Perparation And Performances Of Nano Ruthenium Composite Eletrode Material

Since energy conservation a nd environmental protection has become a vit a theme today, along with the ra pid development of green energy, hybrid cars, electric cars and high-end consumer electronics produc ts, r equirements for power supply devices especially mobile power supply equipments are becoming more and more diverse.Power supply devic es are required t o have not onl y high ene rgy density but also high power densi ty to conventional capacitors. Unfort unately, batteries c an no longer meet the requirements of new electronic devices. A new type of gr een e nergy storage components-supe r capacitor s, whi ch have a high power density a s conventional ca pacitors do and out st anding merits of or dinary batteries’ high energy density, are being widely used in high-tr affic areas of energy, smart grid, defense weapons and other fields. With the continuous i mpr oveme nt of supercapacitor per formance, batteries could be completely r epla ced in the future in fields such as low- power devices, new energy and other green ar eas the refore supercapacitors has broad application prospects.With ruthenium oxi de as objects, In t his thesis, we ha ve s tudie d different methods to prepare RuO2-bas ed composite electrode ma terials with differ ent syst ems, including RuO2/CuO composite el ect r ode mat erials, RuO2/AC composite elect rode materials,RuO2/MnO 2 composit e electrode materi als, and they wer e characterized by SEM, XRD,TGA. The ele ctrochemical per formance of composi te el ectr ode mat eria ls were revealed by Cyclic voltammet ry(CV), Galvanostatic charge-dis charge( GCD), Electrochemical impe dance spectroscopy(EIS). The main contents are as follow:1. Amor phous hydrous nano rutheni um oxide and copper oxide powder ar e prepared by a sol-gel process and a low temperature solid-state reaction, re spectively.Electrochemical performances of the ruthenium oxide/copper oxide c omposite elect rode materials were studied i n different elect rolytes, binder, el ect r ode-forming pressure. The results show that composite electrode have the best e lectrochemical properties with s pecific capacitanc e up to 643F/g, equivalent series resistance is 0.12Ω and capacitance retain about 81.3% after 1000 cycles in the c ondition of composite electrode wit h30%(mass fraction) copper powders, 2mol/L KOH as electrolytes, binder PVDF l oading as 7% and elect r ode-forming pre ssure a t 10 MPa.2. Ruthenium oxide/act ive carbon composite el ectr ode ma terials were prepa red bythe l iquid deposi tion me thod. Elect rochemical properties of composit e electrode were s tudie d, whi ch a dded different conductive agent. The results show that it can improve the conductivity by added with ac tive carbon. When the active carbon cont ent of 30%and CNTs as conductive agent, the composit e materials showed exc ell ent electrochemical performa nce, and its s pecific capacitance and e quivalent series resistance are 689F/g and 0.19Ω, respectively. In addition, 800 charge-discharge cyc les,the capac ity c an still remain stable.3. MnO2 nano fibrous electrode material was pre pared by hydrothermal synt hesis method. The diameter of nano-fibrous i s about 100 nm and the length is about 1.5 μ m.The ruthenium oxide cont ent of 60% was investigated. The results show that composite el ectrode spe ci f ic capac itance is 352F/g at current densi ty of 4mA/cm2, af ter 500 cycles,the capac ity c an still kept at 85.3%.