粉末尺寸对等离子喷涂Na_(3)Zr_(2)Si_(2)PO_(12)电解质成分和组织结构的影响  

The Effect of Particle Size on Composition and Microstructure of Na_(3)Zr_(2)Si_(2)PO_(12) Electrolyte Deposited by Air Plasma Spraying

作　　者：陈楠 卜晓晨 熊思琪 雒晓涛[1] 李长久[1] Chen Nan;Bu Xiaochen;Xiong Siqi;Luo Xiaotao;Li Changjiu(State Key Laboratory for Mechanical Behavior of Materials,School of Materials Science and Engineering Xi'an Jiaotong University,Xi'an 710049)

机构地区：[1]西安交通大学材料科学与工程学院,金属材料强度国家重点实验室,西安710049

出　　处：《热喷涂技术》2023年第1期1-12,共12页Thermal Spray Technology

摘　　要：全固态钠离子电池由于安全性和元素丰度等天然优势,在大规模储能领域具有巨大的应用潜力。全固态电池的核心是固态电解质,NASICON型的Na_(3)Zr_(2)Si_(2)PO_(12)(NZSP)电解质因为离子电导率高、热稳定性与力学性能优异等优点而受到广泛关注。本研究采用大气等离子喷涂沉积单个NZSP扁平粒子和沉积体,系统研究了粉末粒度分布和喷涂参数对NZSP粒子元素蒸发和沉积体组织结构的影响。通过沉积单个粒子,揭示了等离子喷涂参数对NZSP粉末粒子的熔化程度和Na、P元素优先蒸发的影响规律。结果表明,等离子电弧功率与氢气流量对其蒸发影响显著,元素蒸发损失量存在明显的粒子尺寸效应,粒径小于约35μm时,随粒径的减小,Na与P的蒸发损失量显著增加,当粒径增加至35μm以上时,Na与P的蒸发损失量受粒径的影响显著减小且整体损失量也有限;通过对粒径范围的控制能够将等离子喷涂过程中Na元素的损失量控制在10%以下,P元素损失量控制在20%以下。采用粒径范围30~50μm的NZSP粉末,结合大气等离子喷涂参数控制可以得到无明显层状结构的良好层间结合的组织结构致密电解质,表明大气等离子喷涂在全固态钠离子电池固态电解质的制备中具有广阔的应用前景。Owning to its natural advantages of safety and element abundance,all-solid-state sodium-ion batteries have great potential for large-scale energy storage applications.Compared with traditional organic electrolyte sodium-ion batteries,solid-state sodium-ion batteries have the advantages of non-flammability and high thermal stability,and solid electrolytes exhibit good mechanical strength,which is conducive to the direct stacking of unit components,and is more in line with the safety and structural requirements of large-scale energy storage equipment.The core component of the all-solid-state battery is the solid electrolyte.The NASICON-type Na_(3)Zr_(2)Si_(2)PO_(12)(NZSP)electrolyte has been widely studied due to its high ionic conductivity,thermal stability,and excellent mechanical properties.Air plasma spraying(APS)has been widely used in the field of ceramic coating deposition as a cost-effective,large-scale coating preparation process.Our previous investigations showed that for ceramic materials with melting points below about 1500℃,dense coatings with fully bonded splats can be prepared by APS at room temperature.In this study,both single splats and NZSP coatings were deposited by APS using Ar-H2 plasma,and the influence of powder particle size distribution and spray parameters on the elemental preferential evaporation during spraying and microstructure of NZSP coatings were systematically investigated.By depositing individual isolated splats,the influence of plasma spray parameters on the NZSP particle melting degree and the preferential evaporation loss of Na and P elements were examined.The splats were deposited on a preheated substrate and thus the splats deposited from fully molten particles present a regular disk shape while splats from semi-molten droplets present a shape with splashed arms.The morphology of splats was examined by both scaning electron microscopy(SEM)and three dimensional conforcal laser microscopy.Accordingly,the fraction of molten droplets can be estimated based on test of the fract

关 键 词：等离子喷涂 NASICON电解质 Na_(3)Zr_(2)Si_(2)PO_(12) 元素优先蒸发 尺寸效应 

分 类 号：TG174.4[金属学及工艺—金属表面处理]