38results about How to "Increase the specific capacity of lithium storage" patented technology

The invention relates to the technical field of lithium-ion cathode material, in particular to silicon cathode material coated with graphene and a preparation method of the silicon cathode material coated with the grapheme. The preparation method comprises the following steps: A, preparing oxidized graphene suspension liquid; B, preparing nanometer silicon particle suspension liquid; and C, preparing silicon cathode material coated with grapheme. The preparation method adopts the electrostatic self-assembly synthetic technology and is wide in source of raw material, low in price, simple in synthetic method, easy for control of process conditions, strong in operability and good in repeatability. The silicon cathode material coated with grapheme is high in specific capacity and good in cycle performance and rate capability, wherein the specific discharge capacity for the first time under the electric current density of 0.01-1.2V, 200mA / g can reach 2746mAh / g, and the specific discharge capacity after 100 times of cycles can maintain 803.8mAh / g.

The invention relates to the technical field of a lithium ion battery, and aims at providing a preparation method of a lithium-ion perfluorinated sulfonic acid resin cladding aluminum-lithium alloy material. The preparation method comprises the following steps: preparing a tetrahydrofuran solution of lithium aluminum hydride, preparing a macroporous carbon material, adding the macroporous carbon material to the tetrahydrofuran solution of the lithium aluminum hydride to prepare a macroporous carbon supported lithium aluminum hydride composite material and further to obtain a macroporous carbon supported aluminum-lithium composite material; preparing a Li<+> perfluorinated sulfonic acid resin solution, and preparing the macroporous carbon supported Li<+> perfluorinated sulfonic acid resin cladding aluminum-lithium alloy composite material by virtue of the Li<+> perfluorinated sulfonic acid resin solution and the macroporous carbon supported aluminum-lithium composite material. The prepared lithium-ion perfluorinated sulfonic acid resin cladding aluminum-lithium alloy material has the advantages that organic electrolyte is safer when being applied to the battery; the electrode reaction reversibility is good; the chemical stability and thermal stability are good; the price is low, and easiness in preparation can be realized; no pollution is caused; safety of the lithium ion battery can be improved by virtue of oxidation resistance.

The invention relates to the technical field of electrochemical materials, in particular to a preparation method for an ordered macroporous titanium dioxide, which includes the following steps: titanium halide and hydrolytic titanate are respectively added into absolute ethanol and uniformly agitated, so that titanium dioxide precursor solvent is obtained; carboxylic acid type polystyrene spheres are dispersed into absolute ethanol, so that carboxylic acid type polystyrene sphere suspension is obtained; the titanium dioxide precursor solvent and the carboxylic acid type polystyrene sphere suspension are mixed together and dried in an oven, so that titanium dioxide precursor is obtained, the titanium dioxide precursor is calcined under high temperature, and thereby the ordered macroporous titanium dioxide is obtained. The template method is adopted by the preparation method, the process conditions are simple and easy to control, operability is high, and repeatability is good; the produced product has an ordered macroporous structure, which enlarges the specific surface area of the titanium dioxide and is favorable for the increase of the specific lithium storage capacity of the product and the permeation of electrolyte, consequently, the electronic conductivity of the ordered macroporous titanium dioxide used as a lithium ion electrode material is increased, and moreover, safety is high.

The invention relates to a preparation method of a carbon-coated titanium dioxide aerogel lithium ion battery anode material and belongs to the fields of nano material preparation and electrochemicalmaterials. The preparation method comprises the following steps: mixing a titanium source, a hydrochloric acid water solution and absolute ethanol according to a certain mol ratio to obtain a first reaction solution; mixing the first reaction solution with a certain amount of a hydrous ethanol solution, and allowing the mixed solution to stand and age to obtain xerogel; mixing an organic carbon precursor and an organic solvent according to a certain mol ratio to obtain a second reaction solution; mixing and heating the obtained xerogel and the second reaction solution, and after reaction ends,performing supercritical drying with carbon dioxide to obtain organic compound titanium dioxide aerogel; and performing high-temperature heat treatment on the aerogel under an inert gas condition toobtain the carbon-coated titanium dioxide aerogel. The carbon-coated titanium dioxide aerogel prepared by the preparation method still maintains high specific capacity of 133mAh / g after 3000 times ofcirculation under 10C high current density, and the carbon-coated titanium dioxide aerogel can serve as a high-performance lithium ion battery anode material.

