磷酸铁锂不同颗粒形貌对其性能的影响  

Effect of Different Particle Morphology on Properties of Lithium Iron Phosphate

作　　者：李健 刘俊才 赵圣 黄灵美 黄启行 张仁国 LI Jian;LIU Juncai;ZHAO Sheng;HUANG Lingmei;HUANG Qihang;ZHANG Renguo(Guizhou Weitegao New Energy Technology Co.,Ltd.,Bijie Guizhou 553300,China)

机构地区：[1]贵州唯特高新能源科技有限公司,贵州毕节553300

出　　处：《辽宁化工》2024年第11期1645-1648,共4页Liaoning Chemical Industry

基　　金：贵州省科技支撑计划项目(项目编号:黔科合支撑[2021]一般494);贵州省科技支撑计划项目(项目编号:黔科合支撑[2019]2025号)。

摘　　要：以磷酸铁、碳酸锂和葡萄糖为原料,利用高温固相法合成得到不同颗粒形貌的磷酸铁锂,研究了不同颗粒形貌对其性能的影响。采用了扫描电子显微镜(SEM)、X射线衍射(XRD)、压实密度及恒流充放电测试材料的性能。结果表明:片型磷酸铁锂具有良好的充放电容量,大小颗粒混合的类球形磷酸铁锂具有良好的综合性能。其中片型磷酸铁锂0.2 C倍率下放电容量为163.11 mAh·g^(-1);大小颗粒混合的类球形磷酸铁锂,一次颗粒尺寸400~1000 nm的占比20%~30%、50~300 nm的占比60%以上,同样的制浆条件下,其浆料固质量分数为59.5%,极片压实密度为2.54 g·cm^(-3),0.2 C倍率下放电容量为159.11 mAh·g^(-1)。Lithium iron phosphate with different particle morphology was synthesized from iron phosphate,lithium carbonate and glucose by high temperature solid phase method.The effect of different particle morphology on its properties was studied.Scanning electron microscopy(SEM),X-ray diffraction(XRD),compaction density and constant current charge and discharge were used to test the properties of the materials.The results showed that the tablet type lithium iron phosphate had good charge-discharge capacity,and spherical ferrous lithium phosphate with mixed large and small particles had good comprehensive properties.Among them,the discharge capacity of chip ferrous lithium phosphate at 0.2 C rate was 163.11 mA·h·g^(-1);the spherical ferrous lithium phosphate with mixed large and small particles accounted for 20%~30%of the primary particle size of 400~1000 nm and more than 60%of the primary particle size of 50~300 nm.Under the same pulping conditions,the solid content of the slurry was 59.5%,the compaction density of the pole piece was 2.54 g·cm^(-3),and the discharge capacity was 159.11 mA·h·g^(-1) at 0.2 C rate.

关 键 词：磷酸铁锂 形貌 压实密度 容量 倍率性能 一次颗粒 

分 类 号：TQ016.1[化学工程]