22results about How to "Improve capacity play" patented technology

The invention relates to the technical field of lithium batteries, in particular to a composite binder aqueous solution, a silicon-based negative pole piece and a preparation method and application of the silicon-based negative pole piece. The preparation method of the composite binder aqueous solution comprises the following steps: dissolving a water-based polymer binder and a micromolecular physical crosslinking agent in water, adding pyrrole, stirring, adding an initiator, and mixing to obtain the composite binder aqueous solution. A small molecule physical cross-linking agent is introduced into the water-based polymer binder, and a large number of hydrogen bond binding sites are increased, so that the mechanical property of the binder is remarkably enhanced, and the machinability of the pole piece is further improved. Meanwhile, polypyrrole can be generated in the binder through in-situ polymerization, and the polypyrrole can be tightly coated on the surfaces of the silicon particles through strong interaction between the binder and the silicon particles to form a stable conductive network, so that the charge transfer capability of the electrode is remarkably improved. In addition, the composite binder is also beneficial to formation of a solid electrolyte layer rich in Li-N and participates in formation of a solid electrolyte interface layer, so that the lithium ion transmission capability of the composite binder is further improved.

The invention discloses a sodium-ion battery positive electrode material and a preparation method thereof, a positive plate and a negative-electrode-free sodium-ion battery, and relates to the technical field of sodium-ion batteries. According to the sodium battery positive electrode material provided by the invention, the inner layer is the layered oxide, the outer layer is the sodium-lanthanum-zirconium-oxygen coating layer, and the dissolution phenomenon of Fe < 3 + > in the layered oxide material can be relieved by utilizing the sodium-lanthanum-zirconium-oxygen coating layer; the sodium lanthanum zirconium oxide material belongs to a solid electrolyte and is a fast ion conductor of sodium ions, so that the injection amount of the electrolyte can be reduced, the growth of dendritic crystals can be reduced, the safety performance of the battery can be improved, and the capacity exertion of the active material can be improved. Based on the advantages, the sodium battery positive electrode material provided by the invention can improve the safety and the cycle life of the battery.

The invention discloses a precursor for a polyanionic sodium ion battery positive electrode material and a preparation method of the precursor. The chemical general formula of the precursor is NaxMyHzOa (POb) c.mH2O, wherein M is a transition metal element Fe and / or Mn; the relationship among x, y, z, a, b and c is x + 3y + z-2a + 5c-2b * c = 0, and the value range of m is greater than or equal to 0. The precursor for the polyanionic sodium ion battery positive electrode material and the preparation method thereof have the characteristics of high phase purity, high compaction density, excellent electrochemical performance, low cost and wide system applicability.

The invention discloses a high-conductivity sodium ion battery positive electrode material / organic conductive polymer composite material and a preparation method thereof, and the preparation method comprises the following steps: S1, preparation of a chain product: adding water into an organic conductive polymer monomer for dissolving, adjusting the pH value of the solution to be acidic, adding an oxidizing agent, and stirring to obtain the chain product; inducing an organic conductive polymer monomer to generate a polymerization reaction to form a chain product; s2, preparation of precursor slurry: adding a sodium source, an iron source and a sulfur source into the solution for forming the chain product, and fully dissolving to form uniform precursor slurry; s3, preparation of precursor powder: drying the precursor slurry to realize solid-liquid separation so as to obtain dried precursor powder; and S4, high-temperature sintering: calcining the precursor powder in a protective atmosphere, and naturally cooling to obtain the Na < 2 + x > Fe < 2-x > (SO4) 3 / organic conductive polymer composite positive electrode material. The preparation method has the characteristics of high electronic conductivity, low specific surface area, high compaction density and excellent electrochemical performance.

