662results about How to "Improve cycle stability" patented technology

The invention belongs to the technical field of batteries, and particularly relates to a negative plate and a preparation method and application thereof. The negative electrode plate comprises a negative electrode current collector and a negative electrode material layer arranged on at least one side surface of the negative electrode current collector, the negative electrode material layer comprises a negative electrode active substance, a negative electrode conductive agent and a composite binder, and the composite binder comprises carboxymethyl cellulose lithium and siloxane. The negative electrode plate has relatively high stripping force or crack resistance, and the first coulombic efficiency or cycle stability of the battery can be effectively improved when the negative electrode plate is applied to the battery.

The invention discloses a preparation method and application of an iron-doped molybdenum disulfide / polymer-based composite solid-state electrolyte, and relates to the technical field of solid-state batteries. After the iron element is doped, defects are introduced into the structure of the modified molybdenum disulfide, phase change is induced, dissociation of the lithium salt is promoted through synergism of the modified molybdenum disulfide and the iron element, and more free lithium ions are released; and meanwhile, the proportion of an amorphous region of the polymer electrolyte is increased, so that the ionic conductivity is improved, and the oxidation resistance is enhanced. In addition, the iron-doped molybdenum disulfide can effectively catalyze decomposition of lithium salt anions, and construction of a uniform and stable solid electrolyte interface (SEI) layer on the surface of the electrode is facilitated. The all-solid-state lithium metal battery assembled based on the modified solid electrolyte shows excellent electrochemical performance.

The invention provides a silicon-carbon composite negative electrode material, a preparation method of the silicon-carbon composite negative electrode material, a lithium ion battery negative electrode plate containing the silicon-carbon composite negative electrode material and a lithium ion battery, and relates to the technical field of lithium ion batteries. The silicon-carbon composite negative electrode material comprises a porous carbon skeleton, silicon distributed in internal pores of the porous carbon skeleton, and a functional interface layer covering the outer surface of the skeleton, wherein no free silicon elementary substance exists on the outer surface of the porous carbon skeleton, and the functional interface layer comprises a metal fluoride passivation layer formed by reacting metal elements doped in the carbon skeleton with a fluorine-containing etching agent; and the hybrid electrolyte coating layer is formed by reacting an oxygen-containing or nitrogen-containing functional group grafted on the surface of the carbon skeleton with a fluorine-containing etching agent. According to the technical scheme, the stable interface layer with passivation protection and ion conduction functions can be constructed in situ while high-activity silicon on the surface is removed, so that the first coulombic efficiency, the cycling stability and the rate capability of the battery are remarkably improved, side reactions are reduced, and the safety of the battery is improved.

The present application provides a diaphragm-free lithium ion battery. The battery comprises a positive electrode current collector, a positive electrode active material, a solid electrolyte, a solvent, a negative electrode active material, and a negative electrode current collector. The solid electrolyte is a solid porous organic polymer, which contains specific functional groups, including weakly coordinated anion groups, and the corresponding cation of the anion group is lithium ion. The porous polymer is a solid powder, which can act as a barrier between the positive electrode active material and the negative electrode active material, eliminating the need for a diaphragm and greatly improving the safety performance of the battery.

The invention provides a lithium metal negative electrode protection layer, a preparation method and application thereof, and a lithium metal battery, and relates to the technical field of lithium metal batteries, the protection layer is formed on the surface of a metal lithium foil, and comprises a polymer and an inorganic substance; the polymer comprises polyvinylidene fluoride-hexafluoropropylene; the inorganic substance includes lithium phosphate. The components of the protective layer cooperate with each other, so that lithium dendrites can be physically inhibited, the first discharge specific capacity, the first coulombic efficiency and the cycle performance can be effectively improved, gas can be actively consumed, and the cycle stability and the safety performance of the lithium metal battery can be cooperatively improved from multiple dimensions; the technical problems that an existing protective layer cannot actively eliminate gas, the lithium dendrite inhibiting effect is poor, and the interface stability is poor are solved.

