A special agitator shaft with symmetrically arranged agitator pegs and sleeves of tungsten carbide for wear protection devel- Vertical, batch operation mill for the preparation of tungsten Ideal flow behaviour due to a special agitator peg arrange-ment and the hemispherically shaped chamber floor integrated screen plate for grinding media separationIntensive cooling through a double-wall grinding tank and cooled circulation pipeline
Product inlet via rotor / immersion tube system prevents back flow of grinding media into the feed line.
Generally, there are two ways to obtain nano-powders. A bottom-up manufacturing method (bottom up) for chemical methods, such as chemical precipitation, sol-gel process (sol-gel),... Another method is physical method, which changes the powder particles from big to small (top down), such as mechanical ball milling,... And so on.
The Development In 1963, the first vertical agitator was developed internationally, the first horizontal agitator was developed in 1975, the first horizontal agitator bead mill with eccentric disks was introduced to the public and the horizontal disc grinder was introduced, in 2004, which became the industry standard. In the following years, the grinding media separation systems, the geometry of the grinding disks and the various grinding chamber materials were further developed.
The grinding system pin nanomill shows the evolutionary develop- ment of system with the rotor-slotted pipe separating system. The enclosed horizontal agitator mill is designed for highest product throughput rates and possesses a pin grinding system for highest grinding intensity.
In 2011, we developed the first zirconia comminution chamber technology in China. It has no metal ion pollution and is used in batteries, pharmaceuticals, glazes, ink and food.
一是铜铝箔导电性好,质地软,价格便宜。我们都知道,锂电池工作原理是将化学能转化为电能的一种电化学装置,那么在这个过程中,我们需要一种介质把化学能转化的电能传递出来,这里就需要导电的材料。而在普通材料中,金属材料是导电性最好的材料而在金属材料里价格便宜导电性又好的就是铜箔和铝箔。同时,在锂电池中,我们主要有卷绕和叠片两种加工方式。相对于卷绕来说,需要用于制备电池的极片具有一定的柔软性,才能保证极片在卷绕时不发生脆断等问题,而金属材料中,铜铝箔也是质地较软的金属。最后就是考虑电池制备成本,相对来说,铜铝箔价格相对便宜,世界上铜和铝元素资源丰富。
二是铜铝箔在空气中也相对比较稳定。铝很容易跟空气中的氧气发生化学反应,在铝表面层生成一层致密的氧化膜,阻止铝的进一步反应,而这层很薄的氧化膜在电解液中对铝也有一定的保护作用。铜在空气中本身比较稳定,在干燥的空气中基本不反应。
三是锂电池正负极电位决定正极用铝箔,负极用铜箔,而非反过来。正极电位高,铜箔在高电位下很容易被氧化,而铝的氧化电位高,且铝箔表层有致密的氧化膜,对内部的铝也有较好的保护作用。采用两者做集流体都是因为两者导电性好,质地比较软(可能这也会有利于粘结),也相对常见比较廉价,同时两者表面都能形成一层氧化物保护膜。
而通常作为正极的铝箔,其基材氧化铝都需要用到砂磨机,在醇类体系下研磨到1-2微米,涂布后制备铝箔,发挥其最佳物理和化学性能。