Lithium batteries have completely changed every field from consumer electronics to electric vehicles, and separators play a crucial role in their performance and safety. Battery separator is one of the materials used in lithium batteries   The battery separator, anode electrode material, cathode electrode material, and electrolyte are the most important lithium-ion battery materials, accounting for approximately 4% of the total cost of lithium-ion battery materials. The lithium battery separator has a large number of tortuous and interconnected micropores, which can ensure the free passage of battery electrolyte ions and form a charging and discharging circuit. Its main function is to isolate the anode and cathode electrodes, preventing battery short circuits.   At the same time, ensure that lithium ions pass through the microporous channels normally during charging and discharging, ensuring the normal operation of the battery. The performance of the battery separator determines the key characteristics of lithium-ion batteries, such as internal resistance, capacity, cycling performance, and charge discharge current density.   At present, the commercialized lithium battery separators mainly include polyethylene (PE) separators, polypropylene (PP) separators, and PE and PP composite multilayer microporous membranes. PE battery separator has high strength and a wide processing range. PP membranes have high porosity, breathability, and mechanical properties. Ordinary 3C batteries mainly use single-layer PE separator or single-layer PP battery separator.   Power batteries generally use PE/PP double-layer battery separators, PP/PP double-layer separators, or PP/PE/PP three-layer separators. However, polyolefin membranes have very obvious drawbacks, such as thermal stability and insufficient wettability of electrolytes, which makes the coating and modification of polyolefin membranes a trend direction. Production process of battery separator   The production process of battery separators is mainly divided into two categories: wet method and dry method. The production process of lithium-ion battery separators includes raw material formula and rapid formula adjustment, microporous preparation technology, and independent design of complete equipment. Among them, microporous preparation technology is the core of lithium-ion battery separator preparation process, which can be divided into dry stretching and wet stretching according to the type of process.   Dry separators have high safety and low cost, and are often used in large lithium iron phosphate power batteries. Due to its thin thickness and high porosity, wet diaphragm has a higher uniformity of pore size and higher permeability. Compared with dry separators, it has certain advantages in mechanical performance, breathability, and physicochemical properties, so it is more widely used in ternary batteries that focus on energy density.   Membrane coating is the ...

“We wish you a merry Christmas, We wish you a merry Christmas and a happy new year...” When you hear this familiar melody, it's Christmas time. Christmas is a holiday celebrated on December 25th each year to commemorate the birth of Jesus Christ. It is one of the most important holidays for Christians worldwide and is also a traditional holiday celebrated by many non-Christians. During Christmas, people often decorate Christmas trees, exchange gifts to express their love and blessings for each other. Furthermore, many families also host grand Christmas dinners, inviting relatives and friends to celebrate Christmas together. Christmas is a joyful and meaningful holiday. And AOTELEC (lithium ion battery equipment manufacturer) wish all of our friends and clients a merry Christmas! After Christmas, New Year's Day is approaching. New Year's Day is the first day of the lunar calendar. It represents a new beginning when people send off the old days and welcome the new ones. We would like to take this opportunity to thank you for your kind support all this while. Our company will be closed from Dec 30 to Jan 1, in observance of the New Year's Day. Any orders will be accepted but will not be processed until Jan 2 , the first business day after the New Year's Day. Sorry for any inconvenience caused.

AOTELEC has packaged a batch of lithium-ion battery materials and laboratory equipment for lithium-ion batteries, and is preparing to send them to the port. This batch of lithium-ion battery materials mainly includes lithium iron phosphate, coin cell battery cases, etc. The equipment includes 2 sets vacuum ovens,  electronic balance, crimping machine, and a ball mill. We can provide lithium-ion battery materials, including cathode materials, anode materials, as well as sodium battery materials.

Today, the pouch cell battery machine lab line shipped to Sri Lanka ,the equipment mainly includes the following types:  Vacuum drying over, Battery mixing machine, Film coating machine, Battery electrode calendering machine, e Ectrode cutting machine, Die cutting machine for Pouch cell, Battery stacking machine, Ultrasonic spot welding machine for battery tab, Heat sealing machine for Pouch case, Vacuum pre-sealing machine for touch cells, s etc     AOT battery also provides various battery materials, including cathode materials, anode materials,  battery cases, battery separators, electrolytes, etc. Solid state battery materials: NPSCl (Na5.5PS4.5Cl1.5) LLZO,NASICON etc.; Sodium ion battery materials: Prussian blue Prussian white, hard carbon, Sodium metal disks chips . sodium foil etc.

1. Layered oxide cathode material Layered oxides  in sodium ion batteries material have inherent cost advantages, not only because these materials can learn from the highly mature solid-state or co precipitation methods commonly used in lithium-ion batteries to achieve low-cost large-scale production, but also because they have a rich selection of active elements. The chemical formula of layered oxide positive electrode materials for sodium ion batteries can be expressed as NaxTMO2 (x ≤ 1, where TM is one or more of the 3D transition metals such as Ni, Mn, Fe, Co, Cu, etc.). By studying the coordination environment of sodium ions and the stacking mode of oxygen, layered oxides can be classified into the following categories: 2. Polyanionic positive electrode material Polyanion positive electrodes have better thermal stability and thus better safety, but their biggest drawback is their low electronic conductivity, which prevents them from charging and discharging under high currents, and their specific capacity is low. Therefore, its conductivity is often improved by coating and doping, thereby improving its electrochemical performance. The general formula of polyanionic compounds can be expressed as NaxMy [(XOm) n –] z, where M is an electrically active transition metal and X is a non-metallic element such as P, S, Si, etc. Among them, sodium vanadium phosphate [Na3V2 (PO4) 3] material with NASCON (Na Super ionic conductor) structure has high voltage and specific capacity. 1.3 Prussian Blue Cathode Materials The Prussian blue cathode material has a perovskite like structure and a face centered cubic structure. The molecular formula is AxM [Fe (CN) 6] y · zH2O (0

