Poly(4-methyl-1-pentene) lithium-ion battery diaphragm and preparation method thereof

• Main Authors: HUANG ENDE, CHEN XIUFENG
• Format: Patent
• Language: Chinese; English
• Published: 08.06.2016
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; ELECTRICITY; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

The invention discloses a poly(4-methyl-1-pentene) lithium-ion battery diaphragm and a preparation method thereof. The poly(4-methyl-1-pentene) lithium-ion battery diaphragm is prepared from relevant raw materials such as a poly(4-methyl-1-pentene) homopolymer, a copolymer with a poly(4-methyl-1-pentene) structural unit, an antioxidant, a slipping agent, a plasticizer and a nucleating agent. The invention also discloses a preparation method for processing the poly(4-methyl-1-pentene) lithium-ion battery diaphragm by using the raw materials. The method comprises the following steps: step one, uniformly stirring poly(4-methyl-1-pentene), the antioxidant, the slipping agent, the plasticizer, the nucleating agent and other additives via a stirring mixer to obtain a mixture I; step two, adding the mixture I into an extrusion casting system for casting to prepare a precursor film; step three, putting the prepared precursor film into a constant-temperature drying box for carrying out annealing treatment; step four,