20 results about "Lithium tungstate" patented technology

This invention relates to a polymer-based composite solid-state electrolyte, its preparation method, and a lithium solid-state battery. By weight, the polymer-based composite solid-state electrolyte comprises 5-15 parts of polymer, 5-15 parts of lithium salt, and 0.5-2.5 parts of composite filler; the composite filler includes barium titanate, with lithium tungstate coated on its surface. The polymer-based composite solid-state electrolyte of this invention exhibits high ionic conductivity and electrochemical stability, with an ionic conductivity as high as 2.86 mS / cm and an electrochemical stability window of 5.4 V. Simultaneously, the interface between the polymer-based composite solid-state electrolyte and the electrode is more stable, resulting in excellent cycle performance.

The application relates to the technical field of battery diaphragm, and discloses a lithium ion battery diaphragm with high viscosity and high safety, which is prepared from the following components in parts by weight: 15-20 parts of polyolefin, 80-85 parts of pore-forming agent and 2-4 parts of filler; the viscosity average molecular weight of the polyolefin is 1-4 million; the raw material of the filler comprises component A and component B in a mass ratio of 1:19-19:1; the component A comprises barium stearate; and the component B comprises one or more of lithium molybdate, lithium tungstate and lithium tantalate. Through the technical scheme, the problem of low strength of the lithium battery diaphragm in the related art is solved.

The invention discloses an iron-based composite lithium supplementing material which comprises a lithium-rich lithium ferrite matrix and a coating layer coating the lithium-rich lithium ferrite matrix, the coating layer sequentially comprises a first coating layer, a second coating layer and a third coating layer from inside to outside, the first coating layer is made of carbon, the second coating layer is made of carbon, and the third coating layer is made of carbon. The second coating layer comprises one or more of lithium borate, lithium tungstate and lithium silicate, and the third coating layer is carbon. The invention also provides a preparation method of the iron-based composite lithium supplementing material. According to the iron-based composite lithium supplementing material and the preparation method thereof, a fluorine-doped three-stage coating structure is adopted, the characteristic of high lithium supplementing capacity of lithium-rich lithium ferrite is fully played, the defects of poor intrinsic conductivity, high residual lithium, serious gas production, circulation deterioration and the like of the lithium-rich lithium ferrite are overcome, lower metal dissolution and lower gas production are realized, and the lithium supplementing capacity of the lithium-rich lithium ferrite is improved. And the capacity and the long-term cycle retention rate of the battery are further ensured.

This invention belongs to the field of cathode materials, and provides a ternary cathode material, its preparation method, and a battery. The tungsten content of the ternary cathode material provided by this invention gradually decreases along a direction perpendicular to the surface of the ternary cathode material towards the interior, and the tungsten element in the ternary cathode material is mainly distributed within a depth range of 100 nm. The tungsten element material on the outer surface of the ternary active material includes tungsten oxide and lithium tungstate. The formed lithium tungstate consumes the residual lithium on the surface of the ternary active material, reducing the residual lithium content on the surface of the ternary cathode material. In the preparation method of the ternary cathode material provided by this invention, tungsten chloride with a low melting point is deposited on the surface of the ternary active material, and then the tungsten chloride is oxidized to tungsten oxide using an oxidation reaction to obtain the ternary cathode material. This reduces heat consumption while ensuring that the tungsten element is uniformly distributed on the surface of the ternary cathode material, thereby obtaining a ternary cathode material with high compressive strength, low surface residual lithium content, and good cycle performance.

The invention provides an electrolyte additive for a lithium metal battery, and a design and preparation method of an electrolyte. The invention provides an application of mesoporous polydopamine and lithium phosphotungstate as additives in a lithium metal battery electrolyte. The electrolyte comprises mesoporous polydopamine, lithium phosphotungstate, a lithium salt and an ether-based solvent. And preparing the Li3PW12O40 nano particles by adopting an ion exchange method. Through chemical adhesion and physical adsorption effects, Li3PW12O40 nanoparticles are supported by mesoporous polydopamine microspheres, and the mesoporous polydopamine microspheres are used as a composite additive of a lithium metal battery. The additive can be adsorbed on the interface of the battery, regulate and control the deposition of metal lithium, improve the components of an SEI film, reduce the transmission energy barrier of lithium ions and meet the quick charge requirement of the lithium metal battery. The electrolyte containing the additive can significantly improve the cycle performance and coulombic efficiency of the lithium metal total battery, and provides a feasible thought for performance improvement and product iteration of the lithium metal battery.

