38 results about "Electrochemical doping" patented technology

The invention discloses composite electrode materials for a high power lithium secondary battery and a preparation method thereof. The composite electrode materials take lithium-storage active material as an inner core, conductive polymer as an outer shell, the active material inner core is mainly used for carrying out electrochemical reaction and providing main capacity for a battery, the conductive polymer material is used as a conductive agent and an adhesive when preparing electrodes, and simultaneously provides a certain amount of battery capacity by electrochemical doping and undoping reaction. By using the composite electrode materials for preparing electrodes, adhesive and conductive agent with electrochemical inertia can not be used or be used in a small amount, and the lithium secondary battery based on the composite electrode materials has high specific capacity and fine rate performance.

A nonaqueous electrolyte secondary battery comprises a cathode having a cathode active material capable of electrochemically doping/dedoping lithium, an anode having an anode active material capable of electrochemically doping/dedoping lithium and a nonaqueous electrolyte interposed between the cathode and the anode. The nonaqueous electrolyte includes at least one or more kinds of vinylene carbonate, methoxybenzene compounds or antioxidants. The nonaqueous electrolyte secondary battery has a good cyclic characteristic under any environment of low temperature, ambient temperature and high temperature.

The present invention relates to the production of electrochemical capacitors with a DEL. The proposed electrodes with DEL are based on non-metal conducting materials, including porous carbon materials, and are capable of providing for high specific energy, capacity and power parameters of electrochemical capacitors. P-type conductivity and high concentration of holes in electrode materials may be provided by thermal, ionic or electrochemical doping by acceptor impurities; irradiating by high-energy fast particles or quantums; or chemical, electrochemical and/or thermal treatment. The present invention allows for an increase in specific energy, capacity and power parameters, as well as a reduction in the cost of various electrochemical capacitors with DEL. The proposed electrodes with DEL can be used as positive and/or negative electrodes of symmetric and asymmetric electrochemical capacitors with aqueous and non-aqueous electrolytes.

The invention discloses a method for preparing a poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) composite modified electrode. The method comprises the following steps of: uniformly mixing PEDOT:PSS aqueous dispersion liquid and Nafion, which are taken as raw materials, and then directly dispensing a mixture on the surface of a composite modified electrode; and in the conventional three-electrode system, performing secondary electrochemical doping by using hydrophobic ionic liquid, and thus obtaining the PEDOT:PSS composite modified electrode which is high in water resistance and high in conductivity. The PEDOT:PSS composite modified electrode which is prepared by the method fully combines the film-forming property of the PEDOT:PSS aqueous dispersion liquid, the adhesion characteristic, biological compatibility and anti-interference characteristic of the Nafion, high conductivity and hydrophobicity of the ionic liquid and the electrochemical catalysis characteristic of a nanometer material, can be applied to electrochemical biosensors or electrochemical sensors, is directly applicable to electrochemical detection of auxin, roxithromycin, vitamin C, benzenediol isomer, organophosphorus, glucose, hydrogen peroxide and the like, and has the characteristics of good detection effect, short response time, high water resistance, wide linear range, high sensitivity, high anti-interference, high stability and the like.

A resistive element in an electrochemical artificial neural network, includes a transition metal oxide thin film forming a working electrode, a pair of first electrodes connected to the working electrode, and a reference electrode for electrochemical doping of the working electrode. The biasing of the pair of first electrodes with respect to the reference electrode according to a determination of conductivity between the pair of first electrodes controls the resistance of the working electrode.

The invention discloses a high energy density lithium secondary battery electrode and a preparation method thereof. The electrode consists of current collector and active material layers adhered on the current collector. The active material layer is made from lithium-storage active material and conductive polymer material, and the mass ratio of the lithium-storage active material and the conductive polymer material is 100:0.1-40. In the invention, the conductive polymer material is adopted as main conductive agent and adhesive, compared with the conductive agent and adhesive of the traditional electrode, the electrode in the invention has high energy density due to that the conductive polymer material can provide a certain amount of reversible capacity for batteries by electrochemical doping and undoping reaction.

