Abstract
Electrochemical performance of natural graphite as anode material in the Li-ion battery has been modified by coating this particle with amorphous carbon through two step synthesis process. Citric acid as the amorphous carbon source was mixed with natural graphite (NG) in the ethanol solvent at 80 °C using magnetic stirrer. In the first step, the mixture of NG and CA were dried at 350 °C for 5 hours under argon atmosphere to evaporate the solvent. This dried mixture was then sintered at different temperature i.e. 500 °C (labeled CNG500), 600 °C (CNG600) and 700 °C (CNG700) under argon atmosphere to form amorphous carbon layer on the surface of NG. The crystal structure and morphology of the particles were characterized by using XRD, SEM and TEM. Electrochemical performance and charge-discharge of amorphous carbon-coated graphite has been evaluated by cyclic voltammetry and WBCS 3000, respectively. Cyclic voltammogram showed the working potential and redox reaction peak of the sample. Charge-discharge data was obtained to determine the specific capacity of the sample at 0.1C.
Highlights
Li-ion battery has been used as energy storage for several applications such as mobile phone, notebook computer, gadget, cameras [1] and for electric vehicles and hybrid electric vehicles [2] due to its high performance i.e. the energy density, safety, rate capability, low cost, sustainability [2], and cycle life [3]
The rate performance on the anode material of Li-ion battery depends on stability of the surface electrolyte interface (SEI) layer formed during charge-discharge cycle
Physical properties of material The samples are heat treated at several temperatures 500, 600 and 700 °C for five hours in argon atmosphere to investigate the effect of heat treatment temperature on the electrochemical performance
Summary
Li-ion battery has been used as energy storage for several applications such as mobile phone, notebook computer, gadget, cameras [1] and for electric vehicles and hybrid electric vehicles [2] due to its high performance i.e. the energy density, safety, rate capability, low cost, sustainability [2], and cycle life [3]. The rate performance on the anode material of Li-ion battery depends on stability of the surface electrolyte interface (SEI) layer formed during charge-discharge cycle. Surface modification on the graphite based anode materials have been reported by many researcher. This modification can achieve the high rate performance of the Liion battery. Surface modification through by coating graphite with amorphous carbon was reported by many researchers for enhancing the battery performance. CTP derived amorphous carbon coating could effectively decrease charge transfer resistance on the graphite electrode-electrolyte interface. The temperature of heat treatment is varied and its effect on the electrochemical performance of the graphite is studied
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