17results about How to "Increase gram capacity" patented technology

This invention provides a positive electrode active material and its application. The positive electrode active material of this invention comprises matrix particles including lithium metal oxide and a graphite coating layer covering at least a portion of the surface of the matrix particles; the lithium metal oxide has the structure shown in Formula 1; in the X-ray diffraction pattern, the lithium metal oxide is a cubic crystal system in space group Cmca, and has a 002 peak with a 2θ of 17.9°–18.1° and a 131 peak with a 2θ of 67.0°–67.5°; Li n‑y Na y Co 1‑a M a O2, Equation 1, where 0.6 ≤ n ≤ 0.8, 0 < y ≤ 0.05, 0 ≤ a < 0.2; and M is a doping element. The unique composition and crystal structure of this positive electrode active material help improve the battery's specific capacity and cycle performance, especially under high-voltage conditions, enabling the battery to maintain excellent performance.

This application belongs to the field of electrochemical technology, and specifically relates to a modified cathode material, its preparation method, and a cathode sheet, secondary battery, and electronic device containing the material. The modified cathode material includes: a ternary cathode material; and an oxide coating on the surface of the ternary cathode material, wherein the coating is an island-like coating, and the general chemical formula of the oxide is: Li. 2‑x A (1+x) / 3 B2O6F, 0.7≤x≤0.8; wherein A includes La and at least one of Mg, Ca, Sr, Ba, Al, Cd, Co, Cr, Cu, Fe, Mn, Ni, and Zn; wherein B includes Nb and at least one of Ti, Zr, V, Mo, W, Bi, Ta, and Hf; wherein the oxide content relative to the total mass of the modified cathode material is 0.6%~1.5%. The modified cathode material provided in this application has high capacity utilization, excellent rate performance, and good thermal safety properties. Applying the modified cathode material provided in this application to secondary batteries can effectively improve the energy density and heat resistance of secondary batteries.

The invention provides a positive electrode active material and a preparation method and application thereof, the positive electrode active material has a metal oxide with a chemical composition as shown in a formula 1, and in an X-ray diffraction pattern, the positive electrode active material has a (003) peak with a 2theta of 18.8-19.1 degrees, a (006) peak with a 2theta of 37.3-37.6 degrees, a (012) peak with a 2theta of 38.9-39.2 degrees, a (104) peak with a 2theta of 45.1-45.4 degrees and a superlattice structure characteristic peak with a 2theta of 18.2-18.5 degrees. The peak intensity of the characteristic peak of the superlattice structure is not higher than 3000, and the peak intensity ratio of the peak (003) to the peak (104) is greater than 1.2. The positive electrode active material has a special superlattice structure, so that the positive electrode active material is excellent in structural stability and gram volume.

The invention discloses a production method of monocrystal lithium manganese aluminate, which belongs to the technical field of preparation of lithium ion battery cathode materials, and comprises the following steps: taking manganous-manganic oxide, lithium carbonate and an aluminum-containing raw material, with the molar ratio of lithium carbonate to manganous-manganic oxide being Li: Mn being 0.50-0.55, the molar ratio of lithium carbonate to the aluminum-containing raw material being Li: Al being 1.00-1.05, and at the same time, carrying out a reaction for 2-3 hours to obtain the monocrystal lithium manganese aluminate. Adding a doping agent accounting for 0.02%-2.0% of the theoretical product mass, and mixing to obtain a uniform raw material; sintering the raw materials in an oxygen-enriched atmosphere at 800-950 DEG C for 8-16 hours to obtain a lithium manganese aluminate semi-finished product; crushing and crushing the lithium manganese aluminate semi-finished product to obtain a crushed product; through the synergistic effect of aluminum element doping and oxygen-enriched high-temperature sintering, the structural stability of the material is fundamentally improved.

