128 results about "Li element" patented technology

A positive active material is provided which can inhibit side reactions between the positive electrode and an electrolyte even at a high potential and which, when applied to a battery, can improve charge/discharge cycle performance without impairing battery performances even in storage in a charged state. Also provided are: a process for producing the active material; a positive electrode for lithium secondary batteries which employs the active material; and a lithium secondary battery which has improved charge/discharge cycle performance while retaining intact battery performances even after storage in a charged state and which can exhibit excellent charge/discharge cycle performance even when used at a high upper-limit voltage. The positive active material comprises: base particles able to dope and release lithium ions; and an element in Group 3 of the periodic table present on at least part of that part of the base particles which is able to come into contact with an electrolyte. It is produced by, e.g., a process which comprises: producing base particles containing lithium and able to dope and release lithium ions; and then imparting an element in Group 3 of the periodic table to the base particles so that the element can be present on at least part of that part of the base particles which is able to come into contact with an electrolyte.

A nonaqueous electrolyte secondary battery includes a case, a nonaqueous electrolyte provided in the case and containing a linear sulfite, a positive electrode provided in the case and capable of absorbing-releasing Li element or Li ions, and a negative electrode provided in the case and containing a lithium titanium oxide and a conductive agent that includes a carbonaceous material.

The invention provides a comprehensive recycling method of a lithium ion battery anode material. The method comprises the steps that the anode material of lithium iron phosphate and the anode material of a ternary battery are subjected to high-temperature pretreatment; a product is added into water for pulping processing; concentrated sulfuric acid and hydrogen peroxide are added, and filtering is performed to remove undissolved substances; iron powder is added, filtering is performed to remove copper elements, and heating is performed to generate iron aluminum vanadium slag; a calcium chloride solution is added, and filtering is performed to remove phosphate radicals; series-connection countercurrent extraction is performed through an extraction agent P204 to remove Fe and Ca impurities, and series-connection countercurrent extraction is performed through an extraction agent P507 to separate Ni, Co, Mn elements from Li elements; the organic phase is subjected to reverse extraction with sulfuric acid, a Ni, Ca and Mn solution is obtained, and recycling of nickel, cobalt and manganese is achieved; and the water phase is concentrated, and then a saturated sodium carbonate solution is added to generate lithium carbonate precipitation. By means of the comprehensive recycling method, the anode material of a lithium iron phosphate battery and the anode material of the ternary battery are recycled simultaneously, the battery separation cost is lowered, and the economic benefits of lithium battery recycling are increased.

The invention discloses low-density and high-rigidity aluminum-lithium alloy and a method for preparing the same. The low-density and high-rigidity cast aluminum-lithium alloy comprises, by weight, 3-3.5% of Li, 1-2% of Cu, 0.5-2% of Mg, 0.4-0.8% of Ag, 0.14-0.2% of Zr, 0.3-0.8% of Mn, lower than 0.25% of impurity elements Si, Fe, Na and K and the balance Al. The low-density and high-rigidity cast aluminum-lithium alloy and the method have the advantages that alloy elements (the Li, the Cu, the Mg, the Ag, the Zr and the Mn) are added by the aid of the method, solid solution and aging treatment is carried out by the aid of the method, and accordingly the low-density and high-rigidity cast aluminum-lithium alloy with excellent mechanical properties can be obtained and is high in elastic modulus and low in density as compared with the traditional cast aluminum alloy; the low-density and high-rigidity cast aluminum-lithium alloy is high in Li element yield and low in cost.

The invention provides an LiBH4-silver/silver halide compound fast-ion conductor and a preparation method thereof. The LiBH4-silver/silver halide compound fast-ion conductor is prepared from LiBH4 and silver or silver halide which are at the mole ratio of 20:1 to 4:1. The preparation method of the LiBH4-silver/silver halide compound fast-ion conductor, which is provided by the invention, is simple and low in cost, and can be used for stabilizing the high-temperature phase of LiBH4 and increasing the diffusion channel of an Li element by forming an LiBH4-Ag/AgX (X is a halogen element) compound by adding Ag and the halide of Ag to LiBH4, thus greatly enhancing the ionic conductivity compared with the ionic conductivity of LiBH4, achieving the cm-1 order of magnitude at 100 DEG C for 10-3 seconds and providing wider application prospect for solid electrolyte.

