Title

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

RIS ID

42831

Publication Details

Sharma, N., Reddy, m. v., Du, G., Adams, S., Chowdari, B. VR., Guo, Z. and Peterson, V. K. (2011). Time-dependent in-situ neutron diffraction investigation of a Li(Co0.16Mn1.84)O4 cathode. The Journal of Physical Chemistry Part C: Nanomaterials and Interfaces, 115 (43), 21473-21480.

Abstract

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.

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Link to publisher version (DOI)

http://dx.doi.org/10.1021/jp2026237