【作者】 李辉；

【导师】 张裕中；

【作者基本信息】 江南大学 ， 机械设计及理论， 2011， 硕士

【摘要】 本文针对锂电池浆料粘度大、粉料细、易团聚等浆料特性以及传统的锂电池浆料混合设备存在混合分散不彻底、有死角、效率低、能耗大等问题,提出了将宏观混合技术与微观分散技术集成优化的新思路及解决方法。本文将从浆料分散特性及高速剪切超细分散机理出发,设计新型高速剪切超细分散设备及高效分散系统,为实现锂电池浆料的快速混合分散、为缩短时间、降低能耗、提高品质,提供一定的理论与应用依据。本文研究了高粘度浆料分散特性及高速剪切超细分散机理,对高速剪切超细分散设备内部定转子间高剪切区、叶轮区域及定转子齿槽区域的流场分布进行了一定的理论研究。探讨了高速剪切超细分散设备关键结构参数与操作参数对剪切分散效果的影响。运用FLUENT软件对比分析了设备部分关键参数的不同选择对流场分布的影响,为锂电池浆料高效分散设备的进一步研究与设计提供了一定的理论依据与技术参考。通过模拟分析结果,在原有高速剪切超细分散设备的基础上进行一定的关键部件结构设计与整体设计,运用FLUENT软件对新型高速剪切超细分散设备内部的流场分布进行固液两相流三维模拟,分析了速度场、压力场、固相体积浓度场及剪切应力应变场等分布情况。将传统的慢速行星式混合方法与快速剪切式分散方法相结合,设计了锂电池浆料高效分散系统,并与传统行星式生产设备进行了分析比较,为解决锂电池浆料在生产中存在的高效混合分散难题提供了一定的设备与技术支持。采用慢速行星式混合方法与快速剪切式分散方法相结合的新型生产工艺及传统工艺对锂电池负极浆料进行了初步的分散实验研究。实验结果表明,新型工艺不仅提高了锂电池浆料的混合分散品质、较大地提高了混合效率,而且可以减少电极浆料中液体介质用量,缩短浆料烘烤时间,提高涂布效率。更多还原

【Abstract】 According to the high viscosity, fine powder and easy reunion feature of lithium-ion batteries’slurry and incomplete mixing, low efficiency and high power consumption of the common mixing equipment, a new idea and method of integrating optimization of macro mixing technology and micro dispersion technique was proposed. In order to increase the efficiency of lithium battery slurry and dispersing quality, this paper studied the characteristic of lithium-ion battery slurry and the high-shear dispersion mechanism, designed new high-shear superfine dispersion equipment and high effective dispersion system.In this paper, the characteristic of lithium-ion battery slurry and the high-shear dispersion mechanism were analyzed. In order to research the flow distributions of the super shearing scattered. In this paper, according to basal hydro mechanical equation and mathematic theorem, the distribution of liquid flow-field at the rotor and stator in the high shearing zone and the notching was established, and the place of the maximum shear stress was analyzed too. The qualitative geometric parameters, the working parameters on the effect of dispersion were gained. The different structure of impeller, stator slot width and impeller parameters such as speed were discussed. The results of the research will provide some guidance for the later research.According to the simulation results, certain key component and the overall structures were designed based on the original ultra-shear dispersion mechanism. The flow patterns in high shearing disperser have been performed by numerical simulation using commercial computational fluid dynamics package. The wall shear stress field, pressure field, velocity field and the volume fraction of second phase were discussed. According to the problems of the lithium-ion battery slurry, a new idea and method of macro mixing technology and micro dispersion technique was integrated. Base on the new technique, the high effective dispersion system for lithium-ion battery slurry was designed. It provides certain theoretical and equipment basis to optimize the machine for improving the effects of dispersion.Some experiments for dispersing the cathode lithium ion slurry have been done by the high shearing disperser and traditional production technology. The results show that utilization of the high-shear technology in the lithium ion battery slurry is beneficial to not only improve its uniform quality and mixing efficiency remarkably, but also reduce the dosage of medium, shorten the baking time and raising the coating efficiency.更多还原