Metal–Oleate Complex-Derived Bimetallic Oxides Nanoparticles Encapsulated in 3D Graphene Networks as Anodes for Efficient Lithium Storage with Pseudocapacitance

Abstract

HIGHLIGHTS• Bimetallic oxides nanoparticles derived from metal-oleate complexes embedded in 3D graphene networks were fabricated by a facile and rational design approach.• The unique porous architecture promotes charge transfer so as to enhance the reversible capacity.• The synergetic effect between the 0D nanoparticles and 3D graphene networks plays an essential role in the superb electrochemical performance. ABSTRACTIn this manuscript, we have demonstrated the delicate design and synthesis of bimetallic oxides nanoparticles derived from metal-oleate complex embedded in 3D graphene networks (MnO/CoMn 2 O 4 ⊂ GN), as an anode material for lithium ion batteries. The novel synthesis of the MnO/CoMn 2 O 4 ⊂ GN consists of thermal decomposition of metal-oleate complex containing cobalt and manganese metals and oleate ligand, forming bimetallic oxides nanoparticles, followed by a selfassembly route with reduced graphene oxides. The MnO/CoMn 2 O 4 ⊂ GN composite, with a unique architecture of bimetallic oxides nanoparticles encapsulated in 3D graphene networks, rationally integrates several benefits including shortening the diffusion path of Li + ions, improving electrical conductivity and mitigating volume variation during cycling. Studies show that the electrochemical reaction processes of MnO/CoMn 2 O 4 ⊂ GN electrodes are dominated by the pseudocapacitive behavior, leading to fast Li + charge/discharge reactions. As a result, the MnO/CoMn 2 O 4 ⊂ GN manifests high initial specific capacity, stable cycling performance, and excellent rate capability.

Porous Co2VO4 Nanodisk as a High-Energy and Fast-Charging Anode for Lithium-Ion Batteries

“…Lithium-ion batteries (LIBs) are widely used for portable electronic devices in the past decade because of their high-energy density, long cycling life, low self-discharge, the absence of memory effect, and low environmental impact [ 1 , 2 ]. In recent years, LIBs have aroused extensive attention as the power source for electric vehicles (EVs).…”

Enhanced Lithium Storage Property Boosted by Hierarchical Hollow-Structure WSe2 Nanosheets/N, P-Codoped Carbon Nanocomposites

“…The b value of 0.5 represents the diffusion-controlled behavior (battery-type) and the b value of 1.0 suggests the surface-controlled behavior (capacitor-type). 47 Figure 4g shows the linear fitting of b values for the WSe 2 /NPCs, the calculated b values are 0.85 and 0.84 for the two cathodic peaks, and the calculated b values are 1.03 and 0.95 for the two anodic peaks, which confirms the high contribution of surface capacitive behavior throughout the entire voltage range. At a certain potential, the percentage of capacitive-controlled contribution to the total charge storage was distinguished quantitatively via further analyzing the relationship between the scan rate and current response.…”

“…The electrochemical behavior can be distinguished via fitting the b value. The b value of 0.5 represents the diffusion-controlled behavior (battery-type) and the b value of 1.0 suggests the surface-controlled behavior (capacitor-type) Figure g shows the linear fitting of b values for the WSe 2 /NPCs, the calculated b values are 0.85 and 0.84 for the two cathodic peaks, and the calculated b values are 1.03 and 0.95 for the two anodic peaks, which confirms the high contribution of surface capacitive behavior throughout the entire voltage range.…”

Heterostructured SnSe2-CoSe2 microspheres embedded in reduced graphene oxides as an anode material with high sodium storage

“…These composites, especially for bimetallic oxides, have been widely studied in LIBs. Excellent long-term cycling performance can be obtained by designing novel morphology [29][30][31]. However, most of bimetallic oxides (such as ZnCo 2 O 4 , Sb 2 MoO 6 ) exhibit low electrochemical activity as anodes for SIBs [32,33].…”