Structural Changes and Thermal Stability of Charged LiNi1/3Co1/3Mn1/3O2 Cathode Material for Li-ion Batteries Studied by Time-Resolved XRD

Journal Article · Thu Jan 01 04:00:00 EST 2009 · Journal of Power Sources

DOI:https://doi.org/10.1016/j.jpowsour.2008.10.130· OSTI ID:980514

Nam, K; Yoon, W; Yang, X

Structural changes and their relationship with thermal stability of charged Li0.33Ni1/3Co1/3Mn1/3O2 cathode samples have been studied using time-resolved X-ray diffraction (TR-XRD) in a wide temperature from 25 to 600 C with and without the presence of electrolyte in comparison with Li0.27Ni0.8Co0.15Al0.05O2 cathodes. Unique phase transition behavior during heating is found for the Li0.33Ni1/3Co1/3Mn1/3O2 cathode samples: when no electrolyte is present, the initial layered structure changes first to a LiM2O4-type spinel, and then to a M3O4-type spinel and remains in this structure up to 600 C. For the Li0.33Ni1/3Co1/3Mn1/3O2 cathode sample with electrolyte, additional phase transition from the M3O4-type spinel to the MO-type rock salt phase takes place from about 400 to 441 C together with the formation of metallic phase at about 460 C. The major difference between this type of phase transitions and that for Li0.27Ni0.8Co0.15Al0.05O2 in the presence of electrolyte is the delayed phase transition from the spinel-type to the rock salt-type phase by stretching the temperature range of spinel phases from about 20 to 140 C. This unique behavior is considered as the key factor of the better thermal stability of the Li1-xNi1/3Co1/3Mn1/3O2 cathode materials.

• Research Organization: Brookhaven National Laboratory (BNL) National Synchrotron Light Source
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 980514
• Report Number(s): BNL--93432-2010-JA
• Journal Information: Journal of Power Sources, Journal Name: Journal of Power Sources Vol. 189; ISSN JPSODZ; ISSN 0378-7753
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
BEHAVIOR
CATHODES
ELECTROLYTES
HEATING
MATERIALS
ROCKS
SALT DEPOSITS
SPINELS
STABILITY
TEMPERATURE RANGE
X-RAY DIFFRACTION
national synchrotron light source