58 results about "Electrochemical supercapacitor" patented technology

Asymmetric supercapacitors comprise: a positive electrode comprising a current collector and a first active material selected from the group consisting of manganese dioxide, silver oxide, iron sulfide, lithium manganese oxide, lithium cobalt oxide, lithium nickel oxide, lithium iron phosphate, and a combination comprising at least one of the foregoing active materials; a negative electrode comprising a carbonaceous active material; an aqueous electrolyte solution selected from the group consisting of aqueous solutions of hydroxides of alkali metals, aqueous solutions of carbonates of alkali metals, aqueous solutions of chlorides of alkali metals, aqueous solutions of sulfates of alkali metals, aqueous solutions of nitrates of alkali metals, and a combination comprising at least one of the foregoing aqueous solutions; and a separator plate. Alternatively, the electrolyte can be a non-aqueous ionic conducting electrolyte or a solid electrolyte.

An asymmetric supercapacitor has a positive electrode having a current collector an active material selected from the group consisting of manganese dioxide, silver oxide, iron sulfide and mixtures thereof, a negative electrode having a carbonaceous active material carbon and optional current collector, an electrolyte, and a separator plate. In a preferred embodiment at least one of the electrodes has nanostructured/nanofibrous material and in a more preferred embodiment, both electrodes have nanostructured/nanfibrous material. The electrolyte can be liquid or solid although liquid electrolytes are preferred.

The asymmetric supercapacitor has improved energy density by electrically coupling an electrode of high faradaic capacity such as one having manganese oxide (MnO₂) with an electrode such as carbon that stores charge through charge separation at the electric double-layer. The asymmetric supercapacitor also improves power density by using high surface area nanostructured/nanofibrous electrode materials.

The disclosure relates to asymmetric supercapacitors containing: a positive electrode comprising a current collector and a first active material selected from a layered double hydroxide of formula [M²⁺_1−xM_x³⁺(OH)₂]Aⁿ⁻_x/n·mH₂O where M²⁺ is at least one divalent metal, M³⁺ is at least one trivalent metal and A is an anion of charge n−, where x is greater than zero and less than 1, n is 1, 2, 3 or 4 and m is 0 to 10; LiCoO₂; LiCo_xNi_yO₂ where x and y are greater than zero and less than 1; LiCo_xNi_yM_n(1−x−y)O₂ where x and y are greater than zero and less than 1; CoS_x where x is from 1 to 1.5; MoS; Zn; activated carbon and graphite; a negative electrode containing a material selected from a carbonaceous active material, MoO₃ and Li_1xMoO_6−x/2; an aqueous electrolyte solution or a non-aqueous ionic conducting electrolyte solution containing a salt and a salt and a non-aqueous solution; and a separator plate. Alternatively, the electrolyte can be a solid electrolyte.

A hybrid lead-acid battery/electrochemical capacitor electrical energy storage device. The lead-acid battery and electrochemical capacitor reside in the same case and are electrically connected. Preferably, a hybrid device of the present invention includes at least one non-polarizable positive electrode, at least one non-polarizable negative electrode, and at least one polarizable electric double layer negative electrode. Separators reside between the electrodes and the separators and electrodes are impregnated with an aqueous sulfuric acid electrolyte. A hybrid device of the present invention exhibits high power characteristics.

Provided is a new charge storage device structure, incorporating a double layer supercapacitor (DLS) material, electrochemical supercapacitor (ECS) material and/or battery material. More specifically, the DLS material, ECS material and/or battery material may form multilayer electrode structures. Additionally or alternatively, the DLS material, ECS material and/or battery material may form electrode structures in which the DLS material, ECS material and/or battery material are in contact with both a common current collector and electrolyte. The present invention can be generalized towards other energy storage devices, opening a new avenue for a large spectrum of device applications.

