39 results about "Electrochemical capacitance" patented technology

Disclosed herein are methods for producing electrodes comprising single-layer 1T′-transition metal dichalcogenide (TMD) nanosheets. The method includes filtering a suspension of single-layer 1T′-TMD nanosheets over a polymeric substrate to produce the electrode, wherein, the single-layer 1T′-TMD nanosheets of the electrode are no more than 1,000 nm in thickness; the electrode comprises at least 70% 1T′-phase; and the electrode has a calculated electrochemical active surface area (ECSA) that is about 10-fold higher than that of a control electrode, which comprises 2H-TMD nanosheets. Also disclosed herein are methods for deionizing a fluid. The method includes steps of discharging the fluid in an electrochemical capacitor at a constant voltage of no more than 0.5 V to deionize the fluid, wherein the electrochemical capacitor is characterized in having the electrode comprising single-layer 1T′-TMD nanosheets produced by the present method.

The embodiment of the invention discloses a battery charging and discharging power estimation method, electronic equipment and a readable storage medium. The method comprises the following steps: determining an impedance parameter of an equivalent circuit model of a battery according to at least one of the temperature, the state of charge and the rate of the battery; wherein the impedance parameters comprise at least one of ohmic impedance, electrochemical polarization impedance, electrochemical capacitance, concentration polarization impedance and concentration capacitance; according to the impedance parameter, the open-circuit voltage of the battery and the current of the battery, the charging power or the discharging power of the battery is estimated, the charging and discharging power of the battery is estimated under the condition of the dynamic voltage of the battery, and the accuracy of the charging and discharging power estimation of the battery is improved.

The invention relates to the field of carbon nanomaterials, in particular to a three-dimensional carbon tube grid membrane with a micro-nano hierarchical pore structure and a preparation method and application thereof. Three-dimensional porous aluminum oxide is used as a template for confinement deposition of a carbon layer, a three-dimensional interconnected carbon tube grid film is prepared after the template is removed, the surface of the carbon tube grid film is sequentially ablated by laser ablation, and micron-sized pits and nano-pores close to the thickness range of the surface layers of the pits are formed in an irradiation area. And preparing the three-dimensional interconnected carbon tube grid film based on the micron-sized pit array. The preparation method is easy and convenient to operate and good in repeatability, the specific surface area of the material is increased through the hierarchical pore structure, when the membrane material is used as an electrode, the area specific capacitance can be improved while the frequency response performance is obtained, and the membrane material can be used for an alternating-current filter capacitor and a quick-response electrochemical energy storage device. The problems that when an existing carbon nanotube array is used as an electrochemical capacitor electrode, the load is low, the area specific capacity is small, the frequency response capacity is poor, and high-power energy storage equipment is difficult to meet are solved.

The invention relates to a solar charging circuit, a method, a power supply device and equipment, and the solar charging circuit carries out the boosting of a solar electric signal outputted by a solar panel through a boosting charging module under the control of a solar charging enabling end, and outputs a boosting charging signal to an electrochemical capacitor module. The electrochemical capacitor module charges an electrochemical container in the electrochemical capacitor module according to the boost charging signal so as to realize low-temperature charging, and the linear charging module charges the electrochemical container in the electrochemical capacitor module according to the battery temperature corresponding to the lithium battery under the control of the capacitor charging enable signal end. A battery charging signal is output to a lithium battery module based on a capacitor voltage signal provided by an electrochemical hybrid capacitor, so that the lithium battery module charges a lithium battery according to the battery charging signal, the lithium battery is charged by using the electric quantity stored by the electrochemical hybrid capacitor, and the energy of solar energy can be further utilized to a greater extent; and the endurance time of the battery is prolonged.

The application belongs to the field of membrane separation technology, and provides a preparation method and application method of a two-dimensional MXene-conductive polymer layered separation membrane with adjustable pore size. The two-dimensional MXene-conductive polymer layered separation membrane is a two-dimensional MXene membrane prepared by vacuum-assisted filtration, and a conductive polymer monomer is embedded between the membrane layers, and then prepared by in-situ electrochemical polymerization. The advantages are that the preparation is simple and easy to operate, and no expensive equipment is needed. The conductive polymer in the membrane layer greatly improves the mechanical stability and oxidation resistance of the membrane structure, and the conductive performance and electrochemical capacitance characteristics are excellent. The membrane can be used as a desalination membrane and a conductive electrode at the same time, an electric potential can be applied to the membrane surface, the membrane pore size can be controlled by electrochemical regulation, and the selective separation of monovalent salt, divalent salt and dye molecules can be realized.

