Capturing metastable structures during high-rate cycling of LiFePO₄ nanoparticle electrodes. Liu, H., Strobridge, F., C., Borkiewicz, O., J., Wiaderek, K., M., Chapman, K., W., Chupas, P., J., & Grey, C., P. Science (New York, N.Y.), 344:1252817, 6, 2014.
Capturing metastable structures during high-rate cycling of LiFePO₄ nanoparticle electrodes. [link]Website  doi  abstract   bibtex   1 download  
The absence of a phase transformation involving substantial structural rearrangements and large volume changes is generally considered to be a key characteristic underpinning the high-rate capability of any battery electrode material. In apparent contradiction, nanoparticulate LiFePO4, a commercially important cathode material, displays exceptionally high rates, whereas its lithium-composition phase diagram indicates that it should react via a kinetically limited, two-phase nucleation and growth process. Knowledge concerning the equilibrium phases is therefore insufficient, and direct investigation of the dynamic process is required. Using time-resolved in situ x-ray powder diffraction, we reveal the existence of a continuous metastable solid solution phase during rapid lithium extraction and insertion. This nonequilibrium facile phase transformation route provides a mechanism for realizing high-rate capability of electrode materials that operate via two-phase reactions.
@article{
 title = {Capturing metastable structures during high-rate cycling of LiFePO₄ nanoparticle electrodes.},
 type = {article},
 year = {2014},
 pages = {1252817},
 volume = {344},
 websites = {http://www.ncbi.nlm.nih.gov/pubmed/24970091},
 month = {6},
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 abstract = {The absence of a phase transformation involving substantial structural rearrangements and large volume changes is generally considered to be a key characteristic underpinning the high-rate capability of any battery electrode material. In apparent contradiction, nanoparticulate LiFePO4, a commercially important cathode material, displays exceptionally high rates, whereas its lithium-composition phase diagram indicates that it should react via a kinetically limited, two-phase nucleation and growth process. Knowledge concerning the equilibrium phases is therefore insufficient, and direct investigation of the dynamic process is required. Using time-resolved in situ x-ray powder diffraction, we reveal the existence of a continuous metastable solid solution phase during rapid lithium extraction and insertion. This nonequilibrium facile phase transformation route provides a mechanism for realizing high-rate capability of electrode materials that operate via two-phase reactions.},
 bibtype = {article},
 author = {Liu, Hao and Strobridge, Fiona C and Borkiewicz, Olaf J and Wiaderek, Kamila M and Chapman, Karena W and Chupas, Peter J and Grey, Clare P},
 doi = {10.1126/science.1252817},
 journal = {Science (New York, N.Y.)}
}

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