The application discloses a method for producing lithium manganese oxide as a positive material of lithium battery by dry mixing, which comprises the following steps: step one, uniformly mixing LiMnO4, manganese dioxide, nano niobium pentoxide, nano aluminum oxide, LiOH powder and boron trioxide at room temperature, and grinding to obtain a mixture; step two, stirring and mixing the mixture in step one and polyvinyl alcohol to obtain a powder mixture; step three, preparing an acidic solution by heating H2O and adding a mixture of prepared anhydrous ethanol and concentrated hydrochloric acid, and stirring to obtain the acidic solution; step four, taking part of the acidic solution and adding to the powder mixture in step two to obtain a suspension; step five, adding the remaining acidic solution into the suspension in step four, and heating to react in a sealed environment; after the reaction is completed, cooling the reaction product to obtain a crystal coated with emulsified glue; step six, sintering and screening the crystal in step five; and step seven, removing iron from the screened material to obtain a product.

The application provides a positive electrode active material with a core-shell structure, a preparation method of the positive electrode active material, a positive electrode sheet containing the positive electrode active material, a secondary battery, a battery module, a battery pack and a power utilization device. The positive electrode active material comprises an inner core and a shell covering the inner core. The inner core comprises Li 1+x Mn 1‑y A y P 1‑z R z O4. The shell comprises a first coating layer covering the inner core, a second coating layer covering the first coating layer and a third coating layer covering the second coating layer. The first coating layer comprises a crystalline pyrophosphate Li a MP2O7 and / or M b (P2O7) c P2O7 is electrically neutral. The second coating layer comprises a crystalline phosphate XPO4. The third coating layer is carbon.

The application discloses a positive electrode active material, a secondary battery and a power utilization device. The positive electrode active material comprises a core material and a shell layer distributed on the surface of the core material, the shell layer comprises at least one of an aluminum-containing oxide and a boron-containing oxide, and a fluoride. The aluminum-containing oxide and / or the boron-containing oxide can react with residual lithium compounds on the surface of the core material, thereby preventing the residual lithium compounds from reacting with a binder in a positive electrode slurry during homogenization, and helping to maintain the stability of the structure of the positive electrode active material. The fluoride can enable the shell layer to resist the attack of hydrofluoric acid in a fluorine-containing electrolyte, not only can maintain the stability of the structure of the positive electrode active material, but also can improve the passing property of electrons and ions, and improve the performance of the secondary battery, such as the specific capacity, the high-temperature cycle capability and the like.

The application belongs to the field of sodium ion battery negative electrode materials, and particularly relates to a method for preparing hard carbon material from coal and application thereof. The hard carbon material is prepared by using high-reserve coal as raw material and adopting a low-cost process. The hard carbon material obtained through special gas-phase carbon deposition process treatment has the characteristics of high initial coulombic efficiency, high reversible specific capacity and the like. The material is used as a negative electrode and applied to a sodium ion battery, so that the cost of the sodium ion battery is reduced, the energy density of the sodium ion battery is improved, and the full battery shows excellent performance.

The invention relates to a sodium-ion battery carbon negative electrode material based on high-sulfur petroleum coke and a preparation method and application thereof.The preparation method comprises the steps that a high-sulfur petroleum coke raw material is smashed into the target particle size, then in the air atmosphere, a sulfur fixing agent, an inhibitor and a surface modifier are added, after fusion granulation, gradient heating treatment, depolymerization and demagnetization are conducted, and the sodium-ion battery carbon negative electrode material is obtained; and preparing the carbon negative electrode material. Compared with the prior art, the method has the advantages that the chemical conversion process of sulfur in the high-sulfur petroleum coke can be realized, the structure of the petroleum coke is reformed, the material is endowed with rich pores, and the damage of sulfur escape to the material structure is solved. Researches show that the material prepared by the method has excellent gram volume and long cycle life.

