Nano-Micro Letters

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

Yingying Cao1, #, Kaiming Geng1, #, Hongbo Geng2, *, Huixiang Ang3, Jie Pei1, Yayuan Liu1, Xueqin Cao1, Junwei Zheng4, Hongwei Gu1, *

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Nano-Micro Lett. (2019) 11: 15

First Online: 25 February 2019 (Article)

DOI:10.1007/s40820-019-0247-3

*Corresponding author. E-mail: hongwei@suda.edu.cn (Hongwei Gu); hbgeng@gdut.edu.cn (Hongbo Geng)

 

Abstract

 


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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/CoMn2O4⊂GN), as an anode material for lithium-ion batteries. The novel synthesis of the MnO/CoMn2O4⊂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/CoMn2O4⊂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/CoMn2O4⊂GN electrodes are dominated by the pseudocapacitive behavior, leading to fast Li+ charge/discharge reactions. As a result, the MnO/CoMn2O4⊂GN manifests high initial specific capacity, stable cycling performance and excellent rate capability.


 

Keywords

Metal-oleate complex; Bimetallic oxides nanoparticles; Porous architecture; 3D graphene networks; Lithium-ion batteries

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