36results about How to "Good lithium ion transport performance" patented technology

The invention relates to a lithium ion solid electrolyte and a preparation method application thereof, and belongs to the technical field of a lithium ion battery. The lithium ion solid electrolyte has the chemical formula shown as follows: Li<3+a>M

A<m>B<n>Y<1-b>, wherein a is more than or equal to -0.25 but less than or equal to 0.25, b is more than or equal to 0 but less than or equal to 0.5, m is more than or equal to 0 but less than or equal to 1.25, n is more than or equal to 0 but less than or equal to 1.25, M is one of Ca, Ba, Mg, Al and Ti, A and B are separately selected from one of O, S, Se, Te, N, P, Si, C, Sb, Bi, F, Cl, Br and I, and Y is one of halogen, minus monovalent ionic group or vacancy. The lithium ion solid electrolyte has a stable structure and favorable lithium ion transmission performance and has favorable electrochemical performance and safety performance when used as a solid electrolyte of the lithium ion battery.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to an inorganic and organic composite multihole diaphragm. The diaphragm comprises a multihole diaphragm base material and an active coating layer attached to at least one surface of the multihole diaphragm base material, wherein the active coating layer comprises inorganic particles, vinylidene fluoride and hexafluoropropylene copolymer, cellulose based polymer with the molecular weight of 100,000 to 1,000,000 and at least one of polyacrylic acid and polyacrylate. Compared with the prior art, the diaphragm keeps relatively high air permeability and lithium ion transmission capacity; the active coating layer and the multihole diaphragm base material are well bonded; and the overheating contraction performance and the puncture strength of a diaphragm base can be improved remarkably. Furthermore, the invention also discloses a preparation method for the diaphragm and a lithium ion battery with the diaphragm.

The invention relates to double-type antiperovskite lithium-ion solid electrolyte as well as a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The lithium-ion solid electrolyte disclosed by the invention has the chemical formula shown as follows: Li[3+a]MpAmBn(XxYy)[1-b], wherein a is greater than or equal to -0.25 and less than or equal to 0.25; b is greater than or equal to 0 and less than or equal to 0.5; p is greater than or equal to 0 and less than or equal to 0.5; m is greater than 0 and less than or equal to 1.25; n is greater than 0 and less than or equal to 1.25; x is greater than or equal to 0 and less than or equal to 1; y is greater than or equal to 0 and less than or equal to 1; M is any one of Ca, Ba, Mg, Al and Ti; A and B is any two of O, S, Se, Te, N, P, Si, C, Sb, Bi, F, Cl, Br and I; X and Y are separately selected from one of halogen or a negative univalent ionic group or vacancy. The structure of the lithium-ion solid electrolyte disclosed by the invention is a double-type antiperovskite structure, is stable in structure and has a good lithium-ion transmission property.

The invention discloses a lithium ion battery anode material and a manufacturing method of the lithium ion battery anode material. The anode material is cobalt nickel oxide manganese with a layer structure and has the chemical composition of LiNil-x-yCoxMnyO2, wherein x is equal to and larger than 0.15 and is equal to and less than 0.3, and y is equal to and larger than 0.2 and is equal to and less than 0.4. The manufacturing method provided by the invention has the following steps: the cobalt nickel oxide manganese powder is manufactured through a coprecipitation method, metal phosphate is adopted as a cladding material with the cladding quantity as 0.5-1.5% of the anode material; and the cobalt nickel oxide manganese is externally cladded by zinc phosphate through fluidization. The cladded battery material after modification with the manufacturing method has high special capacity and has good cycling stability at high temperature.

