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32results about How to "Alleviate structural collapse" patented technology
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MXene/conductive polymer composite aerogel and preparation method thereof
ActiveCN108530889AImprove surface utilizationReduce collapseConductive polymer compositePolymer science
The invention discloses an MXene / conductive polymer composite aerogel. The MXene / conductive polymer composite aerogel is of an integrated three-dimensional grid structure which is formed by insertinglaminated MXene into a conductive polymer aerogel, wherein the conductive polymer comprises one or more of polyaniline, polypyrrole and polythiophene. The invention further discloses a preparation method of the MXene / conductive polymer composite aerogel. The method is characterized in that the MXene and the conductive polymer are mixed with organic solution and then are rapidly cooled and separated under heat inducing and solvent inducing effects under the inert gas protection; then the vacuum drying is carried out to obtain the MXene / conductive polymer composite aerogel.
Owner:BEIJING UNIV OF CHEM TECH
Method for preparing urchin-like vanadium base nanometer electrode material and application of the material
ActiveCN104658771AOmit removal stepStrong controllabilityMaterial nanotechnologyHybrid capacitor electrodesWater bathsSurface-active agents
The invention discloses a method for preparing an urchin-like vanadium base nanometer electrode material and application of the material. The method comprises the steps of adding vanadium pentoxide into aqueous hydrogen peroxide, and performing electromagnetic stirring in water bath to prepare a vanadium precursor solution; taking the vanadium precursor solution, ethylene glycol and deionized water and adding ammonium sulfate, controlling the solution within Ph2.0-3.0, performing electromagnetic stirring to mix the solution, and transferring the solution to a hydrothermal reaction kettle to perform hydrothermal reaction for 5-48h at 160-200 DEG C; centrifuging, washing and drying to prepare the electrode material. The invention further discloses a method for preparing an electrode plate, and the method is characterized in that the urchin-like vanadium base nanometer electrode material is mixed with a binder and a conductive agent according to the weight proportion of (70-80) to (0-10) to 10 and a current collector is coated with the mixture. According to the method, V205 with the relatively low price is regarded as a vanadium source without any surface active agent; the preparation process is simple, efficient, steady and economic, the morphology change of the material is slightly affected by heat treatment, and the prepared urchin-like vanadium base nanometer electrode material has high specific capacity and long cycling life in water electrolyte and organic electrolyte.
Owner:CHONGQING UNIV
A preparation method and application of a flower-like FeSx/C nano composite material
ActiveCN109216684AReduce pollutionSimple manufacturing methodMaterial nanotechnologyNegative electrodesCarbon coatingAlkalinity
The invention belongs to the field of battery electrode materials and relates to a preparation method and application of a flower-shaped FeSx / C nano composite material. The invention adopts one-step hydrothermal method, realizes the synthesis of flower-shaped FeSx / C composite material by regulating reaction temperature, solution acidity and alkalinity, and calcination temperature, and uses the flower-shaped FeSx / C composite material as a negative electrode material for sodium ion battery, wherein the flower-shaped FeSx / C composite material is synthesized by regulating reaction temperature, solution acidity and alkalinity, and calcination temperature. The preparation method of the invention has the advantages that raw materials are easy to obtain, the synthesis method is simple and feasible, the carbon coating effect is good and the repeatability is strong, and the FeSx / C composite material prepared by the invention is used as the negative electrode material of the sodium ion battery, so that the specific capacity of the battery can be effectively improved, and the stability and the rate performance of the battery can be enhanced.
