Size-dependent phase morphologies in LiFePO4 battery particles

被引：43
作者：
Cogswell, Daniel A. [1 ]
Bazant, Martin Z. [1 ,2 ]
机构：
[1] MIT, Dept Chem Engn, Cambridge, MA 02139 USA
[2] MIT, Dept Math, Cambridge, MA 02139 USA
来源：
ELECTROCHEMISTRY COMMUNICATIONS | 2018年 / 95卷
关键词：
Lithium iron phosphate; Two-phase equilibrium; Coherency strain; Phase-field model; Spinodal decomposition; Electro-autocatalysis; ELECTRON-MICROSCOPY; INTERCALATION; SEPARATION; RESOLUTION; KINETICS; TRANSFORMATION; SPECTROSCOPY; SUPPRESSION; TRANSITION; FRACTURE;
D O I：
10.1016/j.elecom.2018.08.015
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Lithium iron phosphate (LiFePO4) 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 with observations of surface-controlled patterns in nanoparticles. Elastic analysis predicts this morphological transition for particles whose a-axis dimension exceeds twice 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.
引用
收藏
页码：33 / 37
页数：5
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