An Electrolyte with Elevated Average Valence for Suppressing the Capacity Decay of Vanadium Redox Flow Batteries

Wang, Zhenyu1; Guo, Zixiao1; Ren, Jiayou1; Li, Yiju2; Liu, Bin1; Fan, Xinzhuang1; Zhao, Tianshou1,2

2022-12-01

10.1021/acscentsci.2c01112

ACS Central Science   影响因子和分区

2374-7943

2374-7951

Nafion series membranes are widely used in vanadium redox flow batteries (VRFBs). However, the poor ion selectivity of the membranes to vanadium ions, especially for V2+, results in a rapid capacity decay during cycling. Although tremendous efforts have been made to improve the membrane's ion selectivity, increasing the ion selectivity without sacrificing the proton conductivity is still a challenging issue. In this work, instead of focusing on enhancing the membranes' ion selectivity, we develop an efficient valence regulation strategy to suppress the capacity decay caused by the crossover of V2+ in VRFBs. Despite the discharge capacity of the VRFB with the elevated average valence electrolytes (V3.68+) being slightly lower than that with commercial electrolytes (V3.50+) in the first 35 cycles, the accumulated discharge capacity in 400 cycles is improved by 52.33%. Moreover, this method is efficient, is easy to scale up, and provides deep insights into the capacity decay mechanism of VRFBs.

SCI ; EI

英语

通讯

Shenzhen-Hong Kong-Macao Science and Technology Program (Category C)[SGDX2020110309460000] ; Natural Science Foundation of Guangdong Province[2021A1515011821]

Chemistry

Chemistry, Multidisciplinary

WOS:000905338200001

AMER CHEMICAL SOC

20225213316961

Flow batteries ; Ions ; Membranes ; Vanadium

Vanadium and Alloys:543.6 ; Electric Batteries and Fuel Cells:702 ; Secondary Batteries:702.1.2 ; Chemical Agents and Basic Industrial Chemicals:803 ; Chemical Products Generally:804 ; Materials Science:951

Web of Science

1.Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Kowloon, Hong Kong 999077, Peoples R China
2.Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen 518055, Peoples R China

Wang, Zhenyu,Guo, Zixiao,Ren, Jiayou,et al. An Electrolyte with Elevated Average Valence for Suppressing the Capacity Decay of Vanadium Redox Flow Batteries[J]. ACS Central Science,2022,9(1):56-63.

Wang, Zhenyu.,Guo, Zixiao.,Ren, Jiayou.,Li, Yiju.,Liu, Bin.,...&Zhao, Tianshou.(2022).An Electrolyte with Elevated Average Valence for Suppressing the Capacity Decay of Vanadium Redox Flow Batteries.ACS Central Science,9(1),56-63.

Wang, Zhenyu,et al."An Electrolyte with Elevated Average Valence for Suppressing the Capacity Decay of Vanadium Redox Flow Batteries".ACS Central Science 9.1(2022):56-63.