9 results about "Lithium nitride" patented technology

This application relates to the field of electrolyte materials technology, and in particular to a method for preparing lithium selenide. The method includes: obtaining a precursor source, the precursor source including lithium nitride and a selenium source, and subjecting the precursor source to multiple calcination treatments to obtain lithium selenide. The present invention uses lithium nitride as a lithium source and a selenium source to undergo a redox reaction to generate lithium selenide and nitrogen gas. This method has a low cost, does not produce carbon impurities in the prepared product, and the prepared lithium selenide can be used directly as a high-purity raw material for solid electrolytes. In addition, the reaction between lithium nitride and selenium has low exothermic reaction, the reaction is easy to control, and the safety is higher, avoiding the problem of low safety caused by high exothermic reaction of elemental selenium and elemental lithium in the prior art.

This invention provides a lithium metal anode, its preparation method, and its application. The lithium metal anode includes a lithium metal matrix and an activation layer covering at least a portion of its surface; the lithium metal matrix includes lithium and silver; the activation layer includes lithium nitride and a first silver halide, wherein the first silver halide includes silver iodide. This invention provides an activation layer with specific chemical activity on the surface of a silver-containing lithium metal anode. Silver iodide can form lithium transport channels, activating dead lithium and improving the battery's cycle performance. Simultaneously, Li3N is a good SEI component, which can inhibit dendrite growth, isolate the electrolyte from contact with the anode, reduce active lithium loss, and further improve battery cycle performance. Furthermore, halogens existing in the form of silver halides are resistant to high voltage and not easily oxidized; therefore, high-voltage cathode materials with higher energy density can be selected to achieve a significant improvement in the cycle performance of high-energy-density lithium metal batteries.

Provided is a method of manufacturing lithium nitride including: a step (A) of preparing a lithium member in which inorganic particles are embedded; and a step (B) of nitriding the lithium member by bringing the lithium member into contact with nitrogen in a state where the inorganic particles are embedded.

The application discloses a kind of composite lithium metal negative electrode material and preparation method thereof, it is related to electrochemical energy storage technical field, the method comprises: the three-dimensional porous carbon framework of pore size 50 to 500 nanometers is constructed, and 2 to 10 nanometer nitrogen-doped carbon layer is coated on its inner wall;Metal lithium is fused with lithium nitride to form lithium-rich melt;Capillary force is used to make molten lithium infiltrate into framework channel, in-situ generation and C-Li-N gradient interface phase;Lithium directional solidification is realized by programmed temperature cooling;Surface deposition 50 to 150 nanometer amorphous aluminum oxide passivation layer;Again, the final material is obtained by aging treatment.The application realizes lithium uniform loading, interface high ionic conductivity, structural integrity and high safety by the above technical scheme, significantly inhibits lithium dendrite growth, improves cycle stability and energy density consistency.

This invention relates to a method for preparing a negative electrode, the negative electrode itself, and a solid-liquid hybrid battery containing the negative electrode. The method for preparing the negative electrode includes the following steps: pressing a lithium sheet onto a copper foil; sequentially subjecting the surface of the metallic lithium to multi-stage, segmented nitrogen treatment, with each stage involving an increasing temperature and a treatment time of 30 to 90 minutes; and cooling and allowing it to stand after each stage of treatment to form a multi-layered gradient lithium nitride protective layer. Through this preparation method, a gradient lithium nitride protective layer with progressively increasing density and elasticity from the inside out can be formed on the surface of the negative electrode. This structure significantly reduces stress concentration and mismatch risk, suppresses microcracks and interface cracking, reduces the rate of increase in interfacial impedance, and improves long-term cycle stability and safety.

This invention discloses a nano-cubic boron nitride material and its synthesis method, belonging to the technical field of cubic boron nitride materials. First, hexagonal boron nitride is modified by hydroxylation to obtain hydroxyl-rich hexagonal boron nitride. Aluminum hydroxide is grown in situ on the surface of the hydroxyl-rich hexagonal boron nitride using aluminum nitrate hexahydrate as the aluminum source. After high-temperature nitrogen calcination, alumina-supported hexagonal boron nitride is obtained. Then, a nitriding reaction occurs under a high-temperature ammonia atmosphere to obtain aluminum-supported hexagonal boron nitride. The modified hexagonal boron nitride is mixed with lithium magnesium nitride and molded, then subjected to a catalytic phase transition reaction under high temperature and pressure. Finally, it is refined through a gradient purification process to obtain the nano-cubic boron nitride material. By hydroxylating the matrix and constructing the nano-aluminum nitride active phase in situ, the compatibility between the catalyst and the matrix interface is optimized, and microscopic defects at grain boundaries are reduced, giving the material excellent thermal and structural stability, meeting the long-term stable service requirements of precision grinding applications.

The application belongs to the technical field of lithium ion battery materials, and particularly relates to a high-nickel single-crystal ternary positive electrode modified material and a preparation method thereof. The method comprises the following steps: after high-nickel single-crystal ternary precursors, lithium hydroxide monohydrate and cerium-tantalum co-doped lithium molybdenum oxyfluoride compounds are ball milled, pre-sintering and high-temperature calcination are performed under an oxygen atmosphere, and single-crystal particle powder is obtained by crushing; then the single-crystal particle powder is mixed with calcium-doped lithium boron phosphorus oxynitride compounds, dried, and then heat treated under a nitrogen atmosphere and sieved. The cerium-tantalum co-doped lithium molybdenum oxyfluoride compounds are prepared by ball milling, drying and step-by-step sintering in a protective powder from lithium carbonate, cerium oxide, tantalum oxide, molybdenum oxide and lithium fluoride; the calcium-doped lithium boron phosphorus oxynitride compounds are prepared by ball milling, step-by-step sintering from lithium carbonate, calcium carbonate, boric acid and ammonium dihydrogen phosphate, and then ball milling and sintering with lithium nitride under nitrogen protection. The application significantly improves the structural stability and electrochemical performance of the high-nickel single-crystal ternary positive electrode material.

This invention belongs to the field of lithium-ion battery material technology, specifically relating to a high-nickel single-crystal ternary cathode modified material and its preparation method. The method includes: ball milling a high-nickel single-crystal ternary precursor, lithium hydroxide monohydrate, and a cerium-tantalum co-doped lithium molybdenum oxyfluoride compound, followed by pre-sintering and high-temperature calcination under an oxygen atmosphere to obtain single-crystal powder particles; then mixing the single-crystal powder particles with a calcium-doped lithium boron phosphorus oxynitride compound, drying, and holding under a nitrogen atmosphere before sieving. The cerium-tantalum co-doped lithium molybdenum oxyfluoride compound is prepared by ball milling, drying, and segmented sintering of lithium carbonate, cerium oxide, tantalum oxide, molybdenum oxide, and lithium fluoride in a protective powder; the calcium-doped lithium boron phosphorus oxynitride compound is prepared by ball milling, segmented sintering, and ball milling and sintering with lithium nitride under nitrogen protection. This invention significantly improves the structural stability and electrochemical performance of the high-nickel single-crystal ternary cathode material.