电液流量及电流密度对海水激活电池输出特性的影响

doi:10.11949/0438-1157.20250426

摘要/Abstract

摘要：

海水激活电池输出特性是衡量其实用化的关键指标，而电液流量及电流密度作为其运行过程中的重要参数，对电池输出特性的影响尤为显著。通过构建海水激活电池多物理场耦合模型，系统研究了不同电液流量、电流密度对海水激活电池输出特性（电化学特性、传质特性）的影响。结果表明：适当提高电液流量可以有效降低浓差极化，显著提升电池的输出电压和放电能量。电流密度的增加虽能显著提升功率密度，但同时也会加剧浓差极化与欧姆极化效应，降低电池的能量密度。通过熵权法综合评价发现，电液流量250 ml/min与电流密度600 mA/cm²组合下的综合评价值高达0.808，表明电液流量与电流密度的协同优化可有效提高电池的输出特性，为其实际应用提供可靠的理论依据。

关键词: 海水激活电池, 数值模拟, 优化, 对流, 传质, 电化学

Abstract:

The output performance of seawater-activated batteries serves as a pivotal indicator for assessing their commercial viability, where electrolyte flow rate and current density play dominant roles due to their substantial impact on battery behavior. By developing a multiphysics-coupled model, this study comprehensively analyzes the influence of electrolyte flow rate and current density on the battery's output performance (electrochemical response and mass transport). The results show that appropriately increasing the electro-hydraulic flow rate can effectively reduce concentration polarization and significantly improve the output voltage and discharge energy of the battery. Although elevated current densities enhance power density, they aggravate polarization losses (concentration/ohmic), ultimately compromising energy density. Through entropy weight method evaluation, an optimal parameter set (250 ml/min flow rate, 600 mA/cm² current density) achieves a high composite score of 0.808, confirming that coordinated regulation of flow rate and current density maximizes output performance. This work provides a theoretical foundation for the industrial deployment of seawater-activated batteries.

Key words: seawater-activated battery, numerical simulation, optimization, convection, mass transfer, electrochemistry

中图分类号:

TM 911.16

陈培强, 郑群, 姜玉廷, 熊春华, 陈今茂, 王旭东, 黄龙, 阮曼, 徐万里. 电液流量及电流密度对海水激活电池输出特性的影响[J]. 化工学报, 2025, 76(7): 3235-3245.

Peiqiang CHEN, Qun ZHENG, Yuting JIANG, Chunhua XIONG, Jinmao CHEN, Xudong WANG, Long HUANG, Man RUAN, Wanli XU. Effects of electrolyte flow rate and current density on the output performance of seawater-activated batteries[J]. CIESC Journal, 2025, 76(7): 3235-3245.

图/表 15

图1 海水激活电池及其放电原理

Fig.1 Seawater activated battery and its discharge principle

表1 模型几何参数

Table 1 Geometric parameters of the model

参数	数值/mm
阳极长度	100
阳极宽度	100
阳极厚度	0.25
阴极长度	100
阴极宽度	100
阴极厚度	1
阴阳极间隔	0.5
进口直径	12
出口直径	12
进出口处直流道宽度	3
进出口处弧形流道宽度	4

图2 网格及独立性验证

Fig.2 Computation mesh and independence verification

表2 电化学及动力学参数

Table 2 Electrochemical and kinetic parameters

参数	数值
开路电压/V	2.06
OH^-浓度/(mol/L)	4
阴极孔隙率	0.56
电解液密度/(kg/m³)	1250
电解液比热容/(J/kg·K)	4182
电解液动力黏性系数/(kg/(m·s))	0.0025
压力/Pa	101325
运行温度/℃	80

图3 实验系统原理图

Fig.3 Schematic diagram of the experimental system

图4 模型可靠性

Fig.4 Model validation

图5 不同流量下的电池放电电压随时间变化情况(500 mA/cm2)

Fig.5 Changes of battery discharge voltage with time at different flow rates (500 mA/cm2)