The disclosure relates to asymmetric supercapacitors containing: a positive electrode comprising a current collector and a first active material selected from a layered double hydroxide of formula [M2+1-xMx3+(OH)2]An-x/n.mH2O where M2+ is at least one divalent metal, M3+ is at least one trivalent metal and A is an anion of charge n-, where x is greater than zero and less than 1, n is 1, 2, 3 or 4 and m is 0 to 10; LiCoO2; LiCoxNiyO2 where x and y are greater than zero and less than 1; LiCoxNiyMn(1-x-y)O2 where x and y are greater than zero and less than 1; CoSx where x is from 1 to 1.5; MoS; Zn; activated carbon and graphite; a negative electrode containing a material selected from a carbonaceous active material, MoO3 and Li1xMoO6-x/2; an aqueous electrolyte solution or a non-aqueous ionic conducting electrolyte solution containing a salt and a salt and a non-aqueous solution; and a separator plate. Alternatively, the electrolyte can be a solid electrolyte.

The invention discloses a manganese dioxide electrochemical supercapacitor, comprising the following steps: the pseudocapacitance of the manganese dioxide and a double electrode layer capacitance mechanism of large specific surface area carbon material are combined into a maintaining power, the positive electrode adopts manganese dioxide material with high capacity, the negative electrode adopts high large specific surface area carbon material, an aqueous solution system or a non-aqueous solution system containing bivalent cations, thus forming the asymmetric electrochemical capacitor. As different materials are adopted in different electrochemical windows of the same electrolyte, individual voltage of the asymmetric electrochemical capacitor can be up to 2V or more, and as the bivalent cations are adopted as the cations of the electrolyte, the specific capacity of the positive electrode and the negative electrode are improved; therefore, the supercapacitor is characterized of high energy density and high power density, etc.

An electrode comprises an electrically conductive substrate, a layer of energy accumulating redox polymer deposited onto the substrate, the redox polymer comprising a polymer metal complex with a substituted tetra-dentate Schiff's base selected from the group: poly-[Me(R, R′—Y)], wherein Me is a transition metal; Y is a bridge group binding the atoms of Nitrogen in the Schiff's base; R is an electron-donating substituent comprising a functional group (X)O—, —COO(X), where (X) is an alkali metal; R′ is Hydrogen or Halogen; and wherein

the polymer metal complex has the following structure:

The electrochemical capacitor comprises a case housing the above-described positive electrode and a negative electrode disposed inside the case, and an electrolyte filling the space between the electrodes.

The invention relates to the supercapacitor technical field, in particular to a carbon-based supercapacitor based on polyacrylamide gel electrolyte and a preparation method thereof. The carbon-based supercapacitor mainly consists of a capacitor shell, and electrodes, diaphragms and electrolyte which are placed in the capacitor shell. The electrodes are carbon nanotube-carbon fiber composite material electrodes, the electrolyte is polyacrylamide gel, and the capacitor shell is made from any one of polyvinyl alcohol, polymethyl methacrylate, polycarbonate, polyvinyl chloride, polyethylene, polypropylene or polystyrene. Compared with the prior art, the electrochemical supercapacitor prepared by the method can be rapidly charged and discharged, and has the advantages of wide window voltage range, higher specific capacitance ranging from 20F/g to 50F/g and good electrochemical capacitor properties.

A preparation method of a NixV-LDH/C composite material belongs to the technical field of an electrode material of an electrochemical supercapacitor. The composite material is in a state of accumulated nanosheets, and the effect of coordination between double-electric-layer energy storage and pseudo-capacitance energy storage is achieved. The surface of acetylene black is oxidized, the acetylene black is taken as a substrate, and then anchoring and synthesis of NixV-LDH are conducted on the surface of the acetylene black through coprecipitation. In this way, the NixV-LDH/C composite material is obtained. The advantages of the method are that the preparation process is simple, and the cost is low; and controllable preparation of a series of NixV-LDH/C composite electrode materials is realized by micro-regulation and control of preparation conditions, then macro-regulation and control of the electrochemical performance of the materials is achieved, and the electrode materials with high specific volume and stable electrochemical performance are screened.

