Preparation of sulfonated poly（ether ether ketone） amphoteric ion exchange membrane and its application in iron-chromium redox flow battery

doi:10.19799/j.cnki.2095-4239.2021.0050

Abstract

Abstract:

An amphoteric ion-exchange membrane (SPEEK/PEI) was prepared in accordance with the demand for the Fe-Cr redox flow battery. An efficient hydrogen bond network was formed by introducing highly hydrophilic polyethyleneimine (PEI) into poly(ether ether ketone) (SPEEK). By introducing PEI with an amino group, the swelling ratio of the SPEEK membrane was effectively reduced, and the permeability of Fe²⁺ and Cr³⁺was inhibited. Furthermore, high proton conductivity was maintained owing to the formation of hydrophilic channels by PEI. Based on the efficient hydrogen bonding network, SPEEK/PEI membranes can effectively improve the Coulombic efficiency and energy efficiency of Fe-Cr redox flow batteries. The Coulombic efficiency of a 3% SPEEK/PEI membrane was 96.5%, and energy efficiency was 79.4% in the performance testing of the Fe-Cr redox flow battery at an ampere density of 70 mA/cm².

Key words: iron-chromium redox flow battery, ion selectivity, sulfonated poly(ether ether ketone), polyacetimide, membrane

CLC Number:

TM 912

Rong ZHANG, Shuguang WANG, Xuan SUN, Xiaosong JIANG, Lei HU, Xiaoming YAN, Gaohong HE. Preparation of sulfonated poly（ether ether ketone） amphoteric ion exchange membrane and its application in iron-chromium redox flow battery[J]. Energy Storage Science and Technology, 2021, 10(4): 1305-1310.

Figures/Tables 7

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膜	厚度/μm	离子交换容量 /mmol·g^-1	溶胀率/%	吸水率/%	离子电导率/mS·cm^-1	Fe²⁺ 渗透率×10⁹ /cm²·s^-1	Cr³⁺渗透率×10⁹ /cm²·s^-1
SPEEK	50	2.05	8.3	21.5	104	7.03	8.13
SPEEK/PEI 1%	51	1.98	7.8	19.7	99	7.28	8.25
SPEEK/PEI 3%	52	1.88	7.1	17.7	94	7.58	8.70
SPEEK/PEI 5%	50	1.64	7.1	16.3	72	6.92	7.83
SPEEK/PEI 10%	51	1.43	5.6	13.3	47	5.47	6.62

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