A preparation method for a positive electrode. The preparation method comprises: subjecting a three-dimensional porous carbon material and chained conductive carbon black to dry-state mechanical kneading and mixing in a cloth bag, then adding the resulting mixture to deionized water containing a binder in one time, and stirring same at a high speed to form a viscous slurry; coating the slurry onto two surfaces of an aluminum foil current collector, and drying and shaping same to form a first electrode layer; subjecting a multi-element lithium oxide, a P-t-P conductive agent and a binder to dry-state mechanical mixing in a cloth bag, then adding the resulting mixture to a solvent containing 2,5-dimethylpyrrolidine (NMP) in one time, and stirring same at a high speed to form a viscous slurry; coating the slurry onto two surfaces of the first electrode layer, and drying and shaping same to form a second electrode layer; and rolling the obtained electrode on a Cr-coated roller press to a designed thickness, so as to form the positive electrode of an electrochemical capacitor. The prepared electrochemical capacitor has the characteristics of a high specific capacitance and low self-discharge, and has good market application prospects.

The invention relates to the technical field of capacitors, and discloses an electrochemical capacitor which comprises a capacitor body, a first explosion-proof mechanism is arranged outside the capacitor body, and a second explosion-proof mechanism is arranged outside the first explosion-proof mechanism. According to the electrochemical capacitor, the protective alloy steel shell and the sealing alloy steel plate are made of alloy materials, good toughness and strength are achieved, the anti-impact effect can be improved, the heat dissipation fan conducts air cooling heat dissipation on the capacitor body, the electric air cylinder pushes the anti-smoke baffle to block the heat dissipation through holes, smoke dispersion and explosion scrap splashing are prevented, and the service life of the capacitor is prolonged. The first anti-explosion reinforcing ribs and the second anti-explosion reinforcing ribs improve the overall anti-explosion performance, the titanium alloy shells have the effects of being light in weight, high in strength and resistant to corrosion, external protection is provided conveniently, the honeycomb air bag is arranged between the titanium alloy shells, shock waves of explosion can be buffered and absorbed conveniently, and the service life of the honeycomb air bag is prolonged. And the first ventilation opening and the second ventilation opening are sealed by the protective blocking shell, so that the chippings are further prevented from splashing.

This electrochemical capacitor is provided with: a positive electrode including a positive electrode current collector and a positive electrode mixture layer that contains activated carbon and is supported on the positive electrode current collector; a negative electrode containing a negative electrode current collector and a negative electrode mixture layer that contains a negative electrode active material reversibly doped with lithium ions and is supported by the negative electrode current collector; and an electrolyte solution containing a nonaqueous solvent and an electrolyte containing lithium ions and anions, the ratio of the amount of anions to the surface area of the positive electrode mixture layer being 1.5-2.4 [mu] mol / m2.

A disclosed electrochemical capacitor includes a positive electrode, a negative electrode, a separator, and an electrolyte having lithium ion conductivity. The positive electrode includes a positive electrode current collector and a positive electrode mixture layer that is carried on the positive electrode current collector and that undergoes reversible anion doping. The negative electrode includes a negative electrode current collector and a negative electrode mixture layer that is carried on the negative electrode current collector and that undergoes reversible lithium ion doping. The negative electrode mixture layer contains a negative electrode active material, a conductive agent, a binder, and a dispersant. The ratio of the mass of the dispersant to the mass of the negative electrode mixture layer is greater than the ratio of the mass of the binder to the mass of the negative electrode mixture layer.

An electrochemical capacitor includes a positive electrode, a negative electrode, and an electrolyte. The electrolyte contains a lactone compound and an additive. The additive is at least one selected from the group consisting of a siloxane compound and a silyl fluoride compound.

