24 results about "Lithium imide" patented technology

The invention discloses a sulfur-containing all-solid-state polymer electrolyte membrane, a preparation method and a lithium metal battery, and belongs to the technical field of polymer electrolytes.The method comprises the steps that 1, 4-phenylene-diacrylate and dimethyl tetrasulfide are evenly mixed and cooled to the room temperature after a reverse vulcanization reaction, and a polymer solid is obtained; the preparation method comprises the following steps: dissolving a polymer solid in dimethyl sulfoxide, adding bis (trifluoromethanesulfonyl) lithium imide, uniformly stirring and mixing, casting in a PTFE (Polytetrafluoroethylene) mold, uniformly spreading, and carrying out vacuum drying to obtain the sulfur-containing all-solid-state polymer electrolyte membrane. The ion transmission function of a liquid electrolyte is replaced by the solid ion conduction property, and the physical isolation function of a diaphragm is replaced by a compact and firm physical structure, so that the Li < + > diffusion energy barrier is reduced, the electrochemical window is widened, the interface impedance is reduced, and the interface compatibility between the positive and negative electrode materials and the solid electrolyte is improved; the lithium metal battery assembled by the electrolyte has excellent electrochemical performance and cycle performance.

The invention provides an imine lithium compound, a preparation method thereof and application of the imine lithium compound in a battery. The structural formula of the lithium imide compound is as shown in the formula I in the specification. The preparation method of the lithium imide compound comprises the following steps: adding sulfuryl fluoride, ammonia gas and an acid-binding agent, and carrying out ammonification reaction to obtain a first intermediate; adding phosphorus trichloride into the first intermediate, and carrying out phosphating reaction to obtain a second intermediate; adding ethylene glycol into the second intermediate for substitution reaction to obtain a third intermediate; and adding a lithiation compound into the third intermediate to carry out lithiation reaction. As a new substance, the lithium imide compound contains a fluorosulfonyl imide group and a cyclic phosphate group, has the advantages of cyclic phosphate, sulfonyl imide group and fluoro group, has a good application prospect, can be applied to a secondary battery, and can also be used as an intermediate for material and medicine processing. # imgabs0 #

The invention relates to a preparation method and application of an organic coating material, in particular to a preparation method and application of a thiolated 3-chloropropanesulfonyl (trifluoromethanesulfonyl) lithium imide-triallyl phosphite organic coating material. In order to solve the problem of high reactivity of SC-NCM, a novel organic coating material, namely thiolated 3-chloropropanesulfonyl (trifluoromethanesulfonyl) lithium imide-triallyl phosphate (SH-LiCPSI-TLP), is provided by combining the influence of the type of the coating material and the form of a coating layer on the performance of the positive electrode material; as the Young modulus of an organic material is generally lower than that of an inorganic material, a uniform coating layer can be formed on the surface of the positive electrode material by adopting a simple wet coating method. An electrochemical test shows that after SH-LiCPSI-TLP is coated, the capacity diving phenomenon of the SC-NCM811 can be effectively inhibited, and under the 1C multiplying power, the capacity retention ratio is still 52.78% even if the SH-LiCPSI-TLP is circulated for 600 circles.

A lithium ion secondary battery includes, a positive electrode including a positive electrode active material, a negative electrode, and a non-aqueous electrolyte solution, wherein the non-aqueous electrolyte solution includes comprises LiPF6 and a lithium imide salt as an electrolyte, and includes a carbonate-based solvent as a solvent, the lithium ion secondary battery includes or does not include a surplus electrolyte solution, the ratio of the positive electrode capacity to the negative electrode capacity is adjusted to less than 1, the nominal voltage is adjusted to less than 3.6 V, and the total content of LiPF6 and lithium imide salt included in the non-aqueous electrolyte solution per unit battery capacity and the ratio of the positive electrode capacity to the negative electrode capacity are adjusted to satisfy a specific relationship.

An embodiment of the present invention provides a separator for a non-aqueous secondary battery, including a porous substrate; and an adhesive layer that is provided on at least one side of the porous substrate and that contains a polyvinylidene fluoride type resin, in which the separator contains a lithium imide salt.