The present invention relates to a Mo-doped polyanion positive electrode material, a preparation method and an application. The chemical general formula of the Mo-doped polyanion positive electrode material is: Na b Mn x T i y Mo a M z (PO4)3; M is an element co-doped with Mo, including: Fe 3+ , Zn 2+ ,Mg 2+ , Ni 2+ , Li + , Al 3+ , Si 4+ , Zr 4+ ,Cr 3+ , Nb 5+ , Sc 3+ One or more of; the valence state of the element Mo is +6, where Mo 6+ The doping of Na + The migration barrier of the Mo-doped polyanion cathode material is Na + The Mn element migrates through three pathways, including: from the Na1 position to the Na2 position in the NAS I CON structure, through the gap between the PO4 tetrahedron and the MO6 octahedron, and across the channel between adjacent MO6 octahedrons, thereby causing the valence state of the Mn element used for charge compensation in the process of sodium insertion and extraction in the positive electrode material to be in the Mn 2+ ‑Mn 3+ ‑Mn 4+ Transition between.

This invention relates to a method for improving the consistency of battery cell sorting based on DC internal resistance time-domain response subdivision. The method includes: performing a DC internal resistance test on the battery cells to be sorted, the DC internal resistance test including constant current discharge of the battery cells to be sorted, and collecting voltage and current time series data of the battery cells to be sorted during the constant current discharge process. A time reference is determined for the constant current discharge to reach a target current steady state, and multiple response time intervals are determined based on the time reference. Using the EIS principle, a reference voltage value before constant current discharge and the interval voltage value corresponding to each response time interval are determined. Multiple time-domain segmented equivalent impedance parameters of the battery cells to be sorted are calculated. The battery cells to be sorted are then sorted according to the multiple time-domain segmented equivalent impedance parameters. This method can improve the consistency of DC load response among battery cells in the same group and is beneficial for improving the capacity utilization, power output, temperature rise dispersion, and cycle aging consistency after battery cell grouping.

This application proposes a layered cathode material, its preparation method, and a lithium-ion battery. The layered cathode material includes a lithium source, a manganese source, and a grain refiner. By adding a grain refiner to the raw materials, the layered cathode material has a larger half-maximum width at half-maximum (FWHM) and a smaller grain size, or an I(010) / I(021) intensity ratio in the range of 0.3 to 0.85. This shortens the lithium-ion diffusion path, which is beneficial for lithium-ion diffusion, thereby improving the rate performance, capacity utilization, and cycle stability of the material. The layered cathode material of this application is a primary particle and a single-crystal material. Compared with conventional polycrystalline materials, single-crystal materials do not have the anisotropic stress problem of polycrystalline materials. The stress distribution of single-crystal materials is uniform, and the mechanical stress is stable. Therefore, it has less expansion stress and less volume deformation during charge and discharge, which can reduce the generation of particle cracks and effectively delay the occurrence of failure.

This invention relates to a Cr and Br dual-element doped polyanionic sodium-ion battery cathode material, sodium iron phosphate pyrophosphate, its preparation method, and its application, belonging to the field of sodium-ion battery technology. The general chemical formula of the cathode material of this invention is: Na₄Fe₂O₃. 3‑x Cr x (PO4)2P2O7Br y Where 0 < x < 0.5, 0 < y < 0.7; the precursor wet gel is obtained through a sol-gel process, dried, and then sintered. This invention relates to a Cr- and Br-doped polyanionic sodium-ion battery cathode material, sodium iron phosphate pyrophosphate. The Cr dopant enhances bulk stability, while the gradient distribution of Br forms a fast ion conduction layer on the surface. The two elements together improve the rate capability and cycle performance of the sodium-ion battery. This provides a modification strategy of significant reference value for cathode materials that suffer from low discharge specific capacity and poor cycle performance at high rates due to electron conductance differences.

The invention relates to the technical field of lithium ion batteries, in particular to a phosphate positive electrode material and a preparation method and application thereof. Provided is a phosphate-based positive electrode material having a minimum particle diameter of 80 nm or more and a particle diameter dispersion coefficient (PDI) of less than 0.4. The minimum particle size of particles of the phosphate positive electrode material is controlled to be greater than or equal to 80nm, so that fine powder particles less than 80nm cannot appear in the particles, and the stability of a crystal structure of the material is improved, so that the overall thermal stability and cycle performance of the material are improved; the particle size dispersion coefficient PDI is further controlled to be less than 0.4, and when the particle size dispersion coefficient is smaller, the distribution of the positive electrode material is more uniform, so that the phosphate positive electrode material with narrow particle size distribution and uniform particle size is obtained, the processing performance of the material is effectively improved, and the rate cycle stability is improved.

