Q&A session on the production process of soft pack full battery

Question1：Is CMC a surfactant?

Answer：CMC is not a surfactant in the strict sense, it is mainly used as a thickener, but it can change the wetting effect of graphite and water.

Question2：Can CMC be replaced by other substances?

Answer：Currently,?CMC is commonly used, and there are other alternatives, but the effect is not as good as this, such as PAA.

Question3：What is a secondary particle?

Answer：The secondary particle is the particle that is a combination of many flakes of graphite.

Question4：In the process of scientific research, grinding or magnetic stirring is generally used, does this have a big impact? ”

Answer：Ball milling is not recommended. It is best to stir it with magnetic force.

Question5：What is the relationship between the solid content and viscosity of the anode?electrode and the proportion of active materials?

Answer：The solid content of the anode?electrode is generally ~48%, according to the material and formula are different, the viscosity is generally controlled at 1500~4500, of course, the less the amount of adhesives such as CMC and SBR, the better, and the energy density is improved.

Question6：Why the less CMC, the higher the energy density?

Answer：Because CMC cannot provide energy, the energy density can be increased because it gives this part of the energy to the active material.

Question7：What is the effect of a low or high amount of SBR on the slurry?

Answer：If SBR is added too little, it will not be effective as an adhesive and may cause powder to fall off; if it is added too much, the conductivity is poor, which affects the rate performance of the battery.

Question8：What is the general temperature range of drying temperature?"

Answer：The baking temperature in the industry is generally 70~90°C, which is adjusted according to the length of the oven of the coating machine.

Question9：Do anode electrodes require the addition of conductive agents?

Answer：There are also anode?electrodes that do not add conductive agents, because graphite itself has better conductivity.

Question10：Can modified PAA be used on carbon materials?

Answer：In silicon-carbon, a material with large volume expansion, modified PAA can exhibit better performance.

Question11：Why can't copper be used for lithium titanate anode, and can lithium titanate be used as cathode?electrode?

Answer：Lithium titanate can be used with copper, but because of its high potential, it will not alloy with lithium, and it can be done with aluminum foil.

Question12：Use coater, how thick is the general scraping?

Answer：If you use a scraper applicator, you need to use 10um or more copper foil, otherwise it will be easy to wrinkle.

Question13：Is solids content testing the detection of solids in a slurry? What is the specific significance of testing this? ”

Answer：The solids content is the amount of solid components. The easiest way to do this is to weigh it after drying; The solids content will affect the coating speed when it is applied later; The higher the solid content, the higher the coating speed and the higher the production efficiency (of course, under the premise that other factors are fixed).

Question14：What can be the problem with high solid?content?

Answer：If too?high, it can't be stirred when mixing, and the slurry is very viscous, and it can't be coated because it has no fluidity.