42results about How to "Excellent lithium ion conductivity" 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 secondary batteries and discloses a positive electrode sheet preparation method and a lithium ion secondary battery with a positive electrode sheet. Prepared positive electrode sheet paste contains an additive in a molecular formula (1), and the additive can be phosphorous acid or phosphite ester. By adding of the appropriate quantity of phosphorous acid and/or phosphite ester into the positive electrode sheet paste, the problem of powder shedding of the positive electrode sheet can be improved, adhesiveness between a positive electrode sheet coating and an aluminum foil is improved, a positive electrode material particle coating effect is achieved, and accordingly battery gas-producing expansion is remarkably inhibited while batterycycle stability is improved.

The invention is applicable to the technical field of lithium batteries, and provides a high-energy density type lithium cobaltate cathode material and a preparation method thereof. According to the high-energy density type lithium cobaltate cathode material and the preparation method thereof, doped type primary lithium cobaltate particles are generated by performing solid phase reaction on a cobalt source which is pre-doped with Ni element, an additive and a lithium source, and then the surfaces of the doped type primary lithium cobaltate particles are coated with a doped N element-containingLiVPO4F material which is stable under high voltage, wherein the cobalt source is pre-doped with Ni, so that the Ni element can be distributed more uniformly in a substrate, and a material structureis more stable in a charging-discharging cyclic process; meanwhile, the substrate is added with an M element, so that the effect of stabilizing the material structure is further achieved. The LiVPO4Fmaterial has the advantages of stable structure, high voltage platform and the like; the lithium ion conductivity of the LiVPO4F material can be further improved through doping. The lithium cobaltatecathode material provided by the invention can be normally used under the max charge voltage of 4.50 V, and has excellent cycle performance and safety performance.

The invention provides an organic-inorganic composite coating film on the surface of a metal lithium negative electrode. The film comprises a siloxane organic phase formed by condensation of LiSixOy inorganic particles and silane; and the film uniformly coats the surface of metal lithium, and has the characteristics of relatively high ionic conductivity, high young modulus, small interface resistance, improved long-term working stability of the metal lithium, and the like. Meanwhile, the invention also provides a preparation method of the organic-inorganic composite coating film on the surface of the metal lithium negative electrode. The silane which is distributed on the surface of the metal lithium is subjected to adaptive phase splitting along with a first-time deposition process of the lithium to form an organic-inorganic composite double-phase structure, and the metal lithium is guided to be uniformly deposited and stripped in a charging process, so that the growth of lithium dendrites is inhibited. The cycle lives of the metal lithium negative electrode and a battery system are remarkably prolonged, and the safety of the metal lithium negative electrode and the battery system during use is guaranteed.

The invention discloses an electrode plate as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing an electrode material plate: stirring an electrode material, a conductive agent, an adhesive, a dispersing agent and a pore-forming agent to obtain slurry, coating the surface of a current collector with the slurry, and conducting drying to obtain the electrode material plate; preparing an electrolyte solution: performing mechanical ball milling on the solid electrolyte to obtain electrolyte powder, and dissolving the electrolyte powder in an organic solvent to obtain the electrolyte solution; preparing the electrode plate:soaking the electrode material plate in the electrolyte solution, then conducting heating, drying and tabletting under the vacuum condition to obtain the electrode plate. The electrode plate of the solid-state lithium ion battery is prepared through the preparation method. The prepared electrode plate is applied to any one of a traditional liquid lithium battery, a polymer lithium battery, a mixed solid-liquid electrolyte lithium storage battery and a solid-state battery. The preparation method has theadvantages that the preparation process is low in cost, large-scale production is easy, and the prepared electrode plate has excellent electrochemical performance.

