阳极
多孔性
电极
阴极
材料科学
压缩(物理)
电池(电)
扩散
电荷守恒
多孔硅
硅
电化学
复合材料
热力学
机械
电荷(物理)
化学
光电子学
物理化学
物理
功率(物理)
量子力学
作者
Srikanth Arisetty,Niccolo P. Jimenez,Krishnan Raghunathan
标识
DOI:10.1149/1945-7111/ac9d0c
摘要
We formulated a model that describes the diffusion, volume change and mechanical compression, coupled with multi-site-multi-reaction theory of the porous electrodes, and we apply the treatment to battery cells with silicon as anode active material. Irreversible thermodynamics and conservation laws have been used to tie all the equations together. For cell lithiation (charge), changes in the porosity, cell thickness and cell electrochemical resistance due to increase in active material volume and mechanical compression are calculated. Experimental data on cell expansion is collected on pouch cells with silicon anode and NMC622 the cathode; the model compares favorably with the data. Model simulations show that during the C/5 charge cycle, particle expands by 10% and porosity of the electrode decreases by approximately 8%. The model can be exercised to evaluate the cell operating regime for meeting targets and design considerations. Simulation studies revealed the importance of compression pressure and the spring constant on cell expansion.
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