重构全钒液流电池碳毡力学仿真及孔尺度模拟
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TM911.3

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国家重点研发计划资助项目(2017YFB0102702);国家留学基金委CSC资助(201906950062);中央高校基本科研业务费资助(2019-YB-017)。


Solid mechanical simulation and pore-scale modelling of reconstructed carbon felt for vanadium redox flow battery
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    摘要:

    为探究全钒液流电池(VRFB)碳毡微观尺度下承受压力的位移变形并量化其对传输特性的影响,应用X射线断层扫描(XCT)微观重构技术、有限元方法(FEM)和孔尺度模拟技术(PSM),考虑碳纤维间受压缩的接触摩擦及挤压弯曲,重构碳纤维微观结构,研究了碳纤维不同压缩比3D(X,YZ方向)位移分布,并量化位移变形对微结构传输特性的影响。结果表明:随着压缩比增大到30%,Z方向位移变化最为明显,计算域A位移变化为:-59~+5 μm,计算域B位移变化为:-145~+16 μm,钒离子XY方向扩散系数减小15.4%,Z方向扩散系数减小24.2%,XY方向电导率升高112.5%,Z方向电导率增大113.3%,模拟结果与实验结果趋势较吻合,可以较好模拟预测碳毡电导率计算域尺寸为:X/Y=300~400 μm,Z=200~400 μm。

    Abstract:

    X-ray computed tomography (XCT) reconstruction technique, finite element method (FEM)and pore scale modelling (PSM) were employed to investigate the displacement distribution of vanadium redox flow battery (VRFB) carbon felt and its effects on the transport properties under compression at pore scale. With contact friction, and extrusion bending between carbon fibers taken into consideration, the microstructure of a carbon felt was reconstructed by XCT first, then the 3D (X, Y and Z direction) displacement distribution of the microstructure with different compression ratio (CR) was investigated, and the relationship between the displacement and transport properties was quantified. The results show that the carbon-fiber displacement in the Z direction (through plane) under compression is more noticeable. As CR is increased to 30%, the displacement change in Z of domains A and B are -59~+5 μm and -145~+16 μm, respectively. The diffusion coefficient of the vanadium ion in XY direction is decreased by 15.4%, and in Z direction by 24.2%.The conductivity in XY direction is increased by 112.5%, and in Z direction by 113.3%. The simulation results are in good agreement with the experimental data, and the suggested domain size that can better simulate and predict the carbon felt conductivity is: X/Y=300~400 μm, and Z=200~400 μm.

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隋邦傑,Roswitha Zeis,冷文亮,段康俊,朱礼军,罗马吉,肖柳胜.重构全钒液流电池碳毡力学仿真及孔尺度模拟[J].重庆大学学报,2020,43(8):1-10.

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  • 收稿日期:2020-03-01
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  • 在线发布日期: 2020-08-25
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