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 method for preparing a non-symmetrical electrochemical supercapacitor and electrode materials, and the method comprises the steps of crushing petroleum coke, drying, mixing with an activator according to the proportion, heating, activating, cooling, then using hydrochloric acid for washing, and further using deionized water for washing prepared activated carbon till neutral; carrying out high-temperature graphitization on the obtained activated carbon; and adopting the activated carbon and the graphitized activated carbon for producing a positive electrode and a negative electrode respectively, and finally assembling the non-symmetrical electrochemical supercapacitor. The method can improve the working voltage by 1.1V and improve the specific energy by 8.2 times in comparison with the method of assembling an electric double-layer capacitor by adopting the pure activated carbon, and be used for producing the electrochemical supercapacitor with high specific energy, high power and long service life.

The invention relates to application of rice-husk-based activated carbon materials to an asymmetric electrochemical supercapacitor, belongs to the technical field of chemical power sources, and aims to provide an asymmetric electrochemical supercapacitor on the basis of rice-husk-based activated carbon. The asymmetric electrochemical supercapacitor comprises a positive pole, a negative pole, a diaphragm, electrolyte, a positive lead, a negative lead and a shell. The positive pole or the negative pole of the asymmetric electrochemical supercapacitor contains the rice-husk-based activated carbon which is used as an activated substance, the pole containing the rice-husk-based activated carbon is used for implementing an electric double-layer energy storage principle, the other pole is a pseudo-capacitive pole or battery pole, and the electrolyte is aqueous electrolyte or organic electrolyte. The asymmetric electrochemical supercapacitor has the advantages that the electric double-layer energy storage pole of the asymmetric electrochemical supercapacitor is made of the rice-husk-based activated carbon which has wide raw material sources and is advantageous in terms of price, accordingly, the cost of the electrochemical supercapacitor can be lowered, and the application range of the rice-husk-based activated carbon which is made of agricultural waste is broadened.

The invention discloses a green cycle process for preparing an activated carbon material for supercapacitors by using rice husks, and belongs to the technical field of comprehensive utilization of resources and electrochemical supercapacitors. The method comprises the following steps: carbonizing rice husks under the protection of inert gas so as to obtain a carbonized product, adding alkali into the carbonized product, and sequentially activating, washing, filtrating and drying so as to obtain high-specific-capacitance rice husk charcoal; adding hydrochloric acid into filtrate for acidifying, and sequentially aging, filtrating, washing and drying so as to obtain nano-silica; carrying out impurity removal, concentration, primary refining, secondary refining and electrolysis on the filtrate so as to obtain dilute alkali liquor, evaporating and crystallizing the dilute alkali liquor so as to obtain alkali, taking the obtained alkali as an activator used in the activation process, and taking water obtained in the process of evaporation as water for washing, so that the cyclic utilization of alkali and water is realized. According to the invention, capacitance charcoal capable of being used for the supercapacitors is prepared by using cheap rice husks; silicon-containing waste liquid can be converted into nano-silica, so that the green conversion of high-value-added rice husks is realized, therefore, the green cycle process has a high economic benefit.

The invention discloses a system and method for online monitoring the charging state of an energy storage device by a fiber. The system comprises a light source, a polarizer, a polarization controller, a fiber circulator, a fiber sensor probe, an electrochemical supercapacitor device, a fiber optical spectrometer and an electrochemical workstation, the light source, the polarizer, the polarizationcontroller, the fiber circulator and the fiber sensor probe are sequentially connected, the fiber optical spectrometer is connected with the fiber circulator, the electrochemical supercapacitor device is connected with the electrochemical workstation, and the fiber sensor probe is placed in an electrochemical supercapacitor device. The fine fiber-like fiber sensing probe is used to transmit an optical signal, acts as the sensing probe to acquire light wave information in order to monitor the potential of a supercapacitor during charging and discharging and the real-time stored electricity amount information in real time, can be implanted in a small space to achieve in-situ measurement, and also can simultaneously measure changes of multiple parameters in real time, such as the charge state, the potential, temperature and other pieces of information.