The invention discloses a surface coating modification method of a LiNi0.5Mn1.5O4 cathode material. The method comprises steps as follows: firstly, lithium-titanium dioxide-coated LiNi0.5Mn1.5O4 is prepared, then ammonium dihydrogen phosphate is added, and lithium-titanium dioxide-ammonium dihydrogen phosphate composite-coated LiNi0.5Mn1.5O4 is obtained through a reaction; finally, LiNi0.5Mn1.5O4 is heated to 650-750 DEG C in an air atmosphere, then cooled to 400-600 DEG C for secondary heat treatment and cooled to the room temperature, and then a cathode material product is obtained. According to the method, the surface of the electrode material is coated with a fast ion conductor, namely, LiTi2(PO4)3, an artificial solid electrolyte layer is formed, corrosion caused by an electrolyte to the electrode material is effectively inhibited, the cycling stability of the material is improved, besides, the fast ion conductor has the good lithium ionic conductivity, and the cycling performance of the electrode material under the conditions of high-rate charging and discharging is improved.

The invention belongs to the technical field of battery negative electrode materials, and provides a phenyl organic acid compound modified graphite negative electrode material, the negative electrodematerial comprises a phenyl organic acid compound and graphite, and the weight ratio of the phenyl organic acid compound to the graphite is 1-6: 100; according to the structural general formula of thephenyl organic acid compound, RA1 is a hydrocarbyl organic acid group containing a carbon-carbon single bond, a carbon-carbon double bond or a carbon-carbon triple bond, and the organic acid group isone or two of sulfonic acid, phosphonic acid, boric acid and carboxylic acid. The invention also provides a preparation method of the negative electrode material. According to the preparation method,the first coulombic efficiency of the graphite negative electrode is remarkably improved, the lithium consumption caused by rupture and reforming of a SEI membrane in the long-term cycle process of the battery is greatly reduced, and the long-term cycle stability and the high-temperature cycle stability of the battery are remarkably improved.

The invention discloses a lithium molybdate surface modified lithium ion battery nickel-rich positive pole material and a preparation method thereof. The chemical formula of the lithium ion battery nickel-rich material is LiNiaCobM1-a-bO2, wherein a and b are the mole number, a is larger than or equal to 0.5 and is smaller than or equal to 1, b is larger than or equal to 0 and is smaller than or equal to 0.2, M is one or more of Mn, Al and Fe, Li2MoOx is surface modified layer material lithium molybdate, and x is larger than or equal to 3 and is smaller than or equal to 4. The lithium molybdate surface modified lithium ion battery nickel-rich positive pole material is prepared through simple liquid phase precursor preparation, surface modification and high-temperature solid phase sintering reaction. The lithium molybdate surface modification layer has the good lithium ionic conductivity, and is beneficial to lithium ion de-intercalation. By means of the lithium molybdate surface modified lithium ion battery nickel-rich positive pole material, the rate capability, cycle performance and safety of the nickel-rich positive pole material can be greatly improved; according to the preparation method, raw materials are easy to obtain, operation is easy, the cost is low, and industrial large-scale production is easy to achieve.

The present invention relates to a gel polymer electrolyte composition, and a gel polymer electrolyte produced therefrom. Specifically, provided is a gel polymer electrolyte composition comprising: lithium salt; an organic solvent; polymer A expressed by the chemical formula 1 and comprising an epoxy group; and polymer B expressed by the chemical formula 2 and comprising amine and cyanide groups,wherein polymers A and B are contained at 1-20 wt% with respect to the total weight of the gel polymer electrolyte composition, and thus a gel polymer electrolyte for a secondary battery can be produced comprising a polymer network which is formed by three-dimensional bonding of polymer A, expressed by the chemical formula 1 and comprising an epoxy group, and polymer B, expressed by the chemical formula 2 and comprising amine and cyanide groups.

