Electrochemical and Thermal Comparisons of Li[Ni0.1Co0.8Mn0.1]O2 Synthesized at Different Temperatures (900, 1000, and 1100DGC)

• Published in: Journal of the Electrochemical Society Vol. 152; no. 1; pp. A19 - A22
• Main Authors: Jiang, J, Buhrmester, T, Eberman, K W, Krause, L J, Dahn, J R
• Format: Journal Article
• Language: English
• Published: 01.01.2005
• ISSN: 0013-4651
• DOI: 10.1149/1.1829432

The electrochemical properties of Li[Ni0.1Co0.5Mn0.1]O2 synthesized at 900, 1000, and 1100DGC were compared. Li[Ni0.1Co0.8Mn0.1]O2 prepared at 900 has the largest reversible capacity of 170 mAh/g (charged to 4.4 V vs. Li metal) and retains 80% of its capacity after 200 cycles at C/4 in Li test cells. Furthermore, Li[Ni0.1Co0.8Mn0.1]O2 (900DGC) charged to either 4.2 or 4.4 V vs. Li metal shows less reactivity with ethylene carbonate (EC)/diethyl carbonate (DEC) solvent or with 1 M LiPF6 EC/DEC than Li[Ni0.1Co0.8Mn0.1]O2 samples prepared at either 1000 or 1100DGC as measured by accelerating rate calorimetry. The onset temperature for the reaction of 100 mg Li[Ni0.1Co0.8Mn01]O2 (900DGC) charged to 4.2 V with 100 mg of 1 M LiPF6 EC/DEC heated initially to 110DGC is approximately 210DGC, which is about 40DGC higher than the onset temperature of the reaction between LiCoO2 charged to 4.2 V and LiPF6 EC/DEC electrolyte under the same conditions.