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

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 discloses high-voltage lithium ion battery electrolyte, a preparation method and application of electrolyte. The high-voltage lithium ion battery electrolyte comprises an organic solvent, conductive lithium salt and a functional additive, wherein the organic solvent is prepared from a cyclic carbonate solvent, a fluoro solvent and a linear carbonic ester solvent, the content of the fluoro solvent in the high-voltage lithium ion battery electrolyte is 0.1-40wt.%, the content of the functional additive is 0.01-5wt.%, and the concentration of the conductive lithium salt in the organic solvent is 0.8-1.5mol / L. According to the high-voltage lithium ion battery electrolyte, the interfacial property of the anode and the cathode of the battery and the electrolyte can be improved, and the stability of the electrolyte can be improved, so that the cycle life of the high-voltage lithium ion battery is prolonged, the high-temperature property of the high-voltage lithium ion battery is improved and the working voltage of the high-voltage lithium ion battery is increased to be above 4.5V.

The invention belongs to the field of batteries, and discloses a bi-imidazole ring functional ionic liquid, a preparing method thereof, an electrolyte and a lithium secondary battery. The di-imidazolering functional ionic liquid comprises divalent cations with bi-imidazole rings and ether group functional groups and two anions. The bi-imidazole ring functional ionic liquid has higher thermodynamic stability, electrochemical stability and positive and negative electrode compatibility. Moreover, the preparing method is simple, the product is high in purity and good in hydrophobicity, the thermal decomposition temperature can reach 430 DEG C, the room-temperature conductivity can reach 10<-4>S / cm, the electrochemical window can reach 5.6V vs.Li / Li+, and the safety of the lithium secondary battery can be improved. A bi-imidazole ring ionic liquid electrolyte can effectively inhibit reductive decomposition of imidazolium cations on a graphite negative electrode specially in a graphite negative electrode system, a stable SEI membrane can be formed without addition of any low-boiling-point film-forming additive, so that the battery can be stably circulated under the conditions of normaltemperature and high temperature, and has very high practical application value.

The invention discloses an electrolyte, a preparation method thereof, a high-energy-density lithium ion battery containing the electrolyte and a preparation method thereof. The electrolyte comprises alithium salt, a non-aqueous organic solvent, a negative electrode film-forming organic additive and a modified additive. The negative electrode film-forming organic additive is any one or at least two of fluoroethylene carbonate, 1, 2-difluoroethylene carbonate, chloroethylene carbonate and vinylene carbonate, and the modified additive is any one or at least two of potassium carbonate, sodium carbonate and lithium carbonate. The electrolyte provided by the invention can quickly form a layer of compact, stable and thin SEI film with good mechanical properties on the surfaces of negative electrode material particles. The high-energy-density lithium ion battery containing the electrolyte can relieve the problems of lithium battery capacity attenuation, particle pulverization and the like caused by volume expansion of a silicon-based negative electrode in the recycling process, and has good cycling stability and rate capability.

To provide: a novel nonaqueous electrolyte solution which uses a methylene bissulfonate derivative, reduces the initial irreversible capacity of a battery, and improves battery characteristics such as cycle characteristics, electric capacity and storage characteristics; a method for producing the nonaqueous electrolyte solution; and a battery which uses the electrolyte solution. The present invention relates to the following <1>-<3>. <1> A nonaqueous electrolyte solution which contains the following (1)-(3). (1) A nonaqueous solvent which contains at least one ester selected from among cyclic carbonate esters, chain carbonate esters and cyclic carboxylic acid esters. (2) A lithium salt which can be dissolved as an electrolyte salt into the nonaqueous solvent. (3) A methylene bissulfonate derivative which is represented by general formula [1]. <2> A method for producing a nonaqueous electrolyte solution, which is characterized in that a lithium salt is dissolved in a nonaqueous solvent and then the methylene bissulfonate derivative is dissolved in the nonaqueous solvent. <3> A nonaqueous electrolyte battery which comprises (i) the nonaqueous electrolyte solution set forth in <1>, (ii) a negative electrode, (iii) a positive electrode and (iv) a separator.

Disclosed is a high-voltage-resistant and flame-retardant type lithium ion battery electrolyte. The electrolyte consists of a lithium salt, an organic solvent, a film-forming additive and a flame retardant; the lithium salt is 1.5-3mol / L in concentration; the flame retardant is a fluoro phosphonitrile compound; the fluoro phosphonitrile compound has the chemical formula of N<3>P<3>F<5>OH<2>CH<3> which accounts for 5-10% of the total organic solvent based on mass percentage; and the mass of the film-forming additive is 2-4% of the that of lithium salt. The invention discloses the high-voltage-resistant and flame-retardant type lithium ion battery electrolyte and a preparation method therefor.

The invention discloses an electrolyte suitable for a silicon-carbon negative electrode and a lithium ion battery. The electrolyte comprises an electrolyte lithium salt, a non-aqueous organic solventand an additive. The additive comprises a negative electrode film-forming additive, a fluorinated phenyl boron compound and a disilyl sulfate compound. Through the synergistic effect of the fluorophenyl boron compound additive, the disilane alkyl sulfate compound additive, the negative electrode film-forming additive and the novel lithium salt type additive, the electrolyte has excellent film-forming performance on the surface of the silicon-carbon negative electrode, and the formed SEI film is relatively small in impedance and relatively stable in component and structure. By using the electrolyte, the discharge capacity, the cycling stability and the high-temperature storage performance of the silicon-carbon negative electrode lithium ion battery can be effectively improved, gas production can be inhibited, the problems of volume expansion, particle breakage and the like in the battery cycling process can be effectively solved, and meanwhile, the electrolyte has good high-temperatureand low-temperature performance.

