15results about How to "Increased Diffusion Channel" patented technology

The invention belongs to the technical field of lithium ion batteries, provides a high-entropy high-nickel single crystal lithium ion battery positive electrode material and a preparation method thereof, and aims to solve many problems of a high-nickel nickel cobalt lithium manganate positive electrode material and improve the comprehensive performance of the high-nickel nickel cobalt lithium manganate positive electrode material. Aiming at the modification requirement of the high-nickel layered nickel cobalt lithium manganate ternary system positive electrode material, a high-entropy alloy doping strategy is provided on the basis of a combination design and a component proportion design, and meanwhile, the strict design of a preparation process is combined on the basis of high-entropy alloy doping, so that the positive electrode material after high-entropy doping presents a single-crystal morphology, and the high-entropy doping performance of the positive electrode material is improved. The specific molecular expression is Li < 1 + delta > [Ni < 0.86 + / -x > Co < 0.04 + / -x / 2 > Mn < 0.1 + / -x / 2 > (OH) < 2 >] < 1-z > MzO2, delta is greater than or equal to 0 and less than or equal to 0.2, x is greater than or equal to 0 and less than or equal to 0.06, and z is greater than or equal to 0.005 and less than or equal to 0.25; m is at least five of Al, Mg, Ti, Zr, Ga, In, Y, La, B, Si and Nb. In conclusion, the high-entropy and high-nickel positive electrode material with the single crystal morphology is synthesized by adopting a high-temperature solid-phase method, and the positive electrode material shows good electrochemical performance and can show relatively good specific discharge capacity and cycling stability under the high voltage of 2.8-4.5 V.

The invention provides a modified lithium manganese iron phosphate positive electrode material and a preparation method thereof, a positive electrode and a battery, the modified lithium manganese iron phosphate positive electrode material comprises an inner core and a coating layer located on the surface of the inner core, the chemical formula of the inner core comprises LixMnyFe1-yDzP1-zO4 (Ph), D is selected from Se and / or Te, 1 < = x < = 1.05, 0.2 < = y < = 0.8, 0.01 < = z < = 0.055, 1.001 lt; 1-z + h < = 1.055; the preparation method comprises the following steps: mixing a carbon source, a lithium source, an iron source, a manganese source, a D source and a phosphorus source according to a molar ratio of a molecular formula A, grinding and drying to obtain a precursor; performing first sintering on the precursor to obtain a first sample; and mixing and supplementing a phosphorus source, a carbon source and the first sample, and sequentially grinding and secondarily sintering to obtain the modified lithium iron manganese phosphate positive electrode material. According to the invention, the problem of electrochemical performance degradation caused by manganese dissolution is reduced, and the discharge capacity and the cycle stability of the lithium ion battery are improved.

The application relates to the technical field of battery materials. Disclosed are a lithium nickel-manganese acid positive electrode material, a preparation method thereof, a positive electrode and a battery. The lithium nickel-manganese acid positive electrode material comprises a base material and a first coating layer and a second coating layer successively coated on the surface of the base material; the chemical general formula of the base material is Li(Li a Ni b Mn c Fe d Sb e )O 4‑x , wherein a+b+c+d+e=2, 0<=x<=0.2, 0<=a<=0.1, 0.4<=b<=0.5, 1<=c<=1.5, 0.1<=d+e<=0.4; the first coating layer comprises NbTi(PO4)3, and the mass ratio of the first coating layer to the base material is 0.1-5:100; the second coating layer comprises a carbon material, and the mass ratio of the second coating layer to the base material is 0.1-5:100. The lithium nickel-manganese acid positive electrode material provided by the embodiment of the application has excellent electrochemical performance.

The present invention relates to a high-entropy hydrotalcite-modified carbon fiber photothermal conversion material and a preparation method thereof. The technical scheme is: in a nitrogen or argon atmosphere, the waste fabric is heat-treated at a temperature of 300 to 700°C for 120 to 300 minutes to obtain a carbon fiber with a porous structure; then the metal salt is mixed in an equimolar ratio and stirred at 100 to 200°C for 10 to 25 minutes to obtain a mixed salt melt; then the carbon fiber with a porous structure is immersed in the mixed salt melt for 10 to 30 minutes, taken out, washed with water, and dried to obtain a high-entropy hydrotalcite-modified carbon fiber photothermal conversion material. The present invention has the characteristics of short production cycle, simple process, low cost, cheap and easy-to-obtain raw materials, and large-scale production. The prepared high-entropy hydrotalcite-modified carbon fiber photothermal conversion material has excellent photothermal conversion efficiency and high water evaporation rate.

