摘要:
In order to provide an inexpensive product composed of a porous carbon provided with electrochemical active material, said product being suitable particularly for use as a cathode or anode material for a secondary battery, a process comprising the following process steps is proposed: (a) producing a template from inorganic material by gas phase deposition, said template comprising a framework of pores and nanoparticles joined to one another, (b) coating the template framework with an electrochemical active material or a precursor thereof, (c) infiltrating the pores of the template with a precursor substance for carbon, (d) carbonizing the precursor substance to form a carbon layer, (f) removing the template.
摘要:
The present invention relates to a process for the production of alpha-hydroxycarboxylic esters by means of alcoholysis of the corresponding alpha-hydroxycarboxamide under heterogeneous catalysis.
摘要:
A known method for producing a porous carbon body comprises providing a template of inorganic template material which comprises interconnected pores, providing a precursor substance for carbon, infiltrating the pores of the template with the precursor substance, carbonizing the precursor substance and removing the template with formation of the porous carbon product. Starting therefrom, to provide a method which allows a cost-effective production of a porous carbon structure also with thick wall thicknesses, it is suggested according to the invention that precursor substance particles of fusible material and template particles are provided and a powder mixture is formed from the particles, and that the powder mixture is heated before or during carbonization according to method step (d) in such a manner that precursor substance melt penetrates into the pores of the template particles.
摘要:
The invention relates to a device for actuating actuators in a motor vehicle having an at least partially metallic housing (MG) in which an electric circuit is arranged, which has at least one high-voltage-generating circuit (HES) for generating an output voltage (UHS) which is higher than a voltage which is considered safe for people, from the on-board motor vehicle power system voltage. The electric circuit has a monitoring circuit (UES) which has a first input (E1) which is connected to a reference voltage (Vref), and has a second input (E2) which is connected to the at least partially metallic housing (MG), and the output (A) of which is operatively connected to the high-voltage-generating circuit (HSS) in such a way that in the case of a differential voltage at the two inputs (E1, E2) which is higher than a predefined value, the high-voltage-generating circuit (HSS) is deactivated or the output voltage (UHS) thereof is limited to a value of at maximum the voltage which is considered safe for people.
摘要:
In a known method for the cleaning of SiO2 grain, a fill of particles in a reactor having a vertically oriented center axis will be heated and simultaneously exposed to a treatment gas which is passed at a specified flow velocity from the bottom to the top through the reactor and the fill. To provide on this basis an improved cleaning method and a suitable simple device for it, it is proposed according to the invention and with regard to the cleaning method that a chloric treatment gas will be used which is set to a treatment temperature of at least 1,000° C. in the area of the fill, and that the flow velocity is set to at least 10 cm/s. With regard to the device according to the invention for the implementation of the method according to the invention, a gas shower is provided for the gas inlet, the gas shower comprising below the fill a multitude of nozzle openings distributed laterally to the center axis, for introduction of the treatment gas into the fill. The SiO2 grain of naturally occurring raw material and cleaned according to the invention is characterized by an iron content of less than 20 ppb by weight, preferably less than 5 ppb; a manganese content of less than 30 ppb by weight, preferably 5 ppb; a lithium content of less than 50 ppb, preferably 5 ppb; as well as chromium, copper and nickel each with less than 20 ppb by weight, preferably 1 ppb.
摘要:
The invention relates to a device for actuating actuators in a motor vehicle having an at least partially metallic housing (MG) in which an electric circuit is arranged, which has at least one high-voltage-generating circuit (HES) for generating an output voltage (UHS) which is higher than a voltage which is considered safe for people, from the on-board motor vehicle power system voltage. The electric circuit has a monitoring circuit (UES) which has a first input (E1) which is connected to a reference voltage (Vref), and has a second input (E2) which is connected to the at least partially metallic housing (MG), and the output (A) of which is operatively connected to the high-voltage-generating circuit (HSS) in such a way that in the case of a differential voltage at the two inputs (E1, E2) which is higher than a predefined value, the high-voltage-generating circuit (HSS) is deactivated or the output voltage (UHS) thereof is limited to a value of at maximum the voltage which is considered safe for people.
摘要:
Inexpensive product consisting of porous carbon, with a pore structure which is suitable for retaining electrode parts which can be used in particular for a use as an electrode material for a lithium-sulphur secondary battery, and a method comprising the following method steps: (a) providing a template consisting of inorganic material which contains spherical nanoparticles and pores, (b) infiltrating the pores of the template with a precursor for carbon of a first variety, (c) carbonizing so as to form an inner layer on the nanoparticles with a first microporosity, (d) infiltrating the remaining pores of the template with a precursor substance for carbon of a second variety, (e) carbonizing the precursor substance, wherein an outer layer with a second microporosity which is lower than the first microporosity is produced on the inner layer, and (f) removing the template so as to form the carbon product with layer composite structure, comprising an inner layer consisting carbon with a first, relatively high microporosity, which has a free surface facing a cavity, and an outer layer consisting of carbon with a second, relatively low microporosity, which has a free surface facing away from the cavity.
摘要:
Build-up granulation and compaction granulation methods are generally known for producing granules from porous inorganic material. In order to allow a cost-efficient yet also reproducible production of porous granules having a more pronounced hierarchical pore structure, the invention relates to a method comprising the following steps: (a) supplying a feedstock flow to a reaction zone in which the feedstock is converted to material particles by means of pyrolysis or hydrolysis, (b) depositing the material particles on a deposition surface (1a) forming a soot layer (5), (c) thermally hardening the soot layer (5) to form a porous soot plate (5a), and (d) comminuting the soot plate (5a) to form porous granules (13).
摘要:
For use as electrode material for a lithium battery, porous templates are impregnated with a carbon feedstock that can be graphitized. This frequently results in only a low thickness of the deposited, graphite-like layer, such that generally several such infiltration and carbonation processes must be carried out consecutively. In order to provide a cost-effective product which is made of porous carbon and has high porosity and a low surface, according to the invention a method comprises the following method steps: (a) preparing a porous carbon structure having a large specific surface, (b) infiltrating the carbon structure with a precursor substance for carbon that can be graphitized, (c) carbonizing the precursor substance to form the carbon product having a low specific surface, wherein preparing the carbon structure according to method step (a) comprises the following: (I) preparing a template containing pores, (II) infiltrating the pores of the template with a solution that contains a precursor of carbon that cannot be graphitized, (III) carbonizing the precursor forming the carbon structure having the first specific surface, and (IV) removing the template.
摘要:
The present invention describes a process for preparing alpha-beta-unsaturated carboxylic acids by dehydration of hydroxycarboxylic or alkoxycarboxylic acids which are substituted in the alpha position, in particular 2-hydroxyisobutyric acid, while avoiding accumulation of by-products and additives.