Continued from Kyocera to Roll Out New Li-ion Battery in 2020 (1)

According to 24M Technologies Inc, whose technology is the base of the new battery, the thickness of the slurry can be 300-500μm, which is about five times larger than that of existing batteries (60-110μm).

If the new battery incorporates the same amount of active materials as existing batteries, it becomes possible to reduce the amount of metal foil, enabling to reduce material cost and improve energy density. The energy density of this part is three to four times higher, compared with existing products.

24M's slurry contains electrolyte and is viscous. Focusing on the viscous slurry, the company calls the new battery a "clay type" battery.

The simplified manufacturing process reduces the length of production line, which is sometime as long as 70m for the existing batteries, is reduced to about 1/3. As a result, it becomes possible to reduce not only facility cost but also the area of a factory building. (source: 24M Technologies)

The amount of raw materials was drastically reduced by thickly applying active materials. A comparison between the cross-sections of the electrodes of existing Li-ion batteries and the new battery (left) and a comparison in the ratio of reduction of material cost (right) (source: 24M Technologies).

Safety, reliability enhanced by improving design

The new battery features (1) a design improvement for enhancing safety and reliability and (2) a technical characteristic that can improve capacity density to a level that existing batteries cannot realize. In addition, it enables to recycle rare materials at a low cost without decomposing them.

First, to ensure a high safety and high reliability, Kyocera prevented the variations of production process from causing defects. In the case of existing Li-ion batteries, electrolyte and a separator are sandwiched between electrodes, constituting a battery cell.

Sometimes, metal powder produced at the time of severing and welding for constituting a cell enters a cell, or a short-circuit is caused between the positive and negative electrodes due to the displacement of electrode, causing a fire accident.

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