This invention discloses a composite anode material for an all-solid-state lithium-ion battery, its preparation method, and the all-solid-state lithium-ion battery itself, relating to the field of all-solid-state lithium-ion battery technology. The composite anode material comprises a silicon skeleton and multiple functional coating layers sequentially covering the outer surface of the silicon skeleton. The pore size and porosity of the silicon skeleton gradually increase from the inside out. The multiple functional coating layers, from the inside out, sequentially include a carbon layer, an ion-conducting layer, and an interface protection layer, wherein the ion-conducting layer is a composite material of a sulfide solid electrolyte and a lithium-containing compound. The silicon skeleton of this invention has a non-uniform pore distribution. This pore distribution structure allows the loose outer layer of the skeleton to effectively absorb stress, thereby more effectively protecting the structural integrity of the core region. This application achieves a synergistic effect of stress buffering, ion transport, and interface stabilization through multiple functional coating layers, suppressing the possibility of silicon anode failure and effectively extending the cycle life of the battery.

The invention discloses an alkaline secondary battery current collector base band and application thereof.The current collector base band comprises a metal base band, a plurality of burr units are evenly distributed on the metal base band in an array mode, and each burr unit is composed of front trapezoid burrs and back trapezoid burrs which are symmetrically arranged; long bottom plates of the front trapezoid burrs and long bottom plates of the back trapezoid burrs are adjacent and parallel to each other, front trapezoid burr long bottom edges formed by the front trapezoid burrs are connected with the metal base band, front trapezoid burr short bottom edges form front trapezoid burr ends, and back trapezoid burr long bottom edges formed by the back trapezoid burrs are connected with the metal base band. And the reverse trapezoidal burr short bottom edge forms a reverse trapezoidal burr end part. The current collector base band adopting a specific trapezoidal burr bidirectional arrangement mode effectively improves the conductivity of the polar plate and reduces the battery resistance, so that the assembled alkaline secondary battery has high rate performance, long cycle service life and other electrical properties and high specific energy, and meanwhile, the requirements of high power and high specific energy of the battery are met.

The present application discloses a ternary positive electrode active material and a preparation method thereof, a secondary battery, a battery module, a battery pack and an electric device containing the same. The ternary positive electrode active material comprises a nickel-rich layered oxide positive electrode active material, the surface of which is co-coated with an oxygen ion conductor and an oxide additive; the chemical composition of the nickel-rich layered oxide positive electrode active material is LiNi x Co y A z O2, wherein A = Mn or Al, 0.6 ≤ x < 1, 0 < y ≤ 0.2, z = 1-x-y. In the technical solution of the embodiment of the present application, the high-nickel ternary layered oxide positive electrode active material is co-coated and modified by synergistically introducing oxides and oxygen ion conductors to improve the material interface stability, improve the capacity loss problem, and make the battery exhibit excellent electrochemical performance.

The present invention provides a composite lithium iron phosphate positive electrode material and a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing lithium ferrite powder and ferrous phosphide and performing a primary granulation treatment to obtain first particles, and performing a one-step roasting treatment to obtain a precursor A; (2) mixing lithium ferrite powder and a carbon source and performing a secondary granulation treatment to obtain second particles, and performing a two-step roasting treatment to obtain a precursor B; (3) compounding the precursor A and the precursor B, adding a carbon source, and performing a calcination treatment to obtain the composite lithium iron phosphate positive electrode material. The lithium iron phosphate positive electrode material of the present invention has a high compaction density of the pole piece, excellent rate performance under low temperature conditions, effectively improving the LFP capacity while improving the material stability, and the preparation method is simple in process, low in production cost, energy-saving and high-efficiency, and suitable for industrial production.

