Solid-state synthesis of uniform Li2MnSiO4/C/graphene composites and their performance in lithium-ion batteries

Uniform nanospherical Li2MnSiO4/C/graphene composites have been obtained by polyethylene glycol-600 (PEG-600) assisted solid-state reaction using spherical SiO2 as precursor, and heat treatment with the mixed carbon sources (glucose, cellulose acetate and graphene oxide). The transmission electron m...

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Bibliographic Details
Published in:Journal of power sources 2014, Vol.246, p.192-197
Main Authors: Gong, Huaxu, Zhu, Yongchun, Wang, Linlin, Wei, Denghu, Liang, Jianwen, Qian, Yitai
Format: Article
Language:English
Subjects:
Applied sciences
Carbon
Direct energy conversion and energy accumulation
Discharge
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Exact sciences and technology
Graphene
Image transmission
Lithium-ion batteries
Materials
Nanostructure
Networks
Polyethylenes
Three dimensional
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Summary:Uniform nanospherical Li2MnSiO4/C/graphene composites have been obtained by polyethylene glycol-600 (PEG-600) assisted solid-state reaction using spherical SiO2 as precursor, and heat treatment with the mixed carbon sources (glucose, cellulose acetate and graphene oxide). The transmission electron microscope (TEM) images show that Li2MnSiO4 nanospheres with size of 50 nm are embedded in the three-dimensional (3D) nest-like carbon network. Electrochemical measurements reveal that the composites exhibit first discharge capacity of 215.3 mAh ga1 under 0.05 C, together with a stable discharge capacity of 175 mAh ga1 after 40 cycles. The 3D carbon network and the carbon layer (amorphous carbon and graphene) are favorable for improving the electrochemical performance.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2013.07.079