The invention belongs to the technical field of lithium metal batteries, and particularly discloses a local high-concentration electrolyte which comprises Li < + > solvated structure raw materials, a carbonyl oxygen type hydrogen bond acceptor and an inert diluent, the Li < + > solvated structure raw materials comprise bis (trifluoromethanesulfonyl) lithium imide, and the carbonyl oxygen type hydrogen bond acceptor can be coordinated with the bis (trifluoromethanesulfonyl) lithium imide to form a deep eutectic solution. The local high-concentration electrolyte is a uniform transparent homogeneous liquid, and has high chemical stability and high ionic conductivity within the temperature range of-40 DEG C to 40 DEG C. The local high-concentration electrolyte has excellent low-temperature cycling stability and safety corresponding to the lithium metal battery, and the coulombic efficiency is basically kept at 100% after 150 cycles under the working condition of-20 DEG C.

In order to solve the problem in the prior art that lithium bis(fluorosulfonyl)imide is used in lithium battery electrolyte to corrode electrodes and deteriorate battery stability, the present invention provides a lithium bis(fluorosulfonyl)imide composition and a preparation method thereof. The preparation method comprises the steps of reacting KFSI and lithium nitrate to obtain the lithium bis(fluorosulfonyl)imide composition. The prepared lithium bis(fluorosulfonyl)imide composition contains 20ppm-1000ppm of nitrate. When the composition is used in lithium secondary battery electrolyte, a trace amount of nitrate inhibits the corrosion of lithium bis(fluorosulfonyl)imide on electrode current collectors, greatly reduces the corrosion of aluminum current collectors, improves the cycle life thereof, reduces the long-term cycle volume expansion rate of the battery, and improves the battery stability and safety performance.

An electrolyte solution for lithium ion secondary cell capable of suppressing a decomposition reaction of a graphite negative electrode by optimizing an amount of a cyclic carbonate, and capable of improving a cell performance in a low temperature range. The electrolyte solution for lithium ion secondary cell of the present invention includes; 10 volume % to 20 volume % of ethylene carbonate (EC) and / or propylene carbonate (PC) as a cyclic carbonate; 0.38 mol / L to 0.75 mol / L of at least one selected from lithium hexafluorophosphate (LiPF6), lithium tetrafluoroborate (LiBF4), or lithium bis(oxalate) borate (LiBOB) as a first lithium salt; and a lithium imide salt. A sum of the lithium imide salt and the first lithium salt is in a range of 0.5 mol / L to 1.5 mol / L, and a mole ratio of the cyclic carbonate / the first lithium salt is in a range of 3 to 5.

The invention relates to a dielectric film with PI (polyimide) for a solid-state battery. The solid-state battery comprises a positive electrode, a negative electrode and a dielectric film located between the positive electrode and the negative electrode. The dielectric film is formed by combining PVDF (Polyvinylidene Fluoride), a plurality of LLZO (Lithium-Lanthanum-Zirconium-Oxide) particles, a polyimide (PI) modifier and LiTFSI (LiN (CF3SO2) 2, bis (trifluoromethanesulfonyl) lithium imide), and is characterized in that the dielectric film is prepared from PVDF (Polyvinylidene Fluoride), a plurality of LLZO particles, a polyimide (PI) modifier and LiTFSI (LiN (CF3SO2) 2, bis (trifluoromethanesulfonyl) lithium imide; wherein the polyimide (PI) modifier is a polymer material having good heat resistance, chemical resistance and electrical insulation; the polyimide (PI) modifier is mixed with the LLZO particles, so that the surface energy of the LLZO particles can be effectively reduced, and the surface stability of the LLZO particles can be improved.

An embodiment of the present invention provides a separator for a non-aqueous secondary battery, including a porous substrate; and an adhesive layer that is provided on at least one side of the porous substrate and that contains a polyvinylidene fluoride type resin, in which the separator contains a lithium imide salt.

The invention belongs to the technical field of all-solid-state lithium battery electrolytes, and particularly relates to a solid-state lithium metal battery composite polymer electrolyte, a preparation method and application thereof and an all-solid-state battery. The preparation method comprises the following steps: mixing a polyvinylidene fluoride-hexafluoropropylene copolymer, bis (trifluoromethanesulfonyl) lithium imide, polyethylene oxide and LLZO with a solvent to obtain sol, then spreading the sol into a film, and drying to remove the solvent under a standing condition to obtain the solid-state lithium metal battery composite polymer electrolyte. The defects of an existing polymer electrolyte are overcome, and particularly the problems that an electrolyte with polyethylene oxide (PEO) as a matrix is high in crystallinity, low in ionic conductivity, serious in polarization and insufficient in mechanical strength at the room temperature are solved.

