14 results about "Sulfur electrode" patented technology

The invention relates to a sodium-sulfur battery technology, and aims to provide a preparation method and application of a modified carbon-supported sulfur electrode material and a self-supporting sulfur electrode. The preparation method comprises the following steps: carrying out spray drying on a mixed solution containing aniline hydrochloric acid, ammonium persulfate hydrochloric acid and nano calcium carbonate to obtain a precursor, and carrying out carbonization and acid leaching to obtain a hydrophilic carbon carrier with primary and secondary pore channels; a positive plate is prepared to assemble a soft package battery, and potassium intercalation is realized through multiple times of potassium deintercalation and intercalation cycle treatment; disassembling and cleaning to obtain a potassium-embedded carbon carrier, reacting with transition metal nitrate, and forming monatomic transition metal clusters between graphite layers to enlarge the graphite spacing; removing potassium nitrate to obtain a modified carbon carrier which is provided with three-stage mass transfer channels and in which transition metal is loaded, then grinding and mixing the modified carbon carrier with elemental sulfur, performing heating treatment, and cooling to obtain the modified carbon sulfur-loaded electrode material. According to the invention, transition metal single atomic clusters are formed on the walls of the micropores while the interlamellar spacing of the graphite is enlarged to form the micropores, so that the cycling stability of the sodium-sulfur battery is effectively improved.

Described are electrodes composed of a carbonaceous matrix with sulfurized carbon particles. These particles feature sulfur atoms covalently bonded to carbon atoms, internal pores, and sulfur molecules both adsorbed and contained within these pores. The structure includes electrically conductive filaments and particle agglomerates fused to a subset of these filaments, which possess specific length and width dimensions and extend as anchor segments to connect adjacent particles. Additionally, the electrode incorporates yarns made from a second subset of filaments, characterized by lengths and widths exceeding those of the initial filaments, spanning between the particle agglomerates. The resultant electrode shows unique electrochemical behavior that enhances its energy density over other carbonaceous sulfurized carbon materials.

本发明涉及一种锂硫电极中硫化锂的品质分析方法，作为分析锂硫活性材料中残留锂化合物的方法，所述分析方法包括：准备包括正极活性材料的电极的步骤；对所述电极进行充放电，以获取关于随容量(Specific Capacity)变化的电压(Voltage)的第一数据的步骤；以及基于所述第一数据，通过对随所述电压(V)变化的电池容量(Q)对所述电压(V)的微分值(dQ / dV)进行积分，获取并分析根据计算出的面积值而得到的数据的步骤。

A sulfur electrode and a method for manufacturing the same are disclosed. The method for manufacturing the sulfur electrode includes: growing carbon fibers on a surface of stainless steel; connecting the stainless steel on which the carbon fibers are grown to a cathode of a current controller in an aqueous solution in which sulfur ions are dissolved; and forming a sulfur thin film on each of surfaces of the carbon fibers grown on the surface of the stainless steel and in each of spaces between the carbon fibers by controlling a current of the current controller.

The present invention relates to a sulfur electrode composition for a lithium-sulfur battery, comprising: a cellulose nanofiber binder; and an active material comprising sulfur. Thereby, the sulfur electrode for a lithium-sulfur battery of the present invention maximizes the utilization rate and conversion reaction rate of sulfur in a lithium-sulfur battery even under minimal electrolyte conditions by introducing cellulose nanofibers as a binder, and the distance between the expanded glucose chains formed due to the one-dimensional structure and electrostatic repulsion of the cellulose nanofibers promotes the interaction between the binder and lithium polysulfide (LiPS), and effectively suppresses the formation of aggregates of lithium polysulfide (LiPS). Therefore, a lithium-sulfur battery including such a sulfur electrode maintains a high active material ratio even under minimal electrolyte conditions while increasing the electrochemical conversion reaction rate, thereby improving battery performance and significantly increasing energy density.

A sulfur electrode and a method for manufacturing the same are disclosed. The method for manufacturing the sulfur electrode includes: growing carbon fibers on a surface of stainless steel; connecting the stainless steel on which the carbon fibers are grown to a cathode of a current controller in an aqueous solution in which sulfur ions are dissolved; and forming a sulfur thin film on each of surfaces of the carbon fibers grown on the surface of the stainless steel and in each of spaces between the carbon fibers by controlling a current of the current controller.

Cathode active material layers and methods are disclosed. The cathode active material layer includes a metal chalcogen, an electroactive sulfur conversion cathode material, and an electroactive selenium conversion cathode material. The cathode active material layer includes the metal chalcogen in a weight ratio (w / w) of between 5% and 75%, the electroactive sulfur conversion cathode material in a weight ratio (w / w) of between 15% and 75%, and the electroactive selenium conversion cathode material in a weight ratio (w / w) of between 2% and 25%.

