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3343 results about "Electrolytic cell" patented technology

An electrolytic cell is an electrochemical cell that drives a non-spontaneous redox reaction through the application of electrical energy. They are often used to decompose chemical compounds, in a process called electrolysis—the Greek word lysis means to break up.

NANO silicon-carbon composite material and preparation method thereof

The invention relates to a nano silicon-carbon composite negative material for lithium ion batteries and a preparation method thereof. A porous electrode composed of silica and carbon is taken as a raw material, and a nano silicon-carbon composite material of carbon-loaded nano silicon is formed by a molten salt electrolysis method in a manner of silica in-situ electrochemical reduction. Silicon and carbon of the material are connected by nano silicon carbide, and are metallurgical-grade combination, so that the electrochemical cycle stability of the nano silicon-carbon composite material is improved. The preparation method of the nano silicon-carbon composite material provided by the invention comprises the following steps: compounding a porous block composed of carbon and silica powder with a conductive cathode collector as a cathode; using graphite or an inert anode as an anode, and putting the cathode and anode into CaCl2 electrolyte or mixed salt melt electrolyte containing CaCl2 to form an electrolytic cell; applying voltage between the cathode and the anode; controlling the electrolytic voltage, the electrolytic current density and the electrolytic quantity, so that silica in the porous block is deoxidized into nano silicon by electrolytic reduction, and the nano silicon-carbon composite material for lithium ion batteries is prepared at the cathode.

Preparation method of lithium metal through electrolysis

The invention discloses a preparation method of lithium metal through electrolysis, which comprises the following steps: at normal temperature and normal pressure, applying direct current voltage on an anode current collector and a cathode current collector so that potassium ions in a water phase in an anode chamber penetrate through a diaphragm having lithium ion conductor characteristics under the driving of the voltage, an organic solvent in a cathode chamber is reduced to a metal lithium single substance which is deposited and enriched on the surface of the cathode current collector to obtain the product, wherein the anode chamber of an electrolysis cell is filled with an aqueous solution at least containing the lithium ions, the cathode chamber od the electrolysis cell is filled with the organic solvent having the lithium ion conductor characteristics, the diaphragm for separating the anode chamber from the cathode chamber is a lithium ion conductor ceramic membrane having the lithium ion conductor characteristics or a composite membrane of a lithium ion conductor and a polymer, and the cathode chamber is in inert gas atmosphere. The electrolysis preparation method for lithium metal avoids severe conditions which are required to prepare lithium metal by a traditional high temperature molten electrolysis process, and has the characteristics of low energy consumption, high lithium extraction efficiency and high product purity and is environment-friendly and wide in raw material sources.

Method for pre-lithiating electrode material of lithium ion battery

The invention relates to an electrode material of a lithium ion battery, in particular to a method for pre-lithiating a cathode material. The method comprises the steps that an electrolytic cell cathode cavity is made of the electrode material such as a lithium ion cathode material and arranged in a lithium ion conductive organic electrolyte; an anode cavity is an aqueous solution containing lithium salt or an organic solution; the anode cavity is separated from the cathode cavity by a lithium ion conductor ceramic membrane or a composite membrane of lithium ion conductor ceramic and a high molecular material; an electric potential and current density are controlled by external circuit charge and discharge equipment to allow lithium ions to migrate to a cathode from an anode through the membrane; and an SEI (Solid Electrolyte Interphase) membrane is formed on the surface of the material; or the electrode material is pre-lithiated. According to the method, a cheap and safe lithium ion saline solution serves as a source of the lithium ion; the SEI membrane is generated for the cathode of the lithium ion battery in advance; or lithium is supplemented to the electrode material; the coulombic efficiency and cycling stability of the cathode material can be improved; a formation process in production of the lithium ion battery in the prior art is simplified; the electrode material and cost are saved; and the method is safe and efficient and has a large-scale application prospect.

Preparation method of lithium hexafluorophosphate

The invention relates to a preparation method of lithium hexafluorophosphate. The preparation method comprises the following steps of: (1) distilling to obtain hydrogen fluoride liquid of which the purity is over 99.99 weight percent; (2) reacting the high-purity hydrogen fluoride liquid with phosphorus pentachloride to obtain mixed gas of the phosphorus pentafluoride and hydrogen chloride; (3) introducing the mixed gas of the phosphorus pentachloride and the hydrogen chloride into hydrogen fluoride and lithium fluoride, reacting at a certain temperature and under certain pressure to obtain solution of lithium hexafluorophosphate, exhausting hydrogen chloride gas at regular time, and absorbing by using water to prepare byproduct hydrochloric acid; and (4) crystallizing and separating, namely filtering the solution of lithium hexafluorophosphate, delivering filtrate into a crystallizing slot, separating the lithium hexafluorophosphate out at the temperature of between -70 and 80 DEG C, filtering, and performing primary drying and secondary drying to obtain a lithium hexafluorophosphate product, wherein the residual hydrogen fluoride gas is displaced by nitrogen. The preparation method has readily available raw materials and is easy to operate, the purity of the obtained lithium hexafluorophosphate product is over 99.9 percent, the moisture is lower than 10ppm, and the production requirements of lithium ion electrolytic cells are met.

