10results about How to "Low cycle life" patented technology

The invention relates to the technical field of battery materials, in particular to a graphite negative electrode material and a preparation method and application thereof. The graphite negative electrode material comprises graphite particles, the average length La of the graphite particles in the alpha-axis direction of microcrystals is larger than or equal to 40 nm, the average thickness Lc of the graphite particles in the c-axis direction of the microcrystals is larger than or equal to 25 nm, and the interlayer spacing d002 ranges from 0.336 nm to 0.338 nm, and the number parameter of the microcrystals contained in each single graphite particle is defined as N = D503 / (La2 * Lc); d50 is the median particle size of the graphite particles, the unit is [mu] m, and the numerical value of N is more than 0 and less than or equal to 0.04. The graphite negative electrode material disclosed by the embodiment of the invention comprises the graphite particles with stable microcrystalline structure, large microcrystalline size and large interlayer spacing, so that the expansion and stress distribution uniformity of the negative electrode material in the circulation process is improved, the diffusion of ions in the graphite particles is facilitated, the consumption of active lithium is reduced, and the service life of the negative electrode material is prolonged. And the dynamic and super-long cycle stability of the graphite negative electrode material is improved.

The invention provides a negative pole piece and a preparation method thereof, the negative pole piece comprises a current collector, a first active material layer and a second active material layer, the current collector is coated with the first active material layer and the second active material layer in sequence, and the gram volume of the first active material layer is larger than that of the second active material layer. The expansion rate of the first active material layer is greater than that of the second active material layer; the first active material layer comprises an alloy A supported by a carbon material; the second active material layer includes hard carbon. According to the negative pole piece, the alloy A supported by the carbon material combined by different alloys is prepared, so that the alloy A supported by the carbon material has different expansion coefficients and gram volumes, and the larger the gram volume is, the larger the energy density is; by preparing the N-doped and P-doped hard carbon, the conductivity of the material and the first effect of the lithium ion battery can be greatly improved, electron and lithium ion transport channels in the hard carbon are increased, the capacity of the material is effectively improved, and the performance of the battery adopting the negative pole piece is greatly improved.

The invention discloses a sulfide solid electrolyte based on ionic liquid electrowetting modification and application thereof. The preparation method of the electrolyte comprises the following steps: preparing a sulfide electrolyte into an electrolyte sheet, and coating the surface of the electrolyte sheet with an ionic liquid to form an ionic liquid film, thereby obtaining the electrolyte sheet containing the ionic liquid film; and placing the sulfide solid electrolyte between electrode plates which are arranged in parallel to assemble a parallel-plate capacitor, and applying a direct-current signal to carry out electrowetting treatment, thereby obtaining the sulfide solid electrolyte based on ionic liquid electrowetting. The specific ionic liquid is introduced into the interface of the sulfide solid electrolyte and the negative electrode for electrowetting treatment, so that the interface contact angle is effectively reduced, the interface wettability is improved, the interface impedance is reduced, the electrochemical performance of the all-solid-state battery is improved, and the cycle life of the all-solid-state battery is prolonged. The method particularly focuses on the use of imidazole and pyridine ionic liquids, and selects the appropriate ionic liquid for the lithium metal negative electrode material to realize the optimal interface modification effect.

This invention relates to the field of power management technology, and particularly to an intelligent integrated power system and control method based on multi-source collaboration, including a main power module, a backup power cluster, an energy management unit, a voltage adaptation module, a status monitoring unit, a communication module, and a load interface. Compared to existing technologies that typically use a single type of battery pack as a backup power source, which suffers from slow response speed and difficulty in withstanding instantaneous high-power surges, this invention employs a heterogeneous energy storage system composed of parallel lithium battery packs and supercapacitor modules as the backup power cluster, and uses a bidirectional DC / DC converter for intelligent control. This solution fully leverages the different advantages of lithium batteries (high energy density) and supercapacitors (high power density and rapid response), enabling the system to provide both long-term backup power support and instantaneous high-power discharge, thereby significantly improving the dynamic response capability, power support reliability, and overall service life of the backup power source.

