3D network single-phase Ni0.9Zn0.1O as anode materials for lithium-ion batteries. (October 2016)

• Record Type: Journal Article
• Authors: Huang, Guoyong; Guo, Xueyi; Cao, Xiao; Tian, Qinghua; Sun, Hongyu
• Is Part Of: Nano energy. Volume 28(2016:Oct.)
• Page Start: 338
• Page End: 345
• Publication Date: 2016-10
• Subjects: Bi-metal-oxide -- Metal-organic precursor -- 3D network structure -- Li-ion storage mechanism -- Lithium-ion batteries; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2016.08.050
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: A novel 3D network single-phase Ni0.9 Zn0.1 O has been designed and synthesized by calcining a special metal-organic precursor (MOP) (MeO2 C3 H6, Me=Ni and Zn, the molar ratio of Ni: Zn=9:1) as the self-sacrificing template for the first time. Comparing with NiO or the mixture of NiO and ZnO, the new two-step Li-ion storage mechanism in the 3D network single−phase Ni0.9 Zn0.1 O has been discovered and verified to be: a reversible conversion reaction between Ni0.9 Zn0.1 O and Ni-Zn alloy (Ni0.9 Zn0.1 ), and a reversible Li-alloying reaction between Ni-Zn alloy and Ni0.9 Zn0.1 Li. More remarkably, due to the new mechanism, the anode material shows a low initial discharge platform around ~ 0.5 V ( vs . Li + /Li). The first discharge voltage is lower than typical transition-metal oxides, which generally have higher initial discharge plateau around 1.0 V ( vs . Li + /Li). It is shown that the novel 3D network single-phase Ni0.9 Zn0.1 O has outstanding electrochemical performances, demonstrating discharge capacities ( e. g. 1465.3 mAh g −1 at 100 mA g −1 and 1055.6 mAh g −1 at 800 mA g −1, respectively), excellent capacity retention and superior rate capability ( e. g. capacity retention ratio of 92.9% after 150 cycles at 800 mA g −1 current density). Graphical abstract: Highlights: 3D network single-phase Ni0.9 Zn0.1 O is designed and synthesized from a special metal-organic precursor. The new two-step Li-ion storage mechanism has been discovered and verified. Due to the new mechanism, the initial discharge voltage platform is only ~0.5 V, lower than typical transition-metal oxides (~1.0 V). The outstanding electrochemical performance is tested.