What is the formula and process flow of lithium batteries?

　　The capacity of lithium-ion batteries will still decrease after repeated charging and discharging, and the reasons are complex and diverse. It is mainly the changes in the positive and negative materials themselves, which ultimately reduces the number of lithium ions in the battery that can move freely during charge and discharge.

　　1. Positive and negative electrode formula

　　1.1 Positive electrode formula: LiCoO2 + conductive agent + binder + current collector (aluminum foil)

　　LiCoO2(10μm): 96.0%

　　Conductive agent (CarbonECP) 2.0%

　　adhesive (PVDF761) 2.0%

　　NMP (increased cohesiveness): The weight ratio of solid matter is about 810:1496

　　A) Positive electrode viscosity control 6000cps (temperature 25 rotor 3);

　　B) The weight of NMP must be adjusted appropriately to meet the viscosity requirements;

　　C) Pay special attention to the influence of temperature and humidity on viscosity

　　Positive active material:

　　Lithium cobalt oxide: positive electrode active material, lithium ion source, to improve the lithium source for the battery. Non-polar substance, irregular shape, particle size D50 is generally 6-8μm, water content ≤0.2%, usually alkaline, pH value is about 10-11.

　　Lithium manganate: non-polar material, irregular shape, particle size D50 is generally 5-7μm, water content ≤0.2%, usually weakly alkaline, pH value is about 8.

　　Conductive agent: chain-like substance, water content <1%, particle size is generally 1-5μm. Superconducting carbon blacks with excellent conductivity are usually used, such as Ketjen carbon black CarbonECP and ECP600JD. Its role is to improve the conductivity of the positive electrode material, compensate for the electronic conductivity of the positive electrode active material, and increase the amount of electrolyte absorption of the positive electrode sheet. Increase the reaction interface and reduce polarization.

　　PVDF adhesive: non-polar substance, chain-like substance, molecular weight ranging from 300,000 to 3,000,000; after absorbing water, the molecular weight decreases and the viscosity becomes worse. Used to bond lithium cobalt oxide, conductive agent and aluminum foil or aluminum mesh together. Commonly used brands such as Kynar761.

　　NMP: weakly polar liquid, used to dissolve/swell PVDF, and at the same time to dilute the slurry.

　　Current collector (positive lead): made of aluminum foil or aluminum tape.

　　1.2 negative electrode formula: graphite + conductive agent + thickener (CMC) + binder (SBR) + current collector (copper foil)

　　Anode material (graphite): 94.5%

　　Conductive agent (CarbonECP): 1.0% (Ketjen superconducting carbon black)

　　Binder (SBR): 2.25% (SBR=styrene butadiene rubber latex)

　　Thickener (CMC): 2.25% (CMC = sodium carboxymethyl cellulose)

　　Water: The weight ratio of solid matter is 1600:1417.5

　　A) Negative electrode viscosity control 5000-6000cps (temperature 25 rotor 3)

　　B) The weight of the water needs to be adjusted appropriately to meet the viscosity requirements;

　　C) Pay special attention to the influence of temperature and humidity on viscosity