17results about How to "High theoretical capacity" patented technology

The invention belongs to the technical field of preparation of electrode materials, and particularly relates to a high-tap-density spherical ferric sodium pyrophosphate electrode material and a preparation method thereof. According to the preparation method, a uniform precursor is prepared by utilizing solution gel, and a strategy of combining spray drying with secondary sintering is adopted, so that uniform carbon coating and doping modification of ferric sodium pyrophosphate can be successfully realized, and the strategy provides an important experimental basis for an industrialization process of a sodium ion battery. And the method has great potential of large-scale preparation.

The invention provides an electrolyte for improving the interface stability of a four-electron aqueous zinc-iodine battery, and belongs to the technical field of zinc-iodine battery electrolyte additives, the electrolyte comprises N, N-dihydroxyethyl glycine, zinc sulfate, an additive and water; in the electrolyte, the concentration of the N, N-dihydroxyethyl glycine is 0.5 + / -0.2 mol / L; the molar ratio of the additive to the zinc sulfate is 1: 3; the additive comprises any one of methyl triethyl ammonium chloride, betaine hydrochloride and triethylamine hydrobromide. The electrolyte can enhance the interface stability of the electrode electrolyte, improve the cycling stability and electrochemical performance of the aqueous zinc-iodine battery, inhibit side reactions, and improve the safety and reliability of the battery. The invention also provides a high-capacity aqueous zinc-iodine battery.

The invention discloses a preparation method of a layered oxide positive electrode material of a sodium-ion battery. The preparation method specifically comprises the following steps: S1, preparing a precursor; s2, solid phase sintering; s3, modifying and coating; the invention relates to the technical field of sodium ion batteries. According to the layered oxide positive electrode material for the sodium-ion battery and the preparation method, by optimizing a precursor preparation process and introducing a modified coating technology, the structural change and phase change of the positive electrode material in the cycle process are effectively inhibited, the cycle stability of the battery is remarkably improved, and the preparation method is simple, easy to operate and suitable for industrial production. And the prepared positive electrode material has relatively high theoretical capacity and excellent electrochemical performance, is beneficial to promotion of commercial application of the sodium ion battery, shows good rate capability and cycling stability in the charge-discharge process, can meet the requirements of large-scale energy storage application, optimizes a precursor preparation process and a modified coating technology, and has good application prospects. And accurate control of chemical composition and structure of the positive electrode material is realized.

The invention relates to the technical field of electrochemistry, in particular to a supramolecular ionic liquid gel electrolyte of a solid-state zinc-iodine battery for a high-voltage platform, which is characterized in that free water in hydrogel is replaced by supramolecular interaction between ionic liquid and polyvinyl alcohol molecules to construct a water-poor ionic liquid polymer network; zinc bromide is introduced to serve as an ion carrier in a polymer network through the HofMichael effect, and preparation of the high-voltage solid-state zinc-iodine battery is finally achieved through the chemical coupling effect of bromide ions and iodide ions; the solid electrolyte is prepared from an ionic liquid and a hydrogel solution, imidazole cations of the ionic liquid have a strong electron withdrawing effect, and anions of the ionic liquid are combined with zinc ions and bromide ions to form polyanions. And the ionic liquid is used for replacing water in the hydrogel, so that the ionic liquid gel electrolyte with good chemical stability, mechanical property and electrochemical property is prepared.

The invention belongs to the field of water-based zinc ion batteries, and particularly relates to a preparation method of a composite positive electrode material with organic molecules embedded into three-dimensional microstructure vanadium pentoxide and application of the composite positive electrode material in the water-based zinc ion batteries. The preparation method comprises the following steps: preparing a large amount of crotch-shaped structure vanadium oxide precursor, adding malonamide into the solution of the vanadium oxide precursor, adjusting the pH value, carrying out hydrothermal treatment, filtering and collecting the precipitate after hydrothermal treatment, washing, drying and calcining to obtain the malonamide intercalation vanadium pentoxide material, and preparing the crotch-shaped structure vanadium pentoxide material by embedding small organic molecules (malonamide). The structural stability and the electric conductivity of the main body material are improved, and the problem of vanadium dissolution caused by water is solved, so that the water-based zinc ion battery with high capacity and long service life is obtained.

The invention belongs to the technical field of energy conversion and storage devices, and particularly discloses an all-solid-state optical energy storage integrated device and a preparation method and application thereof. The all-solid-state optical energy storage integrated device sequentially comprises an energy storage electrode, an energy storage all-solid-state electrolyte, a compatible electrode, a photoelectric conversion all-solid-state electrolyte and a dye-sensitized photoanode from bottom to top, wherein the compatible electrode comprises foamed nickel and a carbon-sulfur composite material coated on the foamed nickel, the preparation raw materials of the energy storage all-solid-state electrolyte comprise polyoxyethylene, lithium bis (trifluoromethanesulfonimide) and beta-cyclodextrin, and the preparation raw materials of the photoelectric conversion all-solid-state electrolyte comprise polyoxyethylene, elemental iodine, lithium iodide and beta-cyclodextrin. And the energy storage electrode is a lithium metal anode. The photoelectric conversion unit and the energy storage unit are integrated in one device, efficient light energy conversion and electric energy storage are achieved, and good energy conversion efficiency and cycling stability are achieved.

The invention belongs to the field of lithium ion battery organic positive electrode materials, and particularly relates to a truxene two-dimensional covalent organic framework material, a preparation method and application of the truxene two-dimensional covalent organic framework material as a lithium ion battery positive electrode material. The truxene ketone-based two-dimensional covalent organic framework material prepared by the invention has a full-conjugated single-crystal structure, is rich in a large number of conjugated carbonyl groups and carbon-nitrogen double bonds with electrochemical activity, can provide high-density oxidation-reduction active sites, and shows high reversible specific capacity when being used as an electrode active material in a lithium ion battery; and the material has excellent cycling stability and rate capability, and has potential application value in the aspect of organic electrode materials.

The invention discloses a porous graphene-based double transition metal selenide heterojunction composite material. The composite material comprises a porous graphene matrix and Ni0.85Se / CoSe polygonal nanoparticles loaded on the surface of the porous graphene matrix. According to the invention, a metal selenide heterojunction structure is constructed on a porous graphene matrix, so that a sodium ion cross-layer transport path can be effectively provided, and the graphene-based metal selenide heterojunction composite material has high ionic conductivity, small volume change in a working process, high reversible capacity and excellent rate and cycle performance; when the composite material is used as the negative electrode of the sodium ion battery, the selenide heterojunction structure close to the graphene hole can effectively reduce the structure and volume change, shorten the ion transmission distance, and effectively enhance the electrochemical stability and improve the capacity in the charging and discharging process; the sodium ion energy storage requirements of high specific capacity, long service life and safety can be met, and the method is suitable for popularization and application.

The embodiment of the invention relates to a lithium-free positive electrode FeF3 active material as well as a preparation method and application thereof. Adding the iron-based precursor into a reactor, and heating in an inert environment to remove water vapor; f2 is introduced into the reactor at a preset flow rate, and F2 and the iron-based precursor are subjected to a gas-solid reaction at a set temperature; and cooling the reaction product to obtain the lithium-free positive electrode FeF3 active material. According to the preparation method of the lithium-free positive electrode FeF3 active material provided by the embodiment of the invention, the iron precursor and F2 are directly subjected to the gas-solid reaction at the set temperature, the anhydrous high-purity FeF3 material can be efficiently synthesized at a relatively low temperature, and the preparation efficiency is improved.

The application discloses an aluminum ion battery positive electrode material and a preparation method and application thereof. x Al y MnO2.nH2O, wherein, 0<=x<=0.3, 1 / 3<=y<2 / 3, 0<=n<=2, and x and n are not 0 at the same time; the preparation method comprises the following steps: mixing an aluminum salt solution and a precursor K z MnO2.mH2O, performing a heating reaction, and obtaining the aluminum ion positive electrode material through heat treatment of a reaction product. The aluminum ion battery positive electrode material has the advantages of high specific capacity, excellent cycle performance and rate performance, low cost, and the like, is beneficial to promoting commercial application of the aluminum ion battery, and has a very wide application prospect.

The invention discloses a method for constructing a three-dimensional structure material based on a metal modified conjugated covalent organic plane Co-TCNB COF and application, and the method comprises the following steps: adding 1, 2, 4, 5-tetracyanobenzene and cobalt metal salt into an organic solution, and mixing; the preparation method comprises the following steps: heating to react, collecting precipitate, carrying out vacuum drying to obtain Co-TCNB COF, adding the Co-TCNB COF and piperazine or pyrazine into a solution to react under the assistance of ultrasonic waves, centrifuging, and carrying out vacuum drying to obtain the three-dimensional structure material. An interlayer bridging ligand piperazine or pyrazine is introduced on the basis of a Co-TCNB planar material to construct a Co-TCNB-PIP or Co-TCNB-PA material with a stable three-dimensional structure, the interlayer bridging ligand can avoid a serious pi-pi lamination phenomenon between the planar materials and promote transfer of interlayer charges, and when the Co-TCNB-PIP or Co-TCNB-PA material is used as a lithium battery negative electrode material, the material has a good application prospect. And the material has higher cycling stability, high conductivity and better ion diffusion dynamic characteristics.

The present application relates to the technical field of sodium ion battery negative electrode material, and specifically to modified hard carbon negative electrode material and its preparation method and application, the present application takes biomass waste oil tea shell as raw material, adopts sulfuric acid and phosphoric acid as dopant, carries out porosification and activation, obtains P, S double atom doping pre-carbonization porous carbon material after carbonization, takes tetraethyl orthosilicate as raw material to prepare nano SiO2 microspheres under catalysis, carries out carbonization after blending nano SiO2 microspheres and P, S double atom doping pre-carbonization porous carbon material, obtains modified hard carbon negative electrode material through pyrolysis reaction with magnesium powder at the same time of carbonization, the element doping in modified hard carbon negative electrode material provides more active sites for sodium ion storage, improves the theoretical capacity and conductivity of the material, and the nanoscale silicon powder reduces the pulverization phenomenon caused by volume expansion when silicon is used as the negative electrode material of sodium ion battery due to the special size effect, reduces the attenuation of battery capacity.

The invention relates to an activation method of a sodium-based silicate material as a positive electrode of a lithium-source-free lithium ion battery and application of the sodium-based silicate material in the lithium ion battery. The invention belongs to the field of electrochemistry. The problems that in the prior art, a sodium-containing electrode material directly serves as a lithium ion battery positive electrode, a charging curve is disordered, and the capacity performance is poor, and consequently application cannot be achieved are solved. According to the activation method disclosed by the invention, the sodium-based silicate material can be used as the positive electrode of the lithium-source-free lithium ion battery, and the sodium-based silicate material is subjected to sodium removal activation by combining repeated stepped charging with a cyclic voltammetry technology, so that the charging curve disorder of the sodium-based silicate material as the positive electrode of the lithium-source-free lithium ion battery is overcome; the problem that the sodium-based silicate material replaces a lithium source material to become a novel lithium-source-free lithium ion battery positive electrode material is solved, the cost is effectively reduced, and the environmental pollution is reduced.

This invention discloses a lithium-rich manganese-based layered oxide composite cathode material and its preparation method, belonging to the field of lithium-ion battery technology. The method includes: adding water to a nickel source, a cobalt source, and a manganese source to obtain a mixed solution; adding sodium carbonate solution to adjust the pH; washing with deionized water and centrifuging; drying; mixing with lithium salt; and pre-calcining to obtain Li. 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 1.8 F 0.2 The material was then subjected to a process involving the sequential addition of a carbon source and an organic solvent. The resulting mixture was heated under a mixed atmosphere to obtain a lithium-rich manganese-based basal oxide material. Na₂WO₄ and pyrrole were then added, and the mixture was dissolved in deionized water to obtain a composite cathode material, Li. 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 1.8 F 0.2 @N,S-C@Na2WO4@PPy. The composite cathode material of this invention has uniform particles, stable structure, and exhibits considerable wide potential window reversible capacity, excellent rate performance, and stable cycle life.

The present invention relates to a lithium secondary battery which includes a positive electrode including an overlithiated manganese-based oxide, in which an amount of manganese among total metals excluding lithium is greater than 50 mol% and a ratio (Li / Me) of the number of moles of the lithium to the number of moles of the total metals excluding the lithium is greater than 1, as a positive electrode active material; a negative electrode including a silicon-based negative electrode active material; a separator disposed between the positive electrode and the negative electrode; and an electrolyte, and satisfies Equation (1). 0.25A≤B≤0.6A In Equation (1), A is a discharge curve area in a voltage range of 2.0 V to 4.6 V of a dQ / dV graph obtained by differentiating a graph of battery discharge capacity Q and voltage V after one cycle which are measured while charging the lithium secondary battery at 0.1 C to 4.6 V and then discharging the lithium secondary battery at 0.1 C to 2.0 V, and B is a discharge curve area in a voltage range of 2.0 V to 3.5 V of the dQ / dV graph.

The present disclosure provides a sodium battery cathode electrode material, which has a chemical formula as follows:xNaMBO3.yNa2Ti3O7.zNa3V2(BO3)3 / C, wherein the mole number ratio of x to y to z is 0.94-0.96:0.02-0.03:0.02-0.03; M is Fe and Mn, and the mole number ratio of Fe to Mn is 8-9:1-2; and the mass fraction of carbon in the sodium battery cathode electrode material is 1.2% to 1.5%. The sodium battery cathode electrode material provided by the present disclosure is high in capacity, high in voltage platform, stable in structure and high in cycle performance, and the preparation method is simple, low in cost and short in process flow.

The invention relates to the technical field of lithium ion battery negative electrode materials, in particular to a nano-boron-loaded two-dimensional material compound and a preparation method and application thereof. The preparation method of the nano-boron-loaded two-dimensional material compound comprises the following steps: S1, jointly dissolving boron powder and an etching agent in an organic solvent, carrying out ultrasonication, then adding an antioxidant, stirring, centrifuging, and taking supernate to obtain a nano-boron solution; s2, adding a surfactant into the two-dimensional material single-layer dispersion liquid, uniformly mixing, adding into the nano-boron solution, stirring under the condition of protective gas, and finally drying to obtain the nano-boron loaded two-dimensional material compound. The nano boron loaded two-dimensional material compound provided by the invention has the advantages of simple process, low synthesis temperature, uniform chemical components of synthesized powder, good crystal morphology, high phase purity and the like. And when being used as a negative electrode material, the composite material has a better activation effect on electrochemical inertness of boron, so that the battery has relatively high energy density and power performance.