12results about How to "High reversible specific capacity" patented technology

This invention belongs to the field of hard carbon technology, specifically relating to a bamboo-based and lignin-based hard carbon composite material, its preparation method, and its applications. The process involves pretreating raw materials to obtain pretreated material; pretreating the pretreated material with an acidic oxidant to obtain acidic oxidant pretreated material; pre-oxidizing the acidic oxidant pretreated material to obtain pre-oxidized material; pre-carbonizing the pre-oxidized material under a protective atmosphere to obtain pre-carbonized material; pulverizing the pre-carbonized material to obtain pulverized material; acid washing followed by water washing to obtain purified material; soaking the purified material in acid, filtering, and drying to obtain soaked material; mixing the soaked material with a modifier, and high-temperature coating and carbonizing under a protective atmosphere to obtain bamboo-based coated hard carbon or lignin-based coated hard carbon. Mixing the two types of hard carbon and carbon coating yields a bamboo-based and lignin-based hard carbon composite material, which is used in negative electrode sheets and batteries. When applied to batteries, the hard carbon composite material of this invention can improve battery energy density.

This invention provides a road petroleum asphalt-based hard-soft carbon composite material, the raw materials of which include road petroleum asphalt, light component small molecule stabilizer, heavy component small molecule oxidant, activator, and solvent; and the ratio of road petroleum asphalt:solvent:light component small molecule stabilizer:heavy component small molecule oxidant:activator is 1:15-25:0.05-0.2:0.05-0.2:2-5, calculated in g / mL / g / g / g. Furthermore, this invention also provides a method for preparing the aforementioned hard-soft carbon composite material, which includes the following steps: crosslinking treatment of the light component, crosslinking treatment of the heavy component, activation, and carbonization. This invention solves the problem in the prior art where the high price or low carbon yield of hard carbon precursors, high cost of oxidants, or complex overall formulations lead to high costs for the prepared asphalt-based sodium-ion battery anode carbon materials. The hard-soft carbon composite material of this invention not only has a lower cost but also combines the advantages of both hard and soft carbon, exhibiting high sodium storage capacity, high reversible specific capacity, high initial charge-discharge efficiency, and good cycle performance.

The invention discloses a lead thiophosphate composite nitrogen-doped carbon porous microsphere material as well as a preparation method and application thereof, and belongs to the technical field of electrochemical energy storage materials. The preparation method of the lead thiophosphate composite nitrogen-doped carbon porous microsphere material comprises the following steps: dissolving a lead salt in an organic solvent, dissolving 2-methylimidazole in water, mixing the two solutions, carrying out solvothermal reaction, separating out a product, and reacting with a gas-phase sulfur source and a phosphorus source under the protection of inert gas to obtain the lead thiophosphate composite nitrogen-doped carbon porous microsphere material. The lead thiophosphate composite nitrogen-doped carbon porous microsphere composite material is obtained. According to the invention, a metal organic framework template method and a chemical vapor deposition method are ingeniously combined, and a brand new path for controllably preparing the lead thiophosphate composite nitrogen-doped carbon porous microsphere material is provided. When the prepared lead thiophosphate composite nitrogen-doped carbon porous microsphere material is used as a sodium ion battery negative electrode, a porous microsphere negative electrode formed by compounding lead thiophosphate and nitrogen-doped carbon shows remarkably improved electrochemical performance.

The application provides a high-capacity and high-rate hard carbon negative electrode material and a preparation method and application thereof, and belongs to the technical field of sodium ion battery negative electrode materials. Specifically, biomass shell raw materials are coarsely broken and sieved to obtain biomass coarse powder; the biomass coarse powder is mixed with an oxidizing agent and then pre-oxidized; mechanical pulverization is performed to obtain biomass coarse powder with a D50 of 8-15 microns; the biomass coarse powder is added into mixed acid and heated in a water bath, and then washed with water until neutral to obtain a purified precursor; and finally, the precursor is subjected to staged high-temperature carbonization in a vacuum carbonization furnace. Through specific process parameters, the prepared hard carbon material has a hierarchical porous structure and a suitable graphite microcrystalline layer spacing, and has a low total content of metal impurities; when applied to a sodium ion battery negative electrode, the hard carbon material exhibits a high reversible specific capacity, a high initial coulombic efficiency, and excellent long cycle stability and rate performance.