Owner:JIANGSU UNIV
Three-dimensional metal nanowire and preparation method thereof
ActiveCN107309439AGuaranteed normal growthImprove cycle stabilityMaterial nanotechnologyTransportation and packagingAlloyNon magnetic
The invention discloses a three-dimensional metal nanowire and a preparation method thereof. The preparation method comprises the following steps that S1, a metal ion solution with the concentration being 0.01-1 mol / L is prepared, a complexing agent and a nucleating agent are added, and a solution A is obtained by adjusting the pH value to be 10.0-13.5 through an alkaline solution, and magnetic metal ions or mixtures of magnetic metal ions and nonmagnetic metal ions are used as the metal ions; S2, a reducing agent solution with the concentration being 0.1-3 mol / L and with high reduction property is prepared, and a solution B is obtained by adjusting the pH value to be 10.0-13.5 through an alkaline solution; and S3, a reactor is provided, a base subjected to activation treatment is placed in the reactor, the solution A and the solution B are poured into the reactor, fully mixed, and reacted for T time under the 0.005-1 T magnetic field condition at 50-100 DEG C, and reaction stoste containing the three-dimensional metal nanowire formed by magnetic metal nanowires or alloy nanowires is obtained. Through the preparation method, the three-dimensional-structure metal nanowire arranged orderly can be prepared.
Owner:SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
Preparation method of rare earth metal doped high-nickel ternary battery positive electrode material
PendingCN111009656AReduce shuffling effectMaintain sintering activitySecondary cellsPositive electrodesRare-earth elementElectrical battery
The invention discloses a preparation method of a rare earth metal doped high-nickel ternary battery positive electrode material. The method provided by the invention comprises the following steps: adding a doped coating agent for low-temperature presintering, crushing and grinding for the first time, adding an oxidant for high-temperature sintering, and crushing and grinding again to obtain a finished product. According to the method provided by the invention, a rare earth compound ceric ammonium nitrate Ce(NH4)2(NO3)6 which is doped with a rare earth metal oxide and has oxidability is addedin the sintering process of the ternary material, so that divalent Ni in the ternary material is oxidized by an oxidant, and the Li / Ni mixed arrangement phenomenon is weakened; and the doped rare earth element compound further reduces the internal resistance of the ternary battery material and improves the internal chemical stability of the whole battery.
Owner:凤阳泰和九思科技有限公司
Carbon layer coated nano manganous-manganic oxide shell-core structure material and preparation method thereof
ActiveCN112382747APreserve biological formPromote growthMaterial nanotechnologySecondary cellsCarbon layerNanoshell
The invention relates to a carbon layer coated nano Mn3O4 shell-core structure material as well as a preparation method and application thereof. The nano Mn3O4@C material is synthesized by taking plant cell tissues as a structure-directing agent through dipping and step-by-step calcining. The synthesized material retains the biological form of a template, oxide nanoparticles and thin-layer biocharare formed in the step-by-step calcination process, retention of the biochar promotes Mn3O4 nano dispersion and grain growth, and the obtained material is uniform and free of obvious agglomeration. In the charging and discharging process of the battery, the biochar can effectively relieve structural collapse caused by lattice shrinkage in the lithium ion deintercalation process and provide support and protection for volume change, and in the circulation process, the carbon layer can limit nanoparticle aggregation and volume expansion and improve the performance of the battery. When the material is used as a lithium ion battery negative electrode material, after 250 cycles, the specific capacity is stabilized at 840 mAhg<-1>, and the cycle Coulombic efficiency is stabilized at 99%.
Owner:SUZHOU UNIV OF SCI & TECH
Preparation method and application of self-supporting flexible polyaniline supercapacitor material
InactiveCN112038108AImprove conductivityImprove mechanical propertiesMaterial nanotechnologyHybrid capacitor electrolytesElectrolytic agentPolymer science
The invention belongs to the technical field of preparation of flexible self-supporting supercapacitors, and discloses a preparation method and application of a self-supporting flexible polyaniline supercapacitor material. The preparation method comprises the following steps: preparing a polyaniline conductive polymer from PVA, phytic acid and triaminobenzeneboronic acid serving as dopants and cross-linking agents through an oxidative polymerization reaction; preparing an electrode; dissolving sulfuric acid in water to prepare a sulfuric acid electrolyte with a concentration of 1 mol / L; and preparing the self-supporting flexible conductive polymer supercapacitor material. According to the invention, a three-dimensional cross-linked conductive polymer micro-nano structure is obtained by utilizing supramolecular doping, and the three-dimensional cross-linked conductive polymer micro-nano structure has good conductivity and specific surface area and has relatively good specific capacity;since PVA and triaminobenzeneboronic acid are added, the flexibility of polyaniline is greatly improved through covalent bonds, and flexibility and self-supporting are achieved; and by adjusting the conductivity and flexible performance, a current collector is not needed in design and preparation, weight is reduced, and the energy density of the whole device is improved.
