Battery compaction features

How does compaction density affect the battery capacity and specific energy?

The compaction density of the high-rate battery affects the battery capacity and specific energy, the same capacity design, the battery quality is close; the compaction density is different, the thickness of the pole piece is different, and the thickness of the assembled battery is different.

What is compaction density in lithium ion batteries?

In the design of lithium-ion batteries, compaction density = areal density / (thickness after pole piece rolling - thickness of current collector), unit: g / cm3, which is the basic definition. In the fabrication of lithium-ion batteries, compaction density has a large impact on battery performance.

Is compaction density a reference indicator of battery energy density?

Therefore, the compaction density of positive electrode sheet is also regarded as one of the reference indicators of battery energy density . However, there has been little research on increasing the compaction density of LiFePO 4 /C composites.

How does the thickness of a battery affect the LC capacity?

Different compaction densities have a great influence on the thickness of the battery, and the maximum thickness difference is 0.7mm, which is 10% of the thickness of the battery; the effect of different compaction density on the battery lC capacity is not obvious; the thickness change has a larger energy to the battery volume ratio.

Why is compaction density important?

In general, the higher the compaction density, the higher the capacity of the battery can be made, so compaction density is also considered as one of the reference indicators of material energy density. The compaction density is not only related to the size and density of the particles, but also related to the gradation of the particles.

How does compaction density affect electrode structure?

(The pictrue from Internet. All rights reserved.) In the unrolled electrode, only 50% of the space is occupied by the active material, increasing the compaction density can effectively increase the volumetric energy density and weight energy density of the electrode, but this also affects the electrode structure, such as pores.