The invention discloses electrolyte of a lithium ion secondary battery. The electrolyte comprises lithium salt, a non-aqueous organic solvent and an additive, wherein the additive at least comprises a compound reflected by the general formula (1) shown in the specification; in the general formula (1), n is an integer from 0 to 2; R1 and R2 are C1-C3 alkyl; R3 is a hydrogen atom or C1-C3 alkyl. Furthermore, the invention also discloses the lithium ion secondary battery adopting the electrolyte. The compound reflected by the general formula (1) can form a good protection film on the surface of a polar plate, and the protection film can effectively improve a negative / electrolyte interface, suppress the reductive decomposition of the electrolyte on the negative surface and also reduce the interface impedance between the polar plate and the electrolyte, so that the cycle performance and the low-temperature charging performance of the lithium ion secondary battery are improved.

The invention discloses a high-voltage lithium ion battery. The lithium ion battery comprises a positive electrode, a negative electrode, a diaphragm and an electrolyte, wherein the positive electrodeincludes a LiCoO2 active substance with the surface being coated with a modification substance, the negative electrode includes a graphite / SiO composite active substance, and the electrolyte includesan organic solvent, lithium salt and an additive. The additive in the electrolyte can form a high temperature resistant passivation film on the surface of the positive electrode, cooperate with a metal oxide on the surface of a positive electrode material to stabilize the passivation film and inhibit the oxidative decomposition of the electrolyte and the dissolution of Co ions, and also can forman SEI film on the surface of the negative electrode and slow down the occurrence of side reactions at the interface between the LiCoO2 positive electrode and the graphite / SiO negative electrode during the high-temperature storage and high-temperature cycle process, thereby improving the high-temperature storage and high-temperature cycle performance of the high-voltage lithium ion battery.

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 application of cyclic silicate compound in battery electrolyte belongs to the technical field of battery electrolyte. The cyclic silicate compound is added into battery electrolyte as additive, and the addition amount is 0.01-10%. By adding cyclic silicate compound into the electrolyte of lithium battery, the low temperature discharge characteristics and life cycle characteristics of the battery are excellent. The decomposition reaction of carbonate-based organic solvents is suppressed even if the battery is stored at a high temperature in a fully charged state or is undergoing a charge / discharge process, thereby solving the expansion problem and improving the high temperature life cycle characteristics of the battery.

Disclosed is a method for producing an anode that can suppress decomposition of an aqueous electrolyte solution when the anode is applied to an aqueous lithium ion secondary battery, the method beingfor producing an anode for an aqueous lithium ion secondary battery, the method including: a first step of touching an anode that is electrochemically kept in a reduction or oxidation state to a nonaqueous electrolyte solution in which a lithium salt is dissolved, to form a film over a surface of the anode; and a second step of cleaning the anode, over the surface of which the film is formed.

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.

The invention relates to a high-magnification spherical oxidized alloy composite electrode material. The material is an oxide alloy lithium compound doped with one or more metal ions. The surface of the oxidized alloy lithium compound is coated with a metal oxide at the same time; meanwhile, a high-conductivity carbon phase is compounded on the surface; the spherical particle is a secondary spherical particle formed by aggregating nano particles, the general chemical formula is Li < 4 > Ti < 5-x > M < x > O < 12 >. (M < y > O), through metal ion doping and compounding of a high-conductivity carbon phase, the conductivity of the oxidized alloy lithium compound at a high rate can be greatly improved; the electrochemical performance is improved, the metal oxide is coated on the surface of theoxidized alloy lithium compound by controlling the amount of metal ions in a condition process, so that the reduction decomposition of an electrolyte is effectively inhibited, the gas production is inhibited, the cycling stability of the battery is further improved, the gas expansion problem is effectively improved, and the high-rate charging cycle life is prolonged.

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 relates to an all-solid-state battery and a preparation method thereof. The all-solid-state battery comprises a positive electrode, an organic-inorganic composite electrolyte, a multifunctional intermediate layer and a negative electrode which are sequentially stacked, the preparation raw materials of the multifunctional middle layer comprise a high-molecular polymer, an ionic liquid monomer, an initiator and a solvent; the ionic liquid monomer comprises at least one unsaturated carbon-carbon double bond; and the cation of the ionic liquid monomer is selected from one or a combination of more of piperidine cation, quaternary ammonium salt cation and pyrrole cation. The all-solid-state battery is of an integrated structure, the problem that lithium intercalation and deintercalation reactions are difficult to complete due to the use of ionic liquid is solved, and the long-acting cycle stability of the all-solid-state battery is ensured.

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.

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.

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.

Disclosed is an aqueous electrolyte solution that is difficult to be reduced to be decomposed, and that can improve properties of a lithium ion secondary battery when the solution is applied to the battery. The aqueous electrolyte solution for a lithium ion secondary battery includes: water; a lithium ion; a TFSI anion; and a cation that can form an ionic liquid when the cation forms a salt alongwith the TSFI anion in an atmospheric atmosphere, the cation being at least one selected from the group consisting of an ammonium cation, a piperidinium cation, a phosphonium cation, and an imidazolium cation.

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 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.