44results about How to "Inhibition of reductive decomposition" patented technology

The present invention relates to a smelting used fire-resistant material high-calcium magnesium carbon brick which is made from magnesia, high-calcium magnesia, carbon element material and bonding agent according to a certain proportion after the processes of milling, molding, heat treating and finished product sorting. Comparing with the prior art the invention has the following advantages: reasonable technique, restraining the decomposition of MgO above 1700 DEG C, retarding the attrition of the brick, creating condition for the high-strength and high-stirring smelting process with temperature above 1800 DEG C, using for the nation defense building and the requirement of the industrial production, the high-calcium magnesium carbon brick is one of the most important special refractories in our country.

The invention relates to a cyclic silicate ester compound used in battery electrolyte and a preparation method thereof, and belongs to the technical field of the battery electrolyte. A structure of the compound is as shown in a formula as follows: (with reference to the specification), wherein n is greater than or equal to 2, R1 and R2 are selected from C1 to C8 linear alkyl or branched alkyl, andwhen n is equal to 2 or 3, R1 and R2 are not methyl at the same time. The invention simultaneously further provides the cyclic silicate ester compound used in the battery electrolyte and the preparation method thereof. When the cyclic silicate ester compound prepared in the invention is added into the battery electrolyte, performance of the battery can be obviously improved. The preparation method disclosed by the invention is simple to operate and mild and stable in preparation process. By control of the process disclosed by the invention, synthesis time of preparing the cyclic silicate ester compound is greatly reduced.

The invention discloses an electrolyte for improving the low temperature performance of a lithium ion battery and a lithium ion battery comprising the same. The electrolyte comprises conductive lithium salt, a non-aqueous organic solvent, and additives, wherein the additives include a conventional negative electrode film forming additive, an additive with the structure of Formula I, and an anhydride-type compound additive with the structure of Formula II. According to the battery electrolyte provided by the invention, under synergistic effects among the additive with the structure of Formula I, the anhydride-type compound additive with the structure of Formula II, a nitrogen-containing lithium salt type additive and the conventional negative electrode film forming additive, the electrolytethus has excellent film forming performance on the electrode surface, the cycle performance and the rate performance of the lithium ion battery in a low temperature condition can be effectively improved, and the high temperature cycle performance and the storage performance of the battery are little affected.

Decomposition of an aqueous electrolyte solution when an aqueous lithium ion secondary battery is charged and discharged is suppressed, and the operating voltage of the battery is improved. The aqueous lithium ion secondary battery includes an anode, a cathode, and an aqueous electrolyte solution, the anode including a composite of an anode active material and polytetrafluoroethylene, wherein peaks of the polytetrafluoroethylene at around 1150 cm <-1> and at around 1210 cm <-1> are observed in FT-IR measurement of the composite, but a peak of the polytetrafluoroethylene at around 729 cm <-1> is not observed in Raman spectroscopy measurement of the composite.

A synthetic method of triphenoxyboroxine belongs to the technical field of battery electrolyte and includes: subjecting borane-dimethylsulfide complex as a raw material to reaction with phenol to obtain triphenoxyboroxine, adding borane-dimethylsulfide complex into a Schlenk reaction flask, adding THF (tetrahydrofuran), mixing, adding phenol and water into the mixture, heating to allow reacting under 70-80 DEG C and 1-5 atm for 1-1.5 h, allowing reacting under 70-80 DEG C and 8-120 Pa for 30-40 min, allowing reacting under 3-5 Pa and 80-100 DEG C for 20-30 min, concentrating and drying, and cooling to room temperature to obtain triphenoxyboroxine. The synthetic method has the advantages that preparation is simple, a preparation technique is good in cleanliness and environmental friendliness, the preparation process is mild and stable, and prepared triphenoxyboroxine has high yield, high purity, low water content and low acid value.

The invention belongs to the technical field of a lithium ion battery, and particularly relates to an electrolyte applicable to a silicon carbon negative and a lithium ion battery comprising the electrolyte. The electrolyte comprises an electrolyte lithium salt, a non-aqueous organic solvent and an additive. Wherein the additive comprises a negative film formation additive, a fluorine-substitutedphenyl isocyanate compound additive with a formula I structure and a dosilane nitrogen-based compound additive. Compared with the prior art, the actual discharging capability, the cycle stability andthe high-temperature storage performance of a silicon carbon negative electrode lithium ion battery are effectively improved by means of a synergic effect generated by combined application of variousadditives, gas generation is prevented, the problems of volume expansion and pole plate pulverization of the battery during the charge-discharge process are solved very well, and meanwhile, the electrolyte is compatible with relatively good high- and low-temperature performance.