In the preparation process of carbon nanotube-polyaniline composite material for super capacitor, polyaniline is deposited onto the surface of carbon nanotube. During charging and discharging, polyaniline produces electrochemical doping-dedoping effect to generate false capacitance and to increase the specific capacitance of carbon nanotube. By means of the selection of the deposited material and the control of the deposition process, the present invention prepares carbon nanotube-polyaniline composite material with excellent performance and greatly raised specific capacitance.

The electrochemical capacitor of the invention comprises a nonaqueous electrolyte and a pair of polarizable electrodes, wherein carbon nanotubes are used as an electrode material for at least one of the positive electrode and the negative electrode, the carbon nanotubes have a specific surface area of at least 700 m²/g and contain semiconductive carbon nanotubes, and the electrode material exhibits a voltage dependency of differential capacity by electrochemical doping.

The electrochemical capacitor solves the problems with activated carbon electrodes and, exploiting the excellent characteristics of carbon nanotubes, has further increased capacitance and increased energy density, therefore realizing a reduced internal resistance and a prolonged service life.

The invention discloses a lithium pre-doping method for an electrode plate of a lithium-ion battery. Lithium pre-doping of the battery electrode plate can be finished through a solution preparation step, an electrode plate soaking step, a washing step and a drying step. The lithium pre-doping method has the advantages that lithium for pre-doping is directly catalyzed in the electrode plate; and compared with an existing electrochemical doping method, the lithium pre-doping method is relatively simple and convenient. The lithium pre-doping method is free of a specific limitation on the electrode plate; a positive electrode and a negative electrode can be simultaneously pre-doped with lithium; and the doping efficiency is improved. A porous foil is adopted by a current collector of the electrode plate disclosed by the invention, transportation of lithium ions is facilitated; the doping time is shortened; and meanwhile, the specific capacity of the electrode plate is increased. The battery prepared by lithium pre-doping has the advantages of high output voltage and high specific capacity, so that the battery has relatively high energy density.

The invention belongs to the field of organic light emission, in particular to an electro-chemical deposition preparation method of high-efficiency organic light emitting film, and an application of the light emitting film in preparing high-efficiency organic electroluminescent light emitting device. The light emitting film is prepared through an electro-chemical deposition method in an electrolytic cell in the following steps: electrolytic solution preparation, electro-chemical deposition, deposition film cleaning and drying and the like; the prepared light emitted film has the advantages of simple process, high light emission rate, small impact of electro-chemical doping on efficiency, easy control of area and size and adjustable light emission color. The light emitting film can be used as a light emission layer in the organic electroluminescent light emitting device, to prepare single-layer or multi-layer high-efficiency organic electroluminescent light emitting devices and obtain dark blue light emission devices; the lumen efficiency of the devices reaches 4.436cd/A which reaches or exceeds the efficiency level of most parts prepared through the traditional part processing technologies.

The present invention relates to a high power energy storage device additive and a lithium ion capacitor including the same, and more particularly, to: a preparation method of a new lithium ion capacitor additive which is added to a carbon-based material applied as a cathode active material of a lithium ion capacitor such that the new lithium ion capacitor additive is capable of improving capacity and energy density by electrochemically doping a lithium ion onto an anode; the lithium ion capacitor additive prepared thereby; and the lithium ion capacitor including the lithium ion capacitor additive.

The lithium ion capacitor additive according to the present invention can release 3 mols or more of lithium ions even at a low voltage of 4.4 V or less, and the lithium ion capacitor including the lithium ion capacitor additive according to the present invention can electrochemically dope lithium onto the anode even without performing a pre-doping process using lithium metal as in the conventional lithium ion capacitor.