This invention relates to the field of secondary battery technology, and discloses an inorganic superionic conductor material, its preparation method, and its applications. The inorganic superionic conductor material comprises apatite and dopant ions doped into the apatite; wherein the dopant ions include metal cations and non-metal anions. The inorganic superionic conductor material provided by this invention can be used as a modified filler to achieve synergistic effects on electrolyte mechanical and electrochemical performance. Simultaneously, it can be introduced as a modifier into iodine cathodes to activate the 4-electron reaction of the iodine cathode, and introduced into bromine cathodes to stabilize the redox reaction of bromine, reducing bromine loss, thereby significantly improving the capacity and cycle stability of the full battery. Furthermore, by using 3D printing technology, screen printing, digital light processing, and fused deposition modeling, the inorganic superionic conductor material can be assembled with interdigitated positive and negative electrodes into flexible batteries, exhibiting excellent application effects when integrated with flexible LEDs.

The invention discloses a method for preparing a hard carbon negative electrode material from ethylene tar, which comprises the following steps: S1, in an inert atmosphere, carrying out heating extraction pretreatment on the ethylene tar to obtain a light component and a heavy component; s2, mixing the light component with a cross-linking agent and a catalyst, and carrying out a thermal polycondensation cross-linking reaction in an inert atmosphere to obtain a primary cross-linked product; s3, curing and pre-oxidizing the primary cross-linked product under mixed gas of oxygen and inert gas to obtain a hard carbon precursor; and S4, carbonizing the hard carbon precursor in an inert atmosphere to obtain the hard carbon material. According to the invention, simple extraction and cross-linking technologies are utilized, the advantage of high conductivity of the ethylene tar derived carbon material is retained, abundant sodium storage structures are successfully introduced, and the prepared hard carbon material shows excellent electrochemical performance in the sodium ion battery.

The application relates to the technical field of sodium ion battery negative electrode materials, and discloses resin-based hard carbon microspheres for sodium ion batteries and a preparation method thereof, which comprises the following steps: mixing styrene, a crosslinking agent and a catalyst to prepare an oil phase, dispersing the oil phase in a polyvinyl alcohol aqueous solution, and preparing resin microspheres through micro-suspension polymerization; and then performing air atmosphere pre-oxidation and inert atmosphere carbonization treatment to obtain a target product. Through regulation and control of a micro-suspension polymerization formula and a step-by-step heat treatment process, a dense spherical structure with rich closed pores and a suitable interlayer spacing is constructed, and the technical problems of low tap density and easy melting collapse of pyrolysis of traditional resin-based hard carbon are effectively solved. The obtained hard carbon microspheres have uniform particle size distribution, extremely high tap density and excellent powder fluidity, simultaneously exhibit high reversible specific capacity, high initial efficiency and excellent rate cycle stability, and are suitable for large-scale commercial application.

This invention discloses a method for preparing and applying nano-silicon carbide. Using petroleum-based hydrocarbons as the carbon source and nano-silicon particles obtained from the reduction of silicon-containing compounds as the silicon source, nano-silicon carbide is prepared via a two-step method combining low-temperature reduction and calcination. Specifically, silicon-containing compounds, hydrides, molten salts, and petroleum-based hydrocarbons are reduced at low temperature to obtain a silicon carbide composite. This composite is then calcined in an argon atmosphere to generate 3C-type silicon carbide particles with a particle size of 10–20 nm. The prepared nano-silicon carbide was used as a lithium-ion battery anode and tested, exhibiting good cycle stability and rate performance. This invention prepares nano-silicon carbide using a simple method combining low-temperature reduction and calcination, eliminating the need for mechanical crushing. The prepared nano-silicon carbide is a lithium-ion battery anode material with high cycle stability and excellent electrochemical performance.

The present application relates to the technical field of aqueous manganese ion energy storage, and particularly relates to a preparation method of an aqueous manganese ion energy storage device capable of temperature difference charging, and the preparation steps comprise the following steps: S1, mixing a manganese triflate solution and a manganese perchlorate solution to obtain an electrolyte; S2, mixing bismuth telluride, acetylene black and polyvinylidene fluoride to prepare a slurry, coating the slurry on cut graphite paper, and drying to obtain a bismuth telluride positive electrode; S3, ultrasonicating and drying a metal foil to obtain a negative electrode; and S4, assembling the electrolyte, the positive electrode and the negative electrode to obtain the energy storage device. The present application improves the cycle stability of the positive electrode of the manganese ion energy storage device, enables the manganese ion energy storage device to have high reversible specific capacity and long cycle life, and exhibits excellent electrochemical performance.

The invention discloses a high-load sulfur positive plate for a high-performance lithium-sulfur battery and a preparation and modification method of the high-load sulfur positive plate. The active material of the positive plate is sulfurized polyacrylonitrile (SPAN), and the surface of the positive plate is subjected to laser etching treatment with specific power to form a porous structure. The preparation method comprises the following steps: preparing SPAN, a binder and a conductive agent into a slurry according to a specific ratio, and after coating and drying, etching the surface of the electrode by using 1.5-6W laser. According to the invention, the regular micron-sized grooves are created in the surface of the positive plate through laser etching, and the patterned structure effectively enhances electrolyte infiltration, improves charge transfer dynamics and relieves stress accumulation in the charge-discharge process, so that the structural stability and cycle performance of the electrode under high sulfur loading capacity are remarkably improved. The method is simple in process and low in cost, and an effective scheme is provided for preparing the high-performance and high-load lithium-sulfur battery.

The invention provides a high-specific-capacity hard carbon material as well as a preparation method and application thereof. The high-specific-capacity hard carbon material is prepared from raw materials including a phenolic compound, an aldehyde compound, a catalyst and a curing agent, the preparation method comprises the following steps: (1) uniformly mixing a phenolic compound, an aldehyde compound and a catalyst in water, and reacting to obtain a low-molecular-weight resin solution; (2) adding an amine curing agent into the low-molecular-weight resin solution obtained in the step (1), uniformly mixing, and carrying out hydrothermal reaction to obtain high-molecular-weight cross-linked resin; and (3) carrying out low-temperature calcination on the high-molecular-weight cross-linked resin obtained in the step (2) in an oxygen-containing gas atmosphere, then carrying out high-temperature calcination in a protective gas atmosphere, and cooling to room temperature to obtain the high-specific-capacity hard carbon material. The prepared high-specific-capacity hard carbon material is high in reversible specific capacity, the first coulombic efficiency and the rate capability are kept at a high level, and the comprehensive sodium storage performance is excellent.

The application provides a preparation method of a zinc ion battery positive electrode material. The method uses self-made porous Mn-MOF as a sacrifice template to introduce a vanadium source, and in a protective atmosphere, in-situ constructs a MnO-MnV2O4-V2O3 ternary heterostructure through high-temperature carbonization treatment. The prepared Mn-MOF has porous nanometer characteristics, a large specific surface area and rich pore structures, can realize efficient loading and uniform dispersion of the vanadium source, and further forms a ternary composite material with synergistic action of double active sites. In the continuous charge and discharge cycle process, the double active sites can significantly increase the number of electrochemical active sites, and the ternary hetero-interface can strengthen the interface orbital hybridization effect, effectively improve the electronic conductivity of the material, and thus significantly improve the discharge specific capacity and cycle stability of the zinc ion battery.