A power storage device 10 includes: an electrolyte 12 containing a lithium imide salt and an organic solvent; a container 11 filled with the electrolyte 12; a positive electrode 30 which includes a compound containing lithium atoms that are ionized in the electrolyte 12 and that are involved in charge and discharge; a negative electrode 20 which is arranged in the electrolyte, includes a metal substrate 23 constituting a collector 21, and is configured so that a layer where the lithium atoms are deposited is formed on the surface of the negative electrode during charging; and a separator 15 which has electric insulation properties, divides the inside of the container 11 into a first electrode chamber 16 where the negative electrode is disposed and a second electrode chamber 17 where the positive electrode 30 is disposed, and transmits lithium ions moving between the first electrode chamber 16 and the second electrode chamber 17.

The invention relates to a manufacturing method of a dielectric film with a mixed slurry layer of PI for solid and solid-like batteries, and the manufacturing method of the dielectric film comprises the following steps: A, taking a plurality of LLZO particles and a solvent, and mixing the LLZO particles and the solvent to form a first slurry; step B, taking PVDF (Polyvinylidene Fluoride), a polyimide (PI) modifier, AIBN (Azobisisobutyronitrile), LiTFSI (LiN (CF3SO2) 2 and bis (trifluoromethanesulfonyl) lithium imide); the four compounds are mixed to form second slurry; c, adding the second slurry into the first slurry, and mixing to form viscous mixed slurry; and step D, coating one side of a PE (Poly Ethylene) layer with the viscous mixed slurry by using a coating machine to form the mixed slurry layer, and baking the PE layer coated with the mixed slurry layer, and at the moment, the mixed slurry layer is changed into a solid dielectric film to be coated on the PE layer, so that the dielectric film with a two-layer structure is integrally formed.

To provide a technology that can improve the battery performance of a power storage device that uses lithium ions in charging and discharging.SOLUTION: A power storage device 10 includes an electrolyte solution 12 containing a lithium imide salt and an organic solvent, a container 11 filled with the electrolyte solution 12, a positive electrode 30 having a compound containing lithium atoms that ionize in the electrolyte solution 12 and participate in charging and discharging, a negative electrode 20 disposed in the electrolyte solution, having a metal substrate 23 that constitutes a current collector 21, and configured such that a layer of precipitated lithium atoms is formed on the surface during charging, and a separator 15 that is electrically insulating and divides the interior of the container 11 into a first electrode chamber 16 in which the negative electrode is disposed and a second electrode chamber 17 in which the positive electrode 30 is disposed, and that is permeable to lithium ions moving between the first electrode chamber 16 and the second electrode chamber 17.SELECTED DRAWING: Figure 1

The application belongs to the technical field of lithium batteries, and particularly relates to a non-aqueous electrolyte and a battery. The non-aqueous electrolyte comprises an additive, an electrolyte salt and an organic solvent; the additive comprises a first additive and a second additive; the first additive comprises lithium (fluorosulfonyl)(trifluoromethylsulfonyl) imide, and the second additive comprises 2-thiophene boronic acid; the mass percentage of the first additive is a%, and the mass percentage of the second additive is b% based on the mass of the non-aqueous electrolyte; the non-aqueous electrolyte satisfies 0.5 <= a / b <= 100; and 0.05 <= a <= 5, and 0.01 <= b <= 1. In the application, the first additive and the second additive are used in combination, so that the high and low temperature cycle and discharge performance of the battery can be improved, the battery can have excellent safety performance, and the high and low temperature performance and safety performance of the battery can be simultaneously considered.

