8results about How to "Lower nucleation overpotential" patented technology

This invention discloses a zinc thiocate modified copper current collector for electrodeless lithium metal batteries and its preparation method. Thioctic acid and zinc acetate are dissolved in solvents, and a composite solution is prepared by the coordination interaction between zinc ions and the carboxyl groups of thiocate. This composite solution is then spin-coated onto the surface of the copper current collector to form an ordered protective coating. This invention synergistically regulates the interface through the dual functions of zinc ions: firstly, zinc ions act as divalent coordination centers, cross-linking with thiocate molecules to construct a stable and regularly arranged protective coating; secondly, zinc ions act as lithiophilic nucleation sites, reducing the lithium nucleation overpotential, inducing uniform lithium ion deposition, and significantly inhibiting lithium dendrite growth. The modified current collector of this invention achieves a synergistic improvement in interface stability and electrochemical activity, enabling the battery to possess excellent cycle life and high safety, providing a novel interface design strategy for high-performance electrodeless lithium metal batteries.

The application relates to the technical field of battery materials, and discloses a sodium-philic carbon-based material, a negative-electrode-free current collector, a preparation method of the sodium-philic carbon-based material and a sodium metal battery. The preparation method of the sodium-philic carbon-based material comprises the following steps: providing a mixed solution, wherein the mixed solution comprises carbon source powder, an iron source and a solvent; fully reacting the mixed solution in a protective atmosphere at 160-240 DEG C; obtaining a carbon-loaded sodium-philic material after solid-liquid separation; fully calcining the carbon-loaded sodium-philic material in an inert atmosphere at 700-900 DEG C to obtain a porous sodium-philic precursor; and treating the porous sodium-philic precursor in a reaction gas atmosphere at 400-700 DEG C for 1-3 hours to obtain the sodium-philic carbon-based material. The reaction gas atmosphere is an ammonia gas and inert gas mixed atmosphere or an ammonia gas atmosphere. The material is coated on the surface of the negative-electrode-free sodium metal battery current collector, and can enhance the electrochemical performance of the battery.

The application relates to a preparation method and application of a porous material of porous lithium and its alloy. A foaming agent is fully mixed with metal lithium or a lithium alloy, the mixed lithium metal or lithium alloy is heated to a melt state through orderly temperature rising, a three-dimensional porous structure is generated in the melt through thermal decomposition and gas release of the foaming agent, and the porous material is obtained after the melt is cooled and solidified. The application can significantly inhibit the volume expansion of the negative electrode in the cycle process, reduce the nucleation overpotential of the metal lithium, and induce the uniform deposition of the metal lithium. Meanwhile, the substances generated in the decomposition process of the foaming agent can react with the metal lithium to form a protective layer around the pore wall, greatly inhibit the side reaction between the electrode and the electrolyte, accelerate the transmission of lithium ions, and realize the uniform and dense deposition of the metal lithium through the self-supporting structure, avoid the loss of the energy density of the electrode, reduce the manufacturing cost, inhibit the volume expansion of the lithium negative electrode, inhibit the dendrite growth, and improve the electrochemical performance of the lithium metal battery.

The application discloses a carbon-based lithium metal composite electrode co-modified by ferroelectric materials and single metal atoms and a preparation method and application thereof. The ferroelectric material is added into a spinning solution to be electrostatically spun into a film, metal ions are adsorbed through ion exchange after activation, and then the carbon-based lithium metal composite electrode is obtained through calcination reduction and finally electrochemical deposition of lithium. The ferroelectric material has a high dielectric constant, can reduce the generation of dendrites by adjusting the lithium ion flux, can promote the uniform distribution of metal atoms on the electrode material to compensate for the poor lithium affinity of the carbon skeleton itself, and can adsorb metal atoms on the surface of the carbon fiber instead of the inside by combining electrostatic spinning and ion exchange method, thereby significantly shortening the diffusion distance of lithium ions, reducing the nucleation overpotential, making the lithium ion diffusion and deposition uniform, effectively improving the lithium deposition uniformity of the carbon-based substrate as the negative electrode of the lithium metal battery, and improving the performance of the electrode.

