| Titanium sub-oxides conductive ceramic with excellent electrical conductivity, strong chemical stability and wide electrochemical stable potential window, which have good prospects in a variety of batteries. Zn/Ni batteries has become a focus for researchers due to its high theoretical specific energy, high specific power, low cost and no environmental pollution. However, its widespread application is hindered by short cycle lives. The research shows that short cycle life of the Zn/Ni batteries was mainly due to the inherent defects of the Zn electrode, such as shape change, zinc dendrite growth, zinc self-corrosion and passivation. Therefore, in order to solve the problems of the Zn electrode, the present work researched the influence of titanium sub-dioxide conductive ceramic as Zn electrode conductive additives on performance of Zn/Ni batteries. In addition, titanium sub-dioxide conductive ceramic used in semi-solid flow Zn/Ni batteries were also studied.Titanium suboxide conductive ceramics as conductive additive was added to Zn electrodes, and the Zn electrodes were studied through some tests, including cyclic voltammetric curve test, Tafel curve test, potentiostatic polarization curves test and electrochemical impedance spectrum. The results showed that the titanium sub-oxide conductive ceramics can improve reversibility and corrosion resistance of Zn electrode. Compared with the Zn electrode with no conductive additive, the inhibition efficiency of Zn electrode with titanium sub-oxide conductive ceramics was94.2%, and the zinc dendrite was effectively inhibited. Added different content of titanium sub-oxide conductive ceramics to Zn electrodes, the results showed that with the increasing of the content of titanium oxide conductive ceramic in Zn electrodes, the electrochemistry performance of Zn electrodes were improved.The Zn electrode with different conductive additive were assembled Zn/Ni batteries, and tested its performance. The results showed that Zn/Ni batteries with conductive ceramic had better cycle performance and higher discharge capacity. The initial discharge capacity of Zn/Ni battery was459mAh/g, higher than that of the Zn/Ni batteries with acetylene black and without conductive additive. During50cycles, the discharge capacity was very stable. Meanwhile, the midpoint discharge voltage increased and discharge resistance decreased. Zn electrodes with different content of conductive ceramic were assembled Zn/Ni battery and tested its performance. The results showed that with the conductive ceramic content increased, the Zn/Ni battery charge/discharge performance was improved.Titanium sub-oxides conductive ceramic were added to the electrolyte of semi-solid flow Zn/Ni battery. The effect of ratio of titanium sub-oxide conductive ceramic and zinc oxide, and content of zinc oxide in electrolyte were studied. The results showed that with the increase of titanium sub-oxide conductive ceramics in semi-solid suspension, the discharge capacity and discharge voltage platform of semi-solid flow Zn/Ni battery was increased. When the ratio increased to1:4and above, the semi-solid flow Zn/Ni battery discharge efficiency reached to85%. The increased ratio of solid material in the semi-solid suspensioncan also can improve the discharge performance of the semi-solid flow Zn/Ni battery. The charge/discharge tests of semi-solid flow Zn/Ni battery was performed with different current. When the charge/discharge current was20mA and40mA, the discharge efficiency was90%; When charge/discharge current increased, the discharge capacity of semi-solid flow Zn/Ni battery decreased, and the discharge capacity decreased more obvious. The cycle behavior of semi-solid flow Zn/Ni battery was tested. In50cycles, the discharge capacity of the semi-solid flow Zn/Ni battery was very stand the discharge efficiency was more than90%. This indicates that the semi-solid flow Zn/Ni battery has good cycling performance and high discharge efficiency. |
PDF Full Text Request