The Study On Preparation Technique And Cycling Life Of 12V Pb-C Ultrabattery

The Ultrabattery is a new hybrid energy storage device which is made with supercapacitor material and battery material. The supercapacitor material acts as a buffer during high-rate charging and discharging, thus it has great advantages in terms of high specific power and long cycling life to general lead-acid battery, which enabling to provide and absorb charge rapidly when electric vehicle acceleration and braking.This article is on the basis of ultrabattery duality plate new concept, studied the influence of different graphite, acetylene black, hydrogen evolution inhibitors, internal parallel configuration and mixing paste techniques on the ultrabattery electrochemical and cycling performance, and made comparison with general lead-acid battery.First, using titanium plate as current collector to study the electrochemical and cycling performance of the carbon negative plate with different grahite and hydrogen evolution inhibitors. The results of Cyclic Voltammetry, Chronoamperometry and constant current charge-discharge tests indicated that adding 10 mass% acetylene black, 5 mass% spherical graphite, 1.5 mass% Ga2O3 and 1.5 mass% barium stearate as hydrogen evolution inhibitors to prepare the asymmytric capacitor, which negative material had a discharge specific capacity of about 110 mAh·g^-1 and the ESR of capacitor was 4.5Ω·cm2. Using lead grid as current collect to prepare the PbO₂/C asymmetric capacitor, first discharge specific capccity of negative material was 142mAh·g^-1,after 350 cycling times still had 98 mAh·g^-1.Then discussed the influence of different lead-carbon area ratios and configuration structures, the results indicated that cell assembled with internal parallel 3:1 area ratio negative plates had longer cycle-life of 2 230 under electric vehicle micro-hybrid operation mode. The cell assembled with lead-carbon number of Pb:C=4:4 negative plates had cycle-life of 2 101.Then assembled 12V/10Ah ultrabattery to study the influence of different graphite and mixing paste techniques on the ultrabattery. The results ensured that adding spherical graphite could improve the discharging capacity and cycling life, all the results verified the experimental results on the titanium plate. The different mixing paste techniques experiments demonstrated that the cycling life of ultrabattery with wet mixing paste battery was 6 972 under electric vehicle mild-hybrid operation mode, much longer than dry mixing paste ultrabattery of 2 437. The SEM,XRD and EIS images indicated that negative plate prepared by wet mixing paste technique had smaller particle size, the spongy lead had good crystallization and much smaller Rct.In the end, compared the cycling performance of 12V/10Ah ultrabattery with general lead-acid battery, the results showed that discharge potential of ultrabattery declined slowly, cycling life was 11 947, which was 5 times longer than general lead-acid battery under electric vehicle mild-hybrid operation mode.