Room-temperature solution synthesis of ZnMn₂O₄ nanoparticles for advanced electrochemical lithium storage

Abstract

ZnMn2O4 nanoparticles were fabricated via a low-cost and ecofriendly one-step approach at room temperature. The particles exhibited excellent structure stability and superior lithium storage.

Mesoporous ZnMn2O4 Nanospheres as a Nonprecious Bifunctional Catalyst for Zn–Air Batteries

“…26 Following the ORR process, the Zn 2p spectra (Figure 8c) shows a constant separation between the 2p 3/2 and 2p 1/2 doublet without any shift in the binding energy, which indicate that Zn 2+ is inactive during the ORR. 27,28 In contrast, the Zn 2p XPS spectrum following the OER process exhibits a broad shoulders at a high binding energy of Zn 2p 3/2 and Zn 2p 1/2 peaks, which is related to Zn(OH) 2 . The relative amounts of Zn 2+ in Zn(OH) 2 and ZnMn 2 O 4 are 9.1% and 90.9%, respectively.…”

Al-doping enables high stability of single-crystalline LiNi0.7Co0.1Mn0.2O2 lithium-ion cathodes at high voltage

“…5c, d and Table S3 †) illustrate that the sample of NCM-0.2Al possesses the lower resistance value and higher D Li + (5.3278 Â 10 À11 cm 2 s À1 ) than that of NCM (4.6542 Â 10 À11 cm 2 s À1 ), showing the superior reaction kinetics. 7,[27][28][29][30][31] Meanwhile, the outstanding cycling stability of NCM-0.2Al also has been conrmed by the cross-sectional SEM images (Fig. 6b and c), which delivers unbroken crystal framework.…”

Composition and Architecture Design of Double‐Shelled Co0.85Se1−xSx@Carbon/Graphene Hollow Polyhedron with Superior Alkali (Li, Na, K)‐Ion Storage

“…As a result, the R ct of CoSeS@C/G (55.09 Ω) is smaller than that of CoSe@C/G (69.21 Ω) and CoSeS@C (123.1 Ω), indicating the CoSSe@G possess the fastest interface kinetics, i.e., the great rate property. So as to further obtain the deep insight into the diffusion process, the liner of Z ′− ω −1/2 (Figure S13, Supporting Information) is fitted to further calculate the Li‐ion diffusion coefficient ( D Li+ ) on the bases of the following equations [ 44–46 ] where R , T , A , n , F , C , σ w , and ω stand for the gas constant, Kelvin temperature, electrode area, electronic transfer number, Faraday constant, Li + concentration, Warburg factor, and angular frequency, respectively. Thus, the calculated results expound that CoSeS@C/G preforms faster lithium diffusion rate (3.8 × 10 −14 cm 2 s −1 ) than that of CoSe@C/G (2.0 × 10 −14 cm 2 s −1 ) and CoSeS@C (1.27 × 10 −14 cm 2 s −1 ), illuminating that the anion substitution and dual‐shell structure can effectively reduce the resistances and improve the diffusion kinetic.…”