Phase-Transformation Wave Dynamics in LiFePO4

Phase-Transformation Wave Dynamics in LiFePO4
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LiFePO4 中的相变波动力学

DOI:
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发表时间:
2008
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影响因子:
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通讯作者:
M. Bazant
M. Bazant
中科院分区:
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文献类型:
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作者:
Damian N. Burch;G. Singh;G. Ceder;M. Bazant

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最近提出了一个通用的连续介质模型来描述离子在可充电电池电极材料[1]单晶中的嵌入动力学。当应用于强相分离、高度各向异性的材料,如LiFePO4时,可以预测晶体的锂化和非锂化部分之间的相变波。在本文中,我们扩展了波动动力学的分析,并通过这些波与材料缺陷的相互作用描述了电流容量衰减的新机制。
A general continuum model has recently been proposed for the dynamics of ion intercalation in a single crystal of rechargeable-battery electrode materials [1]. When applied to strongly phase-separating, highly anisotropic materials such as LiFePO4, phase-transformation waves are predicted between the lithiated and unlithiated portions of a crystal. In this paper, we extend the analysis of the wave dynamics, and we describe a new mechanism for current capacity fade through the interactions of these waves with defects in the material.