18650 lithium rechargeable battery

　　Lithium-ion battery negative electrode mixing process

　　Lithium battery negative electrode mixture graphite: the anode active material is the main material for the anode reaction; it is mainly divided into two categories: natural graphite and artificial graphite. Non-polar substances, easily polluted by non-polar substances, easily dispersed in non-polar substances; it does not easily absorb water or disperse in water. When the contaminated graphite is dispersed in water, it tends to

　　Lithium-ion battery negative electrode mixture

　　Graphite: anode active material is an important material for anode reaction; it is mainly divided into two categories: natural graphite and artificial graphite. Non-polar substances, easily polluted by non-polar substances, easily dispersed in non-polar substances; it does not easily absorb water or disperse in water. Contaminated graphite tends to re-agglomerate when dispersed in water. The general particle size D50 is about 20 cm. The particle shapes are various and irregular, mainly spherical, flake, fibrous and so on.

　　Conductive agent: its function is:

　　A) Improve the conductivity of the negative electrode sheet to compensate the conductivity of the negative electrode active material.

　　B) Improve reaction depth and utilization.

　　C) Prevention of dendrite formation.

　　D) Use the absorbability of conductive materials to improve the reaction interface and reduce polarization. (Optional with or without graphite particle size distribution).

　　Additives: reduce irreversible reactions, improve adhesion, increase paste viscosity, and prevent paste precipitation.

　　Thickener/Anti-Sedimentation Agent (CMC): Polymer, soluble in water and polar solvents.

　　Isopropanol: a weak polar material, which can reduce the polarity of the glue and improve the compatibility between graphite and glue; it has a strong defoaming effect. It is easy to catalyze the cross-linking of glue network and improve the bonding strength.

　　Ethanol: a material with weak polarity. After adding, it can reduce the polarity of the glue and improve the compatibility between graphite and glue; it has a strong defoaming effect. It is easy to catalyze the linear crosslinking of the adhesive to improve the bonding strength (isopropanol and ethanol are basically the same, and you can choose which one to add in consideration of cost factors during mass production).

　　Water-based adhesive (SBR): Graphite, conductive agent, auxiliary agent and copper foil or copper mesh are bonded together. Small molecular linear emulsion, easily soluble in water and polar solvents.

　　Deionized water (or distilled water): Diluent, added appropriately to change the fluidity of the slurry.

　　Negative lead: made of copper foil or nickel strip.