The invention discloses a silicon-based composite anode material for a lithium ion battery and a preparation method thereof. The anode material comprises a graphite skeleton and an amorphous carbon layer which coats the graphite skeleton. The graphite skeleton is filled with a silicon material coated with a carbon-containing structure. The silicon material and the graphite skeleton are combined through a loose carbon material. The preparation method at least comprises the following steps: (1) preparing the silicon material coated with the carbon-containing structure; (2) preparing spherical particles with graphite as the main body; (3) coating the spherical particles with the amorphous carbon layer; and (4) granulating. According to the invention, the electric insulation problem of silicon anode due to its volume change can be solved, and it can be guaranteed that silicon active component can always be electrically contacted with a current collector during the charge-discharge cycle process. Meanwhile, huge stress effect caused by volume expansion/shrinkage of the active material silicon is further buffered. Then, the composite material has characteristics of high electrochemical cycle stability and regulable specific capacity.

The invention relates to a cathode material for a lithium-sulfur battery and preparation and an application of the cathode material. The cathode material comprises elemental sulfur particles and metal sulfides, wherein one or more than two metal sulfides coat the surfaces of the elemental sulfur particles; and the metal of the metal sulfides is one or more than two of Zn, Fe, Cd, Pb, Cu or Ag. The metal sulfides have semiconductor properties, so that certain electron conductivity can be provided; the metal sulfides have good lithium ion transmission capabilities; lithium ion transmission in a tight coating condition is ensured; coating of the metal sulfides on the elemental sulfur surface can be achieved in a mild chemical environment; and the method is simple and feasible.

The invention belongs to the technical field of batteries, and particularly discloses a preparation method of an all-solid-state lithium air battery cathode with a flexible characteristic. Through reasonable design of the positive electrode structure and introduction of the polymer electrolyte as a lithium ion transmission skeleton, the cathode with high lithium ion transmission capability, high electronic conductivity and rich pore structures is prepared, so that the performance of the solid-state lithium air battery is improved. The prepared cathode has a flexible characteristic and can be applied to a flexible solid-state lithium-air battery. The invention provides a new way for efficient and controllable preparation of the cathode of the all-solid-state lithium-air battery, and has a wide application prospect.

The invention discloses a high-voltage-resistant composite solid electrolyte, a preparation method of the high-voltage-resistant composite solid electrolyte and an all-solid-state lithium battery, and relates to the technical field of lithium ion batteries, and the high-voltage-resistant composite solid electrolyte is formed by hot pressing of a first composite solid electrolyte layer and a second composite solid electrolyte layer; the first composite solid electrolyte layer comprises a COFs matrix and a polymer electrolyte A loaded on the surface of the COFs matrix, and the polymer electrolyte A comprises polyoxyethylene, bismuth trioxide, a lithium salt and polyvinylidene fluoride; the second composite solid electrolytic layer comprises a COFs matrix and a polymer electrolyte B loaded on the surface of the COFs matrix; and the polymer electrolyte B comprises polymethyl methacrylate, bismuth trioxide, lithium salt and polyvinylidene fluoride. According to the composite solid electrolyte, the electrochemical window of the solid electrolyte is widened, the interface resistance is reduced, the interface stability of the positive electrode and the negative electrode and the lithium ion transmission performance are improved, the composite solid electrolyte can be simultaneously suitable for a lithium metal negative electrode and a high-voltage ternary positive electrode, and the cycle performance of a battery is improved.

The invention provides a lithium metal alloy and a preparation method and an application thereof. The method comprises steps that alkali metal salt solid is extracted from lithium ore lixivium or purified lithium brine; the alkali metal salt solid is heated under inert gas till the alkali metal salt solid is completely melted; the melted alkali metal salt solid is melt-electrolyzed under inert gas for 1-10 hours to obtain the metal lithium alloy. The method is advantaged in that the method is simple in process, easy to operate and can realize comprehensive utilization of resources. The prepared lithium alloy has good electrochemical stability, excellent lithium ion transport capacity and mechanical properties and can be applied to metal lithium batteries to improve coulombic efficiency, specific capacity and cycle stability of the batteries.