The invention discloses a cylindrical battery and a power utilization device, and belongs to the technical field of new energy materials. By adopting an in-situ polymerization technology, a compact and continuous quasi-solid electrolyte network is constructed in the cylindrical roll core, so that the safety pain points that a traditional liquid lithium ion battery is easy to leak and inflammable and explosive are fundamentally solved, and meanwhile, the technical bottlenecks that a solid-solid interface of a solid-state battery is poor in contact and large in impedance are overcome; according to the battery system, atomic-scale close contact of the electrolyte and the electrode particles is realized, the intrinsic safety and the energy density of the battery are remarkably improved while high ionic conductivity is ensured, and the battery system is particularly suitable for the power and energy storage fields with extremely high safety requirements.

The invention discloses a positive electrode additive and a preparation method thereof, a positive electrode plate and a preparation method thereof, and a lithium ion battery. The positive electrode additive with a core-shell structure is obtained by reacting the surface layers of the high-molecular organic acid particles through esterification reaction to form an ester shell. The positive electrode additive can form a polymer network in the positive electrode plate, and the polymer has the physical characteristic of high swelling, can absorb electrolyte in a rich liquid state and can release the electrolyte in a poor liquid state, and has the main effects of remarkably improving the infiltration effect of the positive electrode plate, improving the battery capacity, improving the interface and improving the cycle performance. And moreover, the performance is improved, and meanwhile, the liquid injection coefficient of the lithium ion battery can be remarkably reduced. The positive pole piece and the lithium ion battery both use the positive pole additive, so that the positive pole piece and the lithium ion battery also have relatively good performance.

This invention provides a secondary battery comprising a positive electrode, a negative electrode, and an electrolyte layer, wherein: the negative electrode is composed of a conductive current collector, a negative electrode active material, and a non-alkali metal monovalent ion conductor; the secondary battery is a sodium secondary battery or a lithium secondary battery. The secondary battery of this invention, such as an alkali metal secondary battery, is more stable under environmental conditions, easier to manufacture, less expensive, has improved rate performance, and significantly increased cycle life.

This invention discloses an oil-based binder, anode slurry, a composite silicon anode, and an all-solid-state battery, belonging to the technical field of all-solid-state battery energy storage materials. The oil-based binder comprises component A and component B; component A is a copolymer composed of acrylate, long-chain ether oxygen bonds, and epoxy active groups, while component B is a styrene-ethylene-butene-styrene block copolymer. This binder is prepared through free radical polymerization and physical blending, is soluble in weakly polar solvents, and is suitable for composite silicon anode systems based on sulfide solid electrolytes. The binder provided by this invention possesses excellent ion conduction ability, mechanical properties, and interfacial adhesion, effectively buffering the volume expansion of the silicon anode, maintaining electrode structural stability and interfacial ion transport, thereby significantly improving the rate performance and long-cycle stability of the all-solid-state battery.

The application provides a method for preparing lithium manganese iron phosphate from iron hydroxyphosphate, wherein ferrous sulfate is purified to form a ferrous sulfate solution, hydrogen peroxide, phosphoric acid, ammonium dihydrogen phosphate solution, titanium sulfate and ammonia are sequentially added into the solution to form a mixed slurry after reaction, the mixed slurry is heated to a certain temperature and kept for a certain time, and then water washing and pressure filtration are performed to form iron hydroxyphosphate precursors with different iron-phosphorus ratios; the iron hydroxyphosphate precursors are subjected to flash drying and high-temperature sintering and crushing to obtain iron hydroxyphosphate precursors with different iron-phosphorus ratios and different specific surface areas; the iron hydroxyphosphate precursors are crushed and mixed to obtain iron hydroxyphosphate finished products; high-iron-phosphorus-ratio iron hydroxyphosphate and low-iron-phosphorus-ratio iron hydroxyphosphate are mixed according to a certain proportion, and lithium source, manganese source and phosphorus source are proportioned according to a certain proportion, and carbon source and additives are added to form a mixture; and after processes such as ball milling, sand milling, spray drying, sintering, crushing, screening, batching and packaging are performed on the mixture, lithium manganese iron phosphate finished products are obtained.

