Novel Electrolyte Containing Li[(CF3SO2)(n-C4F9SO2)N] for High Voltage LiNi0.5Mn1.5O4-based Cell†

doi:10.7503/cjcu20170745

Abstract

Abstract:

A novel electrolyte based on lithium(trifluoromethanesulfonyl)-(n-nonafluorobutanesulfonyl)imide {Li[(CF₃SO₂)(n-C₄F₉SO₂)N], LiTNFSI} and propylene carbonate(PC) for LiNi_0.5Mn_1.5O₄??Li cell was reported. The specific conductivity, anodic stability of the 1.0 mol/L LiTNFSI-PC(propylene carbonate) and the cycling performance of LiNi_0.5Mn_1.5O₄??Li cell were investigated. It is found that the 1.0 mol/L LiTNFSI-PC delivers decent specific conductivity(3.6 mS/cm) and high anodic stability[5.72 V(vs. Li/Li⁺)]. Furthermore, the LiNi_0.5Mn_1.5O₄??Li cell with 1.0 mol/L LiTNFSI-PC keeps capacity retention up to 99.7% after 100 cycles at 0.2C and the open circuit voltage stays up to 4.68 V after aging at 60 ℃ for 30 h, which is much better than that in LiPF₆-based electrolyte. This excellent electrochemical performance of LiNi_0.5Mn_1.5O₄??Li cell with 1.0 mol/L LiTNFSI-PC is mainly ascribed to the relatively high-quality cathode electrolyte interphase formed on LiNi_0.5Mn_1.5O₄.

Key words: Lithium-ion battery, LiNi_0.5Mn_1.5O₄??Li cell, Electrolyte, Lithium(trifluoromethanesulfonyl)-(n-nonafluorobutanesulfonyl)imide, Interface compatibility, Propylene carbonate

CLC Number:

O646

TrendMD:

TONG Bo, ZHANG Zhongxiang, LIU Zhenjie, PENG Zhangquan, ZHOU Zhibin. Novel Electrolyte Containing Li[(CF₃SO₂)(n-C₄F₉SO₂)N] for High Voltage LiNi_0.5Mn_1.5O₄-based Cell^†[J]. Chem. J. Chinese Universities, 2018, 39(7): 1518.

Figures/Tables 7

Fig.1 Ionic conductivity of 1.0 mol/L LiTNFSI-PC(a) and 1.0 mol/L LiPF6-PC(b) electrolytes as a function of temperature

Fig.2 Linear sweep voltammetry curves obtained on planner Pt electrode of two [LiTNFSI-PC(a) and LiPF6-PC(b)] at 1 mV/s from the open circuit voltage to 6.0 V(vs. Li/Li+)

Fig.3 Charge/discharge curves of the LiNi0.5Mn1.5O4??Li cells with 1.0 mol/L LiTNFSI-PC(A) and LiPF6-PC(B) electrolytes, respectively

Fig.4 Cycling performance of the LiNi0.5Mn1.5O4??Li cells with 1.0 mol/L LiTNFSI-PC and LiPF6-PC electrolytes at room temperature

Fig.5 Self-discharge curves of LiNi0.5Mn1.5O4??Li cells storage at 60 ℃ with 1.0 mol/L LiPF6-PC(a) and LiTNFSI-PC(b) electrolytes at full-charged state

Fig.6 SEM images of the LiNi0.5Mn1.5O4 surfaces after cycling 10 cycles in the LiNi0.5Mn1.5O4??Li at 0.2C(A) pristine LiNi0.5Mn1.5O4 and the electrodes cycled in 1.0 mol/L LiPF6-PC(B) and 1.0 mol/L LiTNFSI-PC(C), respectively

Fig.7 XPS spectra of the LiNi0.5Mn1.5O4 in the LiNi0.5Mn1.5O4??Li cells after 10 cycles at 0.2C, as well as the fresh one for comparison^ (A) C1s; (B) F1s. a. Fresh; b. LiPF6; c. LiTNFSI.

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Novel Electrolyte Containing Li[(CF₃SO₂)(n-C₄F₉SO₂)N] for High Voltage LiNi_0.5Mn_1.5O₄-based Cell^†

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