PVDF烧结时间对类石墨烯碳/LiFePO₄正极材料性能影响的研究

Effect of PVDF Sintering Time on Properties of Graphene-Like Carbon/LiFePO₄ Cathode Materials

摘要: 由于石墨烯材料价格昂贵，本论文旨在通过使用聚偏氟乙烯(PVDF)粉末生产价格低廉的类石墨烯碳材料在某些部件上代替石墨烯材料。本文采用通过溶液浇铸法和固相烧结将PVDF粉末制备出类石墨烯碳材料。本实验使用偏光显微镜观察烧结后的类石墨烯碳的形貌，使用激光粒度分布仪测试其粒度及分布，使用X射线衍射(XRD)和红外光谱分析(IR)其成分和结构，使用电化学工作站测试类石墨烯碳/磷酸铁锂半电池的电化学性能。结果表明：烧结时间越长，产品的粒径数值越小，电池的充放电可逆性更加优良，锂离子(Li⁺)脱嵌更容易且形成的固体电解质界面(SEI)膜质量更好。

Abstract: Because the price of graphene materials is expensive, this paper aims to produce low-cost graphene-like carbon materials by using polyvinylidene fluoride (PVDF) powder to replace graphene materials in some parts. In this paper, graphene-like carbon materials were prepared from PVDF powder by solution casting and solid phase sintering method. In this experiment, the morphology of graphene-like carbon was observed by polarizing microscope, the particle size and distribution were measured by laser particle size analyzer, the composition and structure were analyzed by X-ray diffraction (XRD) and infrared spectroscopy (IR), and the electrochemical performance of graphene-like carbon/LiFePO₄ battery was tested by electrochemical workstation. The results showed, with the increasing of sintering time, the smaller the particle size of the product, the better the charge discharge reversibility of the battery, the easier the Li⁺ intercalation and the better the quality of the SEI film.