9results about How to "Improve long-cycle performance" patented technology

The invention discloses a silicon-oxygen-carbon-based negative electrode material and a preparation method thereof, and belongs to the technical field of lithium battery negative electrode materials, and the preparation method comprises the following steps: (1) mixing alcohol, water and acid to prepare an acid solution with the pH value of 2-4, adding organosiloxane into the acid solution, and stirring in a water bath to obtain a siloxane hydrolysate; (2) adding a pyrene compound into the siloxane hydrolysate, and carrying out ultrasonic treatment; (3) adding alkali, stirring in a water bath at 20-50 DEG C for 1-3 hours, and then freeze-drying to obtain a precursor of SiOC; and (4) placing the precursor in an atmosphere furnace, sintering in an argon atmosphere, and naturally cooling to obtain the modified negative electrode material SiOC. The amorphous carbon content of the prepared SiOC is increased, on one hand, the electronic conductivity of the SiOC can be improved, and on the other hand, volume expansion in the charging and discharging process can be relieved.

The application discloses a sodium ion battery positive electrode material and a preparation method thereof. By adding cheap, non-toxic, environment-friendly and easily-degradable water-soluble cellulose as an additive, the growth of a specific crystal direction can be inhibited. The hydrophilic group of the water-soluble cellulose can change the coordination environment of metal ions and reduce the entry of water molecules into the crystal lattice. In addition, by introducing the water-soluble cellulose, high-concentration reactant feeding can be realized, which is beneficial to reducing the consumption of industrial water. Meanwhile, compared with other existing additives, the water-soluble cellulose is environment-friendly, easily-degradable, low in production and separation cost, and free of toxic by-product generation. The prepared open three-face cubic Fe-based Prussian blue analogue material is good in dispersity, high in purity and uniform in morphology, and as a sodium ion battery positive electrode material, has a reversible capacity of 155.40 mAhg ‑1 at 0.1C (1C=170 mAhg ‑1 ) and a first discharge coulombic efficiency of 97.83%.

The invention relates to a high-nickel ternary positive electrode material, a preparation method of the high-nickel ternary positive electrode material, a positive plate and a battery. The high-nickel ternary positive electrode material comprises secondary particles formed by aggregating primary particles, the high-nickel ternary positive electrode material satisfies the following conditions: in the primary particles of the secondary particles, the ratio A [101] / A [104] of the total surface area A [101] of the [101] crystal face to the total surface area A [104] of the [104] crystal face satisfies 0.05 < = A [101] / A [104] < = 0.3; the concentration of the cobalt element in the secondary particle is in gradient distribution which is sequentially decreased from the surface to the center, and the cobalt element concentration C [surface] in the surface area of the secondary particle and the cobalt element concentration C [core] in the core area of the secondary particle meet the condition that (C [surface]-C [core]) / C [core] is larger than or equal to 0.05 and smaller than or equal to 0.2. According to the scheme provided by the invention, the low-temperature discharge capacity, the high-temperature storage stability and the long cycle life of the ternary material can be synergistically improved.

This disclosure provides a lithium-ion battery and its preparation method. Specifically, the positive electrode film layer includes a positive electrode active material, a solid electrolyte, a conductive agent, and a binder; the average fiber orientation angle of the positive electrode film layer is 40°~50°. The solid electrolyte layer includes a solid electrolyte and a binder; the average fiber orientation angle of the solid electrolyte layer is 40°~50°. By using a positive electrode film layer or a solid electrolyte layer with an average fiber orientation angle of 40°~50°, the electrochemical interface stability is improved, thereby enhancing the long-cycle performance and rate performance of the lithium-ion battery.

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 invention belongs to the technical field of batteries, and provides an electrolyte additive, an electrolyte and a battery. The electrolyte additive comprises a first additive and a second additive, wherein the first additive comprises fluorine-containing straight-chain lithium carboxylate; the second additive comprises at least one of vinylene carbonate, fluoroethylene carbonate and vinylethylene carbonate; and the third additive comprises an ester additive. The electrolyte additive provided by the invention is beneficial to reducing the impedance of the lithium ion battery, improving the long cycle performance of the battery and improving the high-temperature performance of the battery.

The embodiment of the invention provides a composite current collector, a preparation method thereof and an all-solid-state battery. The composite current collector comprises a polymer conductive layer comprising a first surface and a second surface which are oppositely arranged; a first metal layer and a first conductive ion electronic layer are sequentially arranged on the first surface in the direction away from the polymer conductive layer; a second metal layer and a second conductive ion electronic layer are sequentially arranged on the second surface along the direction far away from the polymer conductive layer; the polymer conductive layer comprises a first polymer and a first conductive agent; the first ion-conducting electronic layer and the second ion-conducting electronic layer both comprise a solid electrolyte, a second polymer and a second conductive agent. According to the composite current collector, the polymer conductive layer, the first metal layer, the second metal layer, the first conductive ion electronic layer and the second conductive ion electronic layer are arranged, so that the finally obtained composite current collector shows excellent performance in the aspects of thermal stability, safety, electron and ion transmission efficiency and corrosion resistance.

This invention belongs to the field of lithium-ion battery technology, and relates to a polysiloxane alkyl polymer electrolyte membrane, its preparation method, and a polymer solid-state lithium-ion battery. The electrolyte membrane uses a porous support material as a three-dimensional porous framework, with the polymer electrolyte filling the pores of the porous support material and coating its surface. The polymer electrolyte comprises a siloxane alkyl polymer and a conductive lithium salt, using 1,1,3,3-tetramethoxy-1,3-divinyldisiloxane as the polymer monomer. The battery constructed from this electrolyte membrane exhibits an ionic conductivity higher than 6*10⁻⁶ at room temperature. ‑4 S cm ‑1 The electrochemical stability window exceeds 4.5V.

The application relates to a halide solid-state electrolyte as well as a preparation method and application thereof, and relates to the technical field of new energy materials. 1.5 Zr 0.5 M 0.5 Cl5O 0.5 , wherein M is Ta or Nb; and the inner core is a crystalline halide electrolyte with a chemical general formula of Li 2.5 Y 0.5 Zr 0.5 Cl 6‑4x F 4x , wherein 0.05<=x<=1.45. The halide solid-state electrolyte has high ion conductivity, high oxidation potential, high mechanical performance, good chemical stability with sulfides and high air stability.