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http://dx.doi.org/10.14478/ace.2014.1094

Electrochemical Characteristics of Lithium Ion Battery Anode Materials of Graphite/SiO2  

Ko, Hyoung Shin (POSCO ESM)
Choi, Jeong Eun (POSCO ESM)
Lee, Jong Dae (Department of Chemical Engineering, Chungbuk National University)
Publication Information
Applied Chemistry for Engineering / v.25, no.6, 2014 , pp. 592-597 More about this Journal
Abstract
The graphite/$SiO_2$ composites as anode materials for lithium-ion batteries were prepared by sol-gel method to improve the graphite's electrochemical characteristics. The prepared graphite/$SiO_2$ composites were analysed by XRD, FE-SEM and EDX. The graphite surface modified by silicon dioxide showed several advantages to stabilize SEI layer. The electrochemical characteristics were investigated for lithium ion battery using graphite/$SiO_2$ as the working electrode and Li metal as the counter electrode. Electrochemical behaviors using organic electrolytes ($LiPF_6$, EC/DMC) were characterized by charge/discharge, cycle, cyclic voltammetry and impedance tests. The lithium ion battery using graphite/$SiO_2$ electrodes had better capacity than that of using graphite electrodes and was able to deliver a discharge capacity with 475 mAh/g at a rate of 0.1 C. Also, the capacity retention ratio of the modified graphite reaches 99% at a rate of 0.8 C.
Keywords
Lithium ion battery; Anode material; Graphite; Silicon Oxide; Surface modification;
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