9results about How to "Increase specific energy" patented technology

The application belongs to the technical field of sodium batteries, and discloses a negative electrode-free sodium battery current collector and a preparation method and application thereof. The current collector comprises a current collector substrate, and a sodium sulfide / carbon composite interface coating loaded on the surface of the current collector substrate; the sodium sulfide / carbon composite interface coating comprises a sulfur-doped carbon matrix and sodium sulfide dispersed in the sulfur-doped carbon matrix; and the sodium sulfide / carbon composite interface coating is obtained by high-temperature calcination of sodium sulfide and carbon material. Through high-temperature composite reaction of sodium sulfide and hard carbon, the composite interface coating with both a sulfur-doped carbon guide phase and a residual sodium sulfide sodium compensation phase is obtained, the synergistic optimization of sodium deposition uniformity, dendrite inhibition capacity and active sodium compensation is realized, and the specific energy and cycle life of the battery are improved.

This invention discloses a full-ocean-depth metal-seawater fuel cell. The metal anode material mainly comprises one or more of the following components: Mg, Sn, B, La, Ce, Pr, Nd, Dy, Sm, Ti, and Ca, with the balance being Al. The electrolyte of this invention is a mixed aqueous solution of natural seawater, sodium stannate, zinc oxide, zinc sulfate, sodium carbonate, and cerium chloride, with the pH adjusted to between 12 and 14. The metal anode of this invention, in the above electrolyte, not only significantly reduces the hydrogen evolution corrosion rate but also directionally induces product formation, thereby improving electrochemical performance. The preparation method of this metal anode and electrolyte is simple, applicable to different temperature and pressure variations and operating current densities, and can be applied to metal-seawater fuel cells under various operating conditions at full ocean depth.

The present application belongs to the technical field of lithium primary battery, and particularly relates to a preparation method of lithium primary battery electrolyte, which comprises the following steps: dissolving lithium nitrate in acetone and fully stirring to make the lithium nitrate fully dissolved until the solution is clear and transparent; adjusting the lithium salt concentration in the solution to 1.5-2 mol / L; adding fluoroethylene carbonate and fully stirring until the solution is clear and transparent; in the solution, the volume ratio of fluoroethylene carbonate to acetone is 1:1-1:3; finally, adding propylene carbonate and fully stirring until the solution is clear and transparent; in the solution, the volume ratio of propylene carbonate to acetone is 1:2-1:4. The present application ensures that the electrolyte has high conductivity and can bear high efficient transportation of lithium ions, effectively increasing the discharge specific capacity and specific energy of the battery. In addition, the present application further provides a lithium primary battery electrolyte.

A method for preparing a lightweight lithium metal anode and a secondary battery are provided. The method for preparing the lightweight lithium metal anode includes: vapor-depositing a copper layer on at least one surface of a polymer film to obtain a polymer-assisted film; freezing the polymer-assisted film in a freezing device; feeding a lithium metal / lithium alloy strip and the frozen polymer-assisted film into a step-by-step cold rolling mill with the lithium metal / lithium alloy facing the copper layer, wherein a primary lithium metal anode is obtained by pressure bonding through a first cooling roller in the step-by-step cold rolling mill, and a secondary lithium metal anode is obtained by pressure bonding through a second cooling roller. This process allows for the mass production of lightweight lithium metal anodes.

The application provides a combined power generation system and a power distribution method thereof, the method comprising: collecting a voltage feedback signal of a load power supply bus, obtaining current power available values of a first power supply device and a second power supply device; generating a total power demand pre-command and a total power demand command; taking a low-frequency power command as a first power supply device power demand pre-command, and calculating a second power supply device power demand pre-command; outputting the first power supply device power demand command and the second power supply device power demand command according to the current power available value of the second power supply device; outputting the first power supply device power demand command to the first power supply device and outputting the second power supply device power demand command to the second power supply device; and repeating the above steps until the load stops consuming power. The power distribution system and method can correspond to the transient load of the load, absorb the feedback charge of the load, and ensure the stability of the power generation system and the normal operation of each load.

