Impact of Dopants (Al, Mg, Mn, Co) on the Reactivity of LixNiO2 with the Electrolyte of Li-Ion Batteries. Issue 13 (1st January 2019)

• Record Type: Journal Article
• Authors: Cormier, Marc M. E.; Zhang, Ning; Liu, Aaron; Li, Hongyang; Inglis, Julie; Dahn, J. R.
• Is Part Of: Journal of the Electrochemical Society. Volume 166:Issue 13(2019)
• Page Start: A2826
• Page End: A2833
• Publication Date: 2019-01-01
• Subjects: Batteries - Lithium -- dopants -- lithium nickel oxide -- safety; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0491913jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : First-principles computation of bulk O binding energies and Bader charges revealed the importance of Li content on thermal decomposition of charged high-nickel positive electrode materials for Li-ion batteries (Lix Ni1-y My O2, 0 < x < 1, y = 0, 0.05, M = Al, Mg, Mn, Co). The impact of individual dopants on the safety of these materials was studied using thermogravimetric analysis (TGA) and accelerating rate calorimetry (ARC) at two different states of charge corresponding to materials with two different Li contents. It was found that thermal stability strongly depends on the Li content of the material and that dopants serve to increase thermal stability by reducing the amount of Li removed from the material at a given voltage. This work sheds light on an unavoidable trade-off between high capacity and thermal stability for high-nickel materials.