The invention relates to a metal thio compound @ S composite material and preparation and application thereof in a lithium-sulfur battery. The material is characterized in that the metal thio compound@ S composite material comprises a core and a coating material for coating the core; the core is made of elemental sulfur; the coating material is at least one metal thio compound with a right figurestructural formula, wherein R is alkyl, tertiary amino or ether, M is a metal element of Li, Zn, Cu, Cd, Ca, Bi, Pb, Ni, Sn, Fe, Co or Ag, and n is the chemical value of M. The organic metal thio compound has good lithium ion transmission capacity. Lithium ion transmission under the tight coating condition is guaranteed, and certain electronic conductivity can be provided. Compared with the existing inorganic coating layer, the coating layer provided by the invention is more elastic, and can relieve the cracking and falling of the coating layer caused by the volume change in the charging anddischarging process of elemental sulfur. The organic metal thio compound can provide a certain capacity.

The invention discloses a preparation method of a carbon quantum dot modified NCM ternary positive electrode material, and relates to the technical field of ternary positive electrode materials, and the preparation method comprises the following steps: (1) coating an intermediate layer; (2) coating TiO2 doped with carbon quantum dots; (3) carrying out alkaline etching. The invention has the beneficial effects that the NCM is used as an inner core of the material, the TiO2 is used as a shell of the material, a cavity structure is formed in the middle, and the TiO2 is doped into the carbon quantum dots while protecting and supporting the inner core of the NCM, so that the conductivity of the material is enhanced. Therefore, the stability and the rate capability of the material are improved in two aspects.

The invention discloses a graphene nano-ribbon-based lithium iron phosphate composite material and a preparation method and an application thereof. The preparation method comprises steps that the graphene oxide nanoribbon, the ferric compound, a lithium source, a phosphorus source, a carbon source and the solvent are uniformly mixed and dried to obtain precursor powder; the precursor powder is sintered at the high temperature in the protective atmosphere, and the graphene nano-ribbon-based lithium iron phosphate composite material is obtained. The method is advantaged in that the process is simple, the graphene nanoribbon is utilized together with the amorphous carbon as a reducing agent to convert ferric iron into divalent iron, the formation of impurities can be reduced, the short time is taken, the method is safe, environmentally friendly and non-toxic, the graphene nano nanoribbon and the amorphous carbon are utilized to composite a conductive carbon shell, electronic conductivitycan be improved without hindering insertion and extraction of lithium ions, and the obtained graphene nano-ribbon-based lithium iron phosphate composite material has high specific capacity, superior electrical conductivity and electrochemical performance and good rate performance and has a wide range of applications in the battery field.

The invention relates to a composite solid electrolyte as well as a preparation method and application thereof. The composite solid electrolyte comprises the following components: polyoxyethylene, a lithium salt, a plasticizer and a 2D flaky inorganic substance, wherein the 2D flaky inorganic substance is an MXene-AlOOH compound. The composite solid electrolyte is high in conductivity, good in electrode and electrolyte interface compatibility and excellent in mechanical property, and the formed lithium ion battery has excellent lithium ion transmission performance and cycling stability.

The invention discloses an animal glue binder for a cathode of a lithium-sulfur battery and a preparation method of the animal glue binder. The animal glue binder for the cathode of the lithium-sulfur battery is formed by compounding and modifying animal glue by 3-sulfo-alanine and dopamine hydrochloride. The novel composite binder of the lithium-sulfur battery is prepared from natural biopolymer animal glue to replace polyvinylidene chloride as a traditional binder, and amino and carboxyl in animal glue molecules are respectively subjected to amidation reaction with carboxyl in 3-sulfo-alanine molecules and amino in dopamine hydrochloride molecules; the cathode active material can be fixed by a-SO3H group in the 3-sulfo-alanine molecule through a substitution reaction, so that the utilization rate of the sulfur active material is increased; and catecholamine groups in dopamine hydrochloride can more firmly protect the structural integrity of the sulfur cathode. The animal glue composite modified binder not only can be used as a binder, but also can be used as a strong dispersant of a cathode material, and the binder is simple to prepare and synthesize, and has good electrochemical stability and longer cycle life.