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.
引用
收藏
页码:4890 / 4896
页数:7
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