10results about How to "High voltage platform" patented technology

The invention provides a positive electrode material and a preparation method thereof, a positive electrode plate, a battery and an electric device. The preparation method of the positive electrode material comprises the following steps: preparing a layered oxide internal core material, wherein the layered oxide internal core material is a layered oxide containing sodium and transition metal; preparing a polyanion external coating material, wherein the polyanion external coating material comprises sodium ferromanganese pyrophosphate; and fusing the layered oxide internal core material and the polyanion external coating material in a mechanical fusion manner to obtain the positive electrode material with the layered oxide and polyanion compounded core-shell structure. The positive electrode material comprises a layered oxide internal core material and a polyanion external coating material; the core material in the layered oxide comprises Na1 + xMO2, X is more than or equal to-0.3 and less than or equal to 0.2, and M comprises at least one of Fe, Ni, Cu, Zn, Co, Ti and Mn; and the external coating material of the polyanion system comprises Na < 4 > Fe < 3-y > Mn < y > (PO4) < 2 > P < 2 > O < 7 > / C.

The invention relates to the field of sodium ion batteries, and discloses a sodium vanadium phosphate composite positive electrode active material, a preparation method thereof and a sodium ion battery. The sodium vanadium phosphate composite positive electrode active material comprises a sodium vanadium phosphate inner core and a carbon coating layer coating at least part of the surface of the sodium vanadium phosphate inner core; and the compaction density of the sodium vanadium phosphate composite positive active material is greater than 1.8 g / cm < 3 >. When the positive electrode active material with relatively high compaction density is applied to the sodium ion battery, the diffusion path of sodium ions can be reduced, the energy density of the battery is improved, the discharge capacity of the battery is increased, the internal resistance of the battery is reduced, the polarization loss is reduced, the voltage platform of the battery is improved, and the rate capability and the cycle performance of the battery are ensured.

The invention provides a sodium ion battery positive electrode material, a preparation method and a secondary battery, the positive electrode material comprises a base material and a carbon material coating the surface of the base material, the chemical formula of the base material is Na < 0.7 > Mn < 0.67-x > Ti < x > Ni < 0.33-y-z > Li < y > Mg < z > O < 2 >, x is greater than or equal to 0.01 and less than or equal to 0.15, y is greater than or equal to 0.01 and less than or equal to 0.07, z is greater than or equal to 0.01 and less than or equal to 0.07, and a manganese source of the base material is selected from manganous-manganic oxide; based on the mass of the positive electrode material, the mass percentage of the carbon material is 5wt%-10wt%; the coating thickness of the carbon material is 100 nm to 300 nm. The manganese source of the matrix material is regulated and controlled to be selected from manganous-manganic oxide, and the titanium element, the lithium element and the magnesium element are synergistically co-doped at different sites of the positive electrode material, so that the positive electrode material has better structural stability; according to the present invention, through the synergistic effect of the coating structure design and the material selection, the positive electrode material has characteristics of stable high potential platform, high capacity retention rate and high discharge specific capacity, and the application of the positive electrode material in the secondary battery can improve the cycle performance of the secondary battery while improving the energy density and the voltage platform of the secondary battery.

The invention belongs to the technical field of electrochemical energy storage batteries, and particularly relates to a chlorine-free simple magnesium salt electrolyte for a magnesium-sulfur battery as well as a preparation method and application of the chlorine-free simple magnesium salt electrolyte. The electrolyte comprises magnesium salt, ionic liquid, an organic ether solvent, an amine solvent and an organic phosphide additive. The solvation structure is regulated and controlled through the synergistic effect of multiple components, the compatibility of the electrolyte with the sulfur positive electrode and the magnesium negative electrode is improved, and the electrochemical performance of the magnesium-sulfur battery is improved. Specifically, the amine solvent is used as a strong polar solvent to improve the solubility of the magnesium polysulfide, so that the diffusion and redox conversion kinetics of the magnesium polysulfide are promoted, and the organic phosphide is used as an additive to effectively improve the specific discharge capacity and voltage platform of the magnesium-sulfur battery. Meanwhile, due to the addition of the ionic liquid, the stability of a magnesium negative electrode / electrolyte interface is improved, the transmission capacity of Mg < 2 + > is enhanced, and the overpotential of magnesium deposition / dissolution is reduced. In addition, the electrolyte does not contain chloride ions, so that the corrosion problem caused by the chloride ions is avoided.

