Why is the internal resistance of lithium-ion batteries too large?

(1) There are too few conductive agents in the positive electrode ingredients (the conductivity between materials is not good, because the conductivity of lithium ion cobalt itself is very poor) (2) There are too many binders in the positive electrode ingredients (binders are generally polymer (Data, strong insulation function) (3) Too much binder in negative electrode ingredients (binders are generally polymer materials with strong insulating function) (4) The ingredients are loose and uneven (5) The binder solvent is not in the ingredients. Completely (not completely soluble in NMP and water) (6) The surface density of coating drawing is too large (the ion migration interval is large) (7) The compaction density of the lithium ion battery is too large, and the roller compaction is too compact. (Rolling is too dead, and some of the active material structure is destroyed) (8) The positive electrode lug is not welded firmly, showing a virtual weld (9) The negative electrode lug is not welded or riveted firmly, showing a virtual weld, and the unsoldering (10) winding is not Tight, loose coil core (increasing the gap between the positive and negative plates) (11) The positive electrode lug and the shell are not welded firmly (12) The negative electrode lug and the pole post are not welded firmly. 2. Materials (1) Positive electrode material resistance Large (poor conductivity, such as lithium iron phosphate) (2) Influence of barrier data (thickness of barrier, small porosity, small pore size) (3) Influence of electrolyte data of lithium ion battery (small conductivity, high viscosity) (4) Influence of positive PVDF data. (The amount is large or the molecular weight is large) (5) The influence of the positive electrode conductive agent data. (Poor conductivity, high resistance) (6) The influence of the positive and negative electrode materials (the thickness is thin, the conductivity is poor, the thickness is uneven, and the purity of the data is poor) (7) The copper foil and aluminum foil have poor conductivity or oxide on the surface statement: this site Some pictures and content of the published article are from the Internet. If there is any infringement, please contact to delete the previous article: Analysis of charging methods and precautions for lithium-ion batteries in electric vehicles