Facile Controlled Synthesis of Spinel LiMn2O4 Porous Microspheres as Cathode Material for Lithium Ion Batteries

Abstract

Although the electrochemical properties of porous LiMn 2 O 4 microspheres are usually improved compared to those of irregular LiMn 2 O 4 particles, the effects of the different synthesis conditions on the preparation of the porous LiMn 2 O 4 microspheres are rarely discussed in detail. In the present work, porous LiMn 2 O 4 microspheres were successfully synthesized by using molten LiOH and porous Mn 2 O 3 spheres as a template. Multiple factors were considered in the preparation process, including reagent concentration, pH, adding mode, heating time, etc. The morphology of the MnCO 3 template was crucial for the preparation of porous LiMn 2 O 4 microspheres and it was mainly affected by the concentration of reactants and the pH value of the solution during the precipitation process. During the lithiation of Mn 2 O 3 microspheres, the heating temperature and the ratio between Mn 2 O 3 and lithium salt were the most significant variables in terms of control over the morphology and purity of the LiMn 2 O 4 microspheres. Furthermore, we demonstrated that the porous LiMn 2 O 4 microspheres presented better rate capability and cyclability compared to commercial LiMn 2 O 4 powder as cathode materials for lithium-ion batteries (LIBs). This study not only highlights the shape-controllable synthesis of LiMn 2 O 4 microspheres as promising cathode materials, but also provides some useful guidance for the synthesis of porous LiMn 2 O 4 microspheres and other LIB' electrode materials.

High Performance Aqueous Li-Ion Flow Capacitor Realized Through Microstructure Design of Suspension Electrode

“…First, the porous LiMn 2 O 4 microspheres were prepared using coprecipitation and high temperature calcination methods, which has been described in our previous work (Hai et al, 2019). Second, 1 g LMO and 0.5 g aniline hydrochloride powder was dispersed in 60 and 40 ml deionized water by ultrasonication and vigorous stirring, respectively.…”

Preparation of Mn2O3/MIL-100(Fe) composite and its mechanism for enhancing the photocatalytic removal of rhodamine B in water

“…In recent years, manganese oxides have attracted more attention due to their practical application in many elds of study such as photocatalysis, uorescence, gas sensors, electrochemical lms, and lithium batteries. Among the manganese oxides, Mn 2 O 3 is the most widely used photocatalyst under visible light, which exists in different morphologies [17][18][19] and can be prepared by different methods such as hydrothermal and precipitation. [19][20][21] Mn 2 O 3 nanomaterials were synthesized and applied as photocatalysts for environment treatment such as degradation of ciprooxacin, 21,22 decompositions of ammonium and nitrate to N 2 , 23 reduction of CO 2 , 24 and elimination of heavy metals such as As(III) and As(VI).…”

“…Among the manganese oxides, Mn 2 O 3 is the most widely used photocatalyst under visible light, which exists in different morphologies [17][18][19] and can be prepared by different methods such as hydrothermal and precipitation. [19][20][21] Mn 2 O 3 nanomaterials were synthesized and applied as photocatalysts for environment treatment such as degradation of ciprooxacin, 21,22 decompositions of ammonium and nitrate to N 2 , 23 reduction of CO 2 , 24 and elimination of heavy metals such as As(III) and As(VI). 25 MIL-100(Fe), a type of metalorganic framework, has received lots of attention due to its hollow cage structure with a large specic surface area and high pore volume.…”

One-Step Microwave Synthesis of Micro/Nanoscale LiFePO4/Graphene Cathode With High Performance for Lithium-Ion Batteries

“…Small particle size can decrease the migration distance of lithium ions from the interior to the surface and increase the diffusion rate (Lim et al, 2008;Hai et al, 2019;Li et al, 2019;Xiao et al, 2019). Various techniques, including solid-state reaction (Zheng et al, 2008), sol-gel (Zhang et al, 2011) hydrothermal (Kiyoshi et al, 2008;Chang et al, 2014), co-precipitation (Park et al, 2003;Wang et al, 2013), and microwave heating (Wang et al, 2007;Beninati et al, 2008;Guo et al, 2010), are adopted to control particle size.…”