The invention relates to a secondary battery, the secondary battery comprises a positive pole piece, the positive pole piece comprises a positive current collector and a positive film layer arranged on at least one surface of the positive current collector, the positive film layer comprises a positive active material, the positive active material comprises an inner core and a coating layer arranged on the surface of the inner core, the inner core is a ternary material; wherein the coating layer comprises lithium tungstate and lithium borate. The positive electrode active material comprises the coating layer, so that the surface lithium residue degree is reduced, and the cycle performance of the corresponding battery is improved.

The invention discloses a ternary positive electrode material precisely coated with a bifunctional material and a preparation method of the ternary positive electrode material, and belongs to the field of lithium ion batteries. The preparation method comprises the following steps: step 1) adopting a sol-gel method to obtain LiAl (WO4) 2 powder; and 2) uniformly dispersing LiAl (WO4) 2 powder, Co (OH) 2 and the ternary positive electrode material Lix (NiaCobMnc) O2 to obtain a mixture, and sintering the mixture to obtain the ternary positive electrode material accurately coated with the bifunctional material, and 3) crushing the ternary positive electrode material precisely coated with the bifunctional material to obtain the ternary positive electrode material. According to the invention, lithium aluminum tungstate is coated at a relatively low temperature during one-time sintering, and cobaltous hydroxide is coated at a relatively high temperature, so that the cycling stability and safety of the ternary positive electrode material under high voltage can be improved, and meanwhile, the ionic conductivity of the ternary positive electrode material can be improved, so that the charge-discharge performance of the battery is improved.

The invention relates to a polymer-based composite solid electrolyte, a preparation method and a lithium solid-state battery. The polymer-based composite solid electrolyte is prepared from the following components in parts by mass: 5 to 15 parts of polymer, 5 to 15 parts of lithium salt and 0.5 to 2.5 parts of composite filler, the composite filler comprises barium titanate, and the surface of the barium titanate is coated with lithium tungstate. The polymer-based composite solid electrolyte disclosed by the invention has relatively high ionic conductivity and electrochemical stability, the ionic conductivity of the polymer-based composite solid electrolyte is up to 2.86 mS / cm, and an electrochemical stability window is up to 5.4 V. Meanwhile, the interface between the polymer-based composite solid electrolyte and the electrode is more stable, and the cycle performance is excellent.

The present disclosure provides a modified lithium iron phosphate, a preparation method thereof, and an application thereof. The preparation method includes the following steps: (1) mixing a zirconium salt, a tungstate, and a solvent to obtain a mixed salt solution, adjusting the pH, adding lithium iron phosphate, and performing a heating reaction; (2) after solid-liquid separation of the slurry obtained from the heating reaction, performing a one-step sintering treatment on the obtained solid to obtain a first-sintered material; (3) mixing an organic carbon source, a lithium source, and the first-sintered material, and performing a two-step sintering treatment to obtain the modified lithium iron phosphate. The present disclosure uses a material with a negative thermal expansion effect as a layer of coating, and then performs a conductive substance coating. During the secondary coating process, pores appear due to the negative thermal expansion effect, which is beneficial to the embedding of organic substances, improves the binding tightness between the double-layer coatings, and the pores generated during the negative thermal expansion process are beneficial to the entry of lithium ions, and can make tungsten oxide and zirconium oxide generated by decomposition better generate lithium tungstate and lithium zirconate.

The invention provides a lithium nickel cobalt aluminate positive electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: mixing and sintering a lithium nickel cobalt aluminate primary sintering material and a cobalt source to obtain a secondary sintering material; and mixing and sintering a tungsten source, a lithium source and the secondary sintering material to obtain the nickel cobalt lithium aluminate positive electrode material. According to the preparation method disclosed by the invention, a fast ion conductor layer is formed by firstly coating a cobalt source and then coating a tungsten source and a lithium source, and meanwhile, the cobalt source and the lithium source in secondary coating form a lithium cobalt oxide coating layer, so that a surface layered structure of the positive electrode material is reconstructed, and a lithium cobalt oxide coating layer and a lithium tungstate coating layer are generated on the surface of nickel cobalt lithium aluminate; the interface characteristic of the positive electrode material is improved, and the cycle performance of the material is improved while the discharge capacity is improved.

