Dead-zone-compensated design as general method of flow field optimization for redox flow batteries

Author:

Pan Lyuming12ORCID,Sun Jing3ORCID,Qi Honghao12,Han Meisheng12,Dai Qiuxia24ORCID,Xu Junhui24ORCID,Yao Shengxin24ORCID,Li Quanlong5ORCID,Wei Lei12ORCID,Zhao Tianshou12

Affiliation:

1. Department of Mechanical and Energy Engineering, Shenzhen Key Laboratory of Advanced Energy Storage, Southern University of Science and Technology, Shenzhen 518055, China

2. Joint Research Center on Energy Storage Technology in Salt Caverns, Shenzhen 518055, China

3. Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Hong Kong 999077, China

4. Jiangsu Engineering Research Center for Comprehensive Utilization of Well and Rocks Salt, Chinasalt Jintan Co., Ltd., Changzhou 213200, China

5. Dalian Rongke Power Co., Ltd., Dalian 116025, China

Abstract

One essential element of redox flow batteries (RFBs) is the flow field. Certain dead zones that cause local overpotentials and side effects are present in all conventional designs. To lessen the detrimental effects, a dead-zone-compensated design of flow field optimization is proposed. The proposed architecture allows for the detection of dead zones and their compensation on existing flow fields. Higher reactant concentrations and uniformity factors can be revealed in the 3D multiphysical simulation. The experiments also demonstrate that at an energy efficiency (EE) of 80%, the maximum current density of the novel flow field is 205 mA cm −2 , which is much higher than the values for the previous ones (165 mA cm −2 ) and typical serpentine flow field (153 mA cm −2 ). Extensions of the design have successfully increased system EE (2.7 to 4.3%) for a variety of flow patterns. As a result, the proposed design is demonstrated to be a general method to support the functionality and application of RFBs.

Funder

National Key R&D Program of China

National Natual Science Foundation of China

Shenzhen Key Laboratory of Advanced Energy Srotage

Joint Research Center on Energy Storage Technology in Salt Caverns Program

Publisher

Proceedings of the National Academy of Sciences

Subject

Multidisciplinary

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