9results about How to "Improve low temperature cycle performance" patented technology

The invention provides a composite solid electrolyte film and a preparation method thereof, and a winding type all-solid-state battery. The composite solid electrolyte film comprises a polymer matrix and an oxide solid electrolyte, the oxide solid electrolyte is filled in the polymer matrix, and the polymer matrix is a copolymer of an aniline compound and a polyester polymer. A copolymer of an aniline compound and a polyester polymer is used as a polymer matrix, so that the prepared composite solid electrolyte film has certain flexibility and can be set to be thin, and a winding type all-solid-state battery can be conveniently assembled subsequently. The oxide solid electrolyte can play a filling role, so that the composite solid electrolyte film has certain mechanical strength besides flexibility; and the conductivity of the composite membrane can be improved, so that the low-temperature cycle performance of the all-solid-state battery is improved. The composite solid electrolyte film adopts an oxide solid electrolyte and a polymer matrix, and no liquid electrolyte exists in the system, so that the safety performance of the battery can be improved.

The invention discloses a preparation method of a lithium ion battery with a double-layer negative electrode and a long-service-life low-temperature starting power supply. The preparation method comprises the following steps: step 1, preparing positive electrode slurry; step 2, preparing a first layer of negative electrode slurry; step 3, manufacturing a second layer of negative electrode slurry; 4, manufacturing a positive electrode current collector; 5, manufacturing a double-layer negative electrode current collector; and 6, manufacturing the long-life low-temperature starting power supply lithium ion battery. The first layer of negative electrode slurry and the second layer of negative electrode slurry are coated on the negative electrode plate to form the double-layer negative electrode current collector, and then the double-layer negative electrode current collector is assembled to form the long-life low-temperature starting power supply lithium ion battery. The energy density of the lithium ion battery is effectively improved, the surface smoothness is enhanced, the conductivity is improved, the cycle life is prolonged, the safety performance is improved, and the prepared lithium ion battery has excellent low-temperature large-current pulse performance, low-temperature rate performance, low-temperature cycle performance, excellent normal-temperature fast-charge and fast-discharge cycle performance and good charge-discharge first efficiency.

The invention relates to the field of battery materials, in particular to a lithium ion battery which comprises a positive pole piece, a negative pole piece, electrolyte and a diaphragm located between the positive pole piece and the negative pole piece, the electrolyte comprises boron-containing lithium salt, based on the total mass of the electrolyte, the mass percentage of the boron-containing lithium salt is 2wt%-10wt%, and the mass percentage of the diaphragm is 10wt%-10wt%. The diaphragm comprises a base film and a gluing layer located on at least one surface of the base film, and the coverage rate of the gluing layer is 5-70%. The boron-containing lithium salt has a relatively large anion volume, so that surface charges of anions can be delocalized, dissociation of the lithium salt is facilitated, and the conductivity of the electrolyte and the transference number of lithium ions are improved. Meanwhile, a large number of fluorine elements in the boron-containing lithium salt can stabilize the lithium supplement agent material and reduce the oxidation of the electrolyte. The gluing layer can improve the bonding force between the diaphragm and the positive pole piece, shorten the migration path of lithium ions and shorten the migration time of the lithium ions; meanwhile, the gluing layer can weaken diffusion of large-volume anions.

The invention provides a conjugated naphthalenone diimide compound, which belongs to the technical field of electrochemical energy storage and energy conversion, and the structural formula of the compound is shown as any one of formulas 1-3. An electrode material prepared from the compound has excellent electrochemical stability, high specific capacity, good rate capability and excellent cycle life, and is suitable for novel energy storage systems such as zinc ion batteries and aluminum ion batteries. The invention also provides a preparation method and application of the conjugated naphthalenone diimide compound.