The layered material (1a) has a layer (10). The layer (10) has a main body (11) and a terminal (12). The main body (11) has M1 (1‑a)m M2 am X n The composition. In this composition, M1 and M2 are different atoms selected from Ti, Sc, Y, La, Zr and Hf. X contains at least one of carbon and nitrogen atoms. a is greater than 0 and less than 1. n is greater than 1 and less than 4. m is greater than n and less than 5. Terminal (12) is present on the surface of the body (11).

The utility model discloses a PFPI membrane for an energy battery, which comprises a battery shell, a plurality of positive pole layers and negative pole layers are coaxially arranged in the battery shell, the positive pole layers and the negative pole layers are staggered and crossed, the PFPI membrane is arranged between the positive pole layers and the negative pole layers, and the PFPI membrane is processed by taking a PI membrane as a base material. According to the utility model, the PFPI film is adopted to replace a PP (Polypropylene), PE (Polyethylene) or PET (Polyethylene Terephthalate) film in a traditional battery, and the excellent performance of the PFPI film is utilized, so that the defects of explosion, fire, detonation and the like caused by high-energy charging and discharging of the traditional battery are avoided, and the safety performance of the lithium ion battery and a super capacitor (also called as an electrochemical capacitor) is improved.

The invention discloses a high surface capacity capacitive type electrochemical capacitor electrode and a preparation method thereof, and the preparation method comprises the following steps: (1) dissolving Ni (NO3) 3, NH4F and urea in deionized water, then adding nickel foam, and carrying out hydrothermal reaction treatment to obtain a Ni (OH) 2 / nickel foam precursor; (2) washing and drying the Ni (OH) 2 / nickel foam precursor, and then depositing a MoO3 thin layer on the Ni (OH) 2 / nickel foam precursor by adopting an atomic layer deposition method to obtain a composite precursor; and (3) annealing the composite precursor in a mixed atmosphere of NH3 and Ar to obtain the high-surface-capacity capacitive electrochemical capacitor electrode. The electrode prepared by the invention shows high specific capacity, excellent rate capability and long-term cycling stability in a water-based hybrid capacitor, the capacity retention rate can reach about 80% after cycling for 7000 times under a high-rate charge-discharge condition, and stable output performance is maintained under high-power instantaneous discharge.

An electrochemical capacitor includes: a positive electrode; a negative electrode; a separator disposed between the positive electrode and the negative electrode; and an electrolytic solution. The electrolytic solution contains a lactone compound. A capacity of the positive electrode is greater than the capacity of the negative electrode and is less than or equal to 1.6 times the capacity of the negative electrode.

The present invention discloses a hydroxide electrode and a preparation method thereof. The preparation method of the hydroxide electrode comprises the following steps: placing a nickel oxalate electrode in an immersion solution for 4-10 hours, washing it after removal until the washing solution is neutral, and drying it to obtain the hydroxide electrode; the immersion solution is obtained by dissolving K2S2O8 and NaOH in water. The method of the present invention is simple to operate, economical, and environmentally friendly, and does not require a binder or a conductive agent. The prepared Ni(OH)2 nanosheet electrode material exhibits excellent performance and has a current density of 2mA / cm 2 The specific capacitance was measured to be 4878mF / cm 2 The method of the present invention is also applicable to other electrode materials based on nickel foam, providing reference value for the preparation of related electrode materials and offering great potential for them to be used as active electrodes of electrochemical capacitors.

This electrochemical capacitor includes a polarizable electrode layer. The polarizable electrode layer contains activated carbon. The BET specific surface area Sb of the activated carbon is less than 2,000 m2 / g. The ratio Sa / Sb of the external specific surface area Sa of the activated carbon obtained through the t-plot method to the BET specific surface area Sb of the activated carbon is 0.10 or more.

Described herein are electrochemical capacitive biosensors, methods of making same, and methods of using same. The electrochemical capacitive biosensors are especially useful for detecting pathogens, including viruses, bacteria, and allergens, in aerosols and complex biological media.