The utility model provides a heat dissipation module, a heat dissipation device and a heat dissipation system, the heat dissipation module comprises a plate body and a plurality of fins, the plate body is internally provided with a first cavity, the fins are internally provided with second cavities, the plurality of fins are arranged, the second cavities of the plurality of fins are communicated with the first cavity to form a phase change cooling cavity, and in addition, the second cavities of the plurality of fins are communicated with the first cavity to form a phase change cooling cavity. The phase-change cooling cavity comprises a first cavity and a second cavity, the area, in the second cavity, of the gaseous phase-change working medium converted into the liquid phase-change working medium is a phase-change area, the multiple fins are arranged, and the phase-change areas of the adjacent fins are communicated through communicating pipes. Therefore, the gaseous phase change working medium in the phase change cooling cavity can be concentrated in the fins corresponding to the high-temperature area, the heat dissipation capability of the fins in the heat dissipation module is fully utilized, and the heat dissipation efficiency of the heat dissipation module can be improved.

This invention provides a lithium titanium dioxide sodium phosphate anode material and an aqueous lithium-iodine battery based thereon, belonging to the field of secondary battery technology. The chemical formula of the lithium titanium dioxide sodium phosphate anode material is Li. x Na y Ti2(PO4)3, where 0

The present invention belongs to the field of permanent magnetic materials, and specifically relates to a sintered NdFeB magnetic powder forming release agent and a method for preparing a high coercive force magnet. The specific composition of each component in the release agent is as follows: 1.0-5.0wt.% of zinc stearate, 0.5-2.0wt.% of epoxy resin, 0.5-2.0wt.% of nano Cu, 1.0-10.0wt.% of rare earth organic matter Dy(C5H5)3; the balance is gasoline solvent; when preparing a non-dense green body, the above-mentioned release agent is coated on the inner wall of the mold and the upper and lower pressure heads, and the release agent is coated on the surface of the non-dense green body before sintering. The release agent proposed in the present invention comprehensively considers the multifunctionality of magnet molding lubrication and diffusion. At the same time, in the actual magnet preparation process, there is no need to mix materials, change the existing production process, and no additional long-term heat treatment. The process is simple and the energy consumption is low. While maintaining a high magnetic energy product, the coercive force of the Nd-Fe-B sintered magnet is successfully increased to more than 20kOe. The method is suitable for large-scale production.

The invention discloses a lithium iron phosphate positive electrode material, a preparation method thereof and a battery, and belongs to the technical field of batteries, the preparation method comprises the following steps: mixing an iron source, a lithium source, a phosphorus source, a dopant and a grinding agent, and carrying out dry ball milling to obtain precursor powder; and sintering the precursor powder under the protection of inert gas to obtain the lithium iron phosphate positive electrode material. According to the method, high-purity graphite / acetylene black is used as a grinding agent and a carbon source, a doping agent is added at the same time, a solvent does not need to be used, a ball-milled material does not need to be dried, uniform compounding of a precursor and construction of a conductive network are achieved in one step through the mechanochemical effect, and then the conductive network is obtained through high-temperature sintering. The prepared lithium iron phosphate positive electrode material has excellent electrochemical performance and relatively high compaction density, and still keeps relatively good electrochemical performance in a low-temperature environment, so that a new development direction is provided for production of lithium iron phosphate.

The application provides a modified ternary positive electrode material and a preparation method and application thereof. The modified ternary positive electrode material comprises a ternary positive electrode material matrix and a coating layer. The coating layer comprises a first coating layer existing on the surface of the ternary positive electrode material matrix and a second coating layer existing on the surface of the first coating layer. The first coating layer comprises Al2O3. The second coating layer comprises Li3AlF6 and LiF. The modified ternary positive electrode material provided by the application has high specific capacity, excellent cycle stability and excellent rate performance by doping boron elements in the matrix phase and constructing a specific double-layer coating layer on the surface of the matrix.

The invention discloses a lithium iron phosphate positive electrode material and a preparation method thereof, a positive electrode plate and a secondary battery, and the preparation method comprises the following steps: adding a carbon source and dry yeast into a solvent, and culturing the dry yeast to obtain a first solution; sequentially mixing the dissolved iron source and the dissolved phosphorus source into the first solution, and drying to obtain a ferrophosphorus intermediate; fully mixing the ferrophosphorus intermediate with a lithium source to obtain a precursor; and sintering the precursor, and crushing to obtain the lithium iron phosphate positive electrode material with the surface mesoporous structure. The lithium iron phosphate positive electrode material has good strain capacity in the cycle process, deformation and cracking of particles in the cycle process are reduced, lithium consumption is reduced, and the lithium iron phosphate positive electrode material has excellent cycle performance.

