31results about How to "Inhibit surface activity" patented technology

Provided is a composite powder that is stable even when present in water for a long period of time. The composite powder results from forming, on the surface of an inorganic powder, a first coating layer comprising a water-repellant organic compound, and a second coating layer formed on the first coating layer and comprising at least one compound selected from the group consisting of silicon dioxide, a hydrate of silicon dioxide, an oxide of aluminum, and a hydroxide of aluminum.

The invention provides an electrolytic solution, comprising a non-aqueous organic solvent, an electrolyte lithium salt, and a first additive, the electrolyte lithium salt comprising lithium hexafluorophosphate, lithium bisfluorosulfonyl imide and lithium tetrafluorooxalate phosphate, and the first additive comprising Fluorinated anhydrides, lithium difluorooxalate borate and phosphates. The present invention also provides a lithium-ion battery comprising the above-mentioned electrolyte solution. The electrolyte solution of the invention has excellent high and low temperature performance, and can be stored and transported at room temperature.

The invention relates to a grain refiner for magnesium alloy, belonging to the field of alloy materials, in particular to the application of Al2Ca in preparing a grain refiner of magnesium alloy. The invention also relates to a grain refined type magnesium alloy, which comprises the following components by weight percent: 2.35-14.1% of Al2Ca, less than or equal to 0.3% and the balance of Mg. The preparation method of the magnesium alloy is as follows: heating Mg and Mg-Ca alloy of formula ratio to complete melting under conditions of vacuumizing and introducing inert gas; evenly stirring; adding pure Al of formula ratio; insulating heat until Al and Ca react completely; and cooling to obtain magnesium alloy containing Al2Ca, namely the grain refined type magnesium alloy. With respect to the grain refined type magnesium alloy prepared according to the method, the cast-condition crystallite dimension is 40 mu m which is obviously lower than the crystallite dimension of magnesium alloy in which the grain refiner is not added under the same condition, wherein the crystallite dimension of magnesium alloy without adding the grain refiner is 110 mu m.

The application provides an electrolyte and an electrochemical device, the electrolyte contains additive A and additive B, the mass percentage of the additive A in the electrolyte is 0.001% to 10%, the additive The mass percentage of B in the electrolyte solution is 0.1%-10%, and the conductivity of the electrolyte solution at 25°C is 4mS / cm-12mS / cm. The invention can improve the cycle performance and storage performance of the electrochemical device, especially improve the cycle performance and storage performance of the electrochemical device under the condition of high temperature and high voltage, and simultaneously can take into account the low temperature performance.

The invention belongs to the technical field of lithium ion batteries, and discloses a high-voltage functional electrolyte, a preparation method and an application thereof. The high-voltage functional electrolyte is prepared by adding a functional additive equivalent to 0.25% to 5% of the mass of the ordinary electrolyte in the ordinary electrolyte; the structural formula of the functional additive is shown in formula (1). The functional additive diethyl (thiophene-2-ylmethyl) phosphate of the present invention can be used as a high-pressure film-forming additive and a flame-retardant additive of a lithium ion electrolyte, and the electrolyte containing the functional additive does not burn, and the The room temperature and high temperature cycle performance of the lithium-ion battery at 3-5.0V is improved, and the application prospect is good. .

The present application provides an electrolyte and an electrochemical device. The electrolyte contains an additive A and an additive B. The mass percentage of the additive A in the electrolyte is 0.001% to 10%. The mass percentage content of B in the electrolyte is 0.1% to 10%. The present application can improve the cycle performance and storage performance of the electrochemical device, especially the cycle performance and storage performance of the electrochemical device under the condition of high temperature and high voltage.

The application provides an electrolyte solution and a battery. The electrolytic solution includes electrolyte salt and organic solvent, and the organic solvent includes cyclic carbonate and chain carbonate. The electrolyte also includes additive A and additive B. Additive A is a positive electrode film-forming additive, additive B is a negative electrode film-forming additive, and the reduction potential of additive B is higher than that of cyclic carbonate. The electrolyte is 25 ° C The electrical conductivity is 6mS / cm~10mS / cm. The electrolyte solution of the present application can improve the cycle performance and storage performance of the battery, especially the cycle performance and storage performance of the battery under high temperature and high voltage conditions, while also taking into account the low temperature performance of the battery.

This application provides an electrolyte and an electrochemical device, in which the electrolyte comprises an additive A and an additive B, wherein the additive A is present in an amount of 0.01% to 10% by mass in the electrolyte and the additive B is present in an amount of 0.1% to 10% by mass in the electrolyte and the electrolyte has a conductivity of 6mS / cm to 10mS / cm at 25°C. The present invention can improve the cycle performance and storage performance of the electrochemical device, in particular, improve the cycle performance and storage performance of the electrochemical device under high temperature and high voltage conditions while keeping the low temperature performance.