CAJ | 학술논문

为改进传统固相法制备锂离子电池正极材料原料混合均匀性较低的缺点，将原料粉体磨细成粒度<1μm的超细粉体，以提高原料混合的均匀度，再进行焙烧合成，是一种新的制备方法。但超细粉体由于比表面积大，在制备、后处理和应用过程中极易发生团聚长大，影响后续制备过程和产品性能。添加适当的分散剂可以改善超细粉体分散稳定性能，防止团聚，同时有利于浆料磨制过程的进行。研究了柠檬酸铵、四甲基氢氧化铵、聚乙烯吡咯烷酮、一缩二乙二醇、三乙醇胺、马来酸-丙烯酸共聚物等6种不同分散剂对制备锂镍钴锰氧化物的原料在水中分散特性的影响。采用分散相的沉降实验、浆料流变行为和分散后颗粒的粒度分布实验等方法评价了分散效果。结果表明，在所研究的几种分散剂中，锂镍钴锰氧化物前驱物在水介质中最有效的分散剂是马来酸-丙烯酸共聚物。
위개진전통고상법제비리리자전지정겁재료원료혼합균균성교저적결점，장원료분체마세성립도<1μm적초세분체，이제고원료혼합적균균도，재진행배소합성，시일충신적제비방법。단초세분체유우비표면적대，재제비、후처리화응용과정중겁역발생단취장대，영향후속제비과정화산품성능。첨가괄당적분산제가이개선초세분체분산은정성능，방지단취，동시유리우장료마제과정적진행。연구료저몽산안、사갑기경양화안、취을희필각완동、일축이을이순、삼을순알、마래산-병희산공취물등6충불동분산제대제비리얼고맹양화물적원료재수중분산특성적영향。채용분산상적침강실험、장료류변행위화분산후과립적립도분포실험등방법평개료분산효과。결과표명，재소연구적궤충분산제중，리얼고맹양화물전구물재수개질중최유효적분산제시마래산-병희산공취물。
Pulverizing the raw material powder into ultra-fine powder within less than 1 μm particle size,and then calcining was a new method to prepare lithium-ion battery cathode materials,which overcomes the short-coming of traditional solid-phase method that the mixing uniformity of raw materials was relatively low.Never-theless,due to the large specific surface area,ultra-fine powders tend to agglomerate during the synthesis,pro-cessing and application,which could affect subsequent process and product performance.Appending the appro-priate dispersant can improve the stability of the suspension to lessen agglomerate,and shorten the grinding process of the aqueous suspension as well. <br> In this article,dispersing abilities of six kinds of dispersants for raw material particles of Li-Ni-Co-Mn ox-ide suspension in aqueous media are discussed.These dispersants are ammonium citrate,tetramethylammonium hydroxide,polyvinylpyrrolidone,diethylene glycol,trolamine,and poly (acrylic acid-co-maleic acid).Sediment experiments,rheology characterization and the size distribution of the dispersed particles in aqueous solution were employed to characterize the particle dispersion.Experimental results show that the most effective disper-sant for raw material particles of Li-Ni-Co-Mn oxide in aqueous media was poly (acrylic acid-co-maleic acid).