Time-dependent in-situ neutron diffraction investigation of a Li(Co0.16Mn1.84)O4 cathode

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American Chemical Society
Real-time in-situ neutron diffraction data reveal for the first time that the Li(Co0.16Mn1.84)O4 cathode undergoes current-free discharge. We find that current-free discharge occurs in a partially charged Li(Co0.16Mn1.84)O4 cathode during its first charge cycle over a period of 11 h resulting in a 44(2)% expansion of the crystal lattice. The rate of change in the lattice parameter during the current-free discharge process is half the rate and more linear than for an applied-current discharge of ?0.5 mA. The origins of current-free discharge are discussed along with the implications of nonequilibrium relaxation processes in in-situ neutron and X-ray diffraction studies. We show that the lattice does not return to the predischarge values after either current-applied or current-free discharge, indicating a limited ability for Li reinsertion (capacity loss) in partially charged Li(Co0.16Mn1.84)O4 batteries. © 2011, American Chemical Society
Neutron diffraction, Cathodes, X-ray diffraction, Lattice parameters, Radioisotope batteries, Diffractometers
Sharma, N., Reddy, M. V., Du, G.D., Adams, S., Chowdari, B. V .R., Guo, Z. P., & Peterson, V. K. (2011). Time-dependent in-situ neutron diffraction investigation of a Li(Co0.16Mn1.84)O4 cathode. Journal of Physical Chemistry C, 115(43), 21473-21480. doi:10.1021/jp2026237