The invention discloses a Si@C composite anode material and a preparation method thereof and particularly relates to the field of anode materials of lithium ion batteries. The Si@C composite anode material is characterized by consisting of a core, a middle layer and an outer layer and adopting a core-shell structure; the core is a porous spherical Si@C material, the middle layer is a lithium metaaluminate mixed material, and the outer layer is a carbon layer; the lithium metaaluminate mixed material is formed by mixing lithium metaaluminate, graphene, a binder and a solvent; the binder is polyvinylidene fluoride and the solvent is N-methylpyrrolidone. The Si@C composite anode material solves the problems of high expansion rate, poor electrical conductivity and the like of existing Si@C composite anode materials and has the advantages of high gram volume, good cycle performance and excellent rate performance.

The invention belongs to the field of lithium ion battery material preparation, and particularly relates to a lithium-rich ternary composite material and a preparation method thereof. The preparation method comprises the steps of firstly preparing lithium powder externally coated with a polymer, then adding the lithium powder into a ternary material, uniformly mixing the lithium powder and the ternary material, soaking in a lithium metaaluminate solution, and drying to prepare the ternary composite material with a core-shell structure. The prepared material utilizes the lithium powder coated with the ternary material for providing sufficient lithium ions during a charge-discharge process, so that the first-time efficiency and the rate capability thereof are improved; meanwhile, the lithium-ion transmission rate under the high-rate condition is improved by depending on the lithium ions in the lithium metaaluminate solution on the outermost layer; meanwhile, an outer shell layer has better compatibility with an electrolyte solution, so that the cycle performance is improved.

The invention discloses a battery electrolyte, a preparation method and a silicon negative electrode battery containing the electrolyte, wherein the electrolyte comprises a lithium salt, an organic solvent and a functional additive, wherein the functional additive is vinyl fluorocarbonate and 4-Methyl chloride-1, 3, 2-Dioxathiolane-2-Oxide. The invention adds functional additives vinyl fluorocarbonate and 4-Methyl chloride-1, 3, 2-Dioxathiolane-2-Oxides can form thinner and more stable solid electrolyte phase interface on the surface of silicon anode through electrochemical process or chemicalprocess. The combination of the two additives can improve the lithium ion conductivity of SEI film and improve the cycle performance and rate performance of the battery, especially the low temperature performance of the battery.

The invention discloses a crystalline Li3OCl inorganic lithium ion conductor as well as a preparation method and an application thereof. The Li3OCl inorganic lithium ion conductor is Zn-doped Li3OCl,and the preparation method comprises the following steps: uniformly mixing lithium hydroxide, lithium oxide and lithium chloride in proportion, and melting above the eutectic point of lithium hydroxide, lithium oxide and lithium chloride to obtain a precursor; and mixing the precursor with metal zinc powder, and carrying out heat treatment at a temperature higher than the melting temperature of the precursor in a protective atmosphere to obtain the product Zn-doped Li3OCl. The Li3OCl inorganic lithium ion conductor provided by the invention has excellent lithium ion conductivity and environmental stability. The preparation method provided by the invention is short in preparation period, low in cost, high in process controllability and suitable for industrial application.

The invention provides a solid-state ion conductor and lithium-enrich manganese-based material composite electrode. The solid-state ion conductor and lithium-enrich manganese-based material compositeelectrode comprises a lithium-enrich manganese-based material and a solid-state ion conductor, and the chemical formula of the lithium-enrich manganese-based material is xLi2MnO3.(1-x)LiMO2, wherein xis greater than 0 and less than 1, and M is one or more of Mn, Ni and Co; and the chemical formula of the solid-state ion conductor is Li<1+a>[AB<2-c>(DO4)3] or Li<2+alpha>E<beta>G<3+gamma>. The invention further provides a lithium ion battery comprising the composite electrode. The solid-state ion conductor has excellent ionic conductivity and is composited in the lithium-enrich manganese-based electrode, and the lithium ion transmission rate of the electrode can be increased. In the battery charging and discharging processes, the solid-state ion conductor participates in the forming process of a solid electrolyte membrane on the surface of the lithium-enrich manganese-based material, the membrane impedance of the lithium-enrich manganese-based positive electrode is lowered, and thusthe rate performance and cycling stability of the lithium-enrich manganese-based electrode are improved.