A positive electrode mix including a solid electrolyte and a sulfur-based active material, wherein the solid electrolyte comprises a Li element or a Na element; a S element; and a halogen element selected from the group consisting of I, Br, Cl and F.

A high magnification spherical lithium iron phosphate composite positive electrode material and preparation method are provided. The positive electrode material comprises the following raw material components: iron phosphate, lithium source, carbon source A, metal oxide additive, dispersant and carbon source B; among them, Li element in lithium source accounts for 6.0% -8.0% of the mass of iron phosphate; carbon source A accounts for 0.3%-12.5% of the mass of iron phosphate; the metal oxide additive accounts for 0.5%-5.0% of the mass of ferric phosphate; the dispersant accounts for 0.2%-1.5% of the mass of ferric phosphate; carbon source B accounts for 1% -15.0% of the mass of iron phosphate. The preparation method comprises the following steps: (1) grinding the ingredients; (2) spray drying and granulating; (3) heat treatment, adding carbon source A and metal oxide additive in the grinding process, adding carbon source B in the heat treatment process. The lithium iron phosphate positive electrode material prepared by the invention is spherical shape particles, the surface and the interior of the lithium iron phosphate positive electrode material are uniformly coated with metal-doped carbon, the conductivity is high, the crystallinity is good, the compaction density is 1.3 g/cm3 to 1.8 g/cm3, and the 10C discharge capacity can reach 148mAh/g.

To provide a cathode active material which achieves a high discharge capacity and excellent cycle durability.

A cathode active material represented by Li_aMO_x (wherein M is an element including at least one member selected from Ni element, Co element and Mn element (other than Li element and O element), “a” is from 1.1 to 1.7, and x is the number of moles of O element required to satisfy the valences of Li element and M),

• • wherein in an X-ray diffraction pattern, the ratio (I/r) of the crystallite size (I) of (003) plane to the crystallite size (r) of (110) plane assigned to a crystal structure with space group R-3m is at least 2.6.

The invention provides a method of producing a solid state lithium battery module in which the occurrence of short circuit caused by dendrites is suppressed. The invention solves this problem by providing a method of producing a solid state lithium battery module, including steps of: a pressing step of pressing a sulfide glass having an ion conductor containing a Li element, a P element, and a S element, and forming a solid electrolyte layer; and a restraining step of restraining a solid state lithium battery including the solid electrolyte layer, using restraining member, wherein, in the pressing step, the solid electrolyte layer is formed such that the average pore radius obtained by a mercury intrusion method is R (μm), and in the restraining step, the solid state lithium battery is restrained such that when the confining pressure is designated as P(MPa), the relationship: P≦−5900R+74 is satisfied.

The invention relates to the field of anode materials, in particular to a composite anode active material and a preparation method thereof, an anode and a battery. The composite anode active materialhas a core-shell structure, wherein a core contains an anode active material, a shell layer contains a silicate material of a pmn2<1> crystal structure, the silicate material contains Li elements andM elements, and the M elements are divalent metal elements. According to the composite anode active material with the core-shell structure, lithium-supplementing agents are distributed on the shell layer, the anode active material is formed in the core, so that the lithium-supplementing agents are distributed more uniformly and combined more tightly, lithium disembedding performance is better, andthe composite anode active material has an excellent lithium-supplementing effect and can obtain better circulation performance.

The invention discloses a corrosion-resistant and high-strength and toughness Zn-Fe-Li-based zinc alloy capable of being degraded in a human body and an application of the corrosion-resistant and high-strength and toughness Zn-Fe-Li-based zinc alloy, relates to field of medical implantation materials, and provides the corrosion-resistant and high-strength and toughness Zn-Fe-Li-based zinc alloy which is low in cost of added materials, high in strength, good in plasticity and controllable in degradation rate, has non-expanding and non-migrating degradation products and can be simultaneously degraded in the human body against the defects in the prior art. The zinc alloy comprises Zn, Fe and Li elements, wherein the content of the Zn element in mass percentage is 80-99.997%, the content of the Fe element in mass percentage is 0.002-10%, and the content of the Li element in mass percentage is 0.001-10%. The cost of the materials added into the zinc-based alloy disclosed by the invention is low, the degradation products of various components in the prepared alloy material can be degraded in the human body by metabolism, the corrosion resistance is much higher than that of a magnesium alloy, the degradation speed is greatly reduced, the mechanical support can be provided for a longer time, and the alloy material has good strength and toughness.