Owner:SHANDONG UNIV OF SCI & TECH
Lithium manganese silicate/carbon composite material doped with alkaline-earth metal ions and preparing method thereof
ActiveCN107546386AImproved magnification performanceHigh activityMaterial nanotechnologyCell electrodesCarbon compositesAlkaline earth metal
The invention provides a lithium manganese silicate / carbon composite material doped with alkaline-earth metal ions and a preparing method thereof. The chemical formula of the material is Li2Mn(1-x)MxSiO4 / C, wherein 0<x<=0.10, and M is selected from one of Mg, Ca, Sr or Ba. The material displays [001] spots with axes under a high-resolution transmission electron microscopy, and is prepared based on the principle of a hydrothermal method. The lithium manganese silicate / carbon composite material is uniform in shape and high in degree of crystallinity, [001] crystal faces are exposed, and due todoping of alkaline-earth metal elements, the lattice constants of the material are changed; meanwhile, all the elements show the features that concentrations are distributed in a gradient mode, thus promoting of electrical conductivity is facilitated, and the material has excellent electrochemical performance under high magnification.
Owner:CENT SOUTH UNIV
Lithium ion battery with high cycle performance
ActiveCN112599729AImprove hydrophilicityAlleviate chalking problemsCell electrodesSecondary cellsCarbon layerLithium-ion battery
The invention relates to a preparation method of a lithium ion battery negative electrode material, and a lithium ion battery. The preparation method of the negative electrode comprises the followingsteps: adding a certain amount of Ti3AlC2 into a mixed solution of LiF and HCl, and reacting to obtain accordion-shaped Ti3C2; adding Ni salt and acrylic acid into the obtained Ti3C2 turbid liquid, and carrying out irradiation in gamma rays generated by <60>Co; and pouring the turbid liquid into liquid nitrogen for quick freezing, then freeze-drying the obtained product, and finally coating the Ti3C2-NiO with a carbon layer by adopting a CVD method. According to the invention, the prepared composite material NiO particles are uniformly dispersed among three-dimensional accordion-shaped Ti3C2 sheet-shaped gaps, so that material pulverization and structure collapse caused by the volume expansion effect of NiO in the charging and discharging process are effectively relieved, and the conductivity of NiO is effectively improved through the Ti3C2 and CVD carbon layer.
Owner:重庆标能瑞源储能技术研究院有限公司
Preparation method and application of carbon-coated manganese selenide hollow cubic three-dimensional material
ActiveCN110828818BSimple preparation processSynthetic conditions are mildNegative electrodesSecondary cellsManganese(II) carbonateElectrical battery
Owner:ZHENGZHOU UNIV
A kind of graphite composite negative electrode material and preparation method thereof
ActiveCN106450311BChange the local charge densityIncreased electron transport capacityCell electrodesSecondary cellsElectrolytic agentSimple Organic Compounds
The invention relates to a graphite composite anode material and a preparation method thereof. The graphite composite anode material is of a core-shell structure and comprises an inner core and an outer shell, wherein the inner core is graphite; the outer shell is a nitrogen and phosphorus-doped composite material layer; the nitrogen and phosphorus-doped composite material layer is formed by adding the graphite serving as a raw material into nitrogen-containing ionic liquid in which a phosphorus-containing organic compound, a surfactant and lithium salt are dispersed and sintering; the mass ratio of the phosphorus-containing organic compound to the surfactant to the lithium salt to the nitrogen-containing ionic liquid is (10-50):(1-5):(1-5):200. The graphite composite anode material provided by the invention has the advantages that the transmission rate of lithium ions under the condition of high magnification can be improved, and the compatibility of the graphite composite anode material with an electrolyte can also be improved, so that the cycle performance is improved; the lithium salt in the outer shell can provide sufficient lithium ions, so that the first-time efficiency and the cycle performance are improved.
