LiFePO4电池颗粒中尺寸依赖的相形态
Size-dependent phase morphologies in LiFePO4 battery particles
摘要：
磷酸铁锂（LiFePO $_4$）是典型的两相电池材料，其复杂的锂离子嵌入模式为电化学热力学理论提供了实验基础。使用深度平均（a-b平面）相场模型的法拉第反应驱动的相干相分离，我们调和冲突的实验观察类金刚石相图案在微米级的血小板和纳米粒子的表面控制模式。弹性分析预测这种形态转变的颗粒，其a轴尺寸超过散装弹性条纹周期。我们还模拟了各种各样的非平衡模式，尺寸依赖的旋节点和电自催化控制的热力学稳定性的影响。
英文摘要：
Lithium iron phosphate (LiFePO$_4$) is the prototypical two-phase battery material, whose complex patterns of lithium ion intercalation provide a testing ground for theories of electrochemical thermodynamics. Using a depth-averaged (a-b plane) phase-field model of coherent phase separation driven by Faradaic reactions, we reconcile conflicting experimental observations of diamond-like phase patterns in micron-sized platelets and surface-controlled patterns in nanoparticles. Elastic analysis predicts this morphological transition for particles whose a-axis dimension exceeds the bulk elastic stripe period. We also simulate a rich variety of non-equilibrium patterns, influenced by size-dependent spinodal points and electro-autocatalytic control of thermodynamic stability.
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