The application relates to a preparation method and application of a low-temperature-resistant gel polymer electrolyte, and belongs to the technical field of polymer electrolytes.The application solves the technical problem of providing a preparation method of a low-temperature-resistant gel polymer electrolyte suitable for a lithium metal battery.The method uniformly mixes an ether electrolyte, allyl potassium trifluoroborate, a crosslinking agent such as pentaerythritol tetraacrylate and fluorinated ethylene carbonate to obtain a precursor solution;uniformly mixes azobisisobutyronitrile and the precursor solution to obtain a reaction solution;and then performs a warming reaction to obtain a low-temperature-resistant gel polymer electrolyte.The application significantly improves the frost resistance of the electrolyte by introducing an anion conductor, can realize good low-temperature resistance, and improves the low-temperature cycle performance.The electrolyte has high conductivity, overcomes the defect of low ion conductivity of a conventional polymer electrolyte at low temperature;has high lithium ion transference number, effectively solves the defect of low transference number of a polymer electrolyte Li + +.

This invention discloses the use of a class of polysubstituted cyclic ether compounds as solvents for lithium-ion battery electrolytes. The polysubstituted cyclic ether compounds are alkyl-substituted cyclic ether solvents. These polysubstituted cyclic ether solvents have lower dielectric constants and lower ion desolvation energies, and exhibit good stability with lithium metal / graphite anodes. More importantly, these polysubstituted cyclic ether compounds have no special restrictions on the type of lithium salt. Using these polysubstituted cyclic ether compounds can significantly improve the low-temperature performance of batteries, thus broadening their applicability.

This invention discloses a high-safety, high-cycle-life in-situ cured gel polymer electrolyte and its preparation method, belonging to the field of lithium-ion battery technology. The electrolyte is formed by in-situ polymerization of a gel precursor solution inside the battery triggered by an energy field. The precursor solution contains acrylamide and / or methacrylamide polymerizable monomers, multifunctional acrylate and / or methacrylate crosslinking agents, phosphorus-containing polymerizable flame-retardant components, an initiator, lithium salt, and an organic solvent. The preparation method includes preparing the precursor solution, injecting it into the pores of the battery cell, and in-situ curing triggered by heat or ultraviolet light. Through the synergistic effect of in-situ gelation and gradient electrodes, continuous and stable ion transport channels and flame-retardant networks are constructed within the electrode pores, thereby simultaneously improving the battery's abuse safety and low-temperature cycle life.

The application relates to the technical field of batteries, and provides an electrochemical device, which comprises a positive electrode sheet, a negative electrode sheet and a separator, the negative electrode sheet comprises a negative electrode current collector and a negative electrode active layer located on at least one side surface of the negative electrode current collector, the negative electrode active layer comprises a negative electrode active material, the negative electrode active material comprises a silicon-based material; the separator comprises a base film and a ceramic layer arranged on at least one side surface of the base film, the ceramic layer comprises a plurality of interval distributed stripes and a plurality of interval areas located in the middle of adjacent stripes, the width of the stripe is A1 mu.m, and the width of the interval area is A2 mu.m; the electrochemical device satisfies the relationship formula 0.06 <= A * C <= 0.9, wherein A is A1 / A2, and C is the mass content of silicon elements in the negative electrode active material. The scheme effectively alleviates the volume expansion of the silicon negative electrode, improves the charging and discharging efficiency, reduces the minimum residual power level capable of effective discharging, and improves the available discharge depth.

The application discloses a water-based electrolyte and a zinc ion hybrid capacitor comprising the water-based electrolyte. The water-based electrolyte is a water-based electrolyte for a zinc ion hybrid capacitor, and comprises a zinc salt, an electrolyte additive and water. The electrolyte additive comprises a first additive and a second additive. The first additive is an organic antifreezing agent, and the second additive is a heterocyclic nonane. The volume fraction of the organic antifreezing agent in the water-based electrolyte is greater than 0.1% and less than 40%. The water-based electrolyte of the application uses the organic antifreezing agent and the heterocyclic nonane as additives, and the two cooperate with each other. The water-based electrolyte can not only prevent freezing and avoid ice formation, but also modify the zinc negative electrode interface, reduce the Zn 2+ reduction rate, alleviate concentration polarization, thereby facilitating inhibition of dendrite growth, and can also inhibit the side reaction of the zinc negative electrode, thereby improving the low-temperature cycle performance of the zinc ion hybrid capacitor.