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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

Journal Article · · Journal of Power Sources
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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)
+ Show Author Affiliations

Thermal stabilities of a series of blended LiMn2O4(LMO)-LiNi1/3Co1/3Mn1/3O2 (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 Mn3O4 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-MnO2 transforming to β-MnO2 was observed. Oxygen peak was not observed in all cases, presumably as a result of either consumption by the carbon or detection limit. CO2 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 CO2 profile due to different MO (M = Ni, Mn, Co) phases; secondly, the onset temperature of CO2 release is lowered, implying lowered oxygen release temperature. Upon heating, XRD patterns indicate the NCM part reacts first, followed by the LMO part. This confirms the better thermal stability of LMO over NCM.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
20142020103090
OSTI ID:
1165964
Alternate ID(s):
OSTI ID: 1249902
Report Number(s):
BNL-107203-2014-JA; BNL-107203-2014-JAAM; VT1201000-05450-1005554
Journal Information:
Journal of Power Sources, Vol. 277, Issue C; ISSN 0378-7753
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 26 works
Citation information provided by
Web of Science

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Cited By (6)

Thermal safety studies of high energy density lithium‐ion batteries under different states of charge journal December 2019
Enhanced Electrochemical Properties of LiNi 0.8 Co 0.1 Mn 0.1 O 2 at Elevated Temperature by Simultaneous Structure and Interface Regulating journal January 2019
Polyhedral perspectives on the capacity limit of cathode compounds for lithium-ion batteries: a case study for Li 6 CoO 4 journal January 2018
Anti‐Oxygen Leaking LiCoO 2 journal April 2019
In situ Synchrotron X-ray Techniques for Structural Investigation of Electrode Materials for Li-ion Battery journal December 2019
Synergetic effects of LiNi1/3Co1/3Mn1/3O2–LiMn2O4 blended materials on lithium ionic transport for power performance journal July 2018

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