共 57 条
Suppression of Phase Separation in LiFePO4 Nanoparticles During Battery Discharge
被引:400
作者:
Bai, Peng
[1
,3
]
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
[3] Tsinghua Univ, State Key Lab Automot Safety & Energy, Dept Automot Engn, Beijing 100084, Peoples R China
基金:
美国国家科学基金会;
关键词:
Li-ion battery;
LiFePO4;
phase-field model;
Butler-Volmer equation;
spinodal decomposition;
intercalation waves;
RECHARGEABLE LITHIUM BATTERIES;
TRANSFORMATION ELECTRODES;
POSITIVE-ELECTRODE;
STORAGE ELECTRODES;
PHOSPHO-OLIVINES;
PARTICLE-SIZE;
MODEL;
STRAIN;
ENERGY;
TEMPERATURE;
D O I:
10.1021/nl202764f
中图分类号:
O6 [化学];
学科分类号:
0703 ;
摘要:
Using a novel electrochemical phase-field model, we question the common belief that LiXFePO4 nanoparticles always separate into Li-rich and Li-poor phases during battery discharge. For small currents, spinodal decomposition or nucleation leads to moving phase boundaries. Above a critical current density (in the Tafel regime), the spinodal disappears, and particles fill homogeneously, which may explain the superior rate capability and long cycle life of nano-LiFePO4 cathodes.
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页码:4890 / 4896
页数:7
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