This invention belongs to the technical field of comprehensive utilization of phosphorus iron slag and lepidolite, specifically disclosing a rubidium- and cesium-doped lithium iron phosphate material, its preparation method, and its application. The rubidium- and cesium-doped lithium iron phosphate cathode material provided by this invention has a Li, Rb, and Cs mass ratio of 4:(0.3~0.9):(0~0.6). Specifically, lepidolite powder is roasted with concentrated sulfuric acid to obtain roasted slag, which is then treated with water to obtain a lithium-containing solution. Finally, the lithium-containing solution is mixed with phosphorus iron slag and subjected to a hydrothermal reaction to prepare the lithium iron phosphate material. This invention innovatively demonstrates that under hydrothermal reaction conditions, the lithium extraction solution from lepidolite can react with phosphorus iron slag in situ to generate rubidium- and cesium-doped lithium iron phosphate, improving the recycling performance of lithium iron phosphate and achieving high-value utilization of waste residue.

The invention discloses surface nanocrystallization modified composite copper powder and a preparation method and application thereof.The preparation method of the surface nanocrystallization modified composite copper powder comprises the steps that micron-order or submicron-order copper powder is soaked or dispersed in a copper precursor solution, and a copper precursor comprises carboxylic acid copper salt; modifying the copper precursor on the surface of the micron-grade or submicron-grade copper powder through a chemical adsorption effect; and the micron-grade or submicron-grade copper powder modified with the copper precursor is subjected to heating decomposition or reduction treatment, so that the copper precursor forms nano-copper particles, and the composite copper powder with the nano-copper particles modified on the surface of the micron-grade or submicron-grade copper powder is obtained. According to the surface nanocrystallization modified composite copper powder and the preparation method and application thereof, the nano-copper particles are introduced to the surface of the micron-sized copper powder for modification, so that the specific surface area and the surface activity of the copper powder are improved; and diffusion channels and driving force during copper powder sintering are increased, the compactness of a sintered body is improved, and the sintering temperature is reduced.

The application provides a lithium nickel manganese oxide positive electrode material and a preparation method and application thereof. The lithium nickel manganese oxide positive electrode material comprises an inner core and a cation and anion co-coating layer arranged on the surface of the inner core, and a phase of the lithium nickel manganese oxide positive electrode material comprises a spinel phase and a layered phase. The lithium nickel manganese oxide positive electrode material contains the spinel phase and the layered phase, the spinel phase and the layered phase have very good compatibility, the diffusion channel of Li is increased, and the lithium nickel manganese oxide positive electrode material has good rate performance and maintains high capacity.

The invention relates to the technical field of negative electrode materials, in particular to a preparation method of a fast-charging artificial graphite negative electrode material, which comprises the following steps: S1, coarsely breaking, drying and crushing one or more of needle coke green coke, petroleum coke green coke, needle coke calcined coke and petroleum coke calcined coke to obtain a precursor A; s2, mixing inorganic alkali and / or organic alkali to obtain a pore-forming agent B; s3, mechanically mixing the precursor A obtained in the step S1 and the pore-forming agent B obtained in the step S2 according to the mass ratio of 100: (5-20) to obtain a precursor C; s4, sintering the precursor C to obtain a modified porous precursor D; s5, performing high-temperature graphitization treatment on the porous precursor D to obtain porous artificial graphite E; s6, asphalt and resin are mixed according to the ratio, and then a coating agent F is obtained; and S7, mixing the porous artificial graphite E with a coating agent F, and granulating to obtain the fast-filling artificial graphite G. The material is endowed with excellent and stable performance by regulating and controlling a composite structure formed by mutual crosslinking of asphalt and resin.

The invention provides a composite positive electrode material and a preparation method thereof, a positive plate and a lithium ion battery. The composite positive electrode material comprises a LiMnxFe1-x-a-bLaaCebPO4 core, and a Zr1-cZncPO4 layer and a carbon layer which are coated on the surface of the LiMnxFe1-x-a-bLaaCebPO4 core in sequence from inside to outside, 0.5 < = x < = 0.7, 0.005 < = a < = 0.03, 0.005 < = b < = 0.02, and 0.08 < = c < = 0.12. In the composite positive electrode material, La < 3 + > occupies the site of Li < + >, so that the diffusion speed of lithium ions is increased; ce < 3 + > dynamically eliminates lattice oxygen vacancies through a variable valence effect, so that the manganese dissolution activation energy is improved, and the dissolution of manganese ions is reduced. And the Zr1-cZncPO4 layer can block the migration path of Mn < 2 + >, so that the dissolution of manganese ions is further reduced.