In the first half of 2020, China's lithium battery coated diaphragm shipments were 860 million square meters, driving the shipment of coating materials to 8,900 tons.
Recently, survey data shows that in the first half of 2020, China's shipments of lithium-ion battery coated separators are expected to be 860 million square meters, accounting for 55.7% of all separator shipments. White paper data shows that the coated diaphragms in the first half of 2020 are mainly wet-coated diaphragms, which are expected to reach 990 million square meters, accounting for 78.0% of the total wet-process diaphragm shipments, and this proportion has further increased.
The increase in the proportion of coated diaphragms and the increase in shipments will further drive the increase in shipments of coating materials. In the first half of 2020, the shipment of inorganic materials for diaphragm coating is estimated to be 8,000 tons, of which high-purity alumina The material is 6,000 tons, and the boehmite material is 2,000 tons. The shipment volume of PVDF, an organic material used for diaphragm coating, was 0.09 million tons.
At present, the mainstream domestic suppliers of high-purity alumina materials include Luoyang Tongrun, Zhejiang Jidun, Tianma New Materials, Xinke Zhonglian, Shanghai Huaming Gona, Lianlian Chemical, Guoci Materials, Qinghai Shengnuo, etc. The leading suppliers of boehmite include Onestone, Chalco Zhengzhou Research Institute, and Tongrun Nano. PVDF mainly relies on imports. The market is still monopolized by foreign companies such as Arkema in France, Solvay in the United States, and Kureha in Japan.
Luo Zhang, general manager of Luoyang Tongrun Info Technology Co., Ltd., said that with the gradual thinning of the separator and the gradual improvement of battery safety performance, the proportion of coated separators would gradually increase. The current mainstream coating materials are still high-purity oxidation Aluminum is the main component. The proportion of boehmite is gradually increasing, and the proportion of ceramic and PVDF mixed coating is gradually increasing. PVDF coated separators are more used in soft pack batteries. Luo Zhang said that although the diaphragm coating process itself is not complicated, the core coating materials and formulations have certain technical thresholds. With the increase in the proportion of coated diaphragms and the growth of diaphragm shipments in the future, the demand for coating materials will also increase.
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