Abstract: The present invention provides a layered lithium-rich manganese-based cathode material with olivine structured LiMPO4 surface modification and a preparation method thereof. The preparation method comprises: firstly, preparing a pure-phase layered lithium-rich manganese-based cathode material by using a coprecipitation method and a high temperature sintering method, and then uniformly coating and doping olivine-structured LiMPO4 to the surface of the layered lithium-manganese-rich composite cathode material by using a sol-gel method. According to the present invention, the surface of the layered lithium-rich manganese-based cathode material is modified by olivine structured LiMPO4, such that cycle stability thereof is effectively improved, and voltage drop generated by the material in the cycle course is inhibited. The preparation method according to the present invention is simple, low cost, environmentally friendly, and is suitable for large-scale industrial production.

Abstract: Disclosed are a lithium anode surface modification method for a lithium metal battery and a lithium metal battery. The modification method comprises the following steps: immersing, in a dry protective gas atmosphere, a lithium metal anode in a fluorine ion-containing liquid, or dropping a fluorine ion-containing liquid on a surface of the lithium metal anode; after fluorination and removal, a protective layer rich in lithium fluoride is formed on the surface of the lithium metal anode, and a lithium metal-coated lithium metal anode is obtained.

Abstract: The present invention provides a layered lithium-rich manganese-based cathode material with olivine structured LiMPO4 surface modification and a preparation method thereof. The preparation method comprises: firstly, preparing a pure-phase layered lithium-rich manganese-based cathode material by using a coprecipitation method and a high temperature sintering method, and then uniformly coating and doping olivine-structured LiMPO4 to the surface of the layered lithium-manganese-rich composite cathode material by using a sol-gel method. According to the present invention, the surface of the layered lithium-rich manganese-based cathode material is modified by olivine structured LiMPO4, such that cycle stability thereof is effectively improved, and voltage drop generated by the material in the cycle course is inhibited. The preparation method according to the present invention is simple, low cost, environmentally friendly, and is suitable for large-scale industrial production.

Abstract: The present invention provides a three-dimensional structured plant-fiber carbon material for use as an anode material for a sodium-ion battery and a lithium-ion battery, and a preparation method thereof. The preparation method of the three-dimensional structured plant-fiber carbon material comprises: soaking the plant fiber into a pore forming agent, a nitrate solution, wetting the fiber at a constant temperature, after drying, calcining and grinding the fiber at a protective atmosphere, washing the resulted material with hydrochloric acid and deionized water and drying the material. The three-dimensional structured plant-fiber carbon material has a three-dimensional porous thin sheet-like and long tunnel structure, wherein the thin sheet has a thickness of 5 to 30 nm.