图6 不同流量下的EE、Wpump、EU、EM分布情况(500 mA/cm2)

Fig.6 Distribution of EE, Wpump, EU and EM under different flow rates (500 mA/cm2)

图7 不同流量下的极板间反应区电液速度、离子浓度分布云图

Fig.7 Distribution of electro-hydraulic velocity and ion concentration in the reaction zone between plates at different flow rates

图8 不同流量下的近进口2 mm处速度分布情况(500 mA/cm2)

Fig.8 Velocity distribution near the inlet 2 mm under different flow rates (500 mA/cm2)

图9 不同电流密度下的恒电流放电情况

Fig.9 Constant current discharge at different current densities

图10 不同电密下的电池放电电压、EW、EE、放电时间分布情况

Fig.10 Distribution of battery discharge voltage, EW, EE and discharge time under different current densities

图11 不同电流密度下的极板间反应区离子浓度分布云图

Fig.11 Cloud map of ion concentration distribution in the reaction zone between plates under different current densities

表3 综合评价结果

Table 3 Comprehensive evaluation results

评价指标	权重系数	方案	综合评价值
功率密度	0.3767	250~100	0.659
能量密度	0.2225	250~200	0.680
电解液利用率	0.2004	250~300	0.731
有效放电容量	0.2004	250~400	0.751
—	—	250~500	0.785
—	—	250~600	0.808
—	—	250~700	0.770
—	—	250~800	0.807
—	—	250~900	0.702
—	—	250~1000	0.409

