摘要:
A method and a device for detecting a gaseous anhydride and measuring its concentration in an oxygen-bearing gas. The method comprises the following steps: (a) forming an electrolytic junction by contact between a first solid-electrolyte element containing oxyanions of the anhydride to be detected and a second, 0.sup.-- ion-conducting solid-electrolyte element such as stabilized zirconia; (b) bringing this electrolytic junction into contact with the gas containing the gaseous anhydride to be detected so as to form a triple junction; (c) creating at this triple junction a difference of potential measurable by means of two reference electrodes in contact with the first and second electrolyte elements respectively, by fixation of a constant potential in the vicinity of each of these reference electrodes, which themselves are spatially removed from the triple junction; (d) heating the triple junction to such a temperature that a logarithmic variation in the concentration of the anhydride to be detected produces a proportional, substantially linear variation in the difference of potential at the triple junction, this temperature being lower than the melting temperatures of the first and second electrolyte elements; and (e) measuring this difference of potential by means of a potentiometer connected to the reference electrodes so as to obtain a measurement of the concentration of the anhydride to be detected. This method and device may advantageously be used for detecting sulfur carbon anhydrides.
摘要:
A guide is provided for the buckets of an endless dredging line comprising an emptying station incorporated into the guide. A system comprising a pair of trolleys and a pulley system is provided to hold each bucket stationary at the emptying station for dumping. The endless line travels over the pulleys, some of which are mounted on the trolleys. When a bucket approaches the emptying station, the trolleys are actuated to travel in opposite directions so as to allow the endless line to move at its normal speed while holding the bucket at the dumping station stationary.
摘要:
A process to induce polymerization of an organic electronically conductive polymer in the presence of a partially delithiated alkali metal phosphate which acts as the polymerization initiator.
摘要:
A process for preparing an at least partially lithiated transition metal oxyanion-based lithium−ion reversible electrode material, which includes providing a precursor of said lithium-ion reversible electrode material, heating said precursor, melting same at a temperature sufficient to produce a melt including an oxyanion containing liquid phase, cooling said melt under conditions to induce solidification thereof and obtain a solid electrode that is capable of reversible lithium ion deinsertion/insertion cycles for use in a lithium battery. Also, lithiated or partially lithiated oxyanion-based-lithium-ion reversible electrode materials obtained by the aforesaid process.
摘要:
An in-situ thermal management system for an energy storage device. The energy storage device includes a plurality of energy storage cells each being coupled in parallel to common positive and negative connections. Each of the energy storage cells, in accordance with the cell's technology, dimensions, and thermal/electrical properties, is configured to have a ratio of energy content-to-contact surface area such that thermal energy produced by a short-circuit in a particular cell is conducted to a cell adjacent the particular cell so as to prevent the temperature of the particular cell from exceeding a breakdown temperature. In one embodiment, a fuse is coupled in series with each of a number of energy storage cells. The fuses are activated by a current spike capacitively produced by a cell upon occurrence of a short-circuit in the cell, thereby electrically isolating the short-circuited cell from the common positive and negative connections.
摘要:
Rechargeable generator consisting of an anode of an alkali metal or a malleable alkali alloy, at least one polymer electrolyte which is conductive with respect to alkali cations and acts as separator, as well as at least one cathode which is reversible to cations of alkali metal and its current collector. The anode comprises a thin metallic sheet, which includes at the surface thereof a passivation film SEI capable of limiting reaction between the metal and the polymer electrolyte and to exchange lithium ions. The polymer electrolyte comprises a homogeneous separator which is capable of transmitting a pressure on the anode to resist against the dendridic strain of the metal of the anode by undergoing a rate of deformation lower than 35% of its thickness. The polymer electrolyte of the separator, contains a maximum amount of species which are reactive towards lithium and which can accumulate at the surface of the anode to permit a preservation of the quality of the ionic exchanges at the interface of the anode and electrolyte and finally, the combination of anode, electrolyte, cathode and collector is maintained under a mechanical strain which is sufficient to ensure that the separator confines the anode sheet in place to preserve the integrity of the lithium-electrolyte interface during consecutive cycles of dissolution/plating.
摘要:
Metallization by deposit under vacuum of metal on a face of a support film of synthetic resin at a thickness of 0.005 to 0.1 micron, followed by the electrochemical deposit of an additional metallic layer, whose thickness is between 0.1 and 4 microns. A coating of an electrode of a generator is then applied on the surface of the collector thus prepared. The assembly is characterized by the adhesion of its components and its facility of mechanized handling during the steps of assembling the complete generator.
摘要:
In order to assemble the components of an electrochemical generator using lithium, which are in the form of thin films and comprise a lithium- or lithium alloy-based negative electrode and a solid polymer electrolyte with conduction using the lithium ion, an intermediate assembly is used which consists of a thin film of lithium supported by a film of inert plastic with controlled adhesion to the lithium, as a precursor of the negative electrode. This intermediate assembly can be produced, inter alia, by rolling a sheet of lithium between two films of inert plastic.
摘要:
The disclosure describes a method for the preparation of metallic alloys containing an alkali or alkali-earth metal, such as lithium, and a host metal, such as aluminum. Initially, an active organic solution of the alkali or the alkali-earth metal is prepared, and a source of the alkali or alkali-earth metal which are both brought together with one another. On the other hand, a metallic structure containing the host metal is prepared, the metallic structure is brought together with the organic solution which is kept in touch with the source of metal until there is formed an alloy of the host metal and of the alkali or alkali-earth metal with the metallic structure, and the alloy possesses an activity which is determined by that of the organic solution. The organic solution then acts as transfer agent of the alkali or alkali-earth metal towards the host metallic structure. To prepare a negative electrode, the alloy is brought together with an electrolyte, such as a thin polymeric film. The disclosure also describes the electrodes as well as the electrochemical generators produced by using these electrodes. Considerably improved properties of cycling are obtained.
摘要:
The present invention relates to a kinetic wheel arrangement comprising a stator, a rotor and a magnetic suspension, wherein said rotor comprises a central recess about said axis of rotation; there is disposed in said central recess of the rotor a pressure system provided with a screw which is connected to the stator and of which the axis merges with said axis of rotation of the rotor, this pressure system being adapted to take a first position for which said rotor is free to rotate about its axis of rotation while being suspended by its magnetic suspension, and a second position for which it presses said rotor against said stator to immobilize it; and remotely-controlled means are provided to cut said screw between said stator and said rotor. The invention is particularly applicable to the caging of the rotor in phases during which the kinetic wheel arrangement undergoes considerable mechanical stresses.