31results about How to "Improve high voltage performance" patented technology

The invention discloses an aromatic polyoxadiazole fiber mica insulating paper. According to the mass percentage, its raw material composition is: 3% to 70% of aromatic polyoxadiazole fiber, 2% to 50% of aromatic polyoxadiazole fiber Polyoxadiazole precipitated fiber, 28% to 95% mica. The POD fiber and POD precipitated fiber are subjected to ultrasonic and piezoelectric effect treatment, and then matched with mica scales in proportion, mixed evenly, stabilized pulp, cylinder paper machine, and shaped; finally, POD fiber mica is obtained by hot pressing Paper products or directly get POD fiber mica paper products. It improves the high temperature resistance and high voltage performance of single POD fiber paper; improves the mechanical strength and impact resistance (corona resistance) of single mica paper, and is a new type of insulating material integrating the characteristics of POD fiber and mica. It can be widely used in various large electrical equipment, engines, special purposes and civil applications that require insulation.

The invention discloses a non-aqueous electrolytic solution, a preparation method thereof and a lithium secondary battery, mainly comprising the following raw materials: an organic solvent, a conductive lithium salt and an additive, and the organic solvent is composed of a cyclic carbonate and a linear carbonate solvent Composition, the concentration of the conductive lithium salt in the organic solvent is 0.8-1.5mol / L, the additive is at least one of the compounds represented by the following general formula (I) in an amount of 0.01-8.0wt.%, the formula Among them, the above-mentioned compounds can be added to the non-aqueous electrolyte to improve the cycle life of the lithium-ion battery, as well as high voltage (greater than 4.2V), high and low temperature performance and suppress the gas swelling problem of the battery.

The technical field of the ternary lithium ion secondary battery of the present invention specifically discloses the electrolyte solution of the ternary lithium ion battery, which includes a functional additive, a solvent and an inorganic conductive lithium salt; the functional additive. The invention also discloses the application of the electrolyte solution containing functional additions. In the present invention, adding the functional additive in the electrolyte, as a film-forming additive, can form a layer of uniform and dense coating film on the surface of the positive electrode of the lithium-ion battery, inhibiting the oxidative decomposition of the electrolyte solvent and The electrolyte and lithium salt decomposition product HF corrode the electrode material, stabilize the structure of the positive electrode material, inhibit the dissolution of transition metal ions, and improve the cycle stability and rate performance of lithium-ion batteries at high voltage and high temperature.

The invention provides high voltage resistant electrolyte solution with double boron imide lithium. The electrolyte solution comprises four compositions: organic solvent comprising double boron imide lithium, other lithium, carbonate ester and / or ether, other functional additive and high-voltage additive. The molar concentration of the lithium with double boron imide lithium and the high-voltage additive in the electrolyte solution is 0.001-2mol / L, the molar concentration of the other lithium in the electrolyte solution is 0-2mol / L, and the molar concentration of other functional additive in the electrolyte solution is 0-0.5mol / L. The lithium with double boron imide lithium is an ionic compound, and the positive ions are lithium ions. The electrolyte solution provided by the invention has double boron imide lithium and greatly improves the cryogenic property and the high voltage performance of the electrolyte solution. After the electrolyte solution is applied to a lithium battery at a high temperature of higher than 50 DEG C or a low temperature of lower than minus 20 DEG C, the percentage of the volume of the battery is improved, and the circulating life and the storing life of the lithium battery are prolonged.

The invention provides an electrolyte for improving the high voltage performance of a lithium battery. The electrolyte comprises four components of a lithium salt, a carbonic ester and / or ether organic solvent, a high voltage additive and other functional additives, wherein the molar concentration ranges of the lithium salt and the high voltage additive are both 0.001-2 mol / L, and the molar concentration ranges of other functional additives are 0-0.5 mol / L. According to the electrolyte provided by the invention, the high voltage additive is added into the electrolyte of the lithium battery to improve the stability of the electrolyte at the high voltage, thereby being favorable for prolonging the high voltage cycle life of the lithium battery and inhibiting the swelling of the lithium battery.

The invention discloses non-aqueous electrolyte, a preparation method of the non-aqueous electrolyte as well as a lithium ion battery. The non-aqueous electrolyte mainly comprises the following raw materials: an organic solvent, conducting lithium salt and an additive, wherein the organic solvent consists of cyclic carbonate and a linear cyclic carbonate solvent; the concentration of conducting lithium salt in the organic solvent is 0.8-1.5mol / L; the additive is 0.01-10wt% of at least one of the following compounds shown in a formula (I) shown in the specification. After the compounds are added into the non-aqueous electrolyte, the cyclic service life of the lithium ion battery can be prolonged; the high-voltage and high-low-temperature performances are improved; the air swelling problem of a battery can be inhibited.

The invention provides a novel cyclic phosphate additive, a nonaqueous electrolytic solution containing the same and a lithium ion battery. The additive is a compound represented by formula (I), wherein X is C or S, R is C 1‑4 Alkyl or C 1‑4 alkoxy. The non-aqueous electrolyte containing the compound represented by formula (I) as an additive can improve the high-voltage performance of the battery, and is especially suitable for lithium-ion batteries in which the ternary material is the positive electrode and the silicon-carbon material is the negative electrode.

The invention relates to a positive electrode material of a high-capacity dynamic-type nickel-rich lithium ion battery and a preparation method. The molecular formula of the positive electrode material of the high-capacity dynamic-type nickel-rich lithium ion battery is LiaNi1-x(MM')xO2.M''O, wherein a is equal to 0.9-1.2, x is more than or equal to 0 and less than or equal to 0.7, and M is at least one of Co, Mn and Al; M' is at least one of Co, Al, V, Mn, Zr, Mg, Ti, Cr, Zr, La, Ce, Pr, Nd, Nb, Mo, Y, Sr, Ba, B, Sr, Sn and Ta; M''O is a cladding layer, and M'' is Co and Al. The invention also relates to a preparation method for the positive electrode material of the high-capacity dynamic-type nickel-rich lithium ion battery. The material machining performance is excellent, the battery prepared by utilizing the material, the cycling performance and the high-voltage performance are excellent, the safety and stability in use can be realized, not only can the application performance requirement of a portable electronic device on the battery be met, but also the positive electrode material is applicable to the power battery.