What are the factors that affect the compaction density of lithium battery cathode materials?
Information sources：本站 | Release date：
2020-09-18 15:19:02
| Browse volume：7043
Summary：
In the battery manufacturing process, the compaction density has a greater impact on battery performance. The greater the compaction density, the greater the degree of crushing damage to the positive and negative materials of the lithium battery, the …
In the battery manufacturing process, the compaction density has a greater impact on battery performance. The greater the compaction density, the greater the degree of crushing damage to the positive and negative materials of the lithium battery, the harder the electrolyte is to infiltrate, and the worse the cycle performance of the battery. Therefore, finding the best compaction density is very important for battery design.
So what are the compaction densities that affect the compaction density of lithium battery cathode materials?
1. The true density of the material
At present, the true density of lithium battery cathode materials from several commercial manufacturers and the currently achievable compaction density are shown in the table (the selected lithium battery ternary material is NCM111). It can be seen that the true density of several materials: cobalt Lithium acid>lithium battery ternary material>lithium manganate>lithium iron phosphate, which is consistent with the law of compaction density. It should be pointed out that the true density of ternary materials of different components of lithium batteries varies with the components.
2. Material morphology
It can be seen from the above table that the true density of the lithium battery ternary material (NCM111) and lithium cobalt oxide is not much different, but the compacted density is 0.5g·cm-3 lower than that of lithium cobalt oxide, or even more, leading to this result One of the main reasons is the difference in morphology between lithium cobalt oxide and lithium battery ternary materials.
Currently commercialized lithium cobalt oxide is a primary particle with a large single crystal, while the ternary material for lithium batteries is a secondary agglomerate of small single crystals. The lithium battery ternary material secondary ball formed by agglomeration of multiple primary particles has many voids in itself; and after being prepared into the pole piece, there are still a large number of voids inside, which also reduces the compaction density of the lithium battery ternary material .
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