Influence of sintering temperature on the structure and high-temperature discharge performance of LiNi_1/3Mn_1/3Co_1/3O₂ cathode materials

Abstract

Layered cathode materials of high-temperature lithium batteries, LiNi_1/3Mn_1/3Co_1/3O₂ are synthesized by a sol-gel method with variation in final sintering temperature for borehole applications. The structure, morphology and high-temperature discharge performance of these resulting products are investigated by X-Ray Diffraction (XRD), scanning electron microscopy (SEM), laser particle size analysis, galvanostatic and pulse discharge. The results of structural analysis indicate that the sample sintered at 800 °C has the characteristics of good crystallinity, narrow size distribution and large specific surface area at the same time. The discharge experiments also indicate that this sample has the best electrochemical properties, with the maximum discharge capacities of 314.57 and 434.14 mAh·g^-1 at 200 and 300 °C respectively and the minimum cell internal resistances at both temperatures.

Keywords

sintering temperature / electrochemical properties / LiNi_1/3Mn_1/3Co_1/3O₂ / high-temperature lithium batteries

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