The invention discloses a method for preparing a high-voltage cathode material lithium-nickel-manganese-oxygen battery. The method comprises a plurality of steps of: dismantling an electric core, immersing the electric core, filtering and separating, preparing acidic filtrate, preparing coprecipiate, and preparing a lithium-nickel-manganese-oxygen battery. The method has the advantages that: 1, comprehensive recycling of Mn, Ni, Li, Al and Cu in waste and old LiMnO batteries, lithium nickel batteries and lithium nickel-manganese batteries is realized, Mn or Ni and Li elements are not needed to be separated, and the new good-performance high-voltage cathode material lithium-nickel-manganese-oxygen battery is synthesized directly; 2, the process is simple, the method is suitable for mass processing, the cost is low, the obtained battery has an impressive market prospect, and the additional value is high; and 3, the recycling rate of manganese and nickel metal in the battery is over 96 percent, and the recycling rate of lithium carbonate is 78 percent.

To provide a cathode active material to be used for a positive electrode of a lithium ion secondary battery having a high discharge capacity and favorable cycle durability.

A cathode active material, which comprises a lithium-containing composite oxide containing at least one transition metal element (X) selected from the group consisting of Ni element, Co element and Mn element, and Li element (provided that the molar ratio (Li/X) of the Li element based on the total amount of the transition metal element (X) is from 1.1 to 1.7),

wherein the aspect ratio of primary particles is from 2.5 to 10, and

in an X-ray diffraction pattern, the ratio (I₀₂₀/I₀₀₃) of the integrated intensity (I₀₂₀) of a peak of (020) plane assigned to a crystal structure with space group C2/m to the integrated intensity (I₀₀₃) of a peak of (003) plane assigned to a crystal structure with space group R-3m is from 0.02 to 0.3.

The present invention provides a positive electrode active material, a positive electrode, a lithium ion secondary battery, and a method for producing the positive electrode active material, for a lithium ion secondary battery which exhibits superior cycle characteristics and rate characteristics even when charged with high voltage. The invention is characterized by comprising particles (II) in which an oxide (I) of at least one type of a metal element selected from a group consisting of Zr, Ti, and AI is unevenly distributed on the surface of a lithium-containing complex oxide containing Li and at least one type of transition metal element selected from a group consisting of Ni, Co, and Mn (with the proviso that the molar quantity of the Li element is greater than 1.2 times the total molar quantity of the transition metal element or elements).

The invention provides a preparation method of a carbon nano-Li2FeSiO4 composite cathode material. The preparation method comprises the following steps of: uniformly loading different contents of silica on the surface of a carbon nanomaterial, taking a carbon nano-silica compound as a template, dissolving the carbon nano-silica compound in ethanol according to the molar ratio of Fe element to Si element to Li element of 1: 1: 2 and carrying out uniform ultrasonic mixing; stirring the mixing liquid at 60 DEG C till the ethanol is completely volatilized, uniformly grinding the obtained solid in an agate mortar, and tabletting the powder obtained after grinding; and heating the tablets in an inert atmosphere to 550-650 DEG C and calcining at constant temperature for 5-10h to obtain the carbon nano-Li2FeSiO4 composite cathode material with a core-shell structure.

