The guide to conductive additive and how it works
battery capacity, rate performance, and cycle performance.Lithium battery conductive additive is the key auxiliary material of lithium battery, which is used to improve the conductivity of positive and negative electrodes. Conductive additive is a key auxiliary material for lithium-ion batteries, which plays an important role in improving battery conductivity,
The role of lithium electrical conductive additiveSince most of the active materials of positive electrode materials have poor conductivity and large internal resistance, conductive additive is needed to form a conductive network to improve the conductivity between the active materials of electrode materials and the current collector. At present, conductive additive is mainly used on positive electrode sheets. In the future, as The silicon-based negative electrode accelerates the penetration, and the application of the conductive additive on the negative electrode sheet will speed up. In addition, the conductive additive can also improve the processability of the pole piece, promote the infiltration of the electrolyte on the pole piece, effectively increase the migration rate of lithium ions in the electrode material, and reduce polarization, thereby improving the charge and discharge efficiency and service life of the electrode.
Distribution of conductive additive on positive and negative electrodes
- Positive electrode
- Negative electrode
Comparison of old and new conductive additiv
- New conductive additive vs traditional conductive additive
- Conductive carbon black
- Carbon nanotubes
- Conductive graphite
Industrial chain of conductive carbon blackThe overall supply of conductive carbon industry is in short supply. Conductive carbon is used in middle and high-end special carbon in the field of conductive additive. The main component of carbon black is carbon, and its basic particle size is between 10-100nm. Therefore, it has excellent rubber reinforcement, coloring, conductivity or antistatic and ultraviolet absorption functions. It is the earliest nano-scale material developed and applied by humans. Carbon black is produced by incomplete combustion or pyrolysis of hydrocarbon compounds (liquid or gaseous), mainly composed of carbon elements, and exists in the form of colloidal particles similar to spheres and aggregates with colloidal size. The appearance of carbon black is black powder. Carbon black has a wide range of downstream applications, and conductive carbon, that is, it is used in the field of conductive additive. Carbon black is a rubber reinforcing filler and the second rubber raw material after raw rubber. Carbon black is also used as a colorant, ultraviolet shielding agent, antistatic agent or conductive additive, and is widely used in many industrial products such as plastics, chemical fibers, inks, coatings, electronic components, leather chemicals, and dry batteries. Carbon black can also be used in metallurgy and carbon industries as high-purity carbon materials. It can be divided into two categories according to the application, namely rubber carbon and special carbon, and conductive carbon, is used in the field of conductive additive. The cost of raw materials such as coal tar accounts for 80%. From the perspective of cost structure, the cost of raw materials such as conductive carbon coal tar in China will account for 80.5% in 2022. The reason is that the international situation will be tense in 2021. China’s reduction in coal imports and the low operating rate under the dual-control policy of domestic coking plants will lead to tight supply and demand of tar, and the price of coal tar will rise by 61.46% throughout the year. The downstream application market is rich, and there are differences in upstream raw materials at home and abroad. From the perspective of upstream raw materials, the upstream of Chinese carbon is dominated by coal tar, and the upstream of other countries’ carbon is dominated by naphtha. From the perspective of downstream application markets, carbon is a reinforcing filler for rubber, second only to raw rubber. Two-bit rubber raw materials, while carbon can be used as colorant, UV shielding agent, antistatic agent or conductive additive, widely used in many industries such as plastics, chemical fibers, inks, coatings, electronic components, leather chemicals and dry batteries, carbon black as a high-purity carbon material, it can also be used in metallurgy and carbon material industries.
Production of carbon blackThe carbon black production process is the cracking of hydrocarbons under high temperature to generate carbon and hydrogen. At present, the commonly used it preparation methods include furnace method, bath method, thermal cracking method and acetylene method. Among them, the most commonly used conductive carbon black SUPER P Li (SP for short) is mainly prepared by furnace method, and the mainstream production process of conductive carbon is mainly for the furnace process and acetylene cracking method.
- Furnace carbon black
- Acetylene carbon black
Conductive carbon black for lithium batteriesConductive carbon products for lithium batteries are significantly differentiated, and the performance gap is large. Low specific surface area, high oil absorption value, and low metal ion content are the core technical indicators for the successful application of conductive carbon.
- Particle size and specific surface area
- Branched chain structure
- DBP absorption
- Surface functional groups
- Metal ion content
- SP conductive carbon black
- Ketjen black
- Acetylene carbon black