Influences of Ionic Additive Tetrabutylammonium-bis(fluorosulfonyl)imide on Performance of Lithium Metal Batteries†

doi:10.7503/cjcu20180316

Abstract

Abstract:

An ionic compound, tetrabutylammonium-bis(fluorosulfonyl)imide(TBA-FSI) was employed as an additive to lithium metal batteries. The 1 mol/L lithium bis(trifluoromethanesulfonyl)imide(LiTFSI)-based 1,3-dioxolane(DOL)/dimethoxyethane(DME) electrolyte showed high compatibility toward lithium metal anode when 5%(mass fraction) TBA-FSI was added owing to the formation of a LiF-, Li₃N- riched solid electrolyte interpase(SEI) film on lithium metal anode. As a result, the lithium dendrite growth was significantly restricted and coulombic efficiency of Li|Cu cells was markedly enhanced.

Key words: Lithium metal battery, Lithium metal anode, Lithium dendrite, Additive, Tetrabutylammonium-bis(fluorosulfonyl)imide(TBA-FSI)

CLC Number:

O646

TrendMD:

WANG Fengchun, ZHOU Wanli. Influences of Ionic Additive Tetrabutylammonium-bis(fluorosulfonyl)imide on Performance of Lithium Metal Batteries^†[J]. Chem. J. Chinese Universities, 2018, 39(11): 2529.

Figures/Tables 7

Fig.1 Cyclic voltammetry at 1 mV/s on Cu electrode in 1.0 mol/L LiTFSI DOL/DME(1:1, volume ratio) without or with 5% TBA-FSIThe lithium foil was used as counter and reference electrodes, respectively.

Fig.2 Cycling performance of Li|Li cells containing 1 mol/L LiTFSI DOL/DME(1:1) without or with 5% TBA-FSI

Fig.3 Cycling performance of Li|Cu cells cycled in 1 mol/L LiTFSI DOL/DME(1:1) without or with 5% TBA-FSI at 0.5 mA/cm2 with areal capacity of 1 mA·h/cm2

Fig.4 Impedance spectra of Li|Cu cells containing 1 mol/L LiTFSI DOL/DME(1:1) without(A) or with(B) 5% TBA-FSI

Fig.5 SEM images of lithium metal anodes before cycling(A) and harvested from Li|Cu cells after cycled for 50 times in 1 mol/L LiTFSI DOL/DME(1:1) without(B) or with(C) 5% TBA-FSI at 0.5 mA/cm2 with areal capacity of 1 mA·h/cm2

Fig.6 XPS spectra of lithium metal anodes harvested from Li|Cu cells without or with 5% TBA-FSI after 10 cycles with 1 mA·h/cm2 at 0.5 mA/cm2(A) Survey spectrum, without TBA-FSI; (B) survey spectrum with 5% TBA-FSI; (C) N1s spectra; (D) F1s spectra.

Fig.7 Cycling performance of Li|LiFePO4 cells cycled in 1 mol/L LiTFSI DOL/DME(1:1) without or with 5% TBA-FSI

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