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Title: Thermal stability in the blended lithium manganese oxide – Lithium nickel cobalt manganese oxide cathode materials: An in situ time-resolved X-Ray diffraction and mass spectroscopy study

Thermal stabilities of a series of blended LiMn 2O 4(LMO)-LiNi 1/3Co 1/3Mn 1/3O 2 (NCM) cathode materials with different weight ratios were studied by in situ time-resolved X-ray diffraction (XRD) combined with mass spectroscopy in the temperature range of 25°C-580°C under helium atmosphere. Upon heating, the electrochemically delithiated LMO changed into Mn 3O 4 phase at around 250°C. Formation of MnO with rocksalt structure started at 520°C. This observation is in contrast to the previous report for chemically delithiate LMO in air, in which a process of λ-MnO 2 transforming to β-MnO 2 was observed. Oxygen peak was not observed in all cases, presumably as a result of either consumption by the carbon or detection limit. CO 2 profile correlates well with the phase transition and indirectly suggests the oxygen release of the cathode. Introducing NCM into LMO has two effects: first, it makes the high temperature rock-salt phase formation more complicated with more peaks in CO 2 profile due to different MO (M = Ni, Mn, Co) phases; secondly, the onset temperature of CO 2 release is lowered, implying lowered oxygen release temperature. Upon heating, XRD patterns indicate the NCM part reacts first, followed by the LMO part. Thismore » confirms the better thermal stability of LMO over NCM.« less
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  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Dongguk Univ., Seoul (Korea, Republic of). Dept. of Energy and Materials Engineering
  3. Hong Kong Univ. of Science and Technology, Clear Water Bay (Hong Kong)
Publication Date:
Grant/Contract Number:
20142020103090; AC02-98CH10886
Accepted Manuscript
Journal Name:
Journal of Power Sources
Additional Journal Information:
Journal Volume: 277; Journal Issue: C; Journal ID: ISSN 0378-7753
Research Org:
Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
25 ENERGY STORAGE; national synchrotron light source
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1249902