The invention provides a pre-infiltration method for a lithium battery, which comprises the following steps of: injecting a pre-infiltration compound into a battery cell of the lithium battery, and sealing and standing, so that the battery cell is fully infiltrated by the pre-infiltration compound; injecting an electrolyte into the battery cell subjected to standing, and aging; and exhausting the aged battery cell so as to discharge the pre-impregnating compound. Compared with a traditional method, the pre-infiltration method can improve the production efficiency and the yield, reduce the negative influence on the electrical performance and improve the capacity exertion, the rate capability and the like of the battery, and is particularly suitable for high-specific-energy batteries and semi-solid batteries.

The chemical formula of the sodium ion positive electrode material is Na < 10 > / 12 + 2x + 2y > Ni < 3 > / 12 + / -0.01 Fe < 4 > / 12 + / -0.01 Mn < 5 > / 12 + / -0.01 Cu < x > Zn < y > M < z > O < 2 > (1 + x + y + z), the content satisfies Ni + Fe + Mn = 1, x is greater than 0 and less than or equal to 0.08, y is greater than 0 and less than or equal to 0.04, M contains Ti, and the content of M satisfies 0 and less than or equal to 0.05. The sodium ion positive electrode material provided by the invention has relatively high capacity while reducing the cost, can effectively improve the structural stability of the ion positive electrode material, and has relatively excellent cycle retention rate performance.

This invention relates to the field of sodium-ion battery technology, specifically disclosing a sodium-ion battery cathode material, its preparation method, a battery cell, and a battery. The cathode material involves the sequential stacking of single-crystal particles, near-single-crystal particles, and aggregated particles along a vertical direction from a foil substrate. The single-crystal particles are single, blocky crystals; the near-single-crystal particles are secondary particles formed by the stacking and connection of multiple single-crystal particles, which are mixed with and fill the gaps between the single-crystal particles; the aggregated particles are secondary particles formed by the stacking of multiple micro / nano particles, used to provide a rapid migration channel for ions at the cathode, shortening the ion migration distance and enabling fast charging of the sodium-ion battery. This invention involves the sequential stacking of three layers of three types of active particles—single-crystal particles, near-single-crystal particles, and aggregated particles—starting from the vertical direction of the foil substrate. This multi-gradient cathode material design greatly improves the space utilization and energy carrying capacity of the active material on the electrode, while also providing fast charging capability.

The invention provides a negative electrode active material, the negative electrode active material comprises a silicon-containing material and lithium lanthanum titanium oxide, the silicon-containing material has a three-dimensional porous structure, the lithium lanthanum titanium oxide is embedded into pores of the silicon-containing material, the chemical formula of the lithium lanthanum titanium oxide is Li3xLa (2 / 3)-xTiO3, and the value range of X is 0 < x < (2 / 3); the lithium lanthanum titanium oxide is embedded into the pores of the silicon-containing material with the three-dimensional porous structure, the silicon-containing material and the lithium lanthanum titanium oxide form tight interface contact, a mixed ion electron conductor of the silicon-containing material and the lithium lanthanum titanium oxide can be formed when the battery is charged and lithium is embedded, and the electron conductivity of the silicon-containing material and the lithium lanthanum titanium oxide is enhanced; on one hand, the internal resistance of the battery cell is reduced, and on the other hand, the silicon-based material selectively adsorbs more LLTO and is embedded in the LLTO, so that the volume expansion of silicon particles is effectively buffered, the repeated growth of an SEI film is solved, the capacity exertion and cycle life of the lithium ion battery are improved, the negative electrode with higher silicon content is applied to the battery, and the specific energy of the battery is improved; and the requirements of the market on high-energy-density batteries are met.