The application discloses a kind of composite electrode and its preparation method and metal lithium battery.The composite electrode includes negative electrode, positive electrode and current collector, the current collector is located between positive electrode and negative electrode;The negative electrode includes metal lithium composite material layer, the metal lithium composite material layer includes granular double-skeleton lithium carbon composite material, the double-skeleton lithium carbon composite material has lithium boron particle as core, the core has lithium boron alloy structure skeleton and active lithium, three-dimensional porous carbon skeleton space layer formed by nano carbon material is arranged on the surface of the core, lithium boron alloy structure skeleton and carbon skeleton space layer formed by carbon material constitute double skeleton.The composite electrode has small volume change, long cycle life and can resist high temperature above 200 DEG C, is one of the candidate electrodes of power battery.

The invention relates to the field of storage batteries, in particular to an aluminum-based mixed material prefabricated punched grid and a storage battery prepared thereof.The aluminum-based mixed material prefabricated punched grid comprises an aluminum plate base body, a plurality of punched holes are prefabricated in the aluminum plate base body, and lead-tin alloy plating layers are arranged on the surfaces of the aluminum plate base body and the punched holes of the aluminum plate base body; the surface of the aluminum plate base body provided with the plating layer is provided with a concave-convex structure formed through crease concave-convex treatment, the thickness of the aluminum plate base body ranges from 0.4 mm to 1.5 mm, the thickness of the lead-tin alloy plating layer ranges from 5 micrometers to 10 micrometers, and in the lead-tin alloy, the mass percent of lead ranges from 50% to 60%, and the mass percent of tin ranges from 40% to 50%. According to the aluminum-based mixed material prefabricated punched plate grid and the storage battery prepared from the aluminum-based mixed material prefabricated punched plate grid, the mode that the lead-tin alloy is electroplated on the aluminum plate base body is adopted, the light weight and high conductivity of aluminum and the acid resistance of the lead alloy are achieved, and therefore the weight and cost of the storage battery are greatly reduced, the specific energy of the storage battery is improved, and the cycle life of the storage battery is prolonged.

This invention relates to a eutectic salt for thermal batteries, belonging to the field of electrochemical technology. The eutectic salt for thermal batteries of this invention comprises LiCl, LiBr, LiF, and BaCl2, with the following mass percentage contents: LiCl 11%–20%, LiBr 50%–70%, LiF 6%–12%, and BaCl2 16%–30%. This invention uses a LiCl-LiBr-LiF-BaCl2 eutectic salt with a melting point of 421.6℃. This is approximately 18.2℃ lower than the commonly used LiCl-LiBr-LiF eutectic salt (melting point 439.8℃). This invention has the following significant advantages: First, using the eutectic salt of this invention as an electrolyte in thermal batteries can extend the operating temperature range of the thermal battery, thus extending its thermal life and operational life. Second, the lower melting point reduces the amount of heating agent required, while simultaneously improving the specific energy and safety of the thermal battery. Third, this eutectic salt retains the high conductivity advantage of the LiCl-LiBr-LiF eutectic salt.

This invention provides a structural electrode, its fabrication method, and a structural battery based on a Kevlar fiber-reinforced current collector. The structural electrode includes a Kevlar fiber-reinforced current collector and an electrode material layer disposed on its surface. The Kevlar fiber-reinforced current collector is a modified Kevlar fiber layer modified with a conductive metal, obtained by modifying Kevlar fibers with trimethylchlorosilane. The Kevlar fiber-reinforced current collector in this invention has higher mechanical strength than traditional metal foil current collectors, thereby improving the mechanical strength of the structural electrode prepared using this current collector. The structural electrode of this invention can effectively alleviate volume expansion and stress accumulation, ensuring high specific energy of the battery while improving cycle stability. The structural battery of this invention adopts an integrated continuous packaging method. Through the mechanical coupling between the packaging shell and the structural electrode, the load is continuously transferred between the internal cell and the external packaging, improving the mechanical performance of the structural battery.