The invention provides a synthesis method of trimethoxyboroxine. Borane methyl sulfide serves as a raw material to react with carbon dioxide, trimethoxyboroxine is obtained, borane methyl sulfide is added into a Schlenk reaction bottle at the temperature of -60 - -80 DEG C, THF (tetrahydrofuran) is added into the Schlenk reaction bottle to be mixed for 15-20 seconds under the pressure of 0.5-0.7Pa, carbon dioxide is guided into the reaction bottle, the pressure is controlled to be 90-100kPa, then heating is conducted till the temperature reaches 70-80 DEG C, it is detected that no borane methyl sulfide exists, the reaction is ended, and trimethoxyboroxine is obtained. The preparation method is simple, the preparation technology is clean and environmentally friendly, the preparation processis moderate and stable, the yield of the prepared trimethoxyboroxine is high, the purity is high, the water content is low, and the acid value is low.

The invention discloses a high-temperature-storage-resistant oil-based lithium ion battery diaphragm and anpreparation method thereof. The preparation method comprises the following steps: uniformly stirring an organic solvent and PVDF (Polyvinylidene Fluoride), adding a water removal additive, uniformly stirring, adding a high-temperature film-forming agent, uniformly stirring, adding an optimizing agent, and uniformly stirring to obtain high-temperature-storage-resistant diaphragm slurry, the organic solvent being one or a mixture of more of DMAC, DMF and acetone, the dewatering additive being alkyl phosphoric anhydride, the high-temperature film-forming agent being methylene methanedisulfonate and / or 4-methyl ethylene sulfite, and the optimizing agent being fluoroborate. The method for preparing the oil-based lithium ion battery diaphragm comprises the following steps: coating one surface of a base membrane with the high-temperature-resistant storage diaphragm slurry, extracting and drying to obtain the oil-based lithium ion battery diaphragm. The high-temperature film-forming agent and the optimizing agent supplement each other, the dynamic stability of the SEI film is promoted, and the water removal effect of acid anhydride is matched, so that the super-strong high-temperature-resistant storage performance of the lithium battery is ensured.

The invention relates to a manufacturing method of a negative electrode active material complex, a water-based lithium ion secondary battery and a manufacturing method thereof. Problem: Suppress the decomposition of the aqueous electrolyte solution during charge and discharge of the aqueous lithium ion secondary battery and increase the operating voltage of the battery. An aqueous lithium-ion secondary battery comprising a negative electrode, a positive electrode, and an aqueous electrolyte solution, wherein the negative electrode has a composite of a negative electrode active material and polytetrafluoroethylene, and the composite is confirmed to be derived from polytetrafluoroethylene by FT-IR measurement. 1150cm ‑1 near and 1210cm ‑1 Near the peak, but can not be confirmed in the Raman spectrum measurement from the 729cm of polytetrafluoroethylene ‑1 nearby peaks.

The present invention relates to a method for manufacturing a negative electrode for an aqueous lithium ion secondary battery and a method for manufacturing the aqueous lithium ion secondary battery. Disclosed is a method for producing a negative electrode capable of suppressing decomposition of an aqueous electrolyte when applied to an aqueous lithium ion secondary battery. A method for producing a negative electrode for an aqueous lithium ion secondary battery, comprising a first step of forming a film on the surface of the negative electrode by contacting the negative electrode electrochemically maintained in a reduced state or an oxidized state with a non-aqueous electrolytic solution in which a lithium salt is dissolved , and a second step of washing the above-mentioned negative electrode on which the above-mentioned film is formed on the surface.

The invention discloses a lithium titanate composite anode material and a preparation method thereof. A coating layer coats the outside of the lithium titanate material; and the coating layer is a mixture of LiAlO2 and SiOx. The LiAlO2 on the surface of the anode material has ionic conductivity; the SiOx forms a solid electrolyte in the charge and discharge processes; the LiAlO2 and the SiOx are beneficial to improvement of the capacity and the rate capability of the anode material; the composite LiAlO2 / SiOx coating layer on the surface covers surface-active sites of the lithium titanate material; and reductive decomposition of the electrolyte is inhibited, so that a gas generated when the composite anode material is used as the anode material for a lithium-ion battery is reduced; and the service lifetime is effectively prolonged. The method is an effective path which can improve the capacity and the rate capability of the lithium titanate composite anode material, can prolong the cycle lifetime and can inhibit gas production of the lithium titanate composite anode material; and the method is friendly to environment, simple in process, low in cost and suitable for large-scale production, and has a wide market prospect.