图12 不同流量与电流密度下EEint的分布情况

Fig.12 EEint distribution under different flow and current densities

参考文献 30

[1]	Arnold S, Wang L, Presser V. Dual-use of seawater batteries for energy storage and water desalination[J]. Small, 2022, 18(43): 2107913.
[2]	Chen J L, Sun L, Wang K, et al. Research and applications of rechargeable seawater battery[J]. Journal of Energy Storage, 2024, 76: 109659.
[3]	Zhang D H, Liu X, Li H H, et al. Challenges and strategies for high-energy aqueous electrolyte rechargeable batteries[J]. Angewandte Chemie International Edition, 2021, 60(2): 598-616.
[4]	Zhou L M, Liu L J, Hao Z M, et al. Opportunities and challenges for aqueous metal-proton batteries[J]. Matter, 2021, 4(4): 1252-1273.
[5]	Tian H J, Li Z, Feng G X, et al. Stable, high-performance, dendrite-free, seawater-based aqueous batteries[J]. Nature Communications, 2021, 12(1): 237.
[6]	Khezri R, Motlagh S R, Etesami M, et al. Balancing current density and electrolyte flow for improved zinc-air battery cyclability[J]. Applied Energy, 2024, 376: 124239.
[7]	Trudgeon D P, Loh A, Ullah H, et al. The influence of zinc electrode substrate, electrolyte flow rate and current density on zinc-nickel flow cell performance[J]. Electrochimica Acta, 2021, 373: 137890.
[8]	Naybour R D. The effect of electrolyte flow on the morphology of zinc electrodeposited from aqueous alkaline solution containing zincate ions[J]. Journal of the Electrochemical Society, 1969, 116(4): 520.
[9]	Despic A R, Diggle J, Bockris J O. Mechanism of the formation of zinc dendrites[J]. Journal of the Electrochemical Society, 1968, 115(5): 507.
[10]	Diggle J W, Despic A R, O'M Bockris J. The mechanism of the dendritic electrocrystallization of zinc[J]. Journal of the Electrochemical Society, 1969, 116(11): 1503.
[11]	Khazaeli A, Vatani A, Tahouni N, et al. Numerical investigation and thermodynamic analysis of the effect of electrolyte flow rate on performance of all vanadium redox flow batteries[J]. Journal of Power Sources, 2015, 293: 599-612.
[12]	Abdelghani-Idrissi S, Dubouis N, Grimaud A, et al. Effect of electrolyte flow on a gas evolution electrode[J]. Scientific Reports, 2021, 11: 4677.
[13]	Maruthi Prasanna M, Jayanti S. Effect of electrolyte circulation rate in flow-through mode on the performance of vanadium redox flow battery[J]. Journal of Power Sources, 2023, 582: 233536.
[14]	Ito Y, Nyce M, Plivelich R, et al. Zinc morphology in zinc-nickel flow assisted batteries and impact on performance[J]. Journal of Power Sources, 2011, 196(4): 2340-2345.
[15]	Wang T, Fu J H, Zheng M L, et al. Dynamic control strategy for the electrolyte flow rate of vanadium redox flow batteries[J]. Applied Energy, 2018, 227: 613-623.
[16]	Wang R Y, Kirk D W, Zhang G X. Effects of deposition conditions on the morphology of zinc deposits from alkaline zincate solutions[J]. Journal of the Electrochemical Society, 2006, 153(5): C357.
[17]	Sharifi B, Mojtahedi M, Goodarzi M, et al. Effect of alkaline electrolysis conditions on current efficiency and morphology of zinc powder[J]. Hydrometallurgy, 2009, 99(1/2): 72-76.
[18]	Dam A P, Franz T, Papakonstantinou G, et al. Catalyst dissolution in PEM water electrolysis: influence of time, current density and iridium ion transport in single-pass and recirculation water flow modes[J]. Applied Catalysis B: Environment and Energy, 2025, 365: 124946.
[19]	Zarei-Jelyani M, Loghavi M M, Babaiee M, et al. The significance of charge and discharge current densities in the performance of vanadium redox flow battery[J]. Electrochimica Acta, 2023, 443: 141922.
[20]	Pismenskaya N, Gorobchenko A, Solonchenko K, et al. Effect of current density on anion-exchange membrane scaling during electrodialysis of phosphate-containing solution: experimental study and predictive simulation[J]. Desalination, 2025, 600: 118487.
[21]	Qiu C S, He G, Shi W K, et al. The polarization characteristics of lithium-ion batteries under cyclic charge and discharge[J]. Journal of Solid State Electrochemistry, 2019, 23(6): 1887-1902.
[22]	Dong N, Zhang F L, Pan H L. Towards the practical application of Zn metal anodes for mild aqueous rechargeable Zn batteries[J]. Chemical Science, 2022, 13(28): 8243-8252.
[23]	Chen P Q, Zheng Q. Investigation on flow field optimization of seawater activated battery based on flow channel structure design[J]. Journal of Energy Storage, 2024, 84: 110798.
[24]	Sun J, Jiang H R, Zhang B W, et al. Towards uniform distributions of reactants via the aligned electrode design for vanadium redox flow batteries[J]. Applied Energy, 2020, 259: 114198.
[25]	Zhu S, Pelton R H, Collver K. Mechanistic modelling of fluid permeation through compressible fiber beds[J]. Chemical Engineering Science, 1995, 50(22): 3557-3572.
[26]	Newman J, Balsara N P. Electrochemical Systems[M]. Hoboken: John Wiley & Sons, Inc., 2021.
[27]	Tjaden B, Cooper S J, Brett D J, et al. On the origin and application of the Bruggeman correlation for analysing transport phenomena in electrochemical systems[J]. Current Opinion in Chemical Engineering, 2016, 12: 44-51.
[28]	Torabi F, Aliakbar A. A single-domain formulation for modeling and simulation of zinc-silver oxide batteries[J]. Journal of the Electrochemical Society, 2012, 159(12): A1986-A1992.
[29]	He X H, Li Z, Wang Y K, et al. A high-purity AgO cathode active material for high-performance aqueous AgO-Al batteries[J]. Journal of Power Sources, 2022, 551: 232151.
[30]	Chen P Q, Xiong C H, Zheng Q, et al. Numerical simulation and experimental investigation on the optimization of flow-guided structures for high-performance aqueous AgO-Al batteries[J]. International Journal of Heat and Mass Transfer, 2024, 235: 126167.