14 results about "Lithium peroxide" patented technology

The present invention discloses a graphite composite material, a preparation method thereof, and a lithium-ion battery, relating to the technical field of battery material preparation. The preparation method of the graphite composite material comprises: obtaining amidated graphite, mixing the amidated graphite, lithium peroxide, hydrogen peroxide solution, and an organic acid reagent, and performing a cross-linking reaction to obtain an intermediate; mixing the intermediate with a curing agent and asphalt, and sequentially performing a curing reaction and a carbonization reaction to obtain the graphite composite material. The lithium peroxide and hydrogen peroxide solution, two oxidants, oxidatively cross-link the amidated graphite under acidic conditions, dissociating lithium ions from the lithium peroxide and entering the interlayer spaces of the graphite; the intermediate and the curing agent further cross-link to form a more complex three-dimensional network structure; and the carbonization process coats the graphite surface with soft carbon, thereby improving the stability, initial efficiency, fast-charging performance, and high-temperature performance of the graphite material.

Nanoporous carbon-based scaffolds or structures, and specifically carbon aerogels and their manufacture and use thereof. Embodiments include a cathode material within a lithium-air battery, where the cathode is formed of a binder-free, monolithic, polyimide-derived carbon aerogel. The carbon aerogel includes pores that improve the oxygen transport properties of electrolyte solution and improve the formation of lithium peroxide along the surface and / or within the pores of the carbon aerogel. The cathode and underlying carbon aerogel provide optimal properties for use within the lithium-air battery.

The present invention discloses a method for removing residual alkali and coating a high-nickel ternary cathode material and its application. The sintered and crushed high-nickel ternary cathode material is placed in a reaction device, ozone is introduced and heated for reaction, an inert gas is then introduced to expel the ozone, titanium tetrachloride gas is introduced under heating conditions for reaction, and oxygen is introduced and heated for reaction to obtain a coated high-nickel ternary cathode material. The present invention utilizes the strong oxidizing property of ozone to oxidize residual lithium into lithium peroxide, which is subsequently reacted with titanium tetrachloride to form lithium titanate to neutralize the residual lithium on the surface. The titanium tetrachloride and oxygen are then subjected to a vapor deposition reaction to obtain a titanium dioxide coating layer.

The invention discloses a preparation method of low-cost high-purity lithium oxide. The method comprises the following steps: sequentially adding pure water and lithium hydroxide into a reaction kettle to prepare a reaction kettle base solution, then adding a hydrogen peroxide solution, carrying out peroxidation reaction, and strictly controlling the raw material adding sequence, the solid content of the reaction kettle base solution, the excess ratio of hydrogen peroxide, the flow rate of hydrogen peroxide, the reaction temperature and the reaction time; the method comprises the following steps: reacting hydrogen peroxide with lithium peroxide to obtain a solid-liquid mixture containing lithium peroxide, water and excessive unreacted hydrogen peroxide, carrying out dynamic vacuum drying on the solid-liquid mixture to obtain lithium peroxide, pyrolyzing the lithium peroxide, and finally grinding and screening the pyrolyzed product to obtain the high-purity lithium oxide. According to the method, conventional lithium hydroxide and commercially available hydrogen peroxide are adopted as raw materials, the raw material lithium hydroxide is completely reacted by strictly controlling the synthesis conditions of the intermediate product lithium peroxide, the high-purity lithium oxide can be obtained without solid-liquid separation, direct drying, pyrolysis, grinding and screening, and the method has the advantages of low cost, high production efficiency and high purity of the product lithium oxide.

