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According to Gu Chuanming, the separator is one of the four key materials of lithium-ion batteries. It acts as an isolation function to prevent short-circuit contact between the positive and negative electrodes, and provides an ion transport channel during charge and discharge. Its performance has certain influence on the internal resistance, capacity, cycle performance and safety performance of the battery. As the material with the highest technical content and the latest localization, the development of domestic diaphragm will play a crucial role in the development of China's lithium battery industry. Important role.
Gu Chuanming believes that the existing single diaphragm can not fully meet the requirements of battery companies, and the composite diaphragm is the future development direction. Lithium-ion batteries have requirements for diaphragms:
High consistency and stability: Based on the current international popular dry single pull and wet method technology, diaphragm companies are required to adopt more advanced hole making technology.
To meet the high capacity of the battery and the production process requirements: as thin as possible, but also must have a certain strength, which requires the diaphragm company to use better stretching technology.
High liquid absorption and liquid retention: The porosity is as high as possible, and the contact angle of the liquid absorption is as small as possible. This requires the diaphragm to have a good internal structure of the hole.
High safety: The diaphragm is required to have higher heat resistance, and it is better to have a lower heat shutdown performance.
Low cost: large-scale production, improved yield, cost control, and technology upgrades.
In the selection and evaluation of the diaphragm, Gu Chuanming believes that the dry diaphragm is superior to the wet diaphragm by price. According to the thickness selection, when the thickness is higher than 16u, the dry diaphragm is the most cost-effective; when the thickness is lower than 16u, the wet diaphragm is selected; when the thickness is 16u, both the dry method and the wet method can be selected. From a safety point of view, ceramic coating is superior to non-coated diaphragms, and wet ceramic diaphragms are slightly better than dry ceramic diaphragms. From the pursuit of energy density selection, wet diaphragms are superior to dry diaphragms. From a performance point of view, the dry diaphragm (referred to as a single diaphragm) is not much different from the wet method.
Battery composite diaphragm is the future development trend
Recently, Polyfluoropoly Chemical Co., Ltd. invited Zhang Shujiang, a senior expert in the domestic lithium battery industry, to be a representative battery material manufacturer and an upstream lithium carbonate manufacturer in the industry. The downstream car companies have gathered together to develop the pulse power battery technology and market trends.