Metal–oleate complex-derived bimetallic oxides nanoparticles encapsulated in 3D graphene networks as anodes for efficient lithium storage with pseudocapacitance

• Main Authors: Gu, Hongwei, Cao, Yingying, Geng, Kaiming, Geng, Hongbo, Ang, Huixiang, Pei, Jie, Liu, Yayuan, Cao, Xueqin, Zheng, Junwei
• Other Authors: School of Chemical and Biomedical Engineering
• Format: Article
• Language: English
• Published: 2019
• Subjects: DRNTU::Engineering::Chemical engineering; Bimetallic Oxides Nanoparticles; Metal–oleate Complex
• Online Access: https://hdl.handle.net/10356/105482; http://hdl.handle.net/10220/47821
• Institution: Nanyang Technological University

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.