The invention provides a composite lithium-rich manganese-based positive electrode material, a preparation method thereof and a lithium ion battery containing the composite lithium-rich manganese-based positive electrode material, and belongs to the field of lithium ion batteries. The composite lithium-rich manganese-based positive electrode material is of a core-shell structure, an inner core of the lithium-rich manganese-based positive electrode material is a phase structure gradient lithium-rich manganese-based positive electrode material, a coating layer of the lithium-rich manganese-based positive electrode material comprises a polymer, the polymer comprises strong negative electricity groups and-NH2 groups, and the strong negative electricity groups comprise-C = O and / or-O-C = O. The composite lithium-rich manganese-based positive electrode material prepared by the invention has excellent long cycle performance in a lithium ion battery containing sulfonyl imino lithium salt.

The invention relates to a manufacturing method of a dielectric film with PI for a solid-state battery. The solid-state battery comprises a positive electrode, a negative electrode and a dielectric film, the manufacturing method of the dielectric film comprises the following steps: step A, taking a plurality of LLZO particles and a solvent, and mixing the LLZO particles and the solvent by using a first mixer to form a first slurry; step B, taking PVDF (Polyvinylidene Fluoride), a polyimide (PI) modifier, AIBN (Azobisisobutyronitrile), LiTFSI (LiN (CF3SO2) 2 and bis (trifluoromethanesulfonyl) lithium imide); mixing the four compounds by using a second mixer to form second slurry; c, adding the second slurry into the first slurry according to a certain proportion, and mixing to form mixed slurry; and D, coating one side of the PET layer with the mixed slurry by using a coating machine to form the mixed slurry layer, and putting the mixed slurry layer into an oven for baking, and step E, taking down the dielectric film from the PET layer.

The invention provides a preparation method of high-purity lithium fluoride and bis (trifluoromethanesulfonyl) lithium imide, which comprises the following steps: S1, dissolving solid lithium carbonate in ultrapure water, introducing carbon dioxide into the ultrapure water, and fully reacting; filtering to obtain a pure lithium bicarbonate solution; s2, in a stirring state, dropwise adding water-containing hydrofluoric acid into the aqueous solution in the step S1 for reaction to obtain lithium fluoride, continuously stirring for 2-3 hours, and standing for 4-8 hours; and S3, filtering the lithium fluoride precipitate in the step S2, separating out a lithium fluoride solid, and finally drying to obtain the high-purity lithium fluoride. S4, enabling trifluoromethylsulfonyl fluoride, ammonia gas and lithium fluoride to react in an organic solvent through a stirring device, and directly filtering after the reaction is finished; and S5, distilling the filtrate under a stirring condition, and removing the organic solvent to obtain bis (trifluoromethanesulfonyl) lithium imide. According to the method, the quality of the lithium fluoride is ensured, and the bis (trifluoromethanesulfonyl) imide lithium product prepared from the lithium fluoride is high in purity and high in yield.

The invention relates to a dielectric film with a mixed slurry layer of PI for a solid-state and solid-state-like battery. The solid-state and solid-state-like battery comprises a positive electrode, a negative electrode and a dielectric film located between the positive electrode and the negative electrode. The dielectric film comprises a PE (Polyethylene) layer and a dielectric layer, wherein the PE (Polyethylene) layer is arranged on the dielectric layer; the at least one dielectric film is arranged on the side edge of the PE layer; the dielectric diaphragm is prepared from PVDF (Polyvinylidene Fluoride), a plurality of LLZO (Lithium-Lanthanum-Zirconium-Oxide) particles, a polyimide (PI) modifier and LiTFSI (LiN (CF3SO2) 2, bis (trifluoromethanesulfonyl) lithium imide) in a combined mode, and the dielectric diaphragm is prepared from the PVDF, the plurality of LLZO particles, the polyimide (PI) modifier and the LiTFSI (LiN (CF3SO2) 2, the bis (trifluoromethanesulfonyl) lithium imide. Wherein the polyimide (PI) modifier is a polymer material having good heat resistance, chemical resistance and electrical insulation; the polyimide (PI) modifier is mixed with the LLZO particles, so that the surface energy of the LLZO particles can be effectively reduced, and the surface stability of the LLZO particles can be improved.