The present invention belongs to the field of lithium extraction, and specifically relates to a H 1.6 Mn 1.6 O4@H2TiO3 composite lithium ion sieve, comprising H 1.6 Mn 1.6 O4 with a porous structure, and H2TiO3 embedded in the pore structure and surface-coated in H 1.6 Mn 1.6 O4. The present invention also includes the preparation of the material and its application in lithium extraction. The material described in the present invention has excellent lithium extraction capacity and cycle stability.

The application discloses a synthesis method of a large single-crystal sodium-ion battery layered oxide positive electrode material, and comprises the following steps: (1) weighing metal oxides containing transition metal elements, transferring to a device with mixing functions, uniformly mixing, and obtaining a metal oxide mixture; (2) adding acid to the metal oxide mixture, fully mixing, and completing an acid treatment process; (3) adding alkali to the mixture after acid treatment, fully mixing; (4) transferring the mixture obtained in the step (3) to a calcining furnace, high-temperature calcining, and obtaining a layered oxide. The acid treatment process is introduced, the surface of the metal oxide forms a defect structure under the action of the acid, and the defect structure is more beneficial to the formation of strong interaction between each component of the metal oxide and between the metal oxide and sodium-containing alkali, so that a larger single-crystal layered oxide structure is finally formed, and the specific capacity, rate performance and cycle performance are excellent.

The application provides a high-entropy lithium iron manganese phosphate material, a preparation method, application and battery. The chemical formula of the high-entropy lithium iron manganese phosphate material is LiFe x Mn y M z N a P 1‑a O4, wherein 0

This invention discloses a method for preparing a self-supporting silicon-carbon electrode sheet, comprising the following steps: preparation of expanded graphite, nitrogen doping, pore formation, silicon composite, and molding. Its innovation lies in: through the porous design of the nitrogen-doped expanded graphite matrix, combined with in-situ silicon coating and integrated molding process, an integrated electrode sheet with a three-dimensional elastic conductive network is constructed. By doping expanded graphite with nitrogen, the wettability of the electrode sheet to the electrolyte can be improved. The pores in the expanded graphite can serve as ion transport channels between graphite layers. Then, utilizing the microscopic two-dimensional sheet structure of expanded graphite, direct molding is achieved to realize efficient composite of graphite and silicon and complete the preparation of the negative electrode sheet in one step. This results in a breakthrough electrode sheet thickness reaching the 1mm level (far exceeding the tens of micrometers level of traditional current collectors), while also possessing high rate performance and excellent cycle stability. The three-dimensional structure maintains electrode integrity through a mechanical interlocking effect, and the structure has a certain degree of elasticity, allowing the material to maintain structural stability during repeated expansion / contraction caused by charging and discharging, significantly improving capacity retention.

This invention relates to a boron-doped multi-element polyanionic sodium-ion battery cathode material and its preparation method, comprising the following steps: [The method involves] mixing Na₄Fe₂O₃ with... 3‑X B X (PO4) 2‑Y (SiO4) Y The stoichiometric ratio of P2O7 is determined by adding ferrous source, boric acid, sodium source, phosphorus source, and silicon source to water, followed by the addition of carbon source and mixing thoroughly to obtain a mixed slurry; wherein 0.2≤X≤0.5, 0<Y≤1; the mixed slurry is then ground to obtain a sand-milled slurry; the sand-milled slurry is dried to obtain precursor powder; under a protective atmosphere, the precursor powder is sintered at 450~550℃ to obtain boron-doped multi-element polyanion sodium-ion battery cathode material. The introduction of boron and silicon elements in this invention helps reduce raw material costs, improve the electrochemical performance of the material, especially enhancing the structural stability, rate performance, and cycle life of the cathode material, and also lowers the sintering temperature, meeting the requirements for cost reduction and efficiency improvement.

Disclosed are a phosphorus-containing compound, a nonaqueous electrolyte, and a lithium ion battery. In the present application, an additive for a lithium ion battery is provided, the phosphorus-containing compound has a structure shown in formula (I), wherein the R1 and R2 groups are as described in the context of the present application, the phosphorus-containing compound is added in a nonaqueous electrolyte, and the internal resistance of the battery can be significantly reduced, particularly the internal resistance when the battery is fast-charged.

