The effect of lithium bis(ﬂuorosulfonyl)imide salt on the performance of Li-ion battery

doi:10.12028/j.issn.2095-4239.2016.0033

Abstract

Abstract: LiPF6 salt was substituted by new salt LiFSI in the electrolyte and comparing researches between them were done. LiFSI/ EC+EMC+DMC (mass ratio was 1∶1∶1) with different concentrations (0.8—1.6 mol/L) were prepared. The effect of lithium salt concentration and electrolyte physicochemical parameters on the rate performance was studied by cyclic voltammetry (CV), electrochemical impedance spectroscopy(EIS), galvanostatic charge-discharge testing, along with physicochemical parameters testing of Li+ transference number, conductivity and viscosity. It was found that the electronic conductivity and Li+ transference number of LiFSI electrolytes are both larger than LiPF6 electrolyte with same salt concentration. In the range of 0.8 mol/L to 1.6 mol/L, Li-ion batteries using LiFSI electrolytes show better electrochemical performances than those with LiPF6 electrolytes. The optional concentration of LiFSI electrolyte is 1.2 mol/L, when ionic conductivity and Li+ transference number are both the maximum(=12.39 ms/cm, t+=0.6327). Li-ion batteries with 1.2 mol/L LiFSI electrolyts have best rate performance.

Key words: LiFSI, lithium salt concentration, Li+ transference number, conductivity, Li-ion battery

LI Meng1,2, QIU Jingyi1,2, ZHANG Songtong1,2, YU Zhongbao1,2，RAO Lei3, LIAO Hongying4. The effect of lithium bis(ﬂuorosulfonyl)imide salt on the performance of Li-ion battery[J]. Energy Storage Science and Technology, 2017, 6(1): 101-107.

References

[1] 李萌, 邱景义, 余仲宝. 高功率锂离子电池电解液中导电锂盐的新应用[J]. 电源技术, 2015, 39(1): 191-193.

LI M, QIU J Y, YU Z B. New use of conducting salts in electrolytes of high power Li ion batteries[J]. Chinese Journal of Power Sources, 2015, 39(1): 191-193.

[2] HAN H B, ZHOU S S, ZHANG D J, et al. Lithium bis(ﬂuorosulfonyl)imide (LiFSI) as conducting salt for nonaqueous liquid electrolytes for lithium-ion batteries: Physicochemical and electrochemical properties[J]. Journal of Power Sources, 2011, 196: 3623-3632.

[3] MAURO V, APRANO A , CROCE F, et al. Direct determination of transference numbers of LiClO₄ solutions in propylene carbonate and acetonitrile[J]. Journal of Power Sources, 2005, 141: 167-170.

[4] ZUGMANN S, FLEISCHMANN M, Amereller M, et al. Measurement of transference numbers for lithium ion electrolytes via four different methods, a comparative study[J]. Electrochim Acta, 2011, 56(11): 3926-3933.

[5] 黄峰, 周运鸿. 锂离子电池电解质现状与发展[J]. 电池, 2001, 31(6): 290-293.

HUANG F, ZHOU Y H . Review of electrolytes for lithium-ion batteries[J]. Battery Bimonthly, 2001, 31(6): 290-293.

[6] 唐致远, 薛建军, 李建刚, 等. 聚合物电解质离子迁移数的测定方法[J]. 化学通报, 2001(5): 312-315.

TANG Z Y, XUE J J, LI J G, et al. The test methods of ion transference number of polymer electrolyte[J]. Chemistrymag, 2001(5): 312-315.

[7] 贾铮, 戴长松, 陈玲. 电化学测量方法[M]. 北京: 化学工业出版社, 2006: 100-101.

JIA Z, DAI C S, CHEN L. The instrumental methods in electrochemistry[M]. Beijing: Chemical Industry Press, 2006: 100-101.

[8] 曹楚南, 张鉴清. 电化学阻抗谱导论[M]. 北京: 科学出版社, 2002: 2l-24.

CAO C N, ZHANG J Q. An introduction to electrochemical impedance spectroscopy[M]. Beijing: Science Press, 2002: 2l-24.

[9] 饶蕾, 李萌, 余仲宝, 等. 六氟磷酸锂浓度对锂离子电池性能的影响[J]. 电池, 2015, 45(1): 6-9.

RAO L, LI M, YU Z B, et al. Effects of LiPF6 concentration on the performance of Li-ion battery[J]. Battery Bimonthly, 2015, 45(1): 6-9.

