Research On The Application Of Metal-Organic Complexes Based Nanomaterials In Flexible Zinc-Silver Battery

With the advances of science and technology,wearable electronic devices such as health detectors and flexible mobile phones are playing increasingly important role in our life.Therefore,the development of flexible electrochemical energy storage devices is deemed to be pivotal in promoting the bloom of wearable electronic devices.Zn-Ag battery is one of the most promising flexible energy storage devices due to the higher energy density,ultrastable output voltage and environmentally benign.Even though some milestones were established to further improve the performance of flexible Zn-Ag battery systems,there are still some unresolved troubles in flexible and wearable Zn-Ag battery.The first problem is most of substrates employing semi-flexible and high-density metal substrates such as nickel,titanium and zinc metal,severely restrainting their applications in flexible wearable and portable electronics.The second problem is the introduction of binder leading to the low utilization of active substances.The third drawback is relatively poor cycling performance due to the migration of Ag ions.The purpose of this dissertation is to design and research the high-performance active electrode substances and exploit new structures based on the derivatives from metal organic complexes(MOF)for solving the problems of aqueous Zn-Ag battery in wearable electronics application,achieving the high-performance of flexible aqueous Zn-Ag.(1)We fabricated MOF derived Ag nanowires on flexible carbon cloth(CC)free of any binder as a novel cathode for application in aqueous quasi-solid-state rechargeable Zn-Ag batteries.The fabricated quasi-solid-state Zn-Ag battery with a high areal capacity of 1.245 mAh/cm2.Furthermore,our prepared Zn-Ag battery can be charged by a flexible solar cell.Thus,the successful attempt of the solar-charged Zn-Ag battery paves the way for the design of clean energy powered wearable and portable electronics.(2)We constructed a long durability,flexible,fiber-shaped,aqueous quasi-solid-state rechargeable Zn-Ag battery with CNTF-NCA-Ag2O@PEDOT:PSS cathode,CNTF-Zn anode and PVA/KOH gel electrolyte.The as-prepared Zn-Ag battery with a remarkable capacity of 1.03 mAh/cm2.What’s more,the device also shows an admirable electrochemical durability(79.5%retention after 200 cycles).The successful attempt of a fiber-shaped Zn-Ag battery integrated with wind generator informs the design the next-generation of wind energy powered renewable energy storage devices for wearable electronics.(3)We designed the first-prototype high-performance,flexible,fiber-shaped,neutral,quasi-solid-state,rechargeable Zn-Ag battery with an open circuit voltage of 1V by adopting CNTF-NCA-Ag as cathode,CNTF-Zn as anode and ZnCl2 as neutral electrolyte.Owing to the Cl-restraining the migration of Ag+,the as-made mild Zn-Ag battery exhibits an excellent durability of 90%for 4000 cycles.Morveover,the device also has excellent flexibility with capacity conservation of 92%after stretching at a strain of 150%for 2000 cycles.(4)A high-performance,flexible,fiber-shaped,aqueous rechargeable Zn-Ag/Ni hybrid battery was constructed by employing CNTF-NCA-Ag2O/Ni(OH)2 as cathode,CNTF-Zn as anode.Benefiting from the binder-free electrodes and two types of active substances(Ag2O and Ni(OH)2),the as-prepared Zn-Ag/Ni hybrid battery dispalys a high specific capacity of 2.2 mAh/cm2 with an output voltage of 1.76 V.Furthermore,the fabricated device also exhibits good flexibility that the capacity retention of 75.3%after bending for 1000 cycles.