Owner:陕西君和聚源科技有限公司
a flower-like fes x Preparation method and application of /c nanocomposite material
ActiveCN109216684BGood electrical contactInhibit sheddingMaterial nanotechnologyNegative electrodesCarbon coatingElectrical battery
The invention belongs to the field of battery electrode materials and relates to a preparation method and application of a flower-shaped FeSx / C nano composite material. The invention adopts one-step hydrothermal method, realizes the synthesis of flower-shaped FeSx / C composite material by regulating reaction temperature, solution acidity and alkalinity, and calcination temperature, and uses the flower-shaped FeSx / C composite material as a negative electrode material for sodium ion battery, wherein the flower-shaped FeSx / C composite material is synthesized by regulating reaction temperature, solution acidity and alkalinity, and calcination temperature. The preparation method of the invention has the advantages that raw materials are easy to obtain, the synthesis method is simple and feasible, the carbon coating effect is good and the repeatability is strong, and the FeSx / C composite material prepared by the invention is used as the negative electrode material of the sodium ion battery, so that the specific capacity of the battery can be effectively improved, and the stability and the rate performance of the battery can be enhanced.
Owner:JIANGSU UNIV
A kind of double metal selenide material wrapped in graphene and its preparation method and application
ActiveCN110660981BMesoporousLarge specific surface areaNegative electrodesSecondary cellsNickel saltPyrrolidinones
The invention discloses a graphene-wrapped double metal selenide material, a preparation method and an application thereof. The preparation method comprises the following steps: (1) performing solvothermal reaction of cobalt salt, nickel salt, polyvinylpyrrolidone and trimesic acid in a solvent to obtain a reaction product NiCo-MOF; (2) subjecting NiCo-MOF to selenium oxidation and carbonization treatment to obtain the product NiCoSe 4 ; (3) NiCoSe 4 Solvothermal reaction with graphene oxide GO to obtain graphene-wrapped double metal selenide materials. The graphene-wrapped double metal selenide material provided by the present invention has mesoporous properties and a large specific surface area, which not only increases the interaction between sodium ions and the surface, enhances electrical conductivity, but also alleviates the volume expansion of the double metal selenide during charge and discharge. The resulting structural collapse effectively improves the cycle performance of the battery.
Owner:SOUTH CHINA UNIV OF TECH +1
Preparation method and application of a sea urchin-like vanadium-based nano-electrode material
ActiveCN104658771BOmit removal stepStrong controllabilityHybrid capacitor electrodesHybrid/EDL manufactureWater bathsAqueous electrolyte
The invention discloses a preparation method and application of a sea urchin-shaped vanadium-based nano-electrode material. First, vanadium pentoxide is added into a hydrogen peroxide solution, and a vanadium precursor solution is prepared by electromagnetic stirring in a water bath; and then the vanadium precursor solution, Ethylene glycol and deionized water were added, and ammonium sulfate was added to control the pH of the solution to 2.0~3.0. After mixing the solution with electromagnetic stirring, it was transferred to a hydrothermal reactor for hydrothermal reaction at 160~200 °C for 5~48 h; It is obtained by centrifugation, washing and drying; it is also disclosed that the sea urchin-shaped vanadium-based nano-electrode material is mixed with a binder and a conductive agent in a weight ratio of 70-80:20-10:10, and is coated on the current collector to prepare a electrode pads. The invention uses V2O5 with a lower price as the vanadium source, does not need any surfactant, the preparation process is simple, efficient, stable and economical, and the heat treatment has little influence on the change of the material morphology. Both electrolytes have high specific capacity and long cycle life.