The application discloses a nitrogen-doped carbon-coated three-metal catalyst and a preparation method and application thereof, and belongs to the field of catalyst preparation and application. The method adopts sucrose, melamine and metal salt as low-cost raw materials, and forms an alkaline environment with the assistance of sodium hydroxide. In the environment, melamine is hydrolyzed into cyanuric acid, which is complexed with sucrose metal ions to form a stable supramolecular aggregate precursor containing metal, and then realizes effective encapsulation of the metal in a high-temperature pyrolysis process. The synergistic effect of the three metal elements Co, Ni and Zn significantly improves the performance of the catalyst, so that CoNiZnO@NC-600 not only exhibits high conversion rate (98.4%) and selectivity (99%) in the reaction of hydrogenation conversion of furfural to furfuryl alcohol, but also has excellent cycle stability, thereby providing a new efficient method for the hydrogenation conversion of biomass-derived compounds.

This invention belongs to the technical field of lithium-ion battery cathode materials, specifically relating to a sulfonic acid-based organic polymer, a sulfonic acid-based organic polymer / carbon nanotube composite material, its preparation method, and its application. The sulfonic acid-based organic polymer is prepared by a dehydration condensation reaction of 2,5-diaminobenzenesulfonic acid and hexaazabenzophenanthrene hexacarboxylic acid trianal. When used as a lithium-ion battery cathode material, it exhibits high specific capacity and excellent cycle stability, overcoming the solubility problem of organic cathode materials in electrolytes. When the sulfonic acid-based organic polymer is combined with carbon nanotubes and applied to lithium-ion battery cathode materials, battery performance is significantly improved, and the capacity remains stable even after long-term cycling. The synthesis methods of the sulfonic acid-based organic polymer and the sulfonic acid-based organic polymer / carbon nanotube composite material of this invention are simple, have abundant raw material sources, and good reproducibility, making them suitable for industrial production and possessing broad application prospects in the field of lithium-ion batteries.

This invention belongs to the technical field of industrial flue gas purification and solid waste resource utilization, specifically involving hydrogen fluoride adsorbents, their preparation methods and applications, and the application of waste adsorbents as fluoride electrode materials. The invention involves sequentially subjecting decayed oak wood to anaerobic fermentation and vacuum micro-aerobic pyrolysis to obtain a porous biochar carrier; loading a metal precursor onto the porous biochar carrier using an impregnation method to obtain a semi-finished product; and calcining the semi-finished product in a protective gas atmosphere to obtain the hydrogen fluoride adsorbent. The hydrogen fluoride adsorbent provided by this invention exhibits a high adsorption rate for HF, and the saturated waste adsorbent can be reused as a fluoride electrode material, demonstrating excellent cycle stability and rate performance. This invention provides a novel pathway for the functional transformation of biomass waste and the preparation of high-performance energy storage materials, while simultaneously reducing the cost of HF adsorbents, and has broad practical application value.

The application provides a biomass-based composite electrode material, an electrode sheet and a hybrid supercapacitor, and belongs to the technical field of electrochemical energy storage. 3 The biomass-based composite electrode material comprises: a biomass-derived porous carbon matrix, pores with multiple pore sizes, the volume of the pores is 0.7-1.7 cm 2 / g; and nickel-cobalt layered double hydroxide nanosheets vertically anchored on the surface of the biomass-derived porous carbon matrix; the specific surface area of the composite electrode material is 900-1400 m 2 / g. The biomass-based composite electrode material of the application significantly improves the ion adsorption and charge storage capacity. In addition, the electrode material is applied in a capacitor, which effectively improves the energy density, electrode conductivity and cycle stability of the supercapacitor.

The present application relates to a kind of in situ low-temperature confined carbonization construction carbon dot enrichment coating layer manganese-based positive electrode material and its preparation method, by accurately coordinating the evolution condition of carbon point carbon source in the mixing system environment of coating process, freezing condition and sublimation and carbonization, realize the whole process synergistic control of carbon point carbon source spatial distribution, ice crystal template state, skeleton construction of controlled conversion of carbon point carbon source and harmful residue removal on the surface of manganese-based positive electrode material, successfully constructed the carbon dot enrichment coating layer of size controllable, density adjustable, ion permeability good and interface combination firm on the surface of manganese-based positive electrode material, to realize the synergistic promotion of manganese-based positive electrode material cycle performance, rate performance and interface stability.

