News Details
Crosslinking agent for waterborne carbon coating
2017-6-30 15:58:43
Crosslinking agent for waterborne carbon coating
The lithium ion battery industry in China is characterized by high safety, stability and long service life.
The growth of the market demand for electric vehicles gives the power lithium battery a high ratio capacity, high ratio and long service life. The positive electrode set fluid is one of the important factors that influence the performance of dynamic battery. The positive set fluid of the aluminum foil is usually used for lithium battery, but adhesion strength deficiencies, poor wettability and contact resistance is high, especially at high rate charge and discharge, high battery internal resistance and heat release, reduce the battery life.
Carbon foil is increasingly favored by power cells. The use of carbon foil as the positive electrode can increase the infiltration and adhesion of the positive electrode materials, reduce the polarization resistance, improve the consistency of the battery, and improve the performance of the high magnification.
At present, the coated aluminum foil on the market is coated with the conductive carbon paste on the surface of the aluminum foil, forming a carbon coating of 1 ~ 3 mu m. Carbon - based conductive coating is the core of carbon - coated aluminum foil technology. In order to meet the needs of green environmental protection in the market, the water-based carbon conductive coating has become a research hotspot of domestic companies and research institutes.
The most important part of the preparation process of carbon and aluminum foil is the preparation of conductive carbon paste. The conductive carbon slurry consists of carbon materials, films, solvents and auxiliaries. The film forming agent is a common adhesive such as acrylic acid, polyurethane, epoxy resin, polyester and alkyd resin. In order to increase the film performance, the agent is often used in conjunction with the crosslinking agent. Solvent is the real solvent of resin, which has a certain wettability to carbon materials.
The effect of carbon aluminum foil on the lithium battery. Carbon - coated aluminum foil is the material used for the positive electrode of lithium ion battery after adding carbon coating on the surface of aluminum foil. The carbon materials in the coating include carbon black, graphite flake and graphene. When the carbon material is mixed with a certain agent, solvent and auxiliary agent, the coating is coated on the surface of the aluminum foil and formed a dense layer of carbon coating after drying.
The resistivity of lithium iron phosphate material is high, and the contact area of the granulated iron phosphate and aluminum foil is small, and the interface resistance is higher. When there is current flow, the material interface polarization is high, resulting in a large resistance of the battery and poor performance of the high ratio.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
A reagent grade additives
As shown in table 1, the diffusion coefficient and conductivity of LiFePO4 are low in several poly-positive materials. In order to improve performance, particle size, carbon coating and metal doping can be used.
Replacing conventional aluminum foil with carbon foil is the simplest and most practical way to improve the performance of LiFePO4 battery, and can be imported directly on existing production line. The performance of carbon - coated aluminum foil is mainly reflected in: when a layer of carbon transition layer is introduced into the fluid surface, the lithium iron phosphate particles are embedded into the carbon particles and have greater contact area.
Carbon layer and cathode material in Super - p, Ks - 6 full contact, such as conducting and forge closer bonding network, can solve the lithium iron phosphate poor caking property and low electrical conductivity, and matrix cycle easy off powder, lower the resistance, improve the rate performance.
Compared with the 20 specifications, the capacity of the platform is 22.5 Ah. Four manufacturers of coated aluminum foil have significantly improved battery resistance, with a reduction of more than 50%. The separation strength of the positive electrode coating on the coated aluminum foil also improved obviously. Using a carbon coated aluminum foil cell, the lower ratio is less obvious than the capacity improvement, but the high magnification is significant.
The conductive coating is divided into this characteristic conductive coating and filled type conductive coating. This characteristic conductive coating is the coating which USES the conductive polymer, such as polyacetylene, polyphenylene, polypyrrole, polyphenol and polyaniline. But these conductive macromolecules are difficult to process and the conjugate structure is vulnerable to damage and high manufacturing cost.
The filling type conductive coating is a kind of conductive filler such as metal filler, carbon material and film forming agent, solvent and auxiliaries. In the conductive slurry prepared by liu yuanrui, the coating obtained high conductivity [9] when the amount of silver powder was 4 %. To increase coating performance, often adding coupling agent and adhesion promoter, such as NTCA01 titanate coupling agent on the surface of carbon black processing after carbon black surface free energy is reduced, dispersion strengthening, it is easier to the formation of conductive network in paint.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
The lithium ion battery industry in China is characterized by high safety, stability and long service life.
