14 results about "Specific energy density" patented technology

The invention relates to the technical field of energy storage batteries, in particular to a sulfimide lithium salt additive, an electrolyte and a lithium ion battery. The compound is characterized by having a structure as shown in a formula (I) or (II), wherein R1 is a halogen atom or a cyano group, and R2 is vinyl or ethynyl. In the first-time charging process of the sulfimide lithium salt, active lithium ions can be decomposed, active lithium consumed by a negative electrode SEI film and side reaction during first-time charging and discharging of the lithium ion battery is compensated, and the specific energy density and the cycle performance of the battery are improved.

The invention provides a quasi-solid-state negative-electrode-free sodium metal battery and a preparation method thereof, and belongs to the technical field of sodium metal batteries. Comprising a composite positive electrode, a quasi-solid electrolyte and a negative electrode current collector without an active substance, and the composite positive electrode provides a sodium source and comprises the active substance, a conductive carbon material and a binder; the quasi-solid electrolyte is polymer gel formed by a compound of an ether polymer, a sodium salt and a chain ether solvent. The specific energy density of the quasi-solid negative-electrode-free sodium metal battery exceeds 180 Wh kg <-1 >, use of flammable and volatile liquid electrolyte and metal sodium is avoided, safe production and stable circulation can be achieved, and the quasi-solid negative-electrode-free sodium metal battery shows more excellent comprehensive performance in the field of negative-electrode-free sodium batteries.

The present invention relates to a positive electrode active material and a lithium secondary battery comprising the same, and more particularly, to a positive electrode active material comprising lithium and a lithium-rich lithium manganese-based oxide having improved low energy density per unit volume and thus improved electrochemical characteristics, and a lithium secondary battery comprising the same.

The invention discloses a lithium ion battery negative electrode material as well as a preparation method and application thereof, relates to the technical field of new materials, and particularly relates to a preparation method of a lithium ion battery negative electrode material by taking a graphene nanobelt as a raw material, or mixing the graphene nanobelt with silicon, tin, boron, phosphorus or oxides thereof or lithiates thereof according to a certain mass ratio, and performing supercritical reaction, spheroidizing granulation and surface coating. And finally, the graphene nanobelt self-toughened, high-capacity and high-power negative electrode material is obtained. The production process is simple, low in production cost and suitable for large-scale production, the obtained negative electrode material has the advantages of being high in sphericity degree, controllable in particle size, high in tap density, high in mechanical strength and the like, and the problems that the negative electrode material is low in volumetric specific energy density, low in power density, unstable in circulation, violent in volume expansion and the like are fundamentally solved.

The application provides a silicon oxide composite material for a lithium ion battery negative electrode and a preparation method thereof, and comprises the following steps: (1) dissolving 1 part of a silicon source in 2-4 parts of anhydrous ethanol, adding 4-6 parts of deionized water, and then adding an acidic catalyst dropwise to obtain a first solution; dissolving an organic carbon source in anhydrous ethanol to obtain a second solution; wherein the organic carbon source is a mixture of sucrose, phenolic resin and epoxy resin with a mass ratio of 1:1.4-1.6:0.5-0.7; (2) preparing a gel; (3) preparing an aged gel, and drying under normal pressure to obtain a precursor product; (4) under a nitrogen protective atmosphere, heating the precursor product to 1100 DEG C and keeping the temperature for 3 hours, and then cooling the product to room temperature in the furnace to obtain the silicon oxide composite material for the lithium ion battery negative electrode. The silicon oxide composite material for the lithium ion battery negative electrode can improve the cycle stability and specific energy density of the battery.