Owner:CHONGQING UNIV
Carbon layer-coated nano-manganese tetraoxide shell-core structure material and preparation method thereof
ActiveCN112382747BPreserve biological formPromote growthMaterial nanotechnologyNegative electrodesCarbon layerElectrical battery
Owner:SUZHOU UNIV OF SCI & TECH
A kind of nano-rod-shaped manganese-chromium composite oxide low-temperature denitrification catalyst and its preparation method
ActiveCN108404906BStable structureSimple preparation processGas treatmentDispersed particle separationPtru catalystManganese oxide
The invention belongs to the field of flue gas denitration, and in particular relates to a nanorod-shaped manganese-chromium composite oxide low-temperature denitration catalyst and a preparation method. Using potassium permanganate and chromium nitrate as raw materials, a new rod-shaped Mn-Cr composite oxide catalyst with a stable structure and composed of manganese oxide and chromium oxide was prepared through a hydrothermal synthesis method. The preparation process of the present invention is simple, economical, does not require any template, the catalyst is easy to shape, enhances the catalyst's ability to transfer electrons and ions to store oxygen, effectively reduces the active reaction temperature, greatly improves the thermal stability and service life of the catalyst, and increases Denitrification activity and sulfur resistance, and wide activity window.
Owner:CHANGZHOU UNIV
A kind of positive electrode material with core-shell structure, its preparation method and application in lithium ion battery
ActiveCN110993950BAlleviate structural collapseImprove electrochemical performanceCell electrodesSecondary cellsCarbon coatingPhysical chemistry
The invention discloses a positive electrode material with a core-shell structure, a preparation method thereof and an application in a lithium ion battery. The positive electrode material with a core-shell structure includes a carbon coating layer, and an active material core located in the carbon coating layer, and the number of the active material cores is at least two. The positive electrode material of the present invention has a core-shell structure, which can completely cover the material to form a three-dimensional structure, and can alleviate the structural collapse caused by the volume change in the process of material deintercalation of lithium; and at least two spheres composed of active material cores The structure has a certain space to accommodate more electrolyte, which improves the liquid retention capacity, and also has the advantages of high electrical conductivity and high mechanical strength.
Owner:HUBEI JINQUAN NEW MATERIALS CO LTD
A kind of preparation method of graphite negative electrode material used in lithium ion battery
ActiveCN106410197BImprove conductivityStrong support frameCell electrodesSecondary cellsActive agentAdhesive
The invention provides a preparation method of a graphite negative electrode material for a lithium-ion battery. The method comprises three processes of conductive adhesive preparation, colloidal graphite composite material preparation and porous graphite negative electrode material preparation, wherein an aqueous solvent, a composite conductive agent and a binder are used in the conductive adhesive preparation process; graphite and a conductive adhesive are used in the colloidal graphite composite material preparation process; and a colloidal graphite composite material, an active agent and double-distilled water are used in the porous graphite negative electrode material preparation process. According to the preparation method, a layer of conductive adhesive which is good in conductivity and easy to activate coats the surface of the graphite; activated carbon is activated through activation to generate nanopores which are relatively small in aperture and is decomposed with the binder in the conductive adhesive to leave micro-pores which are relatively large in aperture; and the nanopores generate a synergistic effect in the lithium-ion battery, so that the prepared graphite negative electrode material has the characteristics of high liquid absorption and retention capacity, high compaction density, high conductivity, good cycle performance and the like.
Owner:JIANGXI JIAYE LITHIUM BATTERY NEW ENERGY TECH CO LTD
A kind of cathode material, its preparation method and lithium ion battery
ActiveCN111628165BAlleviate structural collapseLarge specific surface areaSecondary cellsPositive electrodesElectrical batteryDodecahedron
The present invention relates to a positive electrode material, a preparation method thereof and a lithium ion battery. The positive electrode material includes a dodecahedron skeleton and a positive electrode active material; the positive electrode active material is disposed on the surface and inside of the dodecahedron skeleton. In the present invention, the positive electrode active material is arranged on the surface and inside of the dodecahedron skeleton (three-dimensional structure), and this structure can effectively alleviate the structural collapse caused by the volume change of the positive electrode material during the process of material de-intercalation; meanwhile, the dodecahedron structure has The larger specific surface area can accommodate more electrolyte, improve the liquid retention capacity, and also has high electrical conductivity and high mechanical strength.
