electrochemical performances of graphite electrode in poly(methyl methacrylate) gel polymer electrolytes

“…Up to now, many film-forming additives such as SO 2 [12], Li 2 CO 3 [13][14][15], K 2 CO 3 [16,17], ethylene sulfite [18], propylene sulfite [19], vinyl ethylene sulfite [20], and vinylethylene carbonate [21][22][23][24][25] were successfully used to improve the electrochemical performance and to modify the surface chemistry of graphite or Si anodes for lithium-ion batteries.…”