Lithium Battery 3.7V Lithium Polymer Battery 3.2V LifePo4 Battery 1.2V Ni-MH Battery Button Coin Battery
3.7V Battery Pack 7.4V Battery Pack 11.1V Battery Pack 14.8V Battery Pack Other Battery Pack
Sino Science&Technology Battery Co.,ltd is a high-tech production enterprise which specialize in the R&D and production of Lifepo4 batteries,energy storage battery,portable UPS power supply,personalized customization lithium battery pack etc .
Environmental cylindrical 18650 21700 32700 26650 14500 18500 lithium ion rechargeable battery, LifePO4 battery,3.7V lithium polymer battery, NiMH battery , NiCD battery ,Lead acid battery,dry cell battery ,alkaline battery ,heavy duty battery, button cell battery etc. we devote to R&D,innovation ,production & sales
Shenzhen Green Power Energy Battery Co.,ltd specializes in a wide range of digital battery such as environmental cylindrical 18650 21700 32700 26650 14500 18500 lithium ion rechargeable battery, LifePO4 battery, 3.7V lithium polymer battery, NiMH battery, NiCD battery, dry cell battery, alkaline battery, heavy duty battery, button cell battery etc. we devote to R&D, innovation, production & sales. With automatic production machines we have been exported goods to all over the world over 15years. We have complete exported certificate such as KC, CE, UL, BSCI, ROHS, BIS, SGS, PSE etc
Dongguan Datapower New Energy Co.,ltd is a high-tech production enterprise which specialize in the R&D and production&sale of lithium polymer batteries,drone battery,airplane batteries &battery pack etc.
Anhui Seong-hee New Energy Technology Co.,ltd is a high-tech production enterprise which specialize in the R&D and production of primary batteries. And mainly produces and sells alkaline batteries & carbon zinc batteries. there are size AA, AAA, C, D, 9V etc
Guizhou STD Battery Co.,ltd is a high-tech production enterprise which specialize in the R&D and production & sale of lithium polymer batteries, drone battery, airplane batteries & battery pack etc.
release time:2024-03-12 Hits: Popular:AG11 battery
Research progress on lithium-ion battery separator materials?
The difficulty of diaphragm technology lies in the engineering technology of creating holes and the preparation of matrix materials. The hole-making engineering technology includes membrane hole-making technology, production equipment and product stability. Matrix material preparation includes the preparation and modification technology of polypropylene, polyethylene materials and additives. The difficulties in hole-making engineering technology are mainly reflected in insufficient porosity, uneven thickness, and poor strength. This article mainly compares the performance of separators prepared by different processes.
In the structure of lithium-ion batteries, the separator is one of the key inner components. The performance of the separator determines the interface structure and internal resistance of the battery, which directly affects the battery's capacity, cycle and safety performance. Separators with excellent performance play an important role in improving the overall performance of batteries.
The difficulty of diaphragm technology lies in the engineering technology of creating holes and the preparation of matrix materials. The hole-making engineering technology includes membrane hole-making technology, production equipment and product stability. Matrix material preparation includes the preparation and modification technology of polypropylene, polyethylene materials and additives. The difficulties in hole-making engineering technology are mainly reflected in insufficient porosity, uneven thickness, and poor strength. This article mainly compares the performance of separators prepared by different processes.
2 Preparation method of lithium-ion battery separator
Polyethylene (PE) and polypropylene (PP) microporous membranes have higher porosity, lower resistance, higher tear strength, better acid and alkali resistance, good elasticity and resistance to aprotic solvents. It maintains performance, so it is used as a separator material in the early stages of lithium-ion battery research and development. The currently marketed lithium-ion battery separators mainly include single-layer PE, single-layer PP, and 3-layer PP/PE/PP composite films. Lithium-ion battery separators can be divided into two categories: dry method and wet method according to different preparation processes, and the pore formation mechanisms of the separator micropores are different [1~2].