This invention provides a method for recycling and upgrading spent lithium iron phosphate (LFP) cathode materials to regenerate lithium manganese iron phosphate (LFP). The method utilizes a manganese ion-catalyzed hydrogen peroxide and sulfuric acid system to leach the spent LFP, improving acid leaching efficiency. Simultaneously, the manganese ions remaining after acid leaching are used as a manganese source to generate LFP precursors, ultimately synthesizing high-performance LFP cathode materials. This invention features a simple process, low cost, and is suitable for large-scale industrial production.

This invention discloses a preparation method and application for improving the fast-charging performance of graphite composite materials. The preparation method involves mixing a graphite precursor with a catalyst and a conductive liquid, ball milling the mixture, followed by pre-carbonization, low-temperature graphitization, and acid washing to obtain a graphite precursor material. Then, the graphite precursor is mixed with a heteroatom polymer, a phosphorus compound, and an organotitanium compound, and heat-treated to obtain the graphite composite material. The graphite composite material prepared by this invention utilizes a catalyst to enhance the anisotropy of carbon during graphitization, and improves electronic conductivity through the conductive agent doped into the core. The titanium dioxide coating on the composite material's outer shell has the characteristics of large interlayer spacing, low expansion rate, and structural stability, which improves the lithium-ion insertion / extraction rate and rate performance. Since phosphorus itself has high specific capacity and a high voltage plateau, phosphorus doping improves the specific capacity and voltage plateau of the composite material, thus enhancing its fast-charging performance.

This application discloses a lithium manganese iron phosphate (LFP) cathode material, its preparation method, and its applications. The LFP cathode material comprises LFP particles, which, based on the iron content distribution, are sequentially divided into a core region, a middle region, and a surface region from the center of the LFP particles towards the surface. The middle region covers the core region, and the surface region covers the middle region. From the core region to the middle region, the iron content in the first composite region (forming the core and middle regions) decreases gradually; from the middle region to the outer surface of the surface region, the iron content in the second composite region (forming the middle and surface regions) increases gradually. The LFP cathode material of this application exhibits high compaction density, high energy density, and a high voltage plateau, as well as good cycle performance and low-temperature performance. Its preparation ensures the stability of the electrochemical performance of the prepared LFP cathode material.

The invention relates to a preparation method and application of a vanadium-titanium doped modified lithium manganese iron phosphate positive electrode material, and belongs to the technical field of lithium ion battery positive electrodes. The preparation method comprises the following steps: uniformly mixing a phosphoric acid source, a manganese source, an iron source, a lithium source, a carbon source, a vanadium source and / or a titanium source, a surfactant and a cosolvent, and carrying out ball milling and vacuum drying to obtain a lithium iron manganese phosphate precursor; and sintering the lithium manganese iron phosphate precursor at a high temperature of 600-750 DEG C for 6-12 hours to obtain the vanadium and / or titanium doped modified lithium manganese iron phosphate positive electrode material. An aluminum foil substrate is coated with the active substance components of the vanadium and / or titanium-doped modified lithium manganese iron phosphate positive electrode material, and the lithium battery positive electrode can be obtained. The doped modified lithium manganese iron phosphate positive electrode material is high in charge-discharge specific capacity, and has relatively high cycling stability and rate capability.

The invention discloses a fluorine filler modified polymer electrolyte and a preparation method thereof, and belongs to the field of new energy battery electrolytes.According to the polymer electrolyte, on one hand, dissociation of lithium salt is promoted through the Lewis acidity of fluorine filler, and high room-temperature ionic conductivity is achieved; and on the other hand, a stable interface layer is constructed through metal elements and fluorine elements in the filler, stable long circulation of the symmetric battery is realized, and stable operation of the conversion type positive electrode material ferric fluoride at room temperature is realized. According to the polymer electrolyte prepared by the scheme, the defects of a conversion type positive electrode material can be overcome, so that system construction of a lithium ion battery with higher energy density is realized, and the polymer electrolyte is expected to become an ideal choice for high value-added scenes such as flexible electronics and wearable equipment.

The application adopts silver nanowires with good conductivity to in-situ grow and modify carbon monofluoride materials, the silver nanowires are not simply adsorbed on the surface of the carbon monofluoride, but are inlaid and grown in the carbon monofluoride to form a conductive network, thus increasing the conductivity of the carbon monofluoride material, effectively improving the voltage hysteresis problem of the carbon monofluoride material, and improving the rate performance of the carbon monofluoride material. The carbon monofluoride electrode material with good conductivity and in-situ grown silver nanowires is applied to a lithium-carbon monofluoride battery, effectively improving the voltage hysteresis of the carbon monofluoride electrode, improving the platform voltage of the electrode, and the effect is remarkable. Compared with the carbon monofluoride electrode in the prior art, the voltage hysteresis and the platform voltage are greatly improved, and the discharge performance of the electrode is greatly improved.