The invention belongs to the technical field of semiconductor material characterization, and relates to an antimonide material carrier concentration detection method. The method comprises the following steps: growing a first antimony-containing compound material layer on a conductive gallium antimonide substrate; performing an electrochemical capacitance-voltage test on the first antimony-containing compound material layer to obtain a first carrier concentration value; growing a second antimony-containing compound material layer on the semi-insulating gallium arsenide substrate; performing a Hall effect test on the second antimony-containing compound material layer to obtain a second carrier concentration value; obtaining a carrier concentration correction factor based on the ratio of the second carrier concentration value to the first carrier concentration value; growing an antimony-containing compound material layer on one side, far away from the substrate, of the first antimony-containing compound material layer and / or the second antimony-containing compound material layer, and performing electrochemical capacitance-voltage test on each antimony-containing compound material layer to obtain a corresponding carrier concentration value; and obtaining the carrier concentration of each antimony-containing compound material layer based on the carrier concentration value and the carrier concentration correction factor.

The disclosed electrochemical capacitor comprises: a positive electrode provided with a positive electrode current collector and a positive electrode mixture layer that is supported on the positive electrode current collector and that is reversibly doped with anions; the negative electrode is provided with a negative electrode current collector and a negative electrode mixture layer that is supported on the negative electrode current collector and that is reversibly doped with lithium ions, and the negative electrode mixture layer contains a negative electrode active material, a conductive auxiliary agent, a binder, and a dispersant. The ratio of the mass of the dispersant to the mass of the negative electrode mixture layer is greater than the ratio of the mass of the binder to the mass of the negative electrode mixture layer.

Described herein are electrochemical capacitive biosensors, methods of making same, and methods of using same. The electrochemical capacitive biosensors are especially useful for detecting pathogens, including viruses, bacteria, and allergens, in aerosols and complex biological media.

A composite comprises vertically aligned carbon nanotubes (VACNT) on a substrate and additional disordered carbon deposited on the outer face of the nanotubes. This additional carbon is not amorphous but comprises graphitic domains. This composite can be prepared by a chemical vapor deposition (CVD) process in the presence of a catalyst on a metal substrate at atmospheric pressure. It can be used as an electrode in electronic and electrotechnical devices, such as supercapacitors.

The disclosed electrochemical capacitor has a pair of electrodes and an electrolyte. At least one of the pair of electrodes includes a current collector and an active layer disposed on a surface of the current collector. The active layer includes activated carbon and a dispersant. The activated carbon includes a first metal. The ratio of the first metal in the activated carbon is 10 ppm or more on a mass basis. The dispersant includes at least one selected from the group consisting of carboxyalkyl cellulose and an ammonium salt of carboxyalkyl cellulose.

Carbonized cellulose fiber electrodes for high-frequency electrochemical capacitors and method for fabricating the same is disclosed. The method includes carbonizing a cellulose fiber substrate by subjecting the cellulose fiber substrate to a rapid pyrolysis process in a preheated furnace having an inert environment at a pyrolysis temperature of at least 1000° C., resulting in a carbonized cellulose substrate. The method also includes preparing a hydrothermal solution, and depositing vertically oriented nanoflakes on the carbonized cellulose substrate by immersing the carbonized cellulose substrate in the hydrothermal solution and conducting a hydrothermal reaction, thereby forming the electrode. The vertically oriented nanoflakes may be composed of MoS2. The cellulose fiber substrate may be a cellulose tissue sheet. The electrochemical capacitor includes at least two electrodes, each having vertically oriented nanoflakes deposited on a carbonized cellulose substrate, and an electrolyte positioned between each pair of the at least two electrodes.

The present application relates to a solar energy charging circuit, a method, a power supply apparatus and a device. Under the control of a solar charging enable terminal, the solar energy charging circuit boosts, by means of a boost charging module, a solar electrical signal output by a solar panel, and outputs a boosted charging signal to an electrochemical capacitor module, so that the electrochemical capacitor module charges an electrochemical hybrid capacitor in the electrochemical capacitor module on the basis of the boosted charging signal, so as to achieve low-temperature charging. Moreover, on the basis of a battery temperature corresponding to a lithium battery and under the control of a capacitor charging enable signal terminal, the solar energy charging circuit outputs a battery charging signal to a lithium battery module by means of a linear charging module on the basis of a capacitor voltage signal provided by the electrochemical hybrid capacitor, so that the lithium battery module charges the lithium battery on the basis of the battery charging signal, thereby using electric energy stored in the electrochemical hybrid capacitor to charge the lithium battery, and consequently, solar energy can be utilized more fully, and battery endurance duration is prolonged.