The present application relates to ternary high-nickel lithium-ion battery cathode materials and a preparation method thereof. The general expression of the cathode material is Li(Ni 1‑a‑b‑c Co a Mn b D c )O2, 0.01

This invention discloses a method for preparing and applying a current collector for a negative electrode-free sodium metal battery modified with monodisperse metal sites. The current collector substrate is placed in the reaction chamber of an atomic layer deposition (ALD) apparatus. A metal source and co-reactants are introduced through alternating feeding to generate monodisperse metal atoms, ultimately producing a negative electrode-free sodium metal current collector. By constructing uniform, high-density monodisperse metal atoms on the surface of the current collector substrate, the active sites of the metal atoms are densely and uniformly distributed. This guides sodium metal to deposit and peel off in a dense, flat layered morphology, effectively suppressing sodium dendrite formation and reducing the generation of dead sodium during cycling. This significantly improves the coulombic efficiency of the negative electrode-free sodium metal battery. When applied to a negative electrode-free sodium metal battery, the battery can achieve stable long-cycle operation in the initial state of a completely sodium-free negative electrode, effectively improving battery cycle stability and coulombic efficiency, and significantly extending battery life.

The application provides a high-nickel ternary material modification method and a high-nickel positive electrode material with a nitrogen-oxygen coating layer, and relates to the field of lithium ion batteries. In the high-nickel ternary material, surface lattice oxygen is gradually replaced by nitrogen atoms in a high-temperature long-time calcination process in a nitrogen-oxygen mixed atmosphere, so that a nitrogen-oxygen layer is formed on the surface, which is beneficial to the delocalization of electrons, thereby endowing the material with excellent electronic conductivity; meanwhile, the presence of the nitrogen-oxygen layer inhibits the transformation of the surface layer structure into a rock salt phase structure, which is beneficial to realizing efficient ion transport. The formation of the nitrogen-oxygen layer on the surface of the high-nickel ternary material can simultaneously improve the electronic and ionic conduction of the surface of the high-nickel positive electrode material, inhibit the interface side reaction, relieve the volume change, and thereby improve the cycle stability of the battery.

The invention relates to an O2-phase lithium cobalt oxide positive electrode material and a preparation method thereof, and belongs to the technical field of lithium ion batteries. The preparation method comprises the following steps: S1, uniformly mixing a doped metal source, a sodium source and a cobalt source, sintering, and cooling to obtain a P2-phase precursor; s2, uniformly mixing the P2-phase precursor, a lithium source A and the coating layer precursor, sintering, and cooling to obtain an intermediate A; s3, uniformly mixing the intermediate A and a lithium source B, sintering, and cooling to obtain an intermediate B; and S4, uniformly mixing the intermediate B and a lithium source C, sintering, cooling, washing and drying to obtain the O2-phase lithium cobalt oxide positive electrode material. The O2-phase lithium cobalt oxide positive electrode material with low residual sodium, high structural stability and excellent interface coating performance is prepared through a method of combining gradient ion exchange, gradient temperature control, gradient atmosphere regulation and control and synchronous in-situ coating.

This invention discloses a zirconium-lanthanum bulk co-doped high-nickel ternary material, its preparation method, and a battery. The zirconium-lanthanum bulk co-doped high-nickel ternary material is a ternary cathode material with bulk co-doped zirconium and lanthanum; the chemical formula of the ternary cathode material is LiNi. x Co y Mn (1‑x‑y) O2, wherein 0.8≤x≤0.9, 0≤y≤0.1; the total molar amount of zirconium and lanthanum is 1%~5% of the total molar amount of nickel, cobalt and manganese. The zirconium-lanthanum bulk co-doped high-nickel ternary material provided by the present invention enhances the mechanical strength of the ternary material through the bulk co-doping of zirconium and lanthanum, suppresses cracking and pulverization of the ternary material during charge and discharge, and improves cycle stability; at the same time, the two elements Zr and La synergistically stabilize the lattice, reduce lithium-nickel mixing, suppress irreversible phase transformation and lattice oxygen precipitation, achieve dual stability of bulk phase and interface, and improve the consistency and stability of the zirconium-lanthanum bulk co-doped high-nickel ternary material.