The present application relates to a positive electrode active material, which is characterized by comprising a core and a coating layer provided on the surface of the core, wherein the core is a ternary material; and the coating layer comprises lithium tungstate and lithium borate. The positive electrode active material contains the coating layer, which reduces the degree of residual lithium on its surface, thereby improving the cycle performance of the corresponding battery.

This invention provides a method for estimating the amount of coating present on the surface of a positive electrode active material. [Solution] An estimation method comprising: obtaining the lithium content (Li) and the content of metals other than lithium in the positive electrode active material (Me) in the battery, assuming that the lithium content derived from the positive electrode active material is 1 mole, and calculating the ratio of Li to Me; obtaining the amount of Ni and Li mixed in the positive electrode active material and calculating the molar ratio of the mixing amounts; obtaining the lithium carbonate content and calculating the molar ratio of lithium derived from lithium carbonate; obtaining the lithium hydroxide content and calculating the molar ratio of lithium derived from lithium hydroxide; and calculating the molar ratio of lithium derived from lithium tungstate using the following formula (1). [Li / Me]-(1-[Ni mixing])=[Li mixing]+[Li2CO3]+[LiOH]+[Lithium tungstate] Equation (1)

The invention belongs to the technical field of battery electrode materials, and particularly discloses a carbon-europium co-doped lithium tungstate coated ternary positive electrode material as well as a preparation method and application thereof. The composite material prepared by uniformly coating the surface of the ternary positive electrode material with nano carbon-europium co-doped lithium tungstate has excellent electrochemical performance, higher reversible capacity, lower internal resistance, more stable interface and more excellent cycle performance, the chemical general formula of the nano carbon-europium co-doped lithium tungstate is LixWy-mEumOz / C, x is equal to 2-6, y is equal to 1-2, z is equal to 4-9, and m is equal to 0.01-0.05. The invention also provides a preparation method of the ternary positive electrode composite material, and the preparation method has the advantages of controllable production conditions, abundant raw material sources, low energy consumption, simple preparation process and the like, and is favorable for realizing industrial production. The method is suitable for the field of preparation of lithium batteries and positive electrode materials thereof.

The present invention relates to the field of electrochemistry technology, and particularly relates to a solid electrolyte, a separator for a secondary battery, and a secondary battery. The solid electrolyte described in the present invention includes an inorganic material, and the chemical formula of the inorganic material is: Li4W 1‑x Mo x O5, where 0 < x ≤ 0.5. In the present invention, Mo is used to dope the existing Li4WO5 material, and the addition amount of Mo is strictly controlled by doping Mo into the Li4WO5 material to optimize the material composition and lattice structure of the solid electrolyte, and an inorganic material with the chemical formula Li4W 1‑x Mo x O5 is obtained. The molybdenum-doped lithium tungstate solid electrolyte has characteristics such as high conductivity, wide electrochemical window, low interfacial impedance, economic and environmental friendliness, etc., and can effectively improve the safety stability, service life of the solid battery and is environmentally friendly. At the same time, it can effectively improve the mechanical properties and anti-shrinkage properties of the composite film, improve the ability of the composite film to inhibit lithium dendrites, and also has a certain promoting effect on the high-rate discharge ability of power batteries.

The invention belongs to the technical field of chemical power sources, and particularly relates to a multifunctional modified diaphragm for a lithium-sulfur battery and a preparation method. According to the modified diaphragm for the lithium-sulfur battery and the preparation process of the modified diaphragm, an organic-inorganic composite modified layer with extremely low loading capacity is constructed on the surface of a commercial diaphragm through an ultrasonic atomization spraying method, and the modified layer is prepared from a single-ion conductor polymer Li-Nafion and polyoxometallate lithium phosphotungstate. Wherein the lithium phosphotungstate has excellent oxidation-reduction capability and can effectively catalyze the conversion of polysulfide, and the structure of the lithium phosphotungstate can effectively conduct lithium ions and effectively improve the conduction kinetics of the lithium ions. Besides, Li-Nafion is of a nonporous structure and has an electronegative functional group, so that polysulfide ions can be effectively blocked through coulomb repulsion, Li < + > can be quickly conducted through the action of the internal functional group, and Li < + > flux is increased. The diaphragm modified layer has a good effect, and the practicability of the lithium-sulfur battery can be enhanced.