Owner:HUBEI JINQUAN NEW MATERIALS CO LTD
Tremella-like MoS2/functionalized activated carbon sodium-ion battery negative electrode material and preparation method thereof
InactiveCN113745508AImprove stabilityGood dispersionSecondary cellsNegative electrodesActivated carbonNano structuring
The invention discloses a tremella-like MoS2 / functionalized activated carbon sodium-ion battery negative electrode material and a preparation method thereof, firstly, activated carbon is subjected to surface treatment by using an improved Hummers method, and the obtained functionalized activated carbon is rougher in surface and rich in active functional groups; then, the Mo source and the S source are nucleated and grow on nucleation sites in the heating process through a one-step solvothermal method, the surface of the HFAC is gradually covered, the synthesized MoS2 / HFAC is of a tremella-shaped structure, the surface of the synthesized MoS2 / HFAC is full of MoS2 nanosheets, the HFAC is used for fixing the nanostructure of MoS2 and ensuring good dispersity, the HFAC and MoS2 are connected through a C-O-Mo bond, stable interface bonding is achieved. According to the present invention, the structure collapse caused by sheet layer stacking is effectively relieved, the stability of the composite material is improved, the method has characteristics of simple operation, low cost, high yield and good repeatability, and the material has characteristics of high specific capacity and excellent cycle stability when the material is used as the sodium ion battery negative electrode material.
Owner:SHAANXI UNIV OF SCI & TECH +1
Method for preparing bacterial cellulose/NBSK (Northern Bleached Softwood Kraft) aerogel spheres under assistance of cation solution
ActiveCN105950681AImprove production rateAlleviate structural collapseMicroorganism based processesFermentationSolventBottle
The invention relates to a method for preparing bacterial cellulose / NBSK (Northern Bleached Softwood Kraft) aerogel spheres under the assistance of a cation solution. The method comprises the following steps: inoculating acetobacter xylinum into a liquid seed culture medium, and culturing statically to obtain seed liquid; adding NBSK or modified NBSK and a liquid fermentation culture medium into a conical bottle, adjusting the pH to 5.6-7.0, and performing sterilizing treatment; inoculating the seed liquid, and dynamically culturing to obtain the bacterial cellulose / NBSK hydrogel spheres, treating the hydrogel spheres with sodium hydroxide, washing, soaking into deionized water, dropwise adding the cation solution, reacting in a shaking table, adjusting the pH value of the system to an alkaline state, and soaking; taking the hydrogel spheres out, and drying with a solvent to obtain the bacterial cellulose / NBSK aerogel spheres. In the method, large-sized instruments are not needed, and only an ordinary reflux condensation device is needed during drying; the finished product rate of the prepared bacterial cellulose / NBSK aerogel spheres can be up to 50-65 percent.
Owner:DONGHUA UNIV
A lithium-ion battery with high cycle performance
ActiveCN112599729BImprove hydrophilicityAlleviate chalking problemsCell electrodesSecondary cellsCarbon layerElectrical battery
The invention relates to a preparation method of a negative electrode material of a lithium ion battery and a lithium ion battery. The preparation method of the negative electrode includes the following steps: a certain amount of Ti 3 AlC 2 Add and react with LiF and HCl mixture to obtain accordion-shaped Ti 3 C 2 ; will get Ti 3 C 2 Add Ni salt and acrylic acid to the suspension, and 60 Irradiation was carried out in γ-rays produced by Co; then the suspension was poured into liquid nitrogen for rapid freezing, and then the obtained product was freeze-dried, and finally CVD was used on Ti 3 C 2 ‑NiO is covered with a carbon layer; the NiO particles of the composite material prepared by the present invention are uniformly dispersed in the three-dimensional accordion-shaped Ti 3 C 2 Between the flaky gaps, the volume expansion effect of NiO in the charge and discharge process is effectively alleviated, which leads to material pulverization and structural collapse. Ti 3 C 2 and CVD carbon layer effectively improved the conductivity of NiO.
Owner:重庆标能瑞源储能技术研究院有限公司
A kind of mxene/conductive polymer composite airgel and preparation method thereof
ActiveCN108530889BImprove surface utilizationReduce collapsePolymer scienceConductive polymer composite
The invention discloses an MXene / conductive polymer composite aerogel. The MXene / conductive polymer composite aerogel is of an integrated three-dimensional grid structure which is formed by insertinglaminated MXene into a conductive polymer aerogel, wherein the conductive polymer comprises one or more of polyaniline, polypyrrole and polythiophene. The invention further discloses a preparation method of the MXene / conductive polymer composite aerogel. The method is characterized in that the MXene and the conductive polymer are mixed with organic solution and then are rapidly cooled and separated under heat inducing and solvent inducing effects under the inert gas protection; then the vacuum drying is carried out to obtain the MXene / conductive polymer composite aerogel.
