3results about How to "Improve Lithophilicity" patented technology

The application discloses a composite lithium-magnesium alloy negative electrode and a preparation and application thereof. After a fluorinated copolymer solution is uniformly loaded on the surface of a three-dimensional conductive framework, the three-dimensional conductive framework is combined with a lithium-magnesium alloy foil in a sandwich arrangement mode, and then the combination is obtained through mechanical rolling. The three-dimensional conductive framework material effectively reduces the size of the local current density, and can also provide sufficient accommodation space for the deposition of metal lithium. The elastic self-adaptive interface rich in LiF formed by using the fluorinated copolymer can accelerate the ion transmission at the interface and maintain the stability in a long cycle process. The lithium-magnesium alloy with the lithium affinity induces the uniform deposition of lithium ions, and the growth of dendrites is inhibited, so that the composite lithium-magnesium alloy negative electrode material with the fluorine-rich lithium elastic self-adaptive interface is constructed.

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.