80results about How to "Improve long cycle stability" patented technology

The present invention relates to a targeted magnetic nanoparticle drug and the preparation method thereof. The targeted magnetic nanoparticle drug comprises an effector molecule and a guidance molecule in a weight ratio of 1:0.0001-0.20. The aforesaid effector molecule is a magnetic particle, with a particle size of not more than 1000 nm and a specific adsorption rate (SAR) of 10-7000 W/gFe. The aforesaid guidance molecule comprises an antibody, a ligand or a magnetic particle. The particle size of the aforesaid targeted drug is 2-1000 nm. The targeted magnetic nanoparticle drug is prepared by coupling a magnetic particle and a guidance molecule in a weight ratio of 1:0.0001-0.20 in water, organic or inorganic substance or the mixed solution thereof. The resultant targeted magnetic nanoparticle drug can realize targeted magnetic hyperthermia treatment and targeted magnetic thermoablation treatment and prevention on the tumors, and effectively kill the cancer cells, and cure the malignant tumors.

The invention relates to a spinel composite material, a preparation method and application thereof. The composite material provided by the invention has a general formula of CxNy-(LaM'b)4(McM''d)5O12-eAf, wherein the CxNy is a compound containing carbon and nitrogen. The invention also provides a preparation method and application of the composite material. The invention also provides a cathode comprising the composite material of the invention, and a lithium battery and an electrochemical supercapacitor comprising the cathode. The composition material of the invention has high electronic conductivity and ionic conductivity, particularly high multiplying performance and high cyclical stability.

The invention relates to a preparation method and application of a polycarbonate-based polymer electrolyte and belongs to the technical field of lithium ion batteries. According to the preparation method of the present invention, vinyl ethylene carbonate, conductive lithium salt, a porous support material, and a solvent are adopted to prepare the polymer electrolyte. The preparation process of thepolymer electrolyte is simple, easy to control, and has excellent mechanical properties; the thickness of the polymer electrolyte ranges from 50-500 microns; the room temperature ionic conductivity of the polymer electrolyte is larger than 10<-3> S cm<-1>; and the electrochemical window of the polymer electrolyte is larger than 4.7 V. According to the polymer electrolyte adopted, the growth of lithium negative pole dendritic crystals can be effectively inhibited, and the compatibility of the polymer electrolyte with an interface and the long cycle performance of the polymer electrolyte can beimproved. With the polymer electrolyte adopted, a solid-state lithium ion battery can work for a long time at room temperature. The polymer electrolyte has good flexibility and is suitable for flexible lithium ion battery devices of wearable electronic devices.

The invention discloses a core-shell material. A core material of the core-shell material is selected from at least one of compounds having the molecular formulae as shown in formula (I) and formula (II); and the core-shell material is prepared by a method of a multilayer precursor. The core-shell material is applied to the field of a lithium ion battery as a positive electrode material, and has good air stability and safety performance while the high capacity advantage is exerted.

The invention relates to the field of positive electrode materials, and provides a high-nickel positive electrode material, a preparation method thereof, and a lithium ion secondary battery. The high-nickel positive electrode material comprises secondary particles, wherein the secondary particles comprise a plurality of primary particles, the primary particles comprise an active substance, the general chemical formula of the active substance is LibNixCoyMzNwO2, 0.95 <=b <=1.05, 0.8 <=x < 1, 0<y+z<=0.2, x+y+z=1, 0.0001<=w<=0.003, M is selected from at least one of Mn and Al, and N is a metal; acoating layer which comprises a first coating layer and a second coating layer, wherein the first coating layer is formed on the surface of the primary particle, the second coating layer is formed onthe surface of the secondary particle, and each of the first coating layer and the second coating layer contains a phosphoric acid compound. According to the high-nickel positive electrode material,the preparation method thereof and the lithium ion secondary battery, the cost is low, large-scale production can be realized, and the rate capability and the cycling stability of the lithium batterycan be effectively improved.

The invention belongs to the technical field of sodium-ion battery materials, and specifically discloses a positive electrode material for sodium phase rich sodium-ion batteries which is a composite material of sodium phase rich titanium-manganese-sodium phosphate and carbon; and the chemical formula of the sodium phase rich titanium-manganese-sodium phosphate is Na3+4xMnTi1-x(PO4)3, wherein x isgreater than 0 and smaller than or equal to 0.3. The invention also discloses preparation of the composite material and application thereof in the sodium-ion batteries. According to the composite material, the sodium phase rich titanium-manganese-sodium phosphate is creatively adopted, and the content of sodium in the material is improved through an appropriate proportion of titanium defect. Redundant sodium content in the character is beneficial for maintaining the stability of the structure in the process that sodium ions are taken out, and then the long cycling stability of the material ispromoted. Moreover, the sodium phase rich titanium-manganese-sodium phosphate is cooperative with carbon, so that the electrical properties, such as capacity and cycle performance, of the obtained composite material can be promoted obviously. Moreover, the system of Na-Mn-Ti-P-O is rich in resources and low in cost, and the preparation method is simple in operation and wide in commercial application prospects.

The invention provides a three-dimensional current collector for a metal lithium negative electrode of a primary/secondary battery, which is a nano-network having a porous structure and formed by weaving carbon nano-tubes or carbon nano-tube bundles. The three-dimensional current collector for the metal lithium negative electrode of the primary/secondary battery refers to a three-dimensional carbon nano-tube network material which has the three-dimensional porous structure formed by weaving the carbon nano-tubes or the carbon nano-tube bundles and used for containing metal lithium, can suppress the growth of lithium dendrites in the metal lithium secondary battery, and can realize high-capacity discharge under high current density. The metal lithium negative electrode of the primary/secondary battery prepared from the three-dimensional current collector has extremely high long cycling stability and can be charged and discharged for multiple times by extremely high specific capacity; and meanwhile, the composite negative electrode shows good rapid charge and discharge capacity.

The invention discloses a transition metal cobalt single atom/cluster embedded nitrogen-doped carbon skeleton material, and a preparation method and application thereof. The preparation method comprises the following steps: adding a cobalt source, a nitrogen-containing carbon source and silicon dioxide into a solvent, and carrying out ultrasonic stirring; carbonizing the obtained mixture in an inert atmosphere; carrying out pickling and etching on the obtained product in hydrochloric acid and hydrofluoric acid, and then washing and drying to obtain the transition metal cobalt single atom/cluster embedded nitrogen-doped carbon skeleton material. The method is simple in step and high in repeatability, and for the transition metal cobalt single atom/cluster embedded nitrogen-doped carbon skeleton, a mixed structure is endowed with enhanced electron conduction, and a large amount of uniformly dispersed N-C and Co-Nx active sites are introduced, thereby facilitating absorption of lithium ions and promotion of the interface reaction of the electrode material and the electrolyte. When being used as a lithium ion battery negative electrode material, the metal cobalt single atom/cluster embedded carbon hybrid material shows ultrahigh electrochemical activity and has very high potential application value.

The invention belongs to the technical field of electrochemical catalytic electrodes, and particularly relates to a hollow foam autocatalytic electrode and a preparation method thereof. The autocatalytic electrode is a hollow foam structure electrode constructed by a transition metal catalyst, and is obtained through coating a conductive transition metal catalyst with macromolecule foam, and thenremoving the macromolecule foam through high-temperature treatment. The catalyst is selected from an alloy or a compound consisting of a transition metal and one or more elements of boron, phosphorus,carbon, nitrogen, sulfur and oxygen; the transition metal is one or more of nickel, cobalt, iron, cerium, copper, manganese, vanadium, tungsten and molybdenum; the macromolecule foam is selected frommelamine resin foam, polyurethane foam, polystyrene foam and polyethylene foam. The autocatalytic electrode is low in cost, simple in structure, high in catalytic activity, good in cycling stabilityand excellent in mechanical strength, and has industrial practical value in the fields of water electrolysis, chlor-alkali chemical industry, sewage treatment, industrial catalysis, battery electrodesand the like.

The invention discloses a high-energy density ferrous phosphate lithium battery electrolyte and a lithium ion battery and belongs to the technical field of lithium ion batteries. The high-energy density ferrous phosphate lithium battery electrolyte of the present invention comprises a nonaqueous organic solvent, lithium salt and additives, wherein the additives comprise three kinds of additives, namely an A additive, a B additive and a C additive; the structural formula of the additive A is M which is described in the descriptions of the invention; the additive B is a compound of which the structural formula is N or O which is described in the descriptions of the invention; and the additive C is a type of sulfur-containing ring organic compound. According to the electrolyte of the invention, the A additive, the B additive and the C additive are used in a combined manner, so that organic and inorganic compositions in an SEI film are relatively balanced; a battery pole sheet interface isoptimized; the physical and chemical stability of the SEI film is enhanced; the performance requirements of a lithium iron phosphate system high-energy density battery can be satisfied; and the balance of comprehensive performance under a high-energy density condition can be realized.

The invention discloses polymer electrolyte of a high-voltage window, and relates to the field of lithium ion battery electrolyte. A hydrogen-containing organosilicon compound is used as a main chain,and ethylene carbonate is used as a side chain, a conductive lithium salt, an organic solvent and an initiator. Graft polymerization is performed through adoption of a chemical method, the construction of the hydrogen-containing organosilicon compound used as the main chain can be used as a skeleton, so that the electrochemical stability window, mechanical properties and thermal stability of thepolymer electrolyte are improved, and an ion channel can also be provided; the side-chain ethylene carbonate is used as a main ion channel of the polymer electrolyte, so that the ionic conductivity and the ionic migration number of the polymer electrolyte are improved, the interfacial compatibility of the polymer electrolyte and an electrode material is improved, and the charge-discharge performance of the solid-state lithium ion battery is improved.

The invention discloses cellulose-coated graphene composite carbon aerogel as well as a preparation method and application thereof. The preparation method comprises the following steps: adding cotton cellulose into a sodium hydroxide solution; placing a mixed solution formed in the previous step at a low temperature, mixing the mixed solution with a graphene oxide solution at a low temperature, and then performing stirring to obtain a cellulose-coated graphene oxide mixed solution; pouring the cellulose-coated graphene oxide mixed solution into a mold, and conducting standing at room temperature to obtain cellulose-coated graphene oxide hydrogel; carrying out freeze drying on the cellulose-coated graphene oxide hydrogel to obtain cellulose-coated graphene oxide aerogel; and carrying out high-temperature pyrolysis on the cellulose-coated graphene oxide aerogel to obtain the cellulose-coated graphene composite carbon aerogel. The cellulose-coated graphene composite carbon aerogel is used in an electrode structure for inducing directional growth of lithium dendrites so as to achieve the effect of protecting a battery diaphragm.

The invention provides a preparation method of an N-doped Co nanocluster/N-doped porous carbon/S composite material for a positive electrode of a high-performance potassium-sulfur battery. ZIF-67 is used as an initial raw material, and an N-doped Co nanoparticle/N-doped porous carbon composite material is obtained through low-temperature long-time staged carbonization and acid aqueous solution soaking; and the obtained N-doped Co nanoparticle/N-doped porous carbon composite material is compounded with sulfur to obtain the N-doped Co nanocluster/N-doped porous carbon/S composite material. According to the method disclosed by the invention, a Co-N bond with high catalytic activity can be formed in situ, and the carbon matrix with a hierarchical pore structure and the Co nanocluster are combined to be used as the positive electrode material of the potassium-sulfur battery, so that the electrochemical performance of the potassium-sulfur battery can be remarkably improved.

The invention belongs to the technical field of lithium batteries, and particularly relates to a method for improving the long cycle performance of a layered positive electrode material thick electrode under high voltage. The method comprises the steps that after slurry mixing and coating are conducted, a solvent in slurry is dried, through the liquid phase-solid phase-gas phase conversion process of the solvent, the uniformity of liquid-phase slurry and the orderliness of solid-phase slurry are kept for final dried electrode components, and the low-tortuosity thick electrode with directionally-arranged pore channels is formed. On one hand, the conductive agent and the binder in the low-tortuosity electrode are uniformly distributed, and on the other hand, the construction of the lithium ion transmission pore channel is beneficial to full infiltration of an electrolyte on a pole piece and rapid transmission of lithium ions, so that a sufficient electron and lithium ion transmission network around each particle in the electrode can be effectively ensured; the uniformity of electrochemical reaction in the thick electrode is ensured, and the cracking of particles caused by the volume change of each special shape is effectively avoided, so that the long-cycle stability is improved.

The invention discloses a preparation method of a tantalum oxide/tantalum carbide composite material as well as a product and application of the tantalum oxide/tantalum carbide composite material. The preparation method comprises the following steps of: uniformly mixing acetylacetone, an organic solvent, a tantalum source and phenolic resin, preserving heat and refluxing to obtain a complex; performing solvothermal reaction on the complex to obtain precursor powder containing the tantalum source and a carbon source; and fully grinding the precursor powder, and carrying out heat treatment under the protection of inert gas to obtain the tantalum oxide/tantalum carbide composite material. The prepared tantalum oxide/tantalum carbide composite material can be used as a lithium ion battery electrode material. The tantalum oxide/tantalum carbide composite material has the advantages of simplicity in operation, few steps, short period and low energy consumption, solves the problem of agglomeration in a high-temperature process, is beneficial to shortening the diffusion distance of ions, and has obvious advantages as a lithium ion battery electrode material due to good conductivity and chemical stability of tantalum carbide.

The invention provides an electrolyte and a lithium ion battery comprising the same. The electrolyte adopted by the invention comprises a non-aqueous organic solvent, an electrolyte lithium salt and an electrolyte functional additive, wherein the electrolyte functional additive contains a polynitrile compound and a bis (trimethylsilyl) nitrogen-containing heterocyclic compound. The inventor creatively discovers that a Si-N bond in the bis (trimethylsilyl) nitrogen-containing heterocyclic compound has higher electronegativity compared with a C-N bond in a polynitrile compound, and can be preferentially combined with a proton H < + > generated by oxygenolysis of electrolyte components, so that weakening of the complexing ability of the proton H < + > on the polynitrile compound is avoided, and the stability of the electrolyte is improved. Compared with a single multi-nitrile compound, the synergism of the two can better stabilize the interface property of a positive electrode/electrolyte, and inhibit the dissolution of transition metal ions and the further oxygenolysis of electrolyte components, so that the lithium ion battery applying the electrolyte system has excellent long cycle stability.

The invention belongs to the technical field of lithium sulfur batteries, in particular to a cyanopolymer modified sulfur cathode and a high-performance lithium sulfur battery composed of the same. The main component of the coating of the sulfur cathode of the invention is cyanopolymer, and the sulfur cathode is obtained by modifying the surface of the sulfur cathode with cyanopolymer through scrape-coating (or spin-coating, spray-coating or transfer-printing) and drying the cyanopolymer. The method provided by the invention is simple to operate and easy to apply, and the polymer coating can adsorb polysulfides and inhibit the 'shuttle effect' of polysulfides. Therefore, the long cycle stability and specific discharge capacity of lithium sulfur batteries are greatly improved, and a new method is provided for the development of long-life lithium sulfur batteries.

The invention provides a preparation method of coral-like strip-shaped porous carbon, which comprises the following steps: mixing coal pitch and a template activator, and calcining at high temperature to obtain the coral-like strip-shaped porous carbon. The invention also provides the porous carbon. The invention further provides application of the coral-like strip-shaped porous carbon. The raw material is hard coal pitch which is a byproduct in the coal hot working process, and the ultrahigh carbon content enables the prepared carbon-based material to have higher carbon yield, so that the carbon-based material is an ideal carbon precursor capable of realizing large-scale application; meanwhile, the coral-like strip-shaped porous carbon material is stable in structure and high in defect degree, so that higher lithium storage specific capacity and faster lithium storage reaction kinetics are shown, the energy density of a commercial lithium ion battery/capacitor can be greatly improved, and therefore, the service life of the commercial lithium ion battery/capacitor can be greatly prolonged.