The mixed metal oxide composition is calcined to form the cathode material. The mixed metal oxide composition is a mixed metal oxide composition formed by mixing (i) a metal-containing precursor and (ii) a lithium precursor, the lithium precursor comprising lithium peroxide (Li2O2), lithium hydroperoxide (LiOOH), lithium peroxide monoperoxide hydrate trihydrate (Li2O2.H2O2. 3H2O), or a mixture of any two or more of the foregoing. The cathode material formed comprises a compound of formula (II): qLi2MnO3. (1-q) LiNiaMnbCocMyO2 + z (II), where 0 < = q < = 0.8, c = 1-a-b, 0 < = a < = 1, 0 lt; b < = 1, 0 < = y < = 0.05,-0.025 < = z < = 0.125, and M is selected from the group consisting of Al, Mg, Ti, Mo, Nb, Zr, Hf, Ta, W, B, P, F, and a combination of any two or more of the foregoing.

The present invention belongs to the technical field of metal-air batteries, and provides a light-assisted lithium-air battery photoelectric positive electrode, a preparation method thereof, and a light-assisted lithium-air battery. The present invention adopts nickel-doped α-ferric oxide nanospheres, conductive carbon black, and a binder to prepare a porous coating and applies it to a conductive current collector. Under light conditions, nickel-doped α-ferric oxide nanospheres are used to absorb light energy to achieve the separation of photogenerated electrons and holes. During the charging reaction, the photogenerated electrons can be transmitted to the lithium negative electrode through an external circuit and combined with lithium ions for deposition. At the same time, the photogenerated holes oxidize lithium peroxide to promote its decomposition into oxygen, reduce the battery charging overpotential, and alleviate the occurrence of side reactions, thereby improving the charge and discharge efficiency and cycle stability of the lithium-air battery. The results of the embodiment show that the lithium-air battery assembled with the light-assisted lithium-air battery photoelectric positive electrode provided by the present invention has a first cycle overpotential of 0.73V under light conditions.

A non-aqueous electrolyte secondary battery according to one embodiment of the present disclosure comprises: an outer can that is cylindrical in shape, has a bottom part at one end, and has an opening at the other end; an electrode body and a non-aqueous electrolyte that are accommodated in a barrel part of the outer can; and a sealing body that closes the opening via a gasket. A groove part in which the diameter of the outer can is smaller than that of the barrel part is formed between the opening and the barrel part. A functional layer containing one or more compounds selected from the group consisting of lithium hydroxide, lithium peroxide, and copper oxide is disposed in at least a portion of a region composed of the groove part and the opening on the inner surface of the outer can.

The present application relates to lithium material preparation technical field, provide a kind of preparation method of high-purity lithium oxide, comprising the following steps: after heating lithium hydroxide solution, slowly drop the mixed solution of low concentration hydrogen peroxide and dehydrating agent, after reaction centrifugation, obtain peroxide and mother liquor;Under low temperature conditions, peroxide is washed several times with detergent, obtain slurry and filtrate, slurry is obtained after magnetic removal Pure crystalline water peroxide;Under low temperature conditions, the obtained crystalline water peroxide is concentrated under reduced pressure, then vacuum drying is removed crystalline water, obtain dry product peroxide;Then pyrolysis is carried out under vacuum condition, inert gas is continuously introduced during pyrolysis process, obtain high-purity lithium oxide;The present application uses lithium hydroxide solution as lithium source, after treatment by adding low concentration hydrogen peroxide, high-purity lithium oxide can be prepared, so that the obtained lithium hydroxide solution of enterprise production line is effectively utilized, and resource waste and environmental pollution are not caused.

Provided are methods of making a lithium peroxide-coated transition metal precursor comprising: mixing lithium hydroxide and hydrogen peroxide to form a suspension; adding a precipitant to the suspension to accelerate precipitation of lithium peroxide; and adding a transition metal precursor into the suspension to form a lithium peroxide-coated transition metal precursor.

The invention relates to a method for producing an over-lithiated transition metal oxide, for example Li2NiO2, from a mixture of lithium peroxide and at least one transition metal oxide or manganese-containing spinel compound in a two-stage calcination process involving temperature and atmosphere composition.