The invention relates to an oligothiophene derivative and a preparation method thereof. The preparation method of the oligothiophene derivative mainly comprises the following steps of: dissolving 3TB into dichloromethane, adding NBS (N-bromosuccinimide), stirring and reacting so as to obtain 3TB-3Br; adding EDOT (3,4-ethylenedioxythiophene) and tetrahydrofuran into a three-neck flask, controlling the reaction temperature to be minus 78 DEG C, dropwise adding n-butyllithium, gradually raising to be room temperature after the dropwise adding, and continuously reacting; subsequently decreasing the reaction temperature to be minus 78 DEG C, dropwise adding tributyl stannic chloride, gradually raising to be the room temperature after the dripping, and reacting to obtain an EDOT tin reagent; under the protection of nitrogen, adding methylbenzene into the three-neck flask, further adding the 3TB-3Br and the EDOT tin reagent, carrying out backflow reaction so as to obtain a 3TB-3Br crude product, thus obtaining pure 3TB-3EDOT through separation. As cation (or anion) free radicals generated in electrochemical doping are stable, the oligothiophene derivative can be used as a novel organic electrochromic material.

A soluble donor-acceptor electrochromic polymer (DA-ECP) is prepared that absorbs light throughout at least the majority of the visible range and is essentially black to the human eye when in the neutral state, but is highly transmissive when electrochemically doped. The conjugated polymer has acceptor units separated by sequences of a plurality of donor units. The sequences can be monodispersed or polydispersed. The DA-ECP is prepared by the polycondensation of a plurality of at least one donor-acceptor oligomer (DA-oligomer) that has at least one internal acceptor repeating unit and at least one donor repeating unit on all termini of the oligomer, and optionally, a plurality of at least one donor monomer and/or donor oligomer.

The invention discloses a platinum and polyaniline composite nanofiber three-dimensional functional structure film and a preparation method thereof. The preparation method of the film comprises the following steps: (1) a curing eigenstate polyaniline nanofiber is electrochemically prepared; (2) a conductive polyaniline three-dimensional structure nanofiber structure is prepared through electrochemical doping; and (3) the platinum and polyaniline composite nanofiber three-dimensional functional structure film with wholly platinum-enveloped morphology is prepared through an electrochemical deposition method. The platinum and polyaniline composite nanofiber three-dimensional functional structure film has excellent physical-chemical stability and better catalysis capacity, and can be applied to such biosensors as glucose sensors and lactic acid sensors.

The invention discloses a titanium oxide nanotube-based supercapacitor electrode and a preparation method thereof. At the room temperature, a TiO<2> nanotube prepared by positive electrode oxidizationor various appearance modified TiO<2> nanotubes are subjected to annealing treatment, and then electrochemical reduction doping is performed in a potassium hydroxide solution; next, the product is immersed in a H<2>O<2> water solution for a certain while; and finally, the immersed TiO<2> electrode is applied to preparation of a supercapacitor. By adoption of the method, special equipment is not needed; through electrochemical doping processing in an alkali solution, the conductivity and capacitance of the TiO<2> electrode are improved; through immersion processing of the H<2>O<2> water solution, a parts of crystals on the surface of crystalline state TiO<2> is converted into non-crystals; by virtue of the non-crystal-coated crystal structure, stability of doping state can be facilitated,thereby improving cycle stability of the TiO<2> electrode; by virtue of the electrochemical doping processing in the alkali solution and by combination of immersion of H<2>O<2> water solution, the cycle life of the titanium oxide nanotube-based supercapacitor electrode is highly prolonged, so that the supercapacitor electrode can be well applied to the field of electrochemical energy storage.

The invention relates to preparation of an electrochemical crosslinking type high-performance electrochromic film and a material, and aims at solving the problems that a high-performance non-conjugated electrochromic polymer is tedious in preparation step, high in raw material cost, complex in processing technology and the like, starting from the aspects of molecular design and preparation technology, a non-conjugated polymer capable of being electrochemically crosslinked is selected, and the high-performance non-conjugated electrochromic film is prepared. A stable polymer cross-linked network, namely a brand-new cross-linked polymer electrochromic film, is constructed on a conductive substrate through an electrochemical method. On one hand, the conjugated structure of a polymer color-changing group is enlarged through electrochemical crosslinking, so that the initial oxidation potential is reduced; and on the other hand, the stable cross-linked network also reduces the damage of the electrochemical doping process to the stability of the film. Therefore, the film obtained by the method is simple to prepare and extremely easy to industrialize; and the material has good cycling stability. Through verification, the material has a wide application prospect in the photoelectric fields of electrochromism, supercapacitors, information storage and the like.