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Performance characteristics of ternary polymer lithium battery

Performance characteristics of ternary polymer lithium battery

Release date:2018-11-29 author: clicks:

In the ternary lithium-ion battery capacity and safety of the material balance, the cycle performance is better than the normal lithium cobalt oxide, the nominal voltage is only 3.5-3.6V in the early stage due to technical reasons, there are restrictions on the scope of use, but until now With the continuous improvement of the formula and the perfect structure, the nominal voltage of the battery has reached 3.7V, and the capacity has reached or exceeded the level of lithium cobalt oxide battery.


SANYO, PANASONIC, SONY, LG, and SAMSUNG have launched batteries for ternary materials. A considerable number of notebook battery lines have replaced the previous lithium cobalt oxide batteries with batteries of ternary materials, SANYO. In the SAMSUNG column battery, the production of lithium cobalt oxide batteries turned to ternary cells was completely discontinued. At present, most of the small high-power batteries at home and abroad use ternary cathode materials.


A ternary lithium ion battery refers to a type of polymer containing a metal ion having a specific gravity of 0.94 to 0.960. The softening point is 35 °C. It can be used continuously at 90 ° C in air. The molecular structure is mainly composed of an interpolymer of ethylene and methacrylic acid, on which metal ions are introduced. Ion bonds are used as crosslinks between molecules. Low crystallinity and good transparency. Extensive and flexible, tensile strength and impact strength are high. High molecular weight can be used as a thermoplastic, and low molecular weight can be used as a binder and a laminating resin. The finished film and sheet are very good insulating materials. The adhesive bonds metals, glass, paper and plastic.


Ionic polymers are also known as ionomers, also known as ionomers. A lithium manganate lithium ion battery is a product obtained by introducing a metal ion (such as sodium, potassium, zinc, magnesium, etc.) into a copolymer main chain of a monomer such as ethylene and acrylic acid.


The commonly used ionomers are products obtained by introducing a copolymer of ethylene and methacrylic acid into a sodium or ternary lithium ion battery for cross-linking. The trade name is Surlyn. Since the macromolecular backbone has ionic bonds, The polymer has the physical properties of the crosslinked macromolecule, and has high strength and toughness under normal temperature, but when heated to a certain temperature, the crosslinked chain formed by the metal ion can be dissociated, does not affect its remelting process, and exhibits thermoplasticity. It can be cross-linked after cooling, so it is a high-strength and tough thermoplastic.


The ionic polymer is a polymer containing interchain ionic bonding. They are usually sodium or zinc salts of ethylene methacrylic acid polymers or ethylene acrylic acid polymers, which polymerize under high temperature and high pressure like LDPE to form a branched structure.


Ionic polymer


Ionic polymer


The ionic bond has a reversible cross-linking effect. When heated, the strong attraction between adjacent molecules weakens, causing the material to melt and flow. This bond is re-established when cooled. The amount of acid on the polymer backbone of the lithium iron phosphate lithium ion battery generally accounts for 7% to 30% of its total weight. Not all acids can be neutralized to form salts. Neutralization is generally between 15% and 80%, which has an effect on the physical properties of the ionic polymer. Unneutralized acids provide a place for hydrogen bonding between adjacent molecules. These hydrogen bonds are weaker than the ionic bonds of the salt, but stronger than the ordinary subvalent bonds. Increasing the amount of neutralization and neutralization of the acid enhances tensile strength, modulus, toughness, clarity, melt strength, and oil resistance, but reduces melting point and tear resistance. Zinc-based ionic polymers have a wide range of adhesion and low hygroscopicity, while sodium-based ionic polymers have better chemical properties and grease resistance. [2]


Ionic polymers can also form terpolymers containing acrylic acid, ethylene and methacrylic acid. Another ionic polymer is formed by saponification of an ethylene alkyl acrylate copolymer in which all acid groups are completely neutralized with sodium.


Ionic polymers have excellent melt strength, clarity, softness, strength and toughness. It exhibits superior impact properties and puncture resistance even at low temperatures, making it an ideal material for sharp-skinned packaging. It has a strong ability to absorb ultraviolet light, which increases the heating rate and becomes another advantage for skinning packaging. Its viscosity is good, especially after being soiled, it still has good heat sealing properties. It is widely used in the vacuum packaging of meat products. Its excellent melt strength makes it suitable for deep press thermoforming.


In addition, other applications for lithium iron phosphate lithium ion batteries include the packaging of cheese, fast food, and pharmaceuticals. The acid-neutralized ionic polymer has excellent aluminum foil adhesion and is commonly used to extrude a heat seal layer of a foil-coated structure.


Disadvantages of ionic polymers are: poor gas barrier properties and hygroscopicity, and relatively higher cost than PE and EVA.

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