32 results about "Electrolyte cation" patented technology

The present invention proposes a secondary battery electrolyte, a preparation method thereof and a battery, wherein the electrolyte includes a solvent, an electrolyte, and an additive, wherein the solvent includes carbonate, fluorinated ether, and chloroalkane; the additive includes nitrate and sulfur dioxide . The solvent and the additive of the present invention can play a synergistic effect and change the solvation structure of the electrolyte. On the one hand, it can improve the conductivity of the electrolyte and reduce the migration resistance of electrolyte cations, thereby reducing the polarization of the battery during fast charging and improving Fast charge capacity; on the other hand, it can inhibit solvent co-intercalation, thereby improving the fast charge cycle performance of the battery. The additive of the present invention can participate in the SEI film-forming reaction on the surface of the negative electrode during charging, making the SEI film more stable, thereby further improving the fast charging cycle performance of the battery. The technical problems of low fast-charging capacity, fast-charging cycle capacity attenuation, and short life of the battery are solved through the joint action of each component. The invention also provides a preparation method of the electrolyte and a battery containing the electrolyte.

The invention provides a general method for measuring material surface property parameters. The method can measure the surface electric potential of different types of materials under different conditions accurately. The method comprises the following steps: performing saturation treatment on the material surface to be determined; mixing the saturated material which is subjected to the saturationtreatment and is to be determined with an indicating electrolyte solution; measuring equilibrium concentration values of cations and hydrogen ions in indicating electrolyte of the body solution of the mixture; calculating the material surface electric potential according to the equilibrium concentration values of the cations in the indicating electrolyte; in a further technical proposal, calculating material specific surface area and surface charge density according to the material surface potential, calculating material surface electric field intensity according to the material surface charge density, and calculating total material surface charge amount according to the surface charge density and the specific surface area. The method is obtained in the relevant technology field for the first time, which can be applied widely for measuring the surface property parameters of materials with different charge types and under different conditions, and can realize combined measurement.

The invention relates to the field of new materials, and discloses a method for preparing a powder material with an electrochemical cathode. By using an inert electrode as an anode, a massive metal, semiconductor and alloy as a cathode, and a lithium salt / sodium salt / quaternary ammonium salt organic solution, pyrrole, quaternary ammonium salt or piperidine ionic liquid or strongly alkaline water solution as an electrolyte, strong cathode polarization is carried out under constant voltage; under the action of the strong cathode voltage, the massive metal, semiconductor and alloy surface forms an unstable intermediate Mx+Ny- (M+ is an electrolyte cation, and N represents metal, semiconductor or alloy) and becomes corroded; the intermediate is very unstable in the electrolyte, and is quickly decomposed to generate an atomic cluster; the atomic cluster continues aggregate to obtain a nanoparticle sol; and finally, the sol is centrifuged / washed, and dried to obtain the powder material. The prepared powder material can be widely used in the fields of lithium ion batteries, supercapacitors, (electric) catalysis, biosensing, photovoltaic devices, micro-electronics and the like.

The present invention provides an electrolytic solution comprising carboxylate and methyl halide. Carboxylate can be combined with the cation of the electrolyte, and halogenated alkanes are small in size and can act as lubricants to reduce ion migration resistance, thereby improving the ionic conductivity of the electrolyte; potassium salt additives can change the internal electrolyte of the electrolyte The solvation status of cations and the film-forming reaction form at the electrode interface enable the formation of a thin and stable SEI film on the surface of the negative electrode, reducing the resistance of ions intercalating into the negative electrode; AgPF 6 The additive can be reduced to form nano-Ag particles on the surface of the negative electrode, which reduces the charge transfer resistance of the SEI film and reduces the ion intercalation / deintercalation resistance; through the joint action of carboxylate, methyl halide, electrolyte and additives, the battery is improved in- The discharge performance and cycle performance below 40°C can still be discharged in a deep low temperature environment of -70°C. The invention also provides a preparation method of the electrolytic solution and a battery containing the electrolytic solution.