The invention discloses a composite fiber and a preparation method and application thereof. The composite fiber comprises a polymer fiber, a sulfur layer attached to the surface of the polymer fiber and a first conductive agent layer attached to the surface of the sulfur layer; wherein the polymer fiber is treated by air plasma. In the composite fiber, the polymer fiber provides ion conduction performance, the first conductive agent layer provides electron conduction performance, rapid transmission of electrons and ions can be promoted through the synergistic effect of the polymer fiber and the first conductive agent layer, and oxidation-reduction reaction kinetics of sulfur can be accelerated as a battery positive electrode material. The composite fiber disclosed by the invention is subjected to shearing treatment, is mixed with a conductive agent dispersion liquid, and is subjected to vacuum filtration, so that a continuous conductive network is formed, and finally, the flexible self-supporting sulfur positive electrode is constructed. The flexible self-supporting sulfur electrode has excellent electron and ion transmission capability, can effectively inhibit the shuttle effect of LiPSs, can improve the wettability with an electrolyte, and has excellent mechanical stability.

The invention belongs to the technical field of aqueous secondary batteries, and particularly relates to a preparation method of an electrolyte and application of the electrolyte in a zinc-sulfur secondary battery, the electrolyte is composed of ultrapure water, an amide organic solvent, a soluble zinc salt electrolyte and an iodine-containing additive; wherein the iodine elementary substance or zinc iodide of the iodine-containing additive can serve as a redox medium to promote electrochemical oxidation of ZnS in the charging process of the zinc-sulfur secondary battery; the mixed system of the amide organic solvent and the ultrapure water is adopted, so that the wettability of the sulfur electrode can be effectively improved, the sulfur conversion reaction kinetics can be improved, the water activity in the electrolyte can be reduced, the hydrogen evolution side reaction can be inhibited, the dendritic crystal formation of the zinc metal negative electrode can be prevented, and the cycling stability of the zinc-sulfur secondary battery can be remarkably enhanced; the electrolyte provided by the invention is low in cost, efficient and environment-friendly, and has important significance on large-scale application of high-performance zinc-sulfur secondary batteries.

The invention discloses a composite hydrogen evolution electrode and a preparation method thereof, the composite hydrogen evolution electrode comprises a nickel substrate, the nickel substrate is provided with a nickel-sulfur alloy layer, and the nickel-sulfur alloy layer is loaded with a copper element. The preparation method comprises the following steps: placing a nickel substrate in an electroplating solution containing a nickel source and a sulfur source for electrochemical deposition, and forming a nickel-sulfur alloy layer on the nickel substrate; activating the nickel substrate on which the nickel-sulfur alloy layer is formed; and placing the activated nickel substrate in a copper plating solution for electroplating to obtain the composite hydrogen evolution electrode. The nickel-sulfur alloy is deposited on the nickel substrate, the nano-copper is deposited on the surface of the nickel-sulfur alloy, the hydrogen evolution performance of the nickel-sulfur electrode is improved by introducing the copper element, and the stability is enhanced while the overpotential is reduced.

A lithium-sulfur secondary battery containing a positive electrode or a negative electrode containing a sulfur-containing electrode active material containing at least one selected from the group consisting of simple sulfur, lithium polysulfides (Li2Sn: 1≤n≤8) and organosulfur compounds, wherein the lithium-sulfur secondary battery contains an electrolytic solution containing a fluorinated ether and an ether compound, where the fluorinated ether and the ether compound in total is 80% by weight or more of a solvent in the electrolytic solution.

The invention provides an all-solid-state lithium-sulfur battery. The all-solid-state lithium-sulfur battery comprises a first coating layer, a second coating layer, a solid electrolyte layer and a lithium negative electrode, the first coating layer is a positive electrode layer with excellent electronic conductivity and comprises a sulfur positive electrode active material, a conductive agent, sulfide electrolyte and a binder, and the content of the conductive agent is relatively high; the second coating layer is a composite positive electrode-electrolyte layer with excellent ionic conductivity, and comprises a sulfur positive electrode active material, a conductive agent, a sulfide electrolyte, a lithium salt and a binder; the solid electrolyte layer is composed of a polymer electrolyte, a lithium salt and an additive. According to the all-solid-state lithium-sulfur battery and the preparation method thereof provided by the invention, the electronic conductivity and the ionic conductivity of a sulfur electrode are improved, meanwhile, the problem of poor contact between a positive electrode interface and electrolyte is solved, a reaction energy barrier in a sulfur charge-discharge process is greatly reduced, and the charge-discharge rate of the all-solid-state lithium-sulfur battery is improved.

The present invention belongs to the field of electrochemical energy storage, and relates to a composite sulfur electrode material, a preparation method thereof, and an application thereof. The composite sulfur electrode material uses a two-dimensional lamellar material as a matrix, and one-dimensional carbon nanotubes are in-situ grown on metal sites to form a two-dimensional-one-dimensional composite material. Sulfur is coated on the inner and outer walls of the carbon nanotubes and embedded in the gaps formed by the intersection of the carbon nanotubes. The two-dimensional-one-dimensional composite material is a unified whole with one-dimensional carbon nanotubes growing on the two-dimensional lamella. The two-dimensional lamellar material is a single-layer or multi-layer lamellar compound, preferably a metal compound; the one-dimensional carbon nanotube is a hollow tubular structure with excellent electrical conductivity. The two-dimensional-one-dimensional composite material provided by the present invention can improve its electrical conductivity while ensuring the excellent performance of the two-dimensional lamellar material when used as a sulfur carrier, promote the transmission of electrons / ions, and provide sufficient space to load sulfur and relieve the volume expansion during charge and discharge, thereby optimizing its electrochemical performance in the field of metal-sulfur batteries.