The invention, which belongs to the technical field of the solar battery, discloses a cadmium-telluride thin-film solar battery comprising a glass substrate, a lamination structure, a transparent conductive layer, a buffer layer, an n type semiconductor layer, a p type semiconductor layer, a back contact layer and a back electrode layer. The lamination structure, the transparent conductive layer, the buffer layer, the n type semiconductor layer, the p type semiconductor layer, the back contact layer and the back electrode layer are arranged on the glass substrate successively along a direction far away from the glass substrate. The lamination structure consist of an inhibition layer and a dielectric medium layer; the inhibition layer is arranged on the glass substrate; the dielectric medium layer is arranged between the inhibition layer and the transparent conductive layer; the inhibition layer contains Si and O elements as well as at least one of a Al element and a B element and at least one of a Li element and a K element; and the inhibition layer and the dielectric medium layer have light-transmitting properties. In addition, the invention also discloses a preparation method for the cadmium-telluride thin-film solar battery. The lamination layer structure is set and is used as a front contact element of the cadmium-telluride thin-film solar battery, so that the short-circuit current of the cadmium-telluride thin-film solar battery is increased.

The present invention provides lithium nickelate-based positive electrode active substance particles having a high energy density which are excellent in charge/discharge cycle characteristics when highly charged, and hardly suffer from generation of gases upon storage under high-temperature conditions, and a process for producing the positive electrode active substance particles, as well as a non-aqueous electrolyte secondary battery. The present invention relates to positive electrode active substance particles each comprising a core particle X comprising a lithium nickelate composite oxide having a layer structure which is represented by the formula: Li_1+aNi_1-b-cCo_bM_cO₂ wherein M is at least one element selected from the group consisting of Mn, Al, B, Mg, Ti, Sn, Zn and Zr; a is a number of −0.1 to 0.2 (−0.1≦a≦0.2); b is a number of 0.05 to 0.5 (0.05≦b≦0.5); and c is a number of 0.01 to 0.4 (0.01≦c≦0.4); a coating compound Y comprising at least one element selected from the group consisting of Al, Mg, Zr, Ti and Si; and a coating compound Z comprising an Li element, in which a content of lithium hydroxide LiOH in the positive electrode active substance particles is not more than 0.40% by weight, a content of lithium carbonate Li₂CO₃ in the positive electrode active substance particles is not more than 0.65% by weight, and a weight ratio of the content of lithium carbonate to the content of lithium hydroxide is not less than 1.

The invention discloses a low-temperature sintered bismuth layer-structured piezoelectric ceramic material and a preparation method thereof. A chemical general formula of the piezoelectric ceramic material is Ca1-x-yLixAyBzBi4Ti4-zO15, wherein A is one or more of valence-variable doping elements Ce, Mn and Sr; B is one or more of valence-variable doping elements Cr, Nb and W; x, y and z are respectively mole fractions of a Li element, an A-position element and a B-position element; x is smaller than or equal to 0.1 and greater than 0; y is smaller than or equal to 0.1 and greater than or equal to 0; z is smaller than or equal to 0.1 and greater than or equal to 0; and y and z are not simultaneously zero. The piezoelectric ceramic material disclosed by the invention has the advantages of relatively low sintering preparation temperature, relatively high curie temperature, and excellent piezoelectric property and overall dielectric properties, and can be applied to various high-temperature piezoelectric devices.

The invention provides a preparation method of a lithium ion battery cathode material coated with carbon on the surface, providing a low-cost line for stably producing LiFePO4 and batteries thereof. The preparation method of the material comprises the following three steps of: partially carbonizing carbohydrate, preparing NH4MPO4 in a porous carbon material and preparing YMPO in the porous carbon material, wherein the Y element is Li element or alkali metal elements of Na and K or the combination of the elements, M is a divalent transition metal element ion or a certain MxN1-x containing the combination of metal elements of other valences, x is not smaller than 0 and is smaller than 1, and N is a trivalent transition metal element ion or a doped metal ion of other valences. Compared with other process lines, the process line of the invention has lower requirements for process control conditions, the product can have evener particles and stabler performance by synthesizing the LiFePO4 in a porous channel which is formed by carbonizing the carbohydrate, and the only two byproducts in the production process of the LiFePO4 can be favorably recycled.