A polymer solid electrolyte membrane, a preparation method therefor, a solid-state battery, and an electrical apparatus, belonging to the field of batteries. The preparation method comprises: mixing a zinc salt, a lithium imide salt, a polymer matrix, and an organic solvent, drying, pre-pressing and forming, and then performing hot pressing for 35-45 minutes at 10-15 MPa and a temperature of 100-120°C. The decomposition temperature of the lithium imide salt is greater than the hot-pressing temperature. The polymer matrix contains polar functional groups. The melting temperature is less than or equal to 100°C, and the glass transition temperature is less than or equal to -15°C. The lithium imide salt and the polymer matrix are jointly used as a main body, and the mass ratio of the zinc salt to the main body is (0.8-1.2):100. The prepared polymer solid electrolyte membrane has a block structure having flexible chain segments and rigid chain segments that alternate with each other, and the polymer solid electrolyte membrane can effectively improve the cycle performance of a solid-state battery.

Lithium-sulfur batteries offer theoretical energy densities approaching 2600 Wh / kg—nearly three times higher than conventional lithium-ion batteries. The present disclosure provides co-salt electrolyte compositions combining two or more lithium salts selected from lithium imide salts, lithium halide salts, and lithium oxyanion salts to achieve synergistic performance improvements unattainable with single-salt formulations. These co-salt systems deliver enhanced capacity, superior coulombic efficiency retention, extended cycle life, and reduced self-discharge, enabling lithium-sulfur batteries to meet demanding requirements of next-generation applications including electric aviation, electric vehicles, and grid-scale energy storage. The disclosed formulations address environmental concerns by enabling reduced polyfluorinated substance content while maintaining electrochemical performance. By tailoring co-salt composition in conjunction with cathode design parameters, the technology enables application-specific optimization maximizing energy density or longevity. The result is a versatile electrolyte platform bridging the gap between the theoretical promise of lithium-sulfur chemistry and practical commercial performance requirements.

The present invention discloses an ether-ester mixed electrolyte, a lithium battery, and a preparation method thereof. The electrolyte comprises the following components: a halogen lithium salt, a lithium imide salt, lithium nitrate, lithium hexafluorophosphate, a cyclic ether, a chain ether, a cyclic ester, and a chain ester. The preparation method comprises: dissolving the halogen lithium salt, the lithium nitrate, and the lithium imide salt in a mixed ether solvent composed of the cyclic ether and the chain ether to obtain an ether-containing mixture; dissolving the lithium hexafluorophosphate in a mixed ester solvent composed of the cyclic ester and the chain ester to obtain an ester-containing mixture; and mixing the ether-containing mixture and the ester-containing mixture to obtain the ether-ester mixed electrolyte. The present invention can effectively improve the poor cycle performance of high-nickel ternary lithium batteries, resulting in high-nickel ternary lithium batteries with superior performance.

A lithium ion secondary battery includes a positive electrode including a positive electrode active material, a negative electrode, and a non-aqueous electrolyte solution, wherein the non-aqueous electrolyte solution includes LiPF6 and a lithium imide salt as an electrolyte, and includes a carbonate-based solvent as a solvent, the lithium ion secondary battery includes or does not include a surplus electrolyte solution, the ratio of the positive electrode capacity to the negative electrode capacity is adjusted to less than 1, the nominal voltage is adjusted to less than 3.6 V, and the content of lithium imide salt included in the non-aqueous electrolyte solution per unit battery capacity and the ratio of the positive electrode capacity to the negative electrode capacity are adjusted to satisfy a specific relationship.

The invention discloses a low-temperature aqueous electrolyte and a preparation method and application thereof, and belongs to the technical field of aqueous electrolytes. The low-temperature aqueous electrolyte provided by the invention comprises a metal salt, an additive, water and a cosolvent, the metal salt is selected from one or more of lithium chloride, lithium nitrate, lithium perchlorate, lithium hexafluorophosphate, bis (trifluoromethanesulfonyl) lithium imide, sodium chloride, sodium hexafluorophosphate, sodium tetrafluoroborate, sodium nitrate, potassium chloride, potassium nitrate, magnesium chloride, magnesium perchlorate, zinc perchlorate and zinc chloride; the additive is calcium chloride; the cosolvent is ethylene glycol. According to the aqueous electrolyte provided by the invention, the ethylene glycol with relatively low toxicity is used as a cosolvent, so that the aqueous electrolyte has excellent low-temperature performance while reducing the concentration of the lithium salt in the aqueous electrolyte, and has the advantages of being green, environment-friendly, relatively low in price, safe and flame-retardant.