4results 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.

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.

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.