Design Synthesis And Application Of Silane-based Porous Organic Polymers

Rechargeable water zinc-ion batteries have gradually entered the hotspot of energy storage research due to their higher energy density and power density,as well as relatively low manufacturing costs and simple manufacturing processes.In the existing research,the development and preparation of cathode materials are particularly critical.Manganese and cobalt-based materials have been widely studied due to their advantages,such as simpler synthesis and high specific capacity.However,pure-phase inorganic metal materials have a wide range of problems,such as poor electrical conductivity and swelling after repeated cycles,which seriously affect the long-term and stable use of the overall battery system.In order to solve such problems,and the conductive carbon materials were introduced to the system,increase the conductivity of the composite materials,and improve the conductivity,so as to improve the cycle stability of the battery.The main contents of this paper are:?1?First,using silica microspheres as a sacrificial template,manganese dioxide was compounded with hollow nitrogen-doped carbon nano-microspheres to prepare hollow spherical manganese dioxide and nitrogen-doped carbon nano-microsphere composite cathode materials.It can improve the conductivity,structural stability and cyclic stability of manganese dioxide,and display a capacity of about 206 m A h g^-1 at a current density of 100 m A g^-1.After a large current density(500 m A g^-1)charge and discharge test,the capacity of about 103 m A h g^-1 can be retained after 650 cycles,and the capacity retention rate is about 98.3%.The outstanding electrochemical behavior is attributed to the synergistic effects of manganese oxide and hollow porous carbon nanospheres.These effects can be attributed to the large electronic modification interface of the composite,high-quality loading and stable carbon layer structure.?2?Taking a suitable amount of graphene material,a simple hydrothermal reaction was used to synthesize a precursor material of pentamanganese octaoxide in sheet grapheme.After calcination at high temperature in the air atmosphere,the graphene material was reduced,and the precursor material was oxidized to the pentamanganese octaoxide crystal material,and it was evenly distributed on the reducing graphene material.It shows excellent cycling performance at low current density(100 m A g^-1),and can maintain the capacity of 250 m A h g^-1 after 100 cycles,combined with the in-situ Raman,XRD and other testing methods for comparative analysis,Zn²⁺and H⁺co-embedding mechanisms provide reference for future exploration of cathode materials and in-depth study of reaction mechanisms.?3?A certain amount of an aqueous potassium permanganate solution was used to generate a precursor of trimanganese tetroxide under the action of concentrated hydrochloric acid,and then an appropriate amount of thiophene monomer was added to the mixture,and polymerization was performed at high temperature and pressure for 10hours to obtain a polythiophene composite rod-shaped tetroxide trimanganese composite,Due to the good conductivity of polythiophene materials and the easing of volume expansion,the composites show excellent cycle performance and small electron transfer resistance.At a current density of 100 m A g^-1,they can maintain 150 m A h g^-1after 100cycles.This strategy combines organic conductive polymers with metal inorganics,and provides guidance for future composite development.?4?A flower-like layer of cobalt manganate material was synthesized by hydrothermal reaction at high temperature and pressure.Considering that a single cobalt manganate material has poor conductivity and low ion mobility.The ion mobility in the material is low.The lamellar graphene material prepared by the hummers method is compounded,and the flower-like cobalt manganate material was based on the crystal growth of the graphene material.At a current density of 50 m A g^-1,there is still a capacity of 160 m A h g^-1.In composite materials,cobalt manganate provides corresponding capacity,while graphene materials increase the overall material's conductivity and stability.?5?In this article,we use mature manganese and cobalt-based materials as the main materials,and introduce conductive polymer and graphene into the system.While enhancing the stability of the main structure,increase the conductivity of the composite material and the contact of the electrolyte,and take into account the electrochemical performance and transmission mechanism research.Combined with ex-situ XRD,Raman and XPS patterns and other analytical methods to explore its transmission mechanism,it will lay the foundation for the future exploration of composite materials and the study of electrochemical mechanism.