Stabilizing nickel-rich layered cathode materials by a high-charge cation doping strategy: zirconium-doped LiNi0.6Co0.2Mn0.2O2. Issue 41 (29th September 2016)

• Record Type: Journal Article
• Authors: Schipper, Florian; Dixit, Mudit; Kovacheva, Daniela; Talianker, Michael; Haik, Ortal; Grinblat, Judith; Erickson, Evan M.; Ghanty, Chandan; Major, Dan T.; Markovsky, Boris; Aurbach, Doron
• Is Part Of: Journal of materials chemistry. Volume 4:Issue 41(2016)
• Page Start: 16073
• Page End: 16084
• Publication Date: 2016-09-29
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c6ta06740a
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : The high charge-state dopant Zr 4+ improves the structural stability and electrochemical behavior of the lithiated transition metal oxide LiNi0.6 Co0.2 Mn0.2 O2 . Abstract : Ni-rich layered lithiated transition metal oxides Li[Ni x Co y Mn z ]O2 ( x + y + z = 1) are the most promising materials for positive electrodes for advanced Li-ion batteries. However, one of the drawbacks of these materials is their low intrinsic stability during prolonged cycling. In this work, we present lattice doping as a strategy to improve the structural stability and voltage fade on prolonged cycling of LiNi0.6 Co0.2 Mn0.2 O2 (NCM-622) doped with zirconium (+4). It was found that LiNi0.56 Zr0.04 Co0.2 Mn0.2 O2 is stable upon galvanostatic cycling, in contrast to the undoped material, which undergoes partial structural layered-to-spinel transformation during cycling. The current study provides sub-nanoscale insight into the role of Zr 4+ doping on such a transformation in Ni-rich Li[Ni x Co y Mn z ]O2 materials by adopting a combined experimental and first-principles theory approach. A possible mechanism for a Ni-mediated layered-to-spinel transformation in Ni-rich NCMs is also proposed.