5 results about "Inductive effect" patented technology

The invention relates to an electron withdrawing group terminated polyimide covalent organic framework material as well as a preparation method and application thereof. According to the invention, 4, 4 '-(hexafluoroisopropenyl) diphthalic anhydride and a tetra (4-aminophenyl) methane monomer are utilized to prepare a polyamic acid covalent organic framework, and 4-cyanophenyl, 4-aminotrifluorotoluene, 4-nitroaniline and 4-chloroaniline are utilized to perform end capping, so that the electron withdrawing group-terminated polyimide covalent organic framework material is prepared. The rich pore structure of the COF skeleton provides a rapid ion transport channel, the transport of current carriers is promoted, and the electron cloud density of the COF skeleton is adjusted through Lewis acidity formed by an end-capping electron withdrawing group through an induction effect, so that an electron-deficient domain is constructed. When being used in a lithium metal battery system, the material can guide uniform distribution of lithium ions and solve the problem of lithium dendrite growth; when the material is loaded on a lithium-sulfur battery positive electrode material, polysulfide can be pulled to move directionally to complete order reduction conversion reaction, so that the lithium-sulfur battery with long cycle life is obtained.

The present application relates to an electron-withdrawing group terminated polyimide covalent organic framework material and a preparation method and application thereof. The present application utilizes 4,4'-(hexafluoroisopropylidene)diphthalic anhydride and tetra(4-aminophenyl)methane monomers to prepare a polyamide acid covalent organic framework, and utilizes 4-aminobenzonitrile, 4-amino-trifluorotoluene, 4-nitroaniline and 4-chloroaniline to perform termination, thereby preparing an electron-withdrawing group terminated polyimide covalent organic framework material. The rich pore structure of the COF framework provides a fast ion transmission channel, promotes the transport of carriers, the Lewis acidity formed by the end-capped electron-withdrawing group adjusts the electron cloud density of the COF framework through an inductive effect, and an electron-deficient domain is constructed. In a lithium metal battery system, it can guide the uniform distribution of lithium ions, solve the problem of lithium dendrite growth; when loaded on a lithium-sulfur battery positive electrode material, it can lead the directional movement of polysulfides to complete the down-order conversion reaction, thereby obtaining a lithium-sulfur battery with long cycle life.

This application relates to the field of secondary battery technology and discloses a battery in which the positive electrode active material is nickel-doped lithium cobalt oxide, with a nickel content (a%) of 0.01% to 0.3% by mass; the electrolyte contains 1,2,4-butanetrionitrile and a carboxylic acid ester compound, with a mass content (b%) of 0.05% to 5% and (c%) of 5% to 60%. This application achieves high energy density by increasing the positive electrode operating voltage through nickel doping. Simultaneously, it utilizes the small-molecule polycyano group characteristics of 1,2,4-butanetrionitrile to rapidly diffuse to the positive electrode surface and preferentially form a film, effectively complexing high-valence nickel ions and passivating their catalytic activity. Furthermore, the strong electron-withdrawing inductive effect of the cyano group reduces the highest occupied molecular orbital energy level of the carboxylic acid ester, enhancing its intrinsic antioxidant capacity, thereby improving the battery's cycle stability and achieving a synergistic improvement in energy density, cycle life, and kinetic performance.

A novel Au@OTf-P5 composite optoelectronic material, its preparation method, and its application are disclosed, belonging to the field of photoelectrochemical technology. This material uses gold nanoparticles as the core carrier, and an OTf-P5 layer is modified onto the Au surface using self-assembly technology. A highly sensitive PEC sensing system is constructed using Au@OTf-P5 as the photoactive recognition unit for the specific detection of superoxide anions. The excellent conductivity and LSPR effect of Au nanoparticles serve as signal transduction. The unique electron-rich structure of the OTf-P5 cavity and the inductive effect of the trifluoromethanesulfonate groups achieve specific host-guest complexation and capture of superoxide anions. This complexation affects electron transport or alters the interface energy level, thereby enabling quantitative analysis of the target analyte through a signal-on-off or on-off mode of the photocurrent signal. This composite electrode exhibits a wide linear range, low detection limit, and excellent anti-interference capability when detecting superoxide anions.

A method for preparing a self-assembled small-molecule ammonium salt material and its application in perovskite solar cells, relating to the field of perovskite photovoltaic technology, wherein the chemical structural formula of the passivation material is: This material, used as a surface passivator for perovskite thin films, improves perovskite crystallization and reduces its susceptibility to humidity. Furthermore, due to its inductive effect, the electron-withdrawing properties of fluorine atoms and carbonyl groups reduce carrier transport losses. In addition, this passivation material is simple to prepare, has high yield, and low cost, making it a high-performance optoelectronic material. When used as a passivation layer in perovskite solar cells, it achieves a photoelectric conversion efficiency exceeding 23.91%.