3results about How to "Improve first-time efficiency" patented technology

This invention discloses a mesoporous carbon composite material and its preparation method. The preparation method is as follows: S1: Using tetraethyl orthosilicate as the silicon source, an ethanol / deionized water mixture, a surfactant as the solvent system, and a conductive agent as the dopant, a polycondensation reaction is carried out under acid-base catalysis. A silica / soft template composite is formed through a sol-gel process, followed by high-temperature sintering to obtain a silica composite template; S2: A mixed solution A is prepared by mixing a phenol source, a dispersant, and water; a mixed solution B is prepared by mixing an aldehyde source, a lithium supplement, and a catalyst; S3: Mixed solutions A, B, and the silica composite template are reacted, carbonized, and activated. The resulting material is then added to a hydrofluoric acid solution to dissolve the template, and the resulting material undergoes thermal reduction to obtain the mesoporous carbon composite material. The mesoporous carbon prepared using the template method exhibits advantages such as high uniformity, large pore volume, and low powder resistivity. It can be applied to silicon-carbon composite materials to increase the deposition amount of nano-silicon, improve specific capacity, and reduce the expansion of silicon-carbon materials.

This invention relates to the field of battery technology, specifically to a composite anode material, its preparation method, and its applications. A composite anode material includes a carbon material matrix and a coating layer disposed on the surface of the carbon material matrix. The coating layer contains amorphous carbon and a dual-conductor composite. The dual-conductor composite has a core-shell structure, with the core layer containing a carbon-based conductive agent and the shell layer containing a fast-ion conductor. The composite anode material of this invention, through the synergy of the various layers, can further improve the fast-charging performance of the anode material and enhance the battery's capacity and cycle performance.

The high-nickel, low-cobalt cathode material provided in this application includes a cathode material substrate, a first coating layer, and a second coating layer. The first coating layer coats the surface of the cathode material substrate, and the second coating layer coats the surface of the first coating layer. The first coating layer comprises a material with the chemical formula Li. a Ni b Co c M 1‑b‑c O d The material comprises M, which includes one or both of Mn and Al, with 0.2 ≤ a ≤ 1, 0.88 < b ≤ 0.98, 0 ≤ c < 0.06, b + c < 1, and 1.6 ≤ d ≤ 2; the material of the second coating layer includes one or more of Li3PO4, Li2SO4, and LiPO3. The above-mentioned high-nickel, low-cobalt cathode material can prevent the electrolyte from corroding the cathode material matrix, protect the integrity of the bulk structure, and effectively inhibit the decomposition and collapse of the layered structure of the high-nickel, low-cobalt cathode material during charge-discharge cycles, thereby improving the long-cycle performance of the high-nickel, low-cobalt cathode material.