This invention discloses a control method for laser-assisted winding of hydrogen cylinders. The method involves: collecting the temperature of the inner liner of the hydrogen cylinder using a temperature sensor and maintaining it within a preset range using heating or cooling devices; adjusting the braking device of the fiber unwinding device based on tension sensor data to stabilize fiber tension; obtaining the motor speed from the encoder and converting it into the fiber winding speed, which is then compared with a preset standard speed by the controller to adjust the motor drive voltage; controlling the laser emitting device to emit a laser beam of specific energy density, dynamically adjusting the emission direction and angle based on the rotation of the inner liner and the fiber position; monitoring the deformation of the inner liner using a displacement sensor, pausing and issuing an alarm if the deformation exceeds a threshold; and after winding is completed, using ultrasonic flaw detection, tensile testing, and appearance image analysis to inspect the quality of the hydrogen cylinder, reworking or marking any cylinders that do not meet standards, and recording all data for traceability and process optimization. This method effectively ensures the quality and performance of the hydrogen cylinders, meeting the needs of the hydrogen energy industry development.

The invention discloses a self-breathing type high-performance zinc air battery and a manufacturing method thereof, and the method comprises the following steps: preparing a La1-ySryMnO3-Mn3O4-porous carbon composite catalyst (y = 0.6-0.9) based on a one-pot method, and forming an extremely thin planar air electrode with the thickness of 0.35-0.55 mm by adopting a spraying method in combination with a cold pressing process; preparing the obtained planar air electrode into a cylindrical structure and then forming a flat-bottom U-shaped air positive electrode, putting a cylindrical diaphragm into the air positive electrode, injecting zinc negative electrode paste into the cylindrical diaphragm, and then inserting a negative electrode current collector with multiple layers of coaxial structures; the prepared air electrode is high in reaction activity and low in polarization potential; the cylindrical No.1 zinc air battery which is large in capacity (37Ah, working current 500mA), high in specific energy density (greater than 400W / kg) and capable of continuously and stably working under large current (2-5A) is developed by the method, and large-scale production of the high-performance LR20 type zinc air battery is facilitated.

The invention relates to a fuel cell and a fuel cell system for an aircraft. In order to improve the availability of hybrid-electric or all-electric aircraft, a fuel cell (10) is presented which has an increased efficiency and an increased, volume-specific or weight-specific energy density. The fuel cell (10) has a self-supporting membrane structure (12) which is designed as a triple periodic smooth surface, which gas-tightly separates a first cavity (14) to which fuel (40) is applied from a second cavity (16) to which oxidizing agent (42) is applied, whereas the two cavities (14, 16) are connected to one another in an ion-conducting manner.

The invention provides a full-closed deep sea subsurface buoy device based on a direct sodium borohydride fuel cell, which comprises a watertight pressure-resistant shell with a full-closed structure, and an internal closed cavity of the watertight pressure-resistant shell is divided into an instrument cabin, a fuel cell cabin, a liquid pump cabin and a fuel storage cabin. The instrument cabin is used for arranging detection instruments; a fuel cell and a lithium battery are arranged in the fuel cell cabin; the fuel cell and the lithium battery are electrically connected with the detection instrument, the fuel cell serves as a main power supply, and the lithium battery serves as a standby power supply to provide required power for the detection instrument. A negative electrode fuel storage bag and a positive electrode fuel storage bag are arranged in the fuel storage cabin and are used for accommodating fuel required by the fuel cell and waste liquid generated after the fuel reacts. According to the invention, the direct sodium borohydride fuel cell and the lithium battery are adopted as dual power supplies, and meanwhile, the advantage of high specific energy density of the direct sodium borohydride fuel cell is utilized, so that the cruising ability of the power supplies in a deep-sea low-temperature environment is improved, frequent battery replacement is avoided, and the long-term operation cost is reduced.

The present application discloses a negative electrode current collector, a negative electrode plate, and an electrochemical device. The negative electrode current collector includes an organic support layer and a copper-based conductive layer disposed on at least one surface of the organic support layer; wherein a thickness D1 of the copper-based conductive layer, a tensile strength T of the organic support layer, and a thickness D2 of the organic support layer satisfy a relational formula 0.01≤(300×D1) / (T×D2)≤0.5. The negative electrode current collector has relatively high mechanics and mechanical properties, good electrical conductivity and current collection performance, which can improve preparation yield of the negative electrode current collector, the negative electrode plate and the electrochemical device and their reliability during use, and is beneficial to enabling the electrochemical device to have relatively high electrochemical performance and relatively high gravimetric energy density.