The growth of the market demand for electric vehicles gives the power lithium battery a high ratio capacity, high ratio and long service life. The positive electrode set fluid is one of the important factors that influence the performance of dynamic battery. The positive set fluid of the aluminum foil is usually used for lithium battery, but adhesion strength deficiencies, poor wettability and contact resistance is high, especially at high rate charge and discharge, high battery internal resistance and heat release, reduce the battery life.
Carbon foil is increasingly favored by power cells. The use of carbon foil as the positive electrode can increase the infiltration and adhesion of the positive electrode materials, reduce the polarization resistance, improve the consistency of the battery, and improve the performance of the high magnification.
At present, the coated aluminum foil on the market is coated with the conductive carbon paste on the surface of the aluminum foil, forming a carbon coating of 1 ~ 3 mu m. Carbon - based conductive coating is the core of carbon - coated aluminum foil technology. In order to meet the needs of green environmental protection in the market, the water-based carbon conductive coating has become a research hotspot of domestic companies and research institutes.
The most important part of the preparation process of carbon and aluminum foil is the preparation of conductive carbon paste. The conductive carbon slurry consists of carbon materials, films, solvents and auxiliaries. The film forming agent is a common adhesive such as acrylic acid, polyurethane, epoxy resin, polyester and alkyd resin. In order to increase the film performance, the agent is often used in conjunction with the crosslinking agent. Solvent is the real solvent of resin, which has a certain wettability to carbon materials.
The effect of carbon aluminum foil on the lithium battery. Carbon - coated aluminum foil is the material used for the positive electrode of lithium ion battery after adding carbon coating on the surface of aluminum foil. The carbon materials in the coating include carbon black, graphite flake and graphene. When the carbon material is mixed with a certain agent, solvent and auxiliary agent, the coating is coated on the surface of the aluminum foil and formed a dense layer of carbon coating after drying.
The resistivity of lithium iron phosphate material is high, and the contact area of the granulated iron phosphate and aluminum foil is small, and the interface resistance is higher. When there is current flow, the material interface polarization is high, resulting in a large resistance of the battery and poor performance of the high ratio.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
A reagent grade additives
As shown in table 1, the diffusion coefficient and conductivity of LiFePO4 are low in several poly-positive materials. In order to improve performance, particle size, carbon coating and metal doping can be used.
Replacing conventional aluminum foil with carbon foil is the simplest and most practical way to improve the performance of LiFePO4 battery, and can be imported directly on existing production line. The performance of carbon - coated aluminum foil is mainly reflected in: when a layer of carbon transition layer is introduced into the fluid surface, the lithium iron phosphate particles are embedded into the carbon particles and have greater contact area.
Carbon layer and cathode material in Super - p, Ks - 6 full contact, such as conducting and forge closer bonding network, can solve the lithium iron phosphate poor caking property and low electrical conductivity, and matrix cycle easy off powder, lower the resistance, improve the rate performance.
Compared with the 20 specifications, the capacity of the platform is 22.5 Ah. Four manufacturers of coated aluminum foil have significantly improved battery resistance, with a reduction of more than 50%. The separation strength of the positive electrode coating on the coated aluminum foil also improved obviously. Using a carbon coated aluminum foil cell, the lower ratio is less obvious than the capacity improvement, but the high magnification is significant.
The conductive coating is divided into this characteristic conductive coating and filled type conductive coating. This characteristic conductive coating is the coating which USES the conductive polymer, such as polyacetylene, polyphenylene, polypyrrole, polyphenol and polyaniline. But these conductive macromolecules are difficult to process and the conjugate structure is vulnerable to damage and high manufacturing cost.
The filling type conductive coating is a kind of conductive filler such as metal filler, carbon material and film forming agent, solvent and auxiliaries. In the conductive slurry prepared by liu yuanrui, the coating obtained high conductivity [9] when the amount of silver powder was 4 %. To increase coating performance, often adding coupling agent and adhesion promoter, such as NTCA01 titanate coupling agent on the surface of carbon black processing after carbon black surface free energy is reduced, dispersion strengthening, it is easier to the formation of conductive network in paint.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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