The invention relates to a device of the hybrid supercapacitor type comprising at least one cell comprising:

• • a porous positive electrode comprising activated carbon;
  • a negative electrode comprising a carbonaceous material capable of inserting an alkaline element other than lithium, this carbonaceous material being different from the activated carbon used at the positive electrode; and
  • a non-aqueous electrolyte comprising a salt selected from salts of an alkaline metal other than lithium.

A preparation method for a nanometer graded porous carbon material used for a high-performance electrochemical supercapacitor based on rice hull ash is disclosed, relating to the preparation of the nanometer graded porous carbon material. The preparation method comprises the following steps: 1, performing pore-forming on raw materials; 2, activating the pore-formed products; 3, performing vacuum drying; and 4, carbonizing the activated product to obtain the required nanometer porous carbon material. The preparation method takes the rice hull ash as the raw materials to prepare the nanometer graded porous carbon material that is applied to the electrochemical supercapacitor; the preparation method has the characteristics of simple operation, low production cost, resource conservation and capability of promoting commercialization and protecting the environment; and in addition, the nanometer graded porous carbon material is higher in the degree of graphitization, better in the multi-level porous channel structure, and higher in the specific capacity and stability.

The invention relates to a preparation method of an activated carbon/metal nitride composite electrode material for the supercapacitor. The method comprises the following steps: mechanically mixing metal, metal oxide, organic metal complex or metal salt and activated carbon, drying and performing heat treatment to a sample at 300-1300 DEG C under nitrogen atmosphere or the mixed gas atmosphere of nitrogen and hydrogen, wherein the weight of metal, metal oxide, organic metal complex or metal salt accounts for 0.5-10% of the total weight. The specific energy of the metal nitride-loaded activated carbon composite electrode material prepared by the invention is 1.7-3.1 times of that of the pure activated carbon electrode. The activated carbon/metal nitride composite electrode material has the advantages of simple preparation method, low cost, excellent performance and the like and is an electrochemical supercapacitor electrode material with wide prospect.

The invention discloses an in-situ preparation method of an electrode of an electrochemical capacitor. The method comprises the following steps: nickel foam is taken as a conductive substrate, and thesurface of the nickel foam is nanocrystallized through electrochemical cyclic voltammetry firstly; then the nickel foam is immersed into a mixed precursor solution containing nickel salt, cobalt salt, glucose and dicyandiamide, dried and pyrolyzed at high temperature, and hollow nanocarbon tubes (NiCoN-C/nano-G-Ni) supported on the nickel foam and doped with nickel-cobalt-nitrogen are obtained; NiCoN-C/nano-G-Ni is immersed into a manganese acetate solution at 40 DEG C and a potassium permanganate solution at 80 DEG C sequentially, dried and subjected to heat treatment at 250 DEG C, manganesedioxide is firmly inlaid in the surfaces of the hollow carbon tubes, and a manganese dioxide/nickel cobalt nitrogen-hollow carbon tube compound MnO2/NiCoN-C/nano-G-Ni with the nickel foam as the substrate is obtained and can serve directly as an electrode material of an electrochemical supercapacitor. Troublesome common preparation steps for the electrode material are reduced, the problems of performance degradation of an active material and the like are solved, and the material has great practical application significance.

The invention discloses a MnO2-porous polyaniline composite electrode as well as a preparation method and an application thereof. The composite oxide electrode comprises a current collector as well as MnO2 and a polyaniline fiber covering layer which are attached to the current collector, and the electrode contains no adhesives. The preparation method of the MnO2 composite electrode comprises steps as follows: a MnO2 layer is formed on the current collector through electrochemical deposition; the current collector with the MnO2 deposition layer is put in an aniline sulfate solution, and the porous polyaniline fiber deposition layer is deposited on the outer side of the MnO2 layer through electrokinetic potential deposition, so that the MnO2 composite electrode is obtained. The MnO2 composite electrode can be used for preparing an electrochemical supercapacitor and has the advantages of high specific capacitance, simple preparation process and the like.