The present disclosure belongs to the technical field of lithium batteries, and specifically relates to lithium tungstate, a preparation method thereof, and an application thereof. Using lithium hydroxide, a tungsten source, and an easily decomposable ammonium salt as raw materials, and taking advantage of the property that the ammonium salt is easily decomposed by heat to absorb the heat generated during the reaction process, the thermal field distribution during the reaction process can be made uniform, preventing the morphology of lithium tungstate from changing due to local overheating. Nanoscale cubic lithium tungstate can be prepared by a solid-phase reaction at room temperature. Compared with the conventional high-temperature solid-phase method, the preparation method provided by the present disclosure does not require high-temperature conditions, and the energy consumption is significantly reduced, making it suitable for large-scale industrial production.

The present application relates to the field of battery technology and provides a secondary battery and its preparation method, energy storage system and electrical equipment, which are at least beneficial to improving the cycle performance of the secondary battery. The method includes: preparing a positive electrode sheet, the preparation steps including: preparing a composite lithium supplement material including boron-doped graphene, lithium tantalate and lithium tungstate by freeze-drying; preparing boron-lithium iron phosphate by electrostatic self-assembly; mixing the composite lithium supplement material, boron-lithium iron phosphate, conductive agent and adhesive in a mass ratio of (1.5~2.2): (93.8~94.5): (0.8~1.2): (1.7~2.1) to obtain a positive electrode slurry; applying the positive electrode slurry to the surface of the positive electrode current collector and drying it to obtain a positive electrode sheet; providing a negative electrode sheet and a separator, winding the positive electrode sheet, separator and negative electrode sheet or stacking them, and then placing them in a shell, and injecting electrolyte into the shell to obtain a secondary battery.

The invention provides doped lithium tungstate as well as a preparation method and application thereof. The preparation method of the doped lithium tungstate comprises the following steps: mixing a tungsten source and a lithium source in water, adding a doping agent to obtain slurry, grinding the slurry in an ice-water bath, carrying out spray drying on the slurry to obtain powder, sintering the powder, and crushing to obtain the doped lithium tungstate LixWyMzO4. According to the technical scheme, low-energy-consumption preparation of lithium tungstate is realized, and the product has uniform nanoscale particle size distribution and controllable doped element content. According to the method, the problems of particle aggregation, high energy consumption and uneven doping in the traditional process are effectively solved, the obtained material can be used as an efficient modifier of a ternary positive electrode, and by improving the uniformity of a coating layer and the conductivity of bulk phase ions, the initial DCR of a battery is improved, and the first efficiency and the charge-discharge capacity of the battery are improved.

The invention relates to the technical field of battery diaphragms, and provides a high-viscosity and high-safety lithium ion battery diaphragm, which is prepared from the following raw materials in parts by weight: 15 to 20 parts of polyolefin, 80 to 85 parts of pore-forming agent and 2 to 4 parts of filler, the viscosity average molecular weight of the polyolefin is 1,000,000 to 4,000,000; the raw materials of the filler comprise a component A and a component B in a mass ratio of (1: 19)-(19: 1); the component A comprises barium stearate; the component B comprises one or more of lithium molybdate, lithium tungstate and lithium tantalate. According to the technical scheme, the problem that the strength of the lithium battery diaphragm in the related technology is relatively low is solved.

The invention relates to the technical field of batteries, and provides a secondary battery and a preparation method thereof, an energy storage system and electric equipment, which are at least beneficial to improving the cycle performance of the secondary battery. The method comprises the following steps: preparing a positive plate, wherein the preparation steps comprise: preparing a composite lithium supplementing material comprising boron-doped graphene, lithium tantalate and lithium tungstate by adopting a freeze-drying method; preparing boron-lithium iron phosphate by adopting an electrostatic self-assembly method; mixing the composite lithium supplementing material, boron-lithium iron phosphate, a conductive agent and an adhesive according to a mass ratio of (1.5 to 2.2): (93.8 to 94.5): (0.8 to 1.2): (1.7 to 2.1) to obtain positive electrode slurry; coating the surface of a positive current collector with the positive slurry, and drying to obtain a positive plate; and providing a negative plate and a diaphragm, carrying out winding treatment or lamination treatment on the positive plate, the diaphragm and the negative plate, putting into the shell, and injecting the electrolyte into the shell to obtain the secondary battery.