The invention relates to a lithium-oxygen battery electrolyte for regulating and controlling a solvation structure as well as a preparation method and application of the lithium-oxygen battery electrolyte, and belongs to the technical field of lithium-oxygen batteries. The problem that an existing electrolyte cannot give consideration to positive electrode reaction kinetics and negative electrode stability is solved. The electrolyte comprises a lithium salt, an organic solvent and a functional additive, and is characterized in that the functional additive is an indole compound or a derivative thereof, and the concentration is 20 mM to 150 mM. The additive can be coordinated with lithium ions to form a unique [additive... Li < + >] solvated structure, a lithium ion desolvating energy barrier is reduced at a negative electrode, lithium dendrite growth is inhibited, a stable SEI film is formed, and lithium peroxide is guided to grow into annular granular lithium peroxide through a solution mediation way at a positive electrode. The positive and negative electrode interface reaction is synergistically optimized through the single additive, the charge and discharge overpotential is reduced, the discharge capacity and energy efficiency of the battery are improved, the cycle life is prolonged, the additive raw materials are easy to obtain, and the preparation method is simple.

The application belongs to the technical field of batteries, and provides a high-nickel ternary positive electrode material, a preparation method and application thereof.The high-nickel ternary positive electrode material comprises a high-nickel main material and a coating layer arranged on the surface of the high-nickel main material, and the coating layer comprises lithium peroxide.The lithium peroxide coating can play a protective and isolating role of the coating layer, improve the cycle performance, and produce a lithium supplement effect without causing capacity damage to the high-nickel main material.The preparation method introduces peroxide during high-temperature calcination to form the high-nickel main material, effectively reduces the mixing degree of lithium and nickel in the high-nickel and super-high-nickel ternary main material, washes the obtained high-nickel main material in a lithium-containing aqueous solution, realizes lithium hydroxide coating while washing away lithium carbonate, suppresses the damage of water to the main material, and generates a rock salt phase protective layer on the surface of the main material, further enhancing the cycle stability of the material.

The present application relates to a kind of surface modified lithium-rich positive electrode material, positive electrode sheet and its preparation method and application.The surface modified lithium-rich positive electrode material includes: lithium-rich positive electrode material matrix, lithium salt coating layer generated by in-situ reaction and spinel structure transition layer;Spinel structure transition layer is between lithium-rich positive electrode material matrix and lithium salt coating layer;Lithium salt coating layer is generated by in-situ reaction of aluminum salt and lithium raw material;Wherein, lithium raw material includes lithium oxide and / or material that can generate lithium oxide by thermal decomposition, and the lithium salt coating layer is generated by in-situ reaction of lithium oxide and aluminum salt;Spinel structure transition layer and the lattice of lithium salt coating layer on the surface of lithium-rich manganese-based positive electrode material matrix contain Al element with concentration gradient distribution, and form Al-O bond by combining with O element.The present application makes lithium-rich positive electrode material not only have excellent lattice oxygen stability at high voltage by surface modification, also show good lithium ion diffusion capacity and electrochemical performance.

The invention discloses a pre-lithiation-free lithium-metal-free lithium-oxygen battery with a closed structure and a preparation method thereof, and the method comprises the following steps: sealing a first positive electrode containing a lithium peroxide-loaded carbon material conductive skeleton, an aluminum foil negative electrode, a diaphragm and an electrolyte in a shell, and charging to obtain the battery. The first positive electrode directly takes a carbon skeleton loaded with lithium peroxide as a material, lithium peroxide reacts to generate lithium oxide and release lithium ions during charging, initial lithiation of the negative electrode is realized, a pre-lithiation function is integrated on the positive electrode, and dependence on a lithium metal negative electrode is eliminated. The aluminum foil negative electrode is stable in chemical property and does not need special pretreatment. The battery is sealed and assembled at one time without step-by-step operation in an inert atmosphere; and an open structure similar to an air battery does not need to be designed, so that electrolyte volatilization and side reaction are avoided. And charging not only activates the battery, but also realizes pre-lithiation of the negative electrode, so that disassembly and recombination are avoided. According to the method, through material innovation and process simplification, traditional steps are integrated, high-risk links are eliminated, and the preparation efficiency and the battery consistency are improved.