The application discloses a preparation method of a biomass hard carbon negative electrode material, and comprises the following steps: (1) pre-carbonizing a biomass raw material, and then uniformly mixing the pre-carbonized biomass raw material with an alkali solution to obtain wet material; (2) high-temperature carbonizing the wet material in an inert atmosphere, and then rapidly cooling the high-temperature carbonized wet material to obtain carbonized biomass; the cooling rate is controlled to be 10-30 DEG C / min during the rapid cooling; and (3) physically stripping the crystalline substances on the surface of the carbonized biomass, and then crushing the carbonized biomass to obtain the biomass hard carbon negative electrode material. The biomass hard carbon needs high-temperature carbonization during processing, and the high-temperature carbonization process is used for impurity removal, so that the energy consumption is not additionally increased. The impurities are separated by using a physical method, and the process is simple and environment-friendly. Overall, the material prepared by the method has low impurity content, excellent sodium storage performance, low energy consumption in the preparation process, simple process and environment-friendly.

The invention relates to a carbonaceous material and a preparation method thereof, and a secondary battery and an electric device containing the carbonaceous material, the adsorption rate v of the carbonaceous material is greater than or equal to 0.015 and less than or equal to 0.050 when the carbonaceous material is subjected to an adsorption test by using water vapor under the conditions of constant temperature and humidity of 25 DEG C and 40% RH, and the water vapor adsorption test is carried out under the following conditions: in a constant temperature and humidity chamber of 25 DEG C and 40% RH, the adsorption rate v is greater than or equal to 0.015 and less than or equal to 0.050; a carbonaceous material with the mass of m1 is placed in a container, the water vapor adsorption mass m2 and the water vapor adsorption time t when the carbonaceous material adsorbs water vapor to be balanced are recorded, the water vapor adsorption rate v is equal to m2 / (m1 * t), the measurement unit of m1 is g, the measurement unit of m2 is g, and the measurement unit of t is h. The carbonaceous material can give consideration to relatively high gram volume, relatively high first coulombic efficiency and relatively high structural stability.

The application discloses a silicon-carbon composite material and a preparation method, application and lithium ion battery thereof. The preparation method of the silicon-carbon composite material comprises the following steps: S1, performing silicon deposition on pre-lithiated porous carbon by using a chemical vapor deposition method to obtain a first precursor; S2, coating a passivation layer on the surface of the first precursor to obtain a second precursor; S3, adding an alkaline reagent into a mixed solution containing the second precursor, a transition metal salt and a solvent, and drying to obtain a third precursor; S4, performing carbon deposition on the third precursor by using a chemical vapor deposition method to obtain a fourth precursor; and S5, performing a polymerization reaction on a slurry containing the fourth precursor, a phenolic compound and an aldehyde compound, and performing carbonization treatment after drying. The silicon-carbon composite material has good conductivity and mechanical strength, and has excellent swelling inhibition performance, and the obtained lithium ion battery can have excellent initial efficiency, specific capacity, rate performance and cycle performance.

The invention provides a sodium-ion battery positive electrode material precursor and a preparation method thereof, a sodium-ion battery positive electrode material, a sodium-ion battery and electric equipment, and relates to the technical field of new energy. The precursor of the positive electrode material of the sodium ion battery is a polyanionic precursor, the variance of the primary particle size of the precursor is smaller than 2000nm < 2 >, and the precursor is uniform in size, so that the positive electrode material obtained by sintering can be fully infiltrated and reacted with electrolyte, the transmission distance of sodium ions can be reduced, and the conductivity and the stability of the positive electrode material are effectively improved; and the positive electrode material with relatively large gram volume is obtained. According to the precursor preparation method disclosed by the invention, coupling verification is performed by controlling various process parameters, so that optimal parameter values are obtained, and the polyanionic precursor disclosed by the invention can be obtained. The positive electrode material is prepared from the precursor, and has the characteristics of high compaction, high conductivity, stable structure and high capacity.

