12results about How to "Improve ion conduction ability" patented technology

The invention discloses a lithium ion battery with a silicon-carbon negative electrode, belongs to the technical field of lithium ion batteries, and overcomes the defect of poor cycling stability of a lithium ion battery with a silicon-carbon composite material as a negative electrode in the prior art. According to the lithium ion battery with the silicon-carbon negative electrode, a negative electrode active material layer comprises a silicon-carbon composite material; the Raman spectrum characteristics of the silicon-carbon composite material meet the following conditions: (D1 + D3) / (D2 + D4) = K, wherein K is more than or equal to 0.5 and less than or equal to 3; d1, D2, D3 and D4 correspond to the intensities of the characteristic peak 1, the characteristic peak 2, the characteristic peak 3 and the characteristic peak 4 respectively; and the electrolyte comprises an additive A1. And the additive A1 interacts with the specific silicon-carbon material, so that the generation of an SEI film is promoted, and the ionic conductivity, the stability and the elasticity of the SEI film are improved, thereby improving the cycling stability and the safety of the silicon-carbon battery.

The invention discloses an iron-based positive electrode lithium supplementing material, a preparation method thereof, a positive electrode material and an iron-based positive electrode lithium supplementing material, the iron-based positive electrode lithium supplementing material comprises a base material, doping elements and a coating layer, the base material is Li5FeO4, the doping elements are Co and Sr, and the coating layer is a carbon coating layer coating the surface of the Li5FeO4 base material. The prepared positive electrode lithium supplementing material has the advantages of stable structure, good conductivity and excellent air stability.

The invention relates to the technical field of battery materials, and provides a composite lithium supplementing material and a preparation method and application thereof.The composite lithium supplementing material comprises at least two lithium supplementing materials, the space between every two adjacent lithium supplementing materials is filled with a functional material, and the functional material comprises at least one of an ion conductor material, an electronic conductor material and a catalyst. According to the composite lithium supplement material provided by the invention, the functional material is filled between the two lithium supplement materials, so that the lithium supplement materials and the functional material have a relatively large contact area, and the function of the functional material is more favorably played, including improvement of ion conduction performance or electron conduction performance of the lithium supplement material and reduction of decomposition voltage of the lithium supplement material; therefore, the lithium supplement material has a high lithium removal effect.

The invention provides a battery monomer, a negative pole piece, a battery device and a power utilization device, the battery monomer comprises the negative pole piece, the negative pole piece comprises a bottom coating arranged on at least one side of a negative current collector, and the bottom coating comprises a plurality of first bulges protruding back to the negative current collector and a first concave part between two adjacent first bulges; the bottom coating layer comprises a first binder; the active material layer is arranged on one side, opposite to the negative electrode current collector, of the bottom coating layer, the active material layer comprises a plurality of second bulges protruding towards the bottom coating layer and second concave parts between two adjacent second bulges, and the active material layer comprises a second binder; the first bulge is coupled with the second concave part, and the second bulge is coupled with the first concave part; the mass content a of the first binder in the undercoat layer is greater than the mass content b of the second binder in the active material layer. The dynamic performance and the cycle life of the battery monomer are relatively good; the battery device and the power utilization device at least have the above beneficial effects.

The invention relates to the technical field of new energy batteries, in particular to a sodium-ion battery positive electrode additive and a preparation method thereof, a sodium-ion battery positive electrode material, a sodium-ion battery positive electrode plate and a sodium-ion battery. The preparation method of the sodium ion battery positive electrode additive comprises the following steps: S1, grinding and mixing a sodium source, a lanthanum source, a chlorine source and a fluorine source in an inert atmosphere according to a stoichiometric ratio; wherein a is a lanthanide rare earth element; and S2, calcining the powder obtained in the step S1 for 6-24 hours at 250-450 DEG C under a sealed condition, naturally cooling, and crushing to obtain the sodium ion battery positive electrode additive. A sodium-rich anti-perovskite material with high ionic conductivity is prepared through a solid-phase melting method, high-valence lanthanum and halogen fluorine are introduced for doping, an oxygen-vacancy-rich structure is obtained through an interface ion exchange reaction after annealing heat treatment, sodium-oxygen octahedron distortion in a crystal is caused, and the performance of the material is improved. The stability and the ion migration rate of the material are effectively improved.

The application discloses a kind of composite positive plate and lithium ion battery and preparation method.The composite positive plate includes positive current collector;Positive current collector surface is coated with positive active material layer;Positive active material layer surface is coated with solid electrolyte layer;Positive active material layer includes positive active material, oxide solid electrolyte, conductive agent, dispersing agent and binder and the mass ratio of these components is (91.9%~97.45%): (0.5%~5%): (1%~1.5%): (0.05%~0.1%): (1%~1.5%);Solid electrolyte layer includes oxide solid electrolyte, conductive agent, dispersing agent and binder and the mass ratio of these components is (13.9%~70.9%): (13.2%~49.2%): (0.6%~3.8%): (13.2%~49.2%);The application is conducive to guaranteeing battery thermal safety while significantly improving battery fast-charging capability.

This invention discloses a modified silicon-carbon composite material, an anode sheet, and a battery. The modified silicon-carbon composite material includes porous carbon, ring-patterned graphite nanoparticles, and silicon nanoparticles. The silicon nanoparticles are located within the pores of the porous carbon, and / or, within the pores of the ring-patterned graphite nanoparticles, and / or, in the pores between adjacent ring-patterned graphite nanoparticles. In the provided modified silicon-carbon anode material, the introduction of ring-patterned graphite nanoparticles into the porous carbon matrix improves conductivity through the ordered structure of the ring-patterned graphite nanoparticles, enhances ion conduction through the porous structure, and allows silicon to be deposited in the pores of the ring-patterned graphite nanoparticles, suppressing Si expansion and maximizing silicon capacity, thereby improving the conductivity, rate performance, and cycle performance of the silicon-carbon anode.

