不同粘结剂对喷雾干燥法制备尖晶石锰酸锂的影响  

Influence of viscosity on preparation of spinel lithium manganate by spray drying

作　　者：阚光伟[1] 李洪亮[1] 傅爱萍[1] 王梦雪[1] 刘慧[1] 王超[1] 赵修松[1] 张亚利 张风太 熊俊威 

机构地区：[1]青岛大学化学化工与环境学院纤维新材料与现代纺织国家重点实验室培育基地,青岛266071 [2]潍坊威能环保电源有限公司,寿光262705

出　　处：《化工新型材料》2013年第3期54-56,71,共4页New Chemical Materials

基　　金：国家重点基础研究发展计划(973计划)项目(2012CB722705);国家高技术研究发展计划(863计划)(2012AA110407);山东省自然科学基金(ZR2009FM022);青岛市科技发展计划(10-3-4-3-4-jch);山东省高校科研发展计划(J10LD12)

摘　　要：喷雾干燥法是制备尖晶石LiMn2O4材料的一种简单、有效的方法。喷雾干燥法制备的颗粒具有形貌规则、粒径大小可控且分布均匀等优点。我们采用先机械球磨成浆料然后再喷雾干燥的方法制备了球形LiMn2O4材料。球磨后所得浆料的黏度对后面利用喷雾干燥制备的LiMn2O4材料有很大影响。在制浆过程中加入粘结剂有助于粉体产物的成型造粒,提高喷雾干燥所得粒子的强度,降低焙烧温度,缩短焙烧时间,降低生产成本。我们采用黏度不同的浆料制备尖晶石型LiMn2O4,结果显示,黏度大的浆料制备的LiMn2O4颗粒较规整,与电解液有较小的接触面积,有效地减小了Mn的溶解,保持LiMn2O4尖晶石晶型稳定,有利于保持优良的电化学循环性能。以粘结剂浓度为3%,黏度为8Pa.s的浆料制备出的LiMn2O4具有更高的可逆容量和更好的循环稳定性能。室温下在0.2C倍率下初始放电比容量为118.9mAh/g,在0.5C下为115.3mAh/g,有较高的初始放电比容量,并且在0.5C下循环30圈之后,放电比容量为114.9mAh/g,保持率为99.7%。Spray drying is a simple and effective process for the preparation of spinel lithium manganate. The particles prepared by the spray drying method showed regular spherical shape, controllable particle size and uniform pore size distribution. The combination of mechanical ball grinding with the spray drying for the preparation of spinel LiMn2O4 material was reported. The viscosity of the precursor slurry derived from the ball grinding influenced obviously on the spray dried LiMn2O4 particles. The addition of binder agent during the pulping process was necessary and high quality LiMn2O4 particles can then be obtained after the spray drying process. In other words, the binder agent can improve the hardness of the particles derived from the spray drying process, lowed the baking temperature, shorted the baking time and reduced the cost. The spinel LiMn2O4 particles were prepared by slurry with different viscosity, it showed that the LiMn2O4 material made from slurry containing 3wt% binder and with a viscosity of SPa. s owned excellent electrochemical performance at room temperature. The high initial reversible capacity of 118. 9mAh/g at 0. 2C rate and 115.3mAh/g at 0. 5C rate, and the capacity was 114. 9mAh/g with capacity retention of 99.7% even after 30 test cycles.

关 键 词：LIMN2O4 黏度 喷雾干燥 比容量 

分 类 号：TM912[电气工程—电力电子与电力传动]