The application provides a preparation method of an electrolyte additive, a high-voltage electrolyte containing the additive and a lithium battery, and belongs to the technical field of lithium batteries. The electrolyte additive is lithium aromatic carboxylate containing fluorine (cyano, fluorosulfonyl). The method is simple, efficient, low in raw material cost and suitable for large-scale preparation based on a simple acid-base neutralization reaction and filtration purification. The electrolyte additive prepared by the method and the electrolyte containing the additive can effectively improve the high-voltage stability of the lithium battery, significantly improve the cycle stability of the lithium battery at a high charging voltage of 4.5 V or above, and further improve the specific capacity and specific energy density of the lithium battery, so that the application prospect is very good, and the electrolyte additive can be expected to be used in the field of high-voltage electrolyte additives for lithium batteries.

The present technology relates to a lithium-ion battery (100) including a ribbon-shaped electrode-separator assembly (104) having an anode (120) / separator (118) / cathode (130) arrangement, where the anode (120) and cathode (130) each include a current collector (110, 115) having first and second longitudinal edges (110e, 115e), the current collectors each including a main region (122, 126) provided with a layer of respective electrode material (123, 125) and a free edge strip (121, 117) extending along the first longitudinal edge (110e, 115e) and not provided with electrode material. The assembly (104) is in the form of a winding having two terminal end faces and is enclosed by a housing. The anode (120) and cathode (130) are offset within the assembly (104) so ​​that a first longitudinal edge (110e) of the anode current collector projects from one of the terminal end faces, and a first longitudinal edge (115e) of the cathode current collector projects from the other of the terminal end faces. The battery (100) has metallic contact elements (101a, 102, 155) with which one of the first longitudinal edges (110e, 115e) is in direct contact and which are connected by welding. It is proposed that the separator (118) contains at least one inorganic material that improves its resistance to thermal stress.

The invention discloses a preparation method and application of a sodium ion battery positive electrode material. The method comprises the following steps: dissolving at least five metal element salts, a chelating agent and water to obtain a solution A; dissolving sodium ferrocyanide in deionized water to obtain a solution B; and slowly adding the solution A into the solution B at room temperature in an atmospheric environment, carrying out a co-precipitation reaction, and sequentially aging, centrifuging, washing and drying the obtained product to obtain the sodium-deficient prussian blue analogue containing crystal water, putting the sodium-deficient prussian blue analogue containing crystal water into an iodide solution for ultrasonic dispersion, and carrying out directional oxidation-reduction reaction; and after the reaction, sequentially centrifuging, washing and drying to obtain a high-entropy Prussian blue analogue which is rich in alkali metal ions and does not contain crystal water, namely the sodium ion battery positive electrode material. When the positive electrode material is applied to the sodium-ion battery, the positive electrode material is de-intercalated together in the circulation process, the working voltage of the sodium-ion battery is improved by 0.16 V, and the high specific energy density of the battery can be realized.

The invention relates to an alkali metal-sulfur cell and the use thereof. The alkali metal-sulfur secondary battery comprises or consists of: a positive electrode comprising or consisting of a sulfur source, a conductive carbon material, and an alkali metal ion conductive solid electrolyte; a negative electrode; and an organic electrolyte comprising or consisting of an organic ether and a conductive salt. The organic electrolyte is in contact with the positive electrode and the negative electrode, and is characterized in that the organic electrolyte has a solubility for sulfur-containing components of the positive electrode of < = 10 mmol sulfur atoms per liter of the organic electrolyte at a temperature of 20 DEG C to 100 DEG C. The alkali metal-sulfur secondary battery according to the present invention has a very high specific energy density and at the same time has a long service life. Actually, the specific energy density achieved by the alkali metal-sulfur secondary battery is remarkably higher than that of all previously known alkali metal-sulfur secondary batteries.