Electrolytic extraction and detection method of nonmetallic inclusion in steel by utilizing organic solution

ActiveCN102213654AReduce and stabilize liquid junction potentialAvoid destructionElectrolysis componentsPreparing sample for investigationFiltrationSalt bridge
The invention relates to an electrolytic extraction and detection method of nonmetallic inclusion in steel by utilizing an organic solution. The method comprises the following process steps: (1) preparing electrolyte; (2) preparing and electrolyzing a steel sample: soaking the steel sample containing the inclusion into the electrolyte in an electrolytic cell; arranging a salt bath beside the electrolytic cell; erecting a salt bridge between the salt bath and the electrolytic cell; inserting a calomel electrode into the salt bath; inserting a calomel electrode in the salt bath; using the positive electrode of the steel sample, connected with a direct current stabilized power supply, as the anode, using a platinum wire as an electrolysis cathode, charging inert gas, particularly referring to argon; and (3) separating: pouring the electrolyte left after the electrolysis of the steel sample in the step (2) into a funnel which is filled with filter paper; arranging a vacuum filtration device which is loaded with a polytetrafluoroethylene membrane at the position tightly attached to the liquid down port of the funnel; separating the inclusion from the steel sample under the state that the vacuum filtration device is vacuumized; and transferring the polytetrafluoroethylene membrane which is distributed with the inclusion to a scanning electron microscope for detection. In the method provided by the invention, the inclusion can be extracted out of the steel without being damaged; and the three-dimensional shape of the inclusion is directly observed.

Electrochemical sensor capable of detecting trace mercury in water body, and preparation method and application thereof

The invention discloses an electrochemical sensor capable of detecting trace mercury in a water body. The electrochemical sensor comprises a gold electrode, wherein gold nanoclusters are deposited on the surface of the reaction end of the gold electrode; and sulfhydryl-modified mercury-specific oligonucleotide probes are self-assembled on the gold nanoclusters. The preparation method for the electrochemical sensor comprises the following steps of: first, preparing the gold electrode; then, electrodepositing the gold nanoclusters on the surface of the reaction end of the gold electrode; and finally, self-assembling the sulfhydryl-modified mercury-specific oligonucleotide probes on the end surfaces of the gold nanoclusters so as to finish the manufacturing of the sensor. By using the sensor provided by the invention, the trace mercury in the water body can be detected; and the specific operation comprises the following steps of: first, placing the reaction end of the sensor in a water sample for reacting; then, immersing the reaction end into an anion double-stranded deoxyribonucleic acid (DNA) signal embedded agent for complete treatment; later on, connecting the sensor into an electrolytic cell of a three-electrode system and measuring the change of a response peak current by using square wave voltammetry; and finally, judging whether the water sample contains mercury ions on the basis of the change. The electrochemical sensor has the advantages of simple and practical structure, convenience in manufacturing, high sensitivity, high selection specificity and the like.

Method for preparing phosphaalkene by utilizing electrochemistry

The invention discloses a method for preparing phosphaalkene by utilizing electrochemistry. The method comprises the following steps: firstly, assembling an electrolytic cell by using an inert electrode as a positive electrode and phosphorus as a negative electrode, wherein in the electrolytic cell, the electrolyte solution is one or several of an aqueous electrolyte solution, an organic electrolyte solution and an ionic liquid electrolyte solution containing the electrolyte; applying direct current or alternating current voltage between the two electrodes of the electrolytic cell and stripping the phosphorus into phosphaalkene under a function of a direct current electric field or an alternating current electric field; and performing filtration treatment to obtain a stripped product, washing the stripped product for a plurality of times by using an organic solvent, centrifugally separating and drying to obtain the required phosphaalkene. According to the method, a phosphaalkene material with good quality, high yield and low cost can be conveniently, quickly and securely produced in an environment-friendly form, and can be applied to multiple fields of secondary ion batteries, supercapacitors, solar batteries, fuel batteries, electro-catalysis, electronic elements, bioanalysis, biological sensors and the like.
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