Thermal Stability of Lithium Nickel Oxide Derivatives. Part I: LixNi1.02O2 and LixNi0.89Al0.16O2 (x = 0.50 and 0.30)

• Published in: Chemistry of materials Vol. 15; no. 23; pp. 4476 - 4483
• Main Authors: GUILMARD, M., CROGUENNEC, L., DENUX, D., DELMAS, C.
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 18.11.2003
• Subjects: Chemical Sciences; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Material chemistry; Materials science; Materials testing; Physics; Thermal analysis, differential thermal analysis (DTA), differential thermogravimetric analysis; Nickel oxides; Temperature dependence; Lithium oxides; Inorganic compounds; Phase transformations; Transition element compounds; Thermogravimetry; Mass spectroscopy; XRD; Experimental study; Thermal stability; Aluminium oxides; Solid solution; Lithium nickel oxide
• ISSN: 0897-4756; 1520-5002
• DOI: 10.1021/cm030059f

The thermal degradation mechanism of LixNi1.02O2 and LixNi0.89Al0.16O2 (x = 0.50 and 0.30) was studied by in situ X-ray diffraction correlated with thermal gravimetric analysis coupled with mass spectrometry. The degradation mechanism appears to be the same for both types of samples. It consists of two steps: the first step, corresponding to the lamellar to pseudo-spinel transformation, is accompanied by an oxygen loss only for compounds with an initial (Li + M)/O ratio (M = Ni, Al) smaller than 3/4...