1.Small Vacuum Slurry Mixer Machine AOT-AX-2000 2.53L Vacuum Drying Oven  For Lab Battery Raw Material Baking AOT-DZF-6050 3.Automatic Pouch Cell Stacking Machine AOT-MSK-111A-ES 4.Heating Sealer Machine For Pouch Cell Case Top And Side SealingAOT-TSS-200 5Aluminum Laminated Film Forming Machine AOT-MPF-200 6Pole Piece Electrode Die Cutting Machine  AOT-DC-80 7.2000W 20KHz Ultrasonic Spot Welder Machine AOT-USW-2000W 8. Pouch Cell Hot Press Shaping Machine AOT-HPS-200H

In terms of technology:   1. The positive electrode ingredient has too little conductive agent (the conductivity between materials is not good because the conductivity of lithium cobalt itself is very poor) 2. There is too much adhesive for the positive electrode ingredient. (Adhesives are generally polymer materials with strong insulation properties) 3. Excessive adhesive for negative electrode ingredients. (Adhesives are generally polymer materials with strong insulation properties) 4. Uneven distribution of ingredients. 5. Incomplete binder solvent during ingredient preparation. (Not completely soluble in NMP, water) 6. The density design of the coating slurry surface is too high. (Long ion migration distance) 7. The compaction density is too high, and the rolling is too compacted. (Excessive rolling may cause damage to the structure of active substances) 8. The positive electrode tab is not firmly welded, resulting in virtual welding. 9. The negative electrode ear is not firmly welded or riveted, resulting in false soldering or detachment. 10. The winding is not tight and the core is loose. (Increase the distance between positive and negative electrode plates) 11. The positive electrode ear is not firmly welded to the housing. 12. The negative electrode ear and pole are not firmly welded. 13. If the baking temperature of the battery is too high, the diaphragm will shrink. (Reduced diaphragm aperture) 14. Insufficient liquid injection amount (conductivity decreases, internal resistance increases quickly after circulation!) 15. The storage time after liquid injection is too short, and the electrolyte is not fully soaked 16. Not fully activated during formation. 17. Excessive leakage of electrolyte during the formation process. 18. Insufficient water control during the production process, resulting in battery expansion. 19. The battery charging voltage is set too high, causing overcharging. 20. Unreasonable battery storage environment.   In terms of materials: 21. The positive electrode material has high resistance. (Poor conductivity, such as lithium iron phosphate) 22. Impact of battery separator material (separator thickness, small porosity, small pore size) 23. Effects of battery electrolyte materials. (Low conductivity, high viscosity) 2 24. Positive electrode PVDF material influence. (high in weight or molecular weight) 25. The influence of positive electrode conductive material. (Poor conductivity, high resistance) 26. Effects of positive and negative electrode tab materials (thin thickness, poor conductivity, uneven thickness, and poor material purity) 27. Copper foil and aluminum foil materials have poor conductivity or surface oxides. 28. The riveting contact internal resistance of the cover plate pole is too high. 29. The negative electrode material has high resistance. 30. Deviation of internal resistance testing instruments.  

The electrolyte is in a harsh living environment. It faces the strong reducibility of the negative electrode and the strong oxidation of the positive electrode. Adding flame retardants to make the electrolyte non combustible and reduce its flammability is an effective way to improve the safety of batteries. However, this approach has limited improvement in battery safety, especially when the capacity of commercial batteries exceeds 100 ampere hours, and flame retardants cannot stop them,Because the combustion of batteries is contributed by combustible gases.   During the process of thermal runaway, there are two factors that lead to thermal runaway safety. One contributes to combustible gases, and the other contributes to oxygen and temperature.   The first is combustible gas: Flame retardants can only ensure that the electrolyte is not combustible in a liquid state, but the negative electrode reacts with the electrolyte to produce a large amount of reducing gas, which is flammable and provides a foundation for combustion.   The second is that the exothermic reaction of the battery body provides high temperature. The solid body generates oxygen when heated at around 200 degrees Celsius, and the solid part of the battery provides a high-temperature environment; Combustible gases themselves can burn, and the solid part provides a temperature, which inevitably leads to combustion.   By changing the reaction path between the electrolyte and the negative electrode, reducing the types and quantities of reducing gases, the safety of the battery can be improved from this perspective. In the thermal runaway test, there are three temperatures that represent different physical meanings:   T1 represents the battery entering the self heating stage, where the negative electrode reacts with the electrolyte to form a reducing gas. The reducing gas flows to the positive electrode, attacking the lattice of the positive electrode, causing a phase transition and oxygen release. Oxygen reacts with EC in the electrolyte, causing a temperature increase. Form T2, which is the triggering temperature for thermal runaway. The time spent in the temperature range of T1 and T2 is relatively long, and work can be done from passive protection. The positive and negative poles react violently, forming the highest temperature T3.   Regulation method: 1. Electric regulation: discharge control of the battery. Because the reaction is for electrons, through discharge, electrons are released, and if electrons are not released, reducing gases cannot be generated. 2. Gas regulation: Use intelligent exhaust valves to forcibly exhaust, avoiding crosstalk, accumulation, and combustion. 3. Cooling: Reduce reaction speed. 4. Poisoning agent: Release a poison agent on the composite collector to absorb the gas. 5. Reduce or block the path of combustible gas production. For example, EC free, or reducing the amount of EC electrolyte, such as perfluorinated electrolyt...