How important is the lithium battery separator?

Lithium battery is one of the four key materials of lithium battery. The performance of the diaphragm determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle and safety performance of the battery. The separator with excellent performance has the overall performance of the battery important role.

The main function of the separator is to separate the positive and negative electrodes of the battery, prevent the two poles from contacting and short-circuit, and also have the function of allowing electrolyte ions to pass. In addition, since the electrolyte is an organic solvent, the separator must also have an organic solvent resistance.

1. The fastest growth rate of output value in the four sub-segments of lithium batteries!

In 2016, the four core materials of lithium batteries: the growth rate of the output value of the positive electrode, the negative electrode, the separator and the electrolyte all exceeded 50%. Among them, the diaphragm production value growth rate is more than 100%. From 2016 to 2020, the diaphragm demand is expected to increase from 20% to 60%. In 2020, the diaphragm demand is expected to exceed 3 billion square meters!

2. The highest technical barriers in the four major segments of lithium batteries, the highest gross profit margin!

Compared with battery materials such as positive electrode, negative electrode, and electrolyte, the separator has long been a field with high return on investment, which highlights the importance of studying lithium battery separators alone!

Lithium battery separator is the key material of the four key materials of lithium battery, which has the lowest yield and the highest technical barrier. It directly determines the performance and safety of lithium battery. At the same time, lithium battery separator has always been the product with the highest gross profit margin among the four materials.

3. In the four major sub-segments of lithium batteries, the cost ratio ranks second!

Among the production costs of the entire lithium battery, the positive electrode material accounted for 30% of the proportion, ranking first; the diaphragm accounted for 25% of the proportion, ranking second; the negative electrode material accounted for 15% of the proportion, ranking third.

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