The invention relates to an electrode for a capacitor, a method for manufacturing the same, and an electrochemical capacitor. The capacitor electrode (1) has a current collector (11) and an active material layer (12) formed on the current collector (11). The active material layer (12) contains an active material, a binder, and carbon nanotubes. The content of carbon nanotubes in the active material layer (12) is 0.03% by mass or more and 0.50% by mass or less. In addition, the volume-based median diameter of the carbon nanotubes in a dispersion liquid obtained by dispersing the carbon nanotubes in water is 3.0 [mu] m or more.

This electrochemical capacitor is provided with a first electrode containing a first active material, a second electrode containing a second active material, and an electrolyte solution, the electrolyte solution containing an ionic liquid, and when quantitative analysis is performed on the surface of the first electrode on the basis of a relative sensitivity coefficient using X-ray photoelectron spectroscopy (XPS), the relative sensitivity coefficient is less than the relative sensitivity coefficient. The atomic ratio RF of the element F to the element C derived from the ionic liquid is 10% or more.

Disclosed is an electrochemical capacitor provided with a pair of electrodes and an electrolytic solution. At least one of the pair of electrodes includes a current collector and an active layer provided on the surface of the current collector. The active layer contains activated carbon and a dispersant. The activated carbon includes a first metal. The ratio of the first metal in the activated carbon is 10 ppm or more on a mass basis. The dispersant contains at least one selected from the group consisting of carboxyalkyl cellulose and an ammonium salt of carboxyalkyl cellulose.

The invention discloses a lithium ion battery mechanical property in-situ evaluation method, which comprises the following steps: step 1, taking a plurality of first lithium ion batteries, and carrying out impedance test on the plurality of first lithium ion batteries to correspondingly obtain a plurality of first electrochemical capacitance values; step 2, carrying out different times of charge-discharge cycle tests on the plurality of first lithium ion batteries, and completely discharging after multiple times of cycle tests are completed to obtain a plurality of second lithium ion batteries with different cycle times according to a certain cycle time interval; step 3, carrying out impedance test on the plurality of second lithium ion batteries to correspondingly obtain a plurality of second electrochemical capacitance values; and step 4, calculating a plurality of first and second specific surface area values according to the plurality of first and second electrochemical capacitance values, and evaluating the mechanical property of the battery according to the evolution trend of the difference between the plurality of second and first specific surface area values. By adopting the method, the mechanical property of the battery is rapidly evaluated, reverse optimization of battery design is facilitated, and the product development period is shortened.

A method for preparing surface-modified carbon comprises adding a carbon material to a solution of a reaction product of an aromatic primary amine and a molar excess of a nitrite source, and recovering the surface-modified carbon having redox-active sites. Also provided are surface-modified carbon materials, electrodes, and capacitors based thereon.

The present invention relates to the field of carbon nanomaterials, and specifically to a three-dimensional carbon tube grid membrane with a micro-nano graded pore structure, and a preparation method and application thereof. The present invention uses three-dimensional porous alumina as a template to confine and deposit a carbon layer, and obtains a three-dimensional interconnected carbon tube grid membrane after removing the template. The surface of the carbon tube grid membrane is orderly ablated by laser ablation, and micron-scale pits and nanopores within the thickness range of the surface layer near the pits are formed in the irradiated area, so as to obtain a three-dimensional interconnected carbon tube grid membrane based on a micron-scale pit array. The preparation method is simple to operate and has good repeatability. The graded pore structure increases the specific surface area of ​​the material. When the membrane material is used as an electrode, the area specific capacitance can be improved while obtaining frequency response performance, and it is used for AC filter capacitors and fast-response electrochemical energy storage devices, which solves the problems of low load, small area specific capacitance, poor frequency response capability, and difficulty in meeting the requirements of high-power energy storage devices when the existing carbon nanotube array is used as an electrochemical capacitor electrode.