Owner:BEIJING UNIV OF CHEM TECH
A lithium silica permanganate -lithium siliconate/carbon composite material and preparation method of alkaline soil metal ions
ActiveCN107546386BImproved magnification performanceHigh activityMaterial nanotechnologyCell electrodesCarbon compositesAlkaline earth metal
The invention provides a lithium manganese silicate / carbon composite material doped with alkaline-earth metal ions and a preparing method thereof. The chemical formula of the material is Li2Mn(1-x)MxSiO4 / C, wherein 0<x<=0.10, and M is selected from one of Mg, Ca, Sr or Ba. The material displays [001] spots with axes under a high-resolution transmission electron microscopy, and is prepared based on the principle of a hydrothermal method. The lithium manganese silicate / carbon composite material is uniform in shape and high in degree of crystallinity, [001] crystal faces are exposed, and due todoping of alkaline-earth metal elements, the lattice constants of the material are changed; meanwhile, all the elements show the features that concentrations are distributed in a gradient mode, thus promoting of electrical conductivity is facilitated, and the material has excellent electrochemical performance under high magnification.
Owner:CENT SOUTH UNIV
A kind of three-dimensional metal nanowire and its preparation method
ActiveCN107309439BGuaranteed normal growthImprove cycle stabilityMaterial nanotechnologyTransportation and packagingAlloyNon magnetic
The invention discloses a three-dimensional metal nanowire and a preparation method thereof. The preparation method includes the following steps: S1, preparing a metal ion solution with a concentration of 0.01-1 mol / L, adding a complexing agent and a nucleating agent, and adjusting the pH value to 10.0-13.5 through an alkali solution to prepare a solution; wherein, the The metal ions are magnetic metal ions or a mixture of magnetic metal ions and non-magnetic metal ions; S2, prepare a strong reductive reducing agent solution of 0.1 to 3 mol / L, adjust the alkali solution to adjust the pH value to 10.0 to 13.5, and prepare B solution ; S3, providing a reaction vessel, placing the activated substrate in the reaction vessel, fully mixing the A solution and the B solution in the reaction vessel, Under the condition of a 1T magnetic field, react for T time to prepare a reaction stock solution containing three-dimensional metal nanowires constructed of magnetic metal nanowires or alloy nanowires. The preparation method of the invention can prepare orderly arranged three-dimensional structure metal nanowires.
Owner:SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
A cationic solution-assisted method for preparing bacterial cellulose/nbsk airgel balls
ActiveCN105950681BImprove production rateAlleviate structural collapseMicroorganism based processesFermentationBottleSolvent
The invention relates to a method for preparing bacterial cellulose / NBSK (Northern Bleached Softwood Kraft) aerogel spheres under the assistance of a cation solution. The method comprises the following steps: inoculating acetobacter xylinum into a liquid seed culture medium, and culturing statically to obtain seed liquid; adding NBSK or modified NBSK and a liquid fermentation culture medium into a conical bottle, adjusting the pH to 5.6-7.0, and performing sterilizing treatment; inoculating the seed liquid, and dynamically culturing to obtain the bacterial cellulose / NBSK hydrogel spheres, treating the hydrogel spheres with sodium hydroxide, washing, soaking into deionized water, dropwise adding the cation solution, reacting in a shaking table, adjusting the pH value of the system to an alkaline state, and soaking; taking the hydrogel spheres out, and drying with a solvent to obtain the bacterial cellulose / NBSK aerogel spheres. In the method, large-sized instruments are not needed, and only an ordinary reflux condensation device is needed during drying; the finished product rate of the prepared bacterial cellulose / NBSK aerogel spheres can be up to 50-65 percent.
