2 results about "Mn doping" patented technology

This invention discloses a highly wear-resistant and corrosion-resistant multi-principal element alloy and its preparation method, belonging to the field of metallic material preparation technology. It includes four main alloying elements (Al, Cr, Fe, and Ni) and a dopant element (Mn). The chemical composition of the multi-principal element alloy satisfies the general formula Al... a Cr b Fe c Ni d Mn e Where a is the atomic percentage of Al, b is the atomic percentage of Cr, c is the atomic percentage of Fe, d is the atomic percentage of Ni, and e is the atomic percentage of Mn, with the sum of the atomic percentages of each element being 100%. This invention regulates the phase, microstructure, and elemental distribution of the alloy through Mn doping, resulting in an alloy that possesses high hardness, excellent corrosion resistance, and corrosion wear resistance, as well as good plastic processing performance. The supporting preparation method is simple, with controllable parameters and readily available raw materials, making it suitable for large-scale industrial production. It can be widely used in key structural components of marine engineering equipment and other equipment operating under harsh corrosion-wear coupling conditions.

This invention discloses a metallically modulated Mn-doped spinel-type ZnCo₂O₄ anode material and its preparation method, belonging to the field of lithium-ion battery electrode materials. The material maintains a pure-phase spinel crystal structure, exhibiting uniform and regular 2–5 μm polyhedral micron-sized particles with layered wrinkles and stepped porous structures on the surface. Mn and Co exist in mixed valence states of Mn²⁺ / Mn³⁺ and Co²⁺ / Co³⁺. First-principles DFT calculations confirm that Mn doping transforms the material from a semiconductor to a metallic conductor, eliminating the band gap, significantly increasing the Fermi level electronic state density, and reducing the lithium-ion diffusion barrier from 1.05 eV to 0.75 eV. Its preparation employs a hydrothermal method combined with a calcination process. This material exhibits high reversible specific capacity at a current density of 0.1 A·g⁻¹, excellent capacity retention after 200 cycles, outstanding rate performance in the range of 0.1~1.0 A·g⁻¹, significantly reduced charge transfer resistance, and overall electrochemical performance far superior to pure-phase ZnCo₂O₄. It can be directly used as a negative electrode for lithium-ion batteries and has good application prospects in the field of lithium-ion batteries.