2.1 Dry process
In the dry method, polyolefin resin is melted, extruded, and blown into a crystalline polymer film. After crystallization and annealing, a highly oriented multilayer structure is obtained, which is further stretched at high temperature to peel off the crystalline interface. , forming a porous structure that can increase the pore size of the film. Dry stretching can be divided into dry uniaxial stretching and biaxial stretching according to different stretching directions.
The dry uniaxial stretching process uses hard elastic fibers to prepare highly oriented PE or PP separators with low crystallinity, and then anneales them at high temperature to obtain oriented films with high crystallinity. This film is first stretched at low temperatures to form defects such as silver streaks, and then stretched at high temperatures to form micropores. At present, Celgard Company in the United States and Ube Company in Japan use this process to produce single-layer PE, PP and 3-layer PP/PE/PP composite films. The separator produced by this process has an elongated microporous structure. Since it is only stretched in one direction, the transverse strength of the separator is relatively poor, but there is almost no thermal shrinkage in the transverse direction.
2.2 Wet process
The wet method is also called phase separation method or thermally induced phase separation method. Liquid hydrocarbons or some small molecular substances are mixed with polyolefin resin. After heating and melting, a uniform mixture is formed. Then the temperature is lowered for phase separation, and the film is obtained by pressing. The membrane is heated to a temperature close to the melting point, stretched in two directions to orient the molecular chains, and finally kept warm for a certain period of time. The residual solvent is eluted with volatile substances to prepare interconnected microporous membrane materials. This method is applicable to a wide range of materials. . Companies that adopt this method include Asahi Kasei, Toran, and Nitto of Japan and Entek of the United States [5]. The pore size range of the separator produced by the wet biaxial stretching method is in the order of magnitude of the phase microscopic interface, which is relatively small and uniform. The stretch ratio in both directions can reach 5 to 7, so the separator performance is isotropic, the transverse tensile strength is high, and the puncture strength is high. The normal process flow will not cause perforation, and the product can be made thinner, increasing the energy density of the battery. higher.
Read recommendations:
Development prospects of rechargeable batteries.solar energy storage lithium ion battery 15kwh 48v
Specific requirements for lithium-ion batteries for equipment
Last article:LR1130 battery.Discussing the debate on the BMS balancing technology route for electric vehicle powe
Next article:LR03 alkaline battery.How can the reliability of energy storage battery management systems be improv
Popular recommendation
701224 lipo battery company
2023-03-22lithium ion battery energy storage manufacturer
2023-05-10solar power energy storage battery manufacture
2023-05-10401030 lipo battery
2023-03-22convenient energy storage power supply price
2023-05-10Coin Battery CR 2330
2022-09-27902030 500MAH 3.7V
2023-06-10LR14
2023-02-07522749 880mAh 3.7V
2022-08-19601435 270mAh 3.7V
2022-07-01Coin Battery LR 921
2022-10-15Rack-mounted energy storage battery GN-192V 100Ah
2022-09-27Hanging neck fan
2022-09-22R14
2022-12-01551521 130MAH 3.7V
2023-06-12dry cell battery
2023-06-25CR1616 battery
2023-06-25li ion 18650 battery pack wholesale
2023-06-25CR3032 battery
2023-06-2518650 battery pack Manufacturing
2023-06-25Maintenance rules for unmanned aerial vehicle lithium batteries
2024-06-06Lithium-ion Batteries with Ternary Materials
2024-11-25What are the characteristics of ternary lithium batteries?CR1632 battery
2023-06-20How to ensure the consistency of the 18650 battery pack?button cell battery cr1620
2023-09-18The basic concept of soft pack lithium battery and lithium battery pack and aluminum shell lithium b
2024-03-25Trichous lithium battery or lithium iron phosphate battery?
2023-02-0818650 battery 3.7v 1800mah.What are the advantages of lithium battery manufacturers
2023-10-12How to relocate the UPS power supply host and lithium-ion battery in the computer room?
2023-09-09Classification of ternary lithium batteries
2022-11-19Positive electrode materials for lithium batteries.3.7 volt 18650 lithium battery
2023-09-19