[1]	Long CHEN, Quan XIA, Yi REN, Gaoping CAO, Jingyi QIU, Hao ZHANG. Research prospect on reliability of Li-ion battery packs under coupling of multiple physical fields [J]. Energy Storage Science and Technology, 2022, 11(7): 2316-2323.
[2]	DING Yi, YANG Yan, CHEN Kai, ZENG Tao, HUANG Yunhui. Intelligent fire protection of lithium-ion battery and its research method [J]. Energy Storage Science and Technology, 2022, 11(6): 1822-1833.
[3]	LI Yitao, SHEN Kaier, PANG Quanquan. Advance in organics enhanced sulfide-based solid-state batteries [J]. Energy Storage Science and Technology, 2022, 11(6): 1902-1918.
[4]	Chaochao WEI, Chuang YU, Zhongkai WU, Linfeng PENG, Shijie CHENG, Jia XIE. Research progress of Li₃PS₄ solid electrolyte [J]. Energy Storage Science and Technology, 2022, 11(5): 1368-1382.
[5]	Liangtao XIONG, Jifen WANG, Huaqing XIE, Xuelai ZHANG. Effect of vacancy defects on thermal conductivity of single-layer graphene by molecular dynamics [J]. Energy Storage Science and Technology, 2022, 11(5): 1322-1330.
[6]	Zheng ZHENG, Xiaoshuai WANG, Bin LI, Tao HUANG, Peike LI. Adaptive interleaved control equalization for lithium-ion battery packs based on three-winding transformers [J]. Energy Storage Science and Technology, 2022, 11(4): 1131-1140.
[7]	Zhiqiang ZHAO, Hengjun LIU, Xixiang XU, Yuanyuan PAN, Qinghao LI, Hongsen LI, Han HU, Qiang LI. Magnetometry technique in energy storage science [J]. Energy Storage Science and Technology, 2022, 11(3): 818-833.
[8]	Yuyang LIU, Shunli WANG, Yanxin XIE, Weikang JI, Yixing ZHANG. Research on Li-ion battery modeling and SOC estimation based on online parameter identification and improved 2RC-PNGV model [J]. Energy Storage Science and Technology, 2021, 10(6): 2312-2317.
[9]	Yue SU, Xuhua LIU, Fanglei ZENG, Yurong REN, Bencai LIN. Preparation and properties of polyvinylidene fluoride/polyvinylidene fluoride sulfonate lithium/lithium salt composite solid electrolyte [J]. Energy Storage Science and Technology, 2021, 10(6): 2069-2076.
[10]	Zhuo XU, Lili ZHENG, Bing CHEN, Tao ZHANG, Xiuling CHANG, Shouli WEI, Zuoqiang DAI. Overview of research on composite electrolytes for solid-state batteries [J]. Energy Storage Science and Technology, 2021, 10(6): 2117-2126.
[11]	Bohui LU, Zhicheng SHI, Yongxue ZHANG, Hongyu ZHAO, Zixi WANG. Investigation of the charging and discharging performance of paraffin/nano-Fe₃O₄ composite phase change material in a shell and tube thermal energy storage unit [J]. Energy Storage Science and Technology, 2021, 10(5): 1709-1719.
[12]	Yanfang ZHAI, Guanming YANG, Wangshu HOU, Jianyao YAO, Zhaoyin WEN, Shufeng SONG, Ning HU. Solvothermal synthesis of three-dimensional petaloid garnet electrolyte and its application in solid polymer electrolytes [J]. Energy Storage Science and Technology, 2021, 10(3): 905-913.
[13]	Pu REN, Shunli WANG, Mingfang HE, Yongcun FAN, Wen CAO, Wei XIE. State of health estimation of Li-ion battery based on dual calibration of internal resistance increasing and capacity fading [J]. Energy Storage Science and Technology, 2021, 10(2): 738-743.
[14]	Xie WU, Li ZHOU, Zhaoming XUE. Synthesis and performance of solid polymer electrolytes based on chelated boron lithium salts [J]. Energy Storage Science and Technology, 2021, 10(1): 96-103.
[15]	Zhou JIN, Hailong YU, Wenwu ZHAO, Guangjin ZHAO, Xuejie HUANG. Graphite/nano-Sn composite anode materials for lithium-ion batteries [J]. Energy Storage Science and Technology, 2021, 10(1): 137-142.