The invention provides a magnesium-lithium alloy used for sand mold casting and a preparing method of the magnesium-lithium alloy. The magnesium-lithium alloy comprises, by weight percent, 3%-10% of Li, 2%-7% of Al, 0.5%-3.5% of Zn, 0.5%-3% of Nd, 0.5%-3% of Ce, 0.05%-0.2% of Ti, 0.005%-0.05% of C and the balance Mg and inevitable impurities. The preparing method includes smelting and heat treatment. According to the magnesium-lithium alloy used for sand mold casting and the preparing method of the magnesium-lithium alloy, Li, Al and Zn serve as the main alloy elements and Nd, Ce, Ti and C are added, so that the solid solution strengthening effect of the magnesium-lithium alloy use for sand mold casting is improved, shrinkage porosity defects are reduced, the sand mold casting performance is improved, grain growth of the alloy in the sand mold casting process and the later solid solution process is inhibited, segregation of the Li element is reduced, and the yield of the Li element is increased. According to the magnesium-lithium alloy used for sand mold casting and the preparing method of the magnesium-lithium alloy, magnesium-lithium alloy grains are well refined on the premise that the alloy cost is not improved obviously, and the beneficial effects that the sand mold casting forming performance is good, the comprehensive mechanical performance is high, and the cost is low are achieved.

The present invention provides a method for producing a cathode active material for a lithium ion secondary battery excellent in the discharge capacity and the cycle characteristics and having high durability, and methods for producing a lithium ion secondary battery and a cathode for a lithium ion secondary battery.

A lithium-containing composite oxide comprising Li element and at least one transition metal element selected from the group consisting of Ni, Co and Mn (provided that the molar amount of the Li element is more than 1.2 times the total molar amount of said transition metal element) and a composition (1) {a composition having a compound (1) containing no Li element and comprising Mn element as an essential component, dissolved or dispersed in a solvent} are contacted, followed by heating to produce a cathode active material for a lithium ion secondary battery.

The invention discloses a lithium, cerium, tungsten (Li, Ce, W) co-doped bismuth calcium niobate (CBN)-based piezoelectric ceramic material and a preparation method thereof. The piezoelectric ceramic material is characterized by being represented by the following general formula: Ca1-x(Li, Ce)x/2Bi2Nb2-yWyO9, wherein the x is greater than or equal to 0.02 and less than or equal to 0.15; the y is greater than or equal to 0.01 and less than or equal to 0.1; the X represents the mole fraction of an A-bit Li element and an A-bit Ce element; the Y represents the mole fraction of a B-bit W element. The preparation method comprises the following steps: preparing a CBN ceramic powder material with different doping quantities of the A-bit Li, the A-bit Ce and the B-bit W via a solid phase method; and carrying out the processes of granulation, tabletting, glue removing, sintering, silver coating and polarization so as to prepare the Li, Ce, W co-doped CBN-based piezoelectric ceramic material. The result shows that the Li, Ce, W co-doped CBN-based piezoelectric ceramic material prepared at a relatively low sintering temperature (about 1100 DEG C) has relatively compact and uniform crystalline grains, i.e., the sintering activity and the ceramic compactness are improved, so that a good sintering effect is obtained. Thus, the piezoelectric property of the piezoelectric ceramic material is greatly improved; the dielectric loss of the piezoelectric ceramic material is decreased.

The invention relates to the field of plasticity improvement of high-strength magnesium alloys, in particular to a method for improving plastic molding cavity of a high-strength Mg-Gd-Y-Nd-Zr magnesium alloy by effectively using an element Li, and solves the problem of weaker high-strength plasticity. Under the precondition of keeping relative contents of all elements in the alloy invariable, 5-20weight% of Li element is added to form a beta-Li phase with higher plasticity deformation capacity in the alloy; the volume fraction (20-90%) of forming the beta-Li phase is controlled to prepare a lithium-contained Mg-Gd-Y-Nd-Zr alloy with high strength and better plasticity; the alloy is smelted and hot rolled subsequently to prepare a plate; and the machining process is simple and convenient to operate. The tensile strength of the material under cast-state condition is ob=120-250 MPa, the yield strength is o0.2=80-150 MPa, the ductility is delta=10-30%, and the density is 1.50-1.89 g/cm3;and the plate cannot generate the edge cracking phenomenon after deformation with 40% of rolling quantity at room temperature.