Owner:DONGHUA UNIV
a kind of nico 2 the s 4 Preparation method of carbon airgel composite electrode material
ActiveCN110310834BSimple processLarge specific surface areaHybrid capacitor electrodesComposite electrodeThiourea
The present invention is a kind of NiCo 2 S 4 Preparation method of carbon airgel composite electrode material. The method comprises the following steps: adding a divalent Ni salt compound and a divalent Co salt compound into a solvent to obtain a mixed solution, stirring at a stirring speed of 20 to 50 r / min for 0.5 to 3 hours, and then adding thiourea to obtain a precursor solution; Put the precursor solution and the block watermelon rind into the reaction kettle, and conduct a hydrothermal reaction at 160-200°C for 6-18 hours, then freeze-dry the product, heat-preserve and calcinate it at 350-450°C for 1-3 hours, and then cool to room temperature, the final product is NiCo 2 S 4 / Carbon airgel composites. The NiCo prepared by the present invention 2 S 4 / Carbon airgel composite material is easy to operate and pollution-free, and the obtained composite material has excellent electrochemical performance.
Owner:HEBEI UNIV OF TECH
Cathode material, preparation method thereof and lithium ion battery
ActiveCN111628165AImprove liquid retention capacityImprove conductivitySecondary cellsPositive electrodesElectrical batteryElectrically conductive
The invention relates to a positive electrode material, a preparation method thereof and a lithium ion battery. The positive electrode material comprises a dodecahedron skeleton and a positive electrode active material, and the positive electrode active material is arranged on the surface and inside the dodecahedron skeleton. The positive electrode active material is arranged on the surface and inside the dodecahedron skeleton (three-dimensional structure), and the structure can effectively relieve structural collapse caused by volume change of the positive electrode material in the lithium de-intercalation and intercalation process of the material. Meanwhile, the dodecahedron structure has a large specific surface area, can contain more electrolyte, improves the liquid retention capability, and also has high conductivity and high mechanical strength.
Owner:HUBEI JINQUAN NEW MATERIALS CO LTD
Preparation and application of multi-shell CuCo2O4 hollow nanosphere
InactiveCN109755032AAlleviate structural collapseImprove cycle stabilityHybrid capacitor electrodesHybrid/EDL manufactureActive siteCopper
The invention discloses preparation and application of a multi-shell CuCo2O4 hollow nanosphere. The preparation comprises the following steps: firstly preparing a copper alkoxide hollow nanosphere inone step by utilizing a hydrothermal process and taking the prepared copper alkoxide hollow nanosphere as a precursor; regulating and controlling hydrothermal reaction time, so that core-shell, double-shell and three-shell precursors can be obtained; and then sintering the precursors in the air to obtain CuCo2O4 of a hollow structure. The prepared CuCo2O4 hollow nanosphere has the characteristicsof high specific surface area, regulatable shell number and abundant active sites, so that specific capacity of a supercapacitor is effectively improved. Besides, a stable shell and cavity structure can effectively alleviate collapse of an electrode material structure in charging and discharging processes of the supercapacitor, and then cycling stability of the supercapacitor is obviously improved. The preparation method is simple to operate, has good repeatability and is easy for large scale production.
Owner:SOUTHEAST UNIV
A kind of sulfur composite material for lithium-sulfur battery and preparation method thereof
ActiveCN110931758BAlleviate structural collapseImprove stabilityCell electrodesLi-accumulatorsLithium–sulfur batteryNanoparticle
The invention relates to a sulfur composite material for lithium-sulfur batteries and a preparation method thereof. The sulfur composite material includes a carrier and an active material loaded on the surface of the carrier, the active material is sulfur, and the carrier is composed of nanoparticle materials, Composition of linear nanomaterials and layered nanomaterials. The present invention constructs a multi-dimensional carrier through nanomaterials with different microscopic morphology structures, which can significantly increase the content of active substance sulfur in the composite material, and form a good The electronically conductive network improves the charge-discharge cycle performance of lithium-sulfur batteries. The sulfur content in the multi-dimensional sulfur composite material prepared by the invention can be as high as over 90%, and the initial discharge specific capacity of the composite material can reach 1290mAh / g.
Owner:CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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