Modification And Performance Of Ferrates As Cathode Of Super-iron Battery

In this paper, the electrochemistry of ferrates was summarized. Based on the research on super-iron battery, the synthesis and stability of the modified ferrates as the cathode materials for super-iron battery were studied. In the experiments, K2FeO4 was synthesized by an improved hypochlorite oxidation; influence of the crystalline growth velocity on discharge performance of super-iron battery was studied. Chromate method was used to determine the purity of K2FeO4. The structure of K2FeO4 was examined by XRD and FTIR. The experimental results indicated when the temperature of the bath slot refrigeration control in -10℃, the discharge performance of K2FeO4 was the best.Influence of additive soluble salts and alkaline oxide on discharge performance of super-iron battery was studied, the results showed the discharge efficiency of K2FeO4 added A was superior to Na2MoO4 in solution, and the one added 10wt% sodium silicate could reach 67.4%; compared with TO2, the discharge efficiency of K2FeO4 added B was better in solution, the one added 10wt% B could reach 63%.The mixed additives were made of MnO2, ZrOCl2 and C, it was explored deeply that influence of adding the mixed additives on discharge performance of super-iron, and production of discharge was examined by XRD. The results showed the discharge efficiency of K2FeO4 with adding the mixed additives was improved from 56.4% to 70%, the discharge platform was improved from 1.6V to 1.7V, and voltage was attenuated slowly.The system was composed of graphite, MnO2, ZrOCl2, C and K2FeO4, it was studied deeply that influence of different ratio component on discharge performance of super-iron battery. The results showed the best additives of graphite, MnO2, ZrOCl2, C were 22wt%, 10wt%, 6wt%, 0.15wt%, the highest efficiency discharge of modified K2FeO4 could reach 78.6%.Furthermore, BaFeO4 was modulated by adding different additives so that we could find a additive which was able to enhance the stability of BaFeO4, discharge capacity of the battery and the best proportion of additive. Findings showed that the purity of BaFeO4 combined with D declined from 93.4% to 90%, only 4.7%, the best additive of D was 0.86wt%; the characterization of modified BaFeO4 did not change very markedly.In the test of discharge, influence of D on the stability of BaFeO4 and discharge performance was studied. Findings showed that discharge efficiency of super-iron battery taking BaFeO4 which combined with D as cathode material was improved from 88.8% to 90.1%, D could enhance the stability of BaFeO4 and discharge performance.