The invention provides a current collector with a three-dimensional porous structure on the surface, a preparation method and a battery. The preparation method comprises the following steps: firstly, obtaining a tin / copper foil with a three-dimensional structure on the surface through constant-current electrodeposition tin; then coating an indium tin seed layer on the tin surface of the three-dimensional structure through co-electrodeposition of indium tin, and on the basis, continuously performing constant-current electrodeposition of indium to obtain indium / indium tin / tin / copper foil with a three-dimensional porous structure on the surface; and finally, enabling the indium / indium tin / tin / copper foil to form an alloy by adopting a heat treatment technology so as to obtain the current collector with a walnut-shaped three-dimensional porous structure on the surface. Therefore, the lithium nucleation overpotential can be reduced, and the uniform deposition of lithium is guided, so that the growth of lithium dendrites and the volume expansion of lithium metal are effectively inhibited.

This application provides a negative electrode current collector, comprising a substrate and a lithium alloy, wherein the lithium alloy is disposed on the surface of the substrate, the lithium alloy comprising lithium and a matrix material, wherein the atomic ratio of lithium in the lithium alloy is 30%-50%, and the plating weight of the lithium alloy is 2-3 g / m. 2 This application also provides a method for preparing the above-mentioned negative electrode current collector, a positive electrode sheet, a secondary battery, and an electrical device. The negative electrode current collector provided in this application is prepared by depositing the lithium alloy on the surface of the negative electrode current collector. In the lithium alloy, the atomic ratio of lithium is 30%-50%, and the plating weight of the lithium alloy is 2-3 g / m². 2 During the charging process of a secondary battery, lithium atoms can be oxidized into lithium ions and enter the electrolyte to replenish the lithium consumed by the formation of the solid electrolyte interphase (SEI) at the negative electrode of the lithium-ion battery. This helps to improve the quality of the SEI and thus improves the initial coulombic efficiency of the secondary battery.

This invention belongs to the field of new energy storage materials technology, specifically relating to a method for preparing and applying an ultrathin copper current collector modified with a carbon nanotube composite coating. Addressing the problems of strong lithium repellency, uneven metal deposition, and short cycle life of copper current collectors in electrodeless lithium-ion batteries, this invention constructs a composite functional layer on an ultrathin copper foil, composed of zinc-based oxide rich in oxygen vacancies and carbon nanotubes. In this coating, the zinc-based oxide acts as a highly lithium-affinity site, effectively reducing the metal nucleation overpotential; the carbon nanotube network provides a rapid electron conduction path and alleviates deposition stress. The preparation process is environmentally friendly, employing an aqueous slurry system and a simple heat treatment process. This modified current collector, used in electrodeless lithium-ion batteries, can guide uniform and dense metal deposition, significantly improving the battery's coulombic efficiency and cycle stability.

This invention discloses a functionalized negative electrode-free sodium-ion battery current collector and its preparation method, relating to the field of sodium-ion battery technology. The invention provides a functionalized negative electrode-free sodium-ion battery current collector, comprising the following structure: a substrate, a transition layer, and a modification layer; the transition layer is disposed between the substrate and the modification layer; the invention alleviates the volume expansion of the substrate and modification layer by depositing sodium-affinity antimony metal on the substrate surface to form the transition layer; by constructing the modification layer, sodium-affinity sites are enriched, reducing the sodium nucleation overpotential and improving the uniformity of sodium deposition; sodium-affinity porous carbon fibers are introduced to provide more nucleation sites and capacity space for sodium deposition, alleviating volume expansion stress; by introducing sodium-affinity bismuth metal, the energy barrier required for sodium nucleation is lowered, thereby guiding sodium metal to deposit more uniformly and densely on the current collector surface, effectively suppressing the disorderly growth of sodium dendrites, and synergistically improving the rate performance and cycle stability of the sodium-ion battery.