| Summary: | The potential risk from the usage of the liquid electrolyte has brought researchers to shift into solid electrolyte. One of the currently developing solid electrolytes is an electrolyte extracted from the Lithium Bis(Oxalato)borate compound or LiBOB. This particular compound is relatively environment-friendly as it is halogen-free.
This research was conducted to determine the kinetic reaction for synthesis of LiBOB. Synthesis of LiBOB is a non-catalytic solid-solid reaction. Oxalic acid dyhidrate, lithium oxide monohydrate and boric acid were mixed with bi-distilled water, then the mixture was heated from room temperature to targeted temperature with a rate of 5°C/min in air atmosphere. The reaction was performed at constant temperature (200°C, 220°C and 240°C) for various holding time (0 h, 1 h, 3 h and 5 h). Subsequently, the final reaction product was analyzed using FTIR method and XRD method.
The result showed that the synthesis of LiBOB through wet-mixing method offered a high conversion of 99,25% at temperature of 240°C and holding time of 1 h. The shrinking core model applied in this study presented a good approach both for diffusion-controlled and chemical reaction-controlled step. Activation energy for the diffusion and chemical reaction was 20,605 kJ/gmol and 9,926 kJ/gmol respectively. According to the data of activation energy for both models, it was found that the diffusion and chemical reactions was the rate-controlling step.
Keywords: LiBOB, shrinking core, kinetic reaction, electrolyte, solid-solid reaction
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