The invention discloses a multi-element doped lithium manganese iron phosphate positive electrode material and a preparation method thereof, a positive plate and a battery, and the preparation method comprises the following steps: mixing a solution containing soluble manganese salt, iron salt and doped element metal salt with a solution of oxalate, and then reacting at 30-60 DEG C for 3-20 hours to obtain a manganese iron compound; a manganese iron compound, a phosphorus source, a lithium source, a metal oxide and a carbon source are subjected to ball milling to obtain a manganese iron lithium phosphate precursor, and the manganese iron lithium phosphate precursor is roasted in a protective atmosphere to obtain the multi-element doped manganese iron lithium phosphate positive electrode material. The ferromanganese compound is prepared by adopting a coprecipitation method, uniform phase splitting of ferromanganese of the final material is realized, related elements are doped in the coprecipitation process, uniform distribution of the doped elements is realized, and the electrochemical performance of the material is improved.

The utility model belongs to battery technical field discloses a kind of for solid-state battery's battery core pole group and solid-state battery.The battery core pole group for the solid-state battery includes positive plate, solid-state electrolyte layer and negative plate, and positive plate, solid-state electrolyte layer and negative plate are sequentially arranged to set up.And, the battery core pole group for the solid-state battery further includes at least one pore structure, pore structure is penetrated in positive plate, solid-state electrolyte layer and negative plate, pore structure is at least partially filled with elastic solid-state electrolyte, to make elastic solid-state electrolyte with positive plate, solid-state electrolyte layer and negative plate connection, can enhance the interface contact area of solid-state battery, release the stress caused by volume expansion of electrode material, improve the cycle performance of solid-state battery, and provide ion transmission fast channel, further improve the rate charge-discharge performance.

The application belongs to the technical field of Fe-Ni alloy foil, and particularly relates to a negative electrode current collector Fe-Ni alloy foil and a preparation method thereof. In the Fe-Ni alloy foil, the mass percentage of iron is 35-65%, the mass percentage of nickel is 35-65%, and the sum of the mass percentages of the two is greater than or equal to 99% and less than or equal to 100%. The application aims to solve the technical problems of poor mechanical properties of the Fe-Ni alloy foil in the prior art and poor controllability of Fe and Ni content in production, and provides an Fe-Ni alloy foil with excellent mechanical properties and controllable Fe and Ni content.

This invention belongs to the field of lithium manganese iron phosphate cathode material preparation, and relates to a method for preparing spherical high-density lithium manganese iron phosphate cathode material. This invention utilizes the acid solubility of phosphoric acid to spherically modify the surface of the lithium manganese iron phosphate precursor. The phosphate ester and phosphate diester bonds contained in phosphoric acid can form phosphorus-rich soluble substances with iron, manganese, and other metal elements in the precursor under heating conditions. These substances can dissolve the metal ions on the precursor surface under water bath heating, and then the metal ions are redeposited onto the precursor surface by water bath cooling. Through repeated water bath heating, cooling, and stirring, the crystal planes of the precursor are dissolved and regrown, ultimately forming a spherical precursor.

The application discloses a kind of full tab battery multilayer tab directional flow injection process, comprising the following steps: step one, the full tab battery pole piece with multilayer tab structure is prepared, and the surface of pole piece is formed directional flow groove and conical flow hole by laser etching or mechanical stamping, and flow groove is distributed along the length direction of pole piece and is connected with the staggered connection of multilayer tab group;By designing multilayer tab structure on the surface of the pole piece of full tab battery, combined with directional flow groove and flow hole, the electrolyte infiltration path is optimized, the synergistic effect of the spatial distribution of multilayer tab and flow groove is utilized, the efficient and uniform distribution of electrolyte is realized, the injection time is significantly shortened, the bubble residue is reduced, and the battery energy density and cycle life are improved.The flow design of multilayer tab and dynamic vacuum injection parameter control are suitable for high-capacity battery manufacturing, such as power battery and energy storage battery.

The application relates to a preparation method of a magnetic lithium ion sieve coated with Fe-doped ZrO2, and relates to a preparation method of a lithium ion sieve. 3+ The application creatively adopts Fe-doping and ZrO2 coating to prepare the magnetic lithium ion sieve, simultaneously reduces the dissolution loss of manganese and iron by means of metal cation ion doping and coating, realizes efficient solid-liquid separation, greatly increases the service life of the lithium ion sieve, and is applicable to lithium extraction from various lithium-containing solutions due to the acid and alkali resistance of ZrO2. The method comprises the following steps: 1, preparing FO; 2, preparing LMFO; 3, preparing ZrO2@LMFO; and 4, preparing ZrO2@HMFO. The process is simple in preparation, the dissolution loss of manganese and iron tends to be stable in multiple cycles, the magnetic separation performance is good, the process is applicable to mass production, and is helpful to the industrialization progress of lithium extraction from salt lake brine.