Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 115, Issue 43, Pages 21473-21480Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp2026237
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Funding
- Australian Research Council (ARC) [DP0878611]
- Ministry of Education (MOE), Singapore [WBS-R-284-000-076-112]
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Real-time in-situ neutron diffraction data reveal for the first time that the Li(Co0.16Mn1.84)O-4 cathode undergoes current-free discharge. We find that current-free discharge occurs in a partially charged Li(Co-0.16-Mn-1.84)O-4 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)O-4 batteries.
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