Experimental Studies Of Additives For High Performance Copper Foil

Electrolytic copper foil is extensively used in printed circuit board（PCB）and lithium-ionbatteries. Additives are of great importance to get the high performance copper foil （HPCF）.However, the key technology of additives is mainly monopolized by the foreign countries. Inthat case, exploring the high performance additives with simple compositions is necessary tothe quick development of our native industry of electrolytic copper foil. This paper aims atdeveloping the satisfactory additives for HPCF, researching the determination method ofgelatin、PEG and cupric ion, and studying the mechanism of SPS. The major contents are asfollows.1. Additives for standard copper foils were studied. Three group additives were chosen tobe applied in producing standard copper foils. The properties of obtained products exhibitedgood performance with similar crystal grain.2. Additives for mirror-brightness copper foils were researched. Four group additives wereproved to be effective to meet the demanding properties of foil.3. The concentration of gelatin and PEG were determined. UV-visible was used withdifferent indicator, that is, Coomassie brilliant blue G-250for gelatin and KI-I2for PEG. Bothexperiments got linear standard curves. The linear correlation coefficients of standard curvesare0.9956and0.9928respectively for gelatin and PEG.4. The method of detecting the concentration of cupric ion in the electrolyte was explored.The electrodynamic potential of Hg（l）︱Hg₂Cl₂（s）, KCl（saturated）‖CuSO₄（c）︱Cu（s） wasfound to be correlative with the logarithm of cupric ion concentration. The linear correlationcoefficient is0.9923, which promises good linear relationship.5. The effect of bis-（3-sodiumsulfopropyl disulfide） was examined in the absence of H2SO4by electrochemical methods. It is found that the exposed effect of SPS is the result ofcompetition between adsorption and the formation of cuprous thiolate. The accelerating effectcoming from coordination is much stronger than the inhibited effect from the adsorption. So,the accelerating effect was found when SPS was added into the electrolyte.