The present application relates to iron manganese series polyanionic compound has one or two or more above structure shown in formula I, formula II, formula III: Na 4‑a Fe 2+ x M1 n1+ z1 M2 n2+ z2 Mn 2+ 3‑x‑z1‑z2 (PO4)2P2O7,0≤x<3 Formula INa 3‑a Fe 2+ x M1 n1+ z1 M2 n2+ z2 Mn 2+ 2‑x‑z1‑z2 (PO4)P2O7,0≤x<2 Formula IINa 2‑a Fe 2+ x M1 n1+ z1 M2 n2+ z2 Mn 2+ 1‑x‑z1‑z2 P2O7,0≤x<1 Formula III Through the cell electronic structure regulation mechanism improves the first circle charge and discharge process reversibility of material, the prepared phosphoric acid pyrophosphate composite, pyrophosphate composite polyanionic compound electrode material, the specific capacity is high and the rate performance is excellent.

The invention relates to the technical field of secondary batteries, in particular to a sodium-rich hard carbon material, a preparation method thereof and a sodium ion battery. The preparation method of the sodium-rich hard carbon material comprises the steps that 1, organic sodium salt and rice hulls subjected to alkali washing treatment are subjected to first smashing according to the mass ratio of 1: (0.5-3), a mixture is obtained, the organic sodium salt is selected from one or more of trisodium isocitrate, sodium methyl acetoacetate, sodium linoleate, sodium fumarate, sodium benzene sulfate and sodium n-propoxide, and the organic sodium salt is selected from one or more of trisodium isocitrate, sodium methyl acetoacetate, sodium linoleate, sodium fumarate, sodium benzene sulfate and sodium n-propoxide; (2) carrying out carbonization reaction on the mixture to obtain a hard carbon precursor; and (3) carrying out sintering treatment, secondary crushing and sieving treatment on the hard carbon precursor to obtain the sodium-rich hard carbon material. The sodium-rich hard carbon material prepared by the method has the advantages of high initial coulombic efficiency, high gram volume and the like, and can greatly improve the electrochemical performance and cycle performance of the sodium ion battery when being used in the sodium ion battery.

This invention discloses an electrode conductive additive, an electrode sheet, and an electrochemical device, relating to the field of electrochemical energy storage. The electrode conductive additive comprises a core layer and a shell layer covering at least a portion of the surface of the core layer. The core layer is a low-modulus elastomer with a compressive modulus ≤ 25 MPa. The shell layer is a conductive polymer. The particle size H of the core layer and the thickness X of the shell layer satisfy the following relationship: 1.2 ≤ (1 + 2X / H). 3 ≤3.1, this conductive additive can be added to the active layer of the electrode as a conductive agent. The conductive additive of this application uses a low-modulus elastomer as the core layer, which can absorb the stress generated by rolling, avoid the breakage of active material particles and electrode deformation, and provide a continuous conductive path through the conductive polymer coated in the shell, reduce the electrode resistance, improve the electrochemical performance of the battery, maximize the compaction density, and maintain a high specific capacity of the electrode, thus achieving economic benefits.

The invention discloses a lithium iron phosphate battery positive electrode material and a preparation method and application thereof, the preparation method comprises the following steps: S1, mixing a chelating agent, a lithium salt, a trivalent iron salt and a phosphor salt to obtain a first reaction system, and carrying out a chelation reaction under an ultrasonic-assisted condition to obtain a metal ion chelated precursor; wherein the chelating agent comprises dihydroxyethyl glycine, and the molar concentration of the dihydroxyethyl glycine, the molar concentration of the lithium salt, the molar concentration of the ferric iron salt and the molar concentration of the phosphorus salt in the first reaction system are all 0.1-0.5 mol / L; and S2, mixing the precursor obtained in the step S1 with a carbon source compound to obtain a second reaction system, and performing carbonization reaction on the obtained second reaction system to obtain the lithium iron phosphate battery positive electrode material. According to the invention, by adding the dihydroxyethyl glycine which has a chelation effect on ferric ions, the lithium iron antisite defect is reduced, the crystallinity of lithium iron phosphate crystals is increased, the charge-discharge gram capacity of the lithium ion battery is improved, and the discharge efficiency of the lithium iron phosphate battery is improved.