The invention belongs to the field of battery materials, and discloses a high-performance composite positive electrode material and a preparation method and application thereof.The preparation method of the high-performance composite positive electrode material comprises the steps that an MOF material and a flaky conductive carbon material are mixed through ball milling, then a solid electrolyte material is added for continuous ball milling, then the positive electrode material is added for continuous ball milling, roasting is conducted in the inert atmosphere, and the high-performance composite positive electrode material is obtained. Obtaining a finished product. An electron-ion-active material interpenetrating structure is formed by the MOF material, the sheet-shaped conductive carbon material and the solid electrolyte material, so that the interface contact can be improved, the stability of the composite positive electrode can be improved, the cycle life of the battery can be remarkably prolonged, and the requirements of the long-cycle-life solid-state lithium metal battery can be met.

The invention discloses a preparation method of a sulfur and polyether copolymer composite positive electrode and a lithium-sulfur battery, and the preparation method comprises the following steps: (1) mixing an ether monomer solution and a solvent, adding a lithium salt and an initiator, and stirring until the mixture is clear and transparent to obtain a precursor solution; (2) mixing the precursor solution with sulfur powder, putting the mixture into a pulping box for ball milling, and then drying to obtain a sulfur-polyether copolymer; (3) preparing positive electrode slurry by taking the sulfur-coated polyether copolymer, conductive graphite, acetylene black and polyvinylidene fluoride as raw materials; and blade-coating the positive electrode slurry on the carbon-coated aluminum foil, and drying to obtain the sulfur-polyether copolymer composite positive electrode. In the sulfur-coated polyether copolymer, the surface of partial sulfur powder is coated with the polyether polymer, so that the ion transmission rate and the electrochemical stability of a positive electrode can be enhanced; the surface of the residual sulfur powder is not coated by the polyether polymer, and the residual sulfur powder is exposed and can be combined with the conductive agent, so that the conductivity of the positive electrode is enhanced. According to the sulfur and polyether copolymer composite positive electrode, the lithium-sulfur battery can have excellent conductivity and chemical stability, and the cycle performance and the rate capability of the lithium-sulfur battery under different current densities can be greatly improved.

The application provides a kind of porous carbon material, silicon-based composite material and preparation method, negative electrode and secondary battery, and is particularly related to the technical field of secondary battery.The porous carbon material contains nanometer carbon dot crystallites;The size of the nanometer carbon dot crystallites is 2-8nm.The nanometer carbon dot crystallites include graphene quantum dot crystallites;The porous carbon material contains amorphous continuous region, and the nanometer carbon dot crystallites are dispersed in the amorphous continuous region;The specific surface area of the porous carbon material is 200-3000m 2 / g, and the pore volume is 0.2-3.0cm 3 / g.The porous carbon material provided by the application contains 2-8nm carbon dot crystallites, which improves the conductivity and ion conductivity of the porous carbon material, avoids poor contact between silicon and carbon, improves the contact performance of silicon and carbon, and improves the rate performance and cycle stability of the silicon-based composite material.Furthermore, the capacity stability and coulombic efficiency of the secondary battery are improved.

The invention discloses a preparation method of a sulfur-poly ionic liquid copolymer composite positive electrode and a lithium-sulfur battery, and the preparation method comprises the following steps: (1) mixing an ionic liquid and a solvent, adding a lithium salt and an initiator, and stirring until the mixture is clear and transparent to obtain a precursor solution; (2) mixing the precursor solution with sulfur powder, putting the mixture into a pulping box for ball milling, and then drying to obtain a sulfur-coated polyion liquid copolymer; (3) preparing positive electrode slurry by taking the sulfur-coated polyion liquid copolymer, conductive graphite, acetylene black and polyvinylidene fluoride as raw materials; and blade-coating the positive electrode slurry on the carbon-coated aluminum foil, and drying to obtain the sulfur-polyion liquid copolymer composite positive electrode. In the polyion liquid copolymer prepared by the invention, the surface of part of sulfur powder is coated with the polyion liquid, so that the ion transmission rate and the electrochemical stability of the positive electrode can be enhanced; the surface of the residual sulfur powder is not coated by the polymerized ionic liquid, and the residual sulfur powder is exposed and can be combined with the conductive agent, so that the conductivity of the positive electrode is enhanced. According to the sulfur-poly ionic liquid copolymer composite positive electrode, the lithium-sulfur battery can have excellent conductivity and chemical stability, and the cycle performance and the rate capability of the lithium-sulfur battery under different current densities can be greatly improved.

This invention discloses a method for preparing a polymer-coated halide solid electrolyte and a solid-state battery. The method involves dissolving a polymer in an oily solvent to form a solution, then adding the halide solid electrolyte to the solution to form a solid electrolyte suspension. The solid electrolyte suspension is then dried to obtain the polymer-coated halide solid electrolyte. The solid-state battery uses the polymer-coated halide solid electrolyte to prepare the solid electrolyte separator layer. This invention not only effectively leverages the advantages of halide electrolytes but also avoids the problems of deliquescence and difficulty in dehydration during storage and use, effectively solving physical contact issues and improving ion conduction capability. This addresses the problems of poor electrolyte processability, numerous material interfaces, and high large-scale production costs in existing solid-state batteries.