71 results about "Li element" patented technology

A latent heat storage particle that comprises a core particle and a coating part covering at least a part of the surface of the core particle, wherein: the core particle is composed of an element selected from the group consisting of Al, Mg, Si, Ti, Fe, Ni, Cu, Zn, Sn, Sb, Ga, In, Bi, Pb and Cd or an alloy or a compound mainly composed of the same and has a melting point of 100° C. or higher; the coating part is composed of one or more selected from the group consisting of an element different from the component of the core particle, an alloy and an inorganic compound containing the element and a mixture thereof, which does not undergo a chemical reaction with the core particle in the temperature range of the operating temperature; and at least a part of the coating part is in a particulate shape.

The invention relates to the technical field of batteries, in particular to a composite positive electrode material and a preparation method and application thereof. A composite positive electrode material comprises a positive electrode base material, the chemical formula of the positive electrode base material is LimNixCoyMnzQaRdO2, m is larger than or equal to 1 and smaller than or equal to 1.2, and xlt is larger than or equal to 0.5; 1, 0lt; yt; Yt; 0.5, Li comprises a primary Li element and a secondary Li element, Q is a primary doping element, 0 lt; a < = 0.5, R is a secondary doping element, and 0 < d < = 0.5; x + y + z + a + d = 1, and the doping depth h of the secondary doping element meets 0 lt; h is less than or equal to 850nm; and the particle sizes D10, D50 and D90 of the positive electrode base material meet the condition that (D90-D10) / D50 is more than or equal to 0.8 and less than or equal to 1.15. According to the composite positive electrode material, the phenomena of enrichment of doping elements on the surface of a single crystal and non-uniform lithiation in the single crystal can be relieved, so that the capacity and the cycling stability of the positive electrode material are improved.

The present invention provides a method of using a wet method to recycle metal elements in lithium batteries, including the following steps: Step 1, pretreating lithium batteries, so as to obtain a mixture of powders containing positive-electrode materials; Step 2, acid leaching to obtain leachate; Step 3, if the to-be-recycled lithium battery contain a lithium iron phosphate battery, the solid products, obtained after acid leaching and solid-liquid filtration, are heated in an oxygen-containing atmosphere, so as to burn up carbon, then the left is ferric phosphate; Step 4, if the to-be-recycled lithium battery contains a ternary lithium battery, the leachate, obtained after acid leaching and solid-liquid filtration, is sent to an extraction step, wherein diisooctyl phosphate is used as extraction agent, so as to obtain a raffinate containing Li element and an organic phase containing Ni / Co / Mn elements.

The invention discloses a solid-state electrolyte material and a preparation method thereof, a solid-state battery and a device, the solid-state battery electrolyte material is composed of elements A, B, P and S, A represents a Li element, B represents a doping element, P represents a phosphorus element, and S represents a sulfur element; the chemical formula is AxByPSz, x + y is greater than or equal to 1, and z is between 1 and 3; the doping elements are selected from at least four or more of Ag, Au, Co, Cr, Cu, Fe, Hf, Mn, Mo, Nb, Ni, Pd, Rh, Ru, Sc, Ta, Ti, V, W, Y, Zn, Zr, Al, Sn, In, Bi, B, Ge and Si. The solid electrolyte material prepared by the invention has high conductivity and excellent thermal stability, and has huge application potential in the field of solid-state batteries.

The invention provides a preparation method of a high-compaction lithium iron phosphate positive electrode material, and the method comprises the following steps: providing a first lithium iron phosphate precursor and a second lithium iron phosphate