The invention belongs to the field of high-value utilization of waste industrial products, and particularly relates to a method for preparing a silicon-carbon electrode material by using metal-rich residual carbon of a coal-to-hydrogen byproduct. According to the method disclosed by the invention, harmful light and heavy metal impurities in the metal-rich residual carbon can be removed, and meanwhile, the carbon-silicon composite porous structure and the endogenous graphene are synchronously generated. Due to the large surface specific surface area, the special hole structure and the enhanced conductivity of endogenous graphene, when the carbon structure is matched with hybrid silicon holes in the carbon structure to be used as electrodes of a super capacitor, a lithium ion battery and a sodium ion battery, the super capacitor, the lithium ion battery and the sodium ion battery can obtain very high electrochemical performance; and particularly, the material has excellent specific capacity and excellent rate capability.

The invention relates to the technical field of lithium battery positive electrode material preparation, in particular to coated doped type lithium manganese iron phosphate gradient temperature control preparation equipment and method.The equipment comprises five temperature control bins arranged side by side, a sintering bin, a vertical flow guide plate, a unique temperature control gas inlet assembly and the like work cooperatively, the temperature control gas inlet assembly can flexibly adjust the gas state, and the temperature control gas inlet assembly can control the temperature of the lithium manganese iron phosphate; the preparation method comprises the following steps: firstly, mixing a lithium source, a manganese source and the like with a specific composite carbon source, and performing spray drying to obtain precursor particles; according to the preparation method, the defects of a traditional preparation technology in the aspects of temperature control and coating forming are overcome, accurate gradient temperature control can be achieved, the temperature uniformity can be improved, the coating effect can be optimized, and the preparation method is suitable for industrial production. And the performance of the lithium manganese iron phosphate positive electrode material is remarkably improved.

The invention relates to the technical field of solid-state batteries, in particular to a porous silicon carbon-metal composite negative electrode material and a solid-state battery. The porous carbon skeleton comprises a first hole, a second hole and a third hole; the aperture d1 of the first hole is greater than or equal to 5nm and less than or equal to 20nm; the aperture of the second hole is d2, and d2 is more than 25nm and less than or equal to 50nm; the aperture of the third hole is d3, and d3 is more than 80nm and less than or equal to 200nm; at least nanometer silicon particles are arranged in the first holes, and at least metal particles are arranged in the second holes and the third holes. According to the porous silicon carbon-metal composite negative electrode material, through the partition design of the gradient porous framework, the silicon locking function is achieved through the first holes, the stress buffer area effect is achieved through the second holes / third holes, the problem that the volume of a negative electrode with the large silicon loading capacity is seriously expanded can be remarkably solved, the silicon loading limit of a traditional single micropore structure is broken through, and the service life of the negative electrode is prolonged. And the energy density and the cycling stability of the battery are obviously improved.

The present application relates to the technical field of sodium battery materials, in particular to a sodium supplement coating based on a spiral iron-carbon composite material and a preparation method thereof, a spiral polypyrrole template is synthesized by a chiral template method, Fe3C@CNS spiral carbon composite material rich in Fe3C nanocrystals and iron single-atom sites is prepared through iron loading, sulfidation and high-temperature pyrolysis, Na2C2O4@Fe3C@CNS composite material is prepared by highly dispersing sodium oxalate on the surface and in the pores of the spiral carbon composite material through a recrystallization method, finally, a slurry is prepared by mixing the Na2C2O4@Fe3C@CNS composite material with a conductive agent and a binder, and the slurry is coated on the surface of an electrode to form a functional sodium supplement coating. The sodium supplement coating based on the spiral iron-carbon composite material and the preparation method thereof solve the problems of poor interface stability and first-cycle irreversible sodium loss of existing sodium ion batteries, realize efficient sodium pre-activation and interface synergistic regulation, and improve the comprehensive performance of the battery.

The invention discloses a low-partial-pressure CO2 catalytic absorption method and application, and belongs to the technical field of gas separation. The low-partial-pressure CO2 catalytic absorption method comprises the following steps: S1, providing a nitrogen-doped activated carbon catalyst; the nitrogen-doped activated carbon catalyst is prepared by taking activated carbon as a carbon source and modifying the activated carbon through a nitrogen-containing reagent; s2, providing an organic amine solvent; and S3, under the action of the nitrogen-doped activated carbon catalyst provided in the S1, enabling flue gas to react with the organic amine solvent provided in the S2. Compared with the existing CO2 absorption method, the method provided by the invention has the advantages that the CO2 absorption rate, the CO2 absorption capacity and the CO2 capture efficiency can be remarkably improved, so that low-cost CO2 capture is realized.

The invention relates to the technical field of sodium-ion batteries, in particular to a sodium-ion battery positive electrode material and a preparation method thereof. The sodium ion battery positive electrode material is Ti and Cl doped Na4VMn (PO4) 3, and the molar ratio of Na to Ti in the sodium ion battery positive electrode material is 4: (0.05-0.1); the molar ratio of Na to Cl is 4: (0.05-0.1). According to the sodium-ion battery positive electrode material provided by the invention, a titanium element and chlorine element synergistic co-doping mode is adopted, so that the ginger-Taylor distortion caused by manganese ions in the charging and discharging process can be inhibited, the lattice stress can be reduced, and the stability of the material structure can be enhanced; meanwhile, the dissolution of manganese under a high-rate cycle condition can be inhibited, and the loss of active substances and the side reaction of electrolyte are reduced, so that the electrochemical stability and the structural integrity of the electrode material are improved, and the sodium ion battery containing the positive electrode material has relatively high specific capacity, excellent rate capability and cycle stability.

The application relates to the secondary battery technical field, and discloses a manganese-based positive pole piece, a preparation method thereof, a secondary battery and an electric equipment. The positive pole piece comprises, in sequence from the thickness direction of the pole piece, a current collector, a manganese-based positive active material layer, an oxide layer and a phosphorus-containing oxygen acid covalent modification layer; the oxide layer and the phosphorus-containing oxygen acid covalent modification layer are connected through P-O bonds. The application proposes that the application constructs a stable multilayer interface modification structure by covalently combining the oxide layer and the phosphorus-containing oxygen acid covalent modification layer through sequentially stacking a multilayer structure, can cover the entire pole piece macroscopic interface, has strong binding force, can strengthen the adsorption capacity of manganese ions, block the interface side reaction chain, avoids the problems that the traditional particle-level coating is easy to break and fail, the binding force of the conventional protective film is weak and the distribution is uneven, and therefore can effectively inhibit the manganese ion elution and electrolyte decomposition, has the advantages of improving the battery capacity retention rate, the cycle stability and the thermal safety.

The application discloses a kind of hard carbon negative electrode material and preparation method thereof based on waste lithium battery diaphragm preparation.The hard carbon negative electrode material is prepared by using waste lithium ion battery PP / PE diaphragm as raw material, through raw material pretreatment, composite sulfonation pre-crosslinking, transient joule heat pulse carbonization, pickling purification step, its first charge specific capacity is greater than or equal to 310 mAh / g, first coulomb efficiency is greater than or equal to 90%, 1A / g cycle 500 cycles capacity retention rate is greater than or equal to 90%, and the performance is excellent.The application is coupled by composite sulfonation pre-crosslinking and transient joule heat rapid carbonization, compared with traditional process, energy consumption is reduced, and waste diaphragm is efficiently converted to high-performance hard carbon.

The application provides a preparation method of a binder, the binder is prepared from modified polyacrylonitrile through a cross-linking reaction and post-treatment; the modified polyacrylonitrile is a hydrolysis product of polyacrylonitrile, and the cross-linking agent of the cross-linking reaction is epichlorohydrin. The application also provides corresponding binders, lithium ion battery negative electrodes, lithium ion batteries and electrochemical devices. The binder of the application can significantly improve the cycle stability and rate performance of the battery, and the effect is particularly significant for a silicon negative electrode with large volume expansion. The preparation process of the binder of the application has the advantages of simple operation and low cost, and is easy to realize industrial production.