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

Abstract

Abstract: In 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 self-assembly 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.[Figure not available: see fulltext.].