The invention discloses a preparation method of lithium titanate with special morphology. The method comprises the following steps of: crushing a biomass material, then carrying out ultrasonic dispersion on the crushed biomass material in a lithium acetate ethanol solution and adding tetrabutyl titanate drop by drop according to the mol ratio of Li to Ti being 0.8-0.84; continuously stirring for 5-10 minutes and then heating and evaporating solvent to obtain a precursor of the lithium titanate; and calcining the precursor of the lithium titanate in the air and then cooling the clacined precursor to be room temperature to obtain the lithium titanate with tubular, sheet or porous structure. According to the method disclosed by the invention, the tetrabutyl titanate is taken as a raw material, has low price and wide sources; and the green and toxic-free biomass material is taken as a template, thus the lithium titanate with special morphology is synthesized at lower temperature. The method has the advantages of simpleness, strong maneuverability, favorable repetitiveness, easiness for industrial production and wide application prospect.

The invention provides an iron-cobalt double metal selenide nanometer material, a preparation method thereof and a lithium ion battery. The preparation method of the iron-cobalt double metal selenide nanomaterial provided by the invention comprises: heating and reacting iron acetylacetonate, cobalt acetylacetonate and dibenzyl diselenide in a solvent to form Fe 2 CoSe 4 nanomaterials. The present invention uses specific iron acetylacetonate, nickel acetylacetonate and dibenzyldiselenide as precursor sources, reacts in a solvent system, and can directly synthesize Fe in one step. 2 CoSe 4 nanomaterials, which greatly simplifies the operation and can effectively improve the Fe 2 CoSe 4 Crystallinity and purity of nanomaterials. Fe obtained by the present invention 2 CoSe 4 Nanomaterials are used as anode materials for lithium-ion batteries, which can improve the lithium storage specific capacity, rate performance and cycle performance of the battery.

The invention relates to the technical field of lithium-sulfur batteries, and aims to provide a method for preparing membrane electrodes of lithium-sulfur batteries. The preparation method of the membrane electrode of the lithium-sulfur battery comprises the steps of: preparing a carbon material with nanometer ferrous sulfide dispersed on the surface of the carbon carrier, and then using the carbon material to prepare a positive electrode material; then preparing the positive electrode and the negative electrode, and the lithium ion exchange membrane respectively, Finally, the positive electrode, negative electrode and lithium ion exchange membrane are pressed into a lithium-sulfur battery membrane electrode. The lithium-sulfur battery membrane electrode prepared by the invention has: good electrical conductivity, very low internal resistance; good electrode reaction reversibility; good chemical stability and thermal stability; cheap and easy to prepare; pollution-free; battery manufacturing The process is simple, conducive to large-scale production, and can effectively reduce production costs.

The invention discloses a SiCO-carbon nanotube composite film electrode for a lithium battery, which is characterized in that it comprises a single crystal silicon substrate (1), on which a TiN barrier layer (2), Cu Thin film layer (3), CuO thin film layer (4), SiCO thin film layer A (5), Ni catalyst layer (6), carbon nanotube layer (7) and SiCO thin film layer B (8). The invention can not only effectively improve the cycle stability of the electrode, but also greatly reduce the thickness of the single layer film, and can obtain a larger thickness of the thin film system, thereby improving the electrochemical performance of the material during high-rate charge and discharge.

The invention discloses a metastable-state tin-based alloy material and a preparation method thereof. The material mainly comprises two metal elements of Sn and Ni and also possibly comprises elementssuch as Fe, and Co, the metastable-state tin-based alloy material with a main phase being MSn5 is formed, and M is Ni, Fe<0.5>Ni<0.5> and Co<0.5>Ni<0.5>. By introducing a crystal seed during the synthesis process, a tin-based alloy new phase taking tin and nickel as main and difficult to synthesize by a traditional method is induced to be formed, and the method provides a new method and idea forsynthesis of other metastable-state materials particularly the metastable-state tin-based alloy material. The MSn5 alloy material can be used as a lithium / sodium ion battery active negative electrodematerial, Sn agglomeration can be suppressed due to the existence of non-active M metal, and the cycle stability of the material is improved.