Electrodeposition Of Carbon Materials In Molten Salt As Anode Materials For Lithium Ion Batteries

In this paper,304stainless steel mesh subsrtate was coated with carbon materials based on the electrochemical reduction of CO32-in a fused eutectic mixture of KCl-LiCl at500℃. Oxidation and electrodeoxidation pretreatment technology of substrate was used to enhance the adhesion strength between carbon materials and substrate. Surface morphology of carbon materials under different oxidation and electrodeoxidation conditions were characterized by SEM. X-ray diffraction, energy-dispersive X-ray spectra and Raman spectrum were used to analyze the phase and chemical composition of carbon materials systematically. Carbon/stainless steel mesh composite materials were used as anode for lithium ion battery. This kind of composite materials were applied as anode without any conductive agent and binder. The electrochemical performance of materials and the cycling performance of LIB were investigated by cyclic voltammetry, electrochemical impedance spectroscopy and land battery test system.The presence of graphite and amorphous carbon was confirmd by X-ray diffraction measurements. The C-C bond of carbon materials were in the sp2hybridisation state. Raman spectrum has revealed that carbon materials were consist of carbon ring or long chain structures and the structure of the carbon existing in hexagon ring. The downward and upward shift of peak D and G is a sensitive indication that carbon is changing from one disorder state to another. SEM images show that carbon materials have the particle size within1-3μm and the coating thickness within2-3μm. In addition, the adhesion strength between carbon materials and substrate was improved due to the oxidation and electrodeoxidation pretreatment technology On the contrary, the untreated substrate is not easy to be deposited by carbon atom.Carbon/stainless steel mesh composite material as anode for lithium ion battery shows good capacity and cycling performance and displays high coulombic efficiency. After activation, the coulombic efficiency of each charge/discharge cycle can be more than 97%.After30cycles of charge/discharge, the reserve capacity of LIB is over350mAhg-1. The battery has a large initial discharge capacity and no apparent charge-discharge plateau. It is benefit for detection of the remaining capacity. There is no any conductive agent and binder in the composite material for LIB anode. Thereby, the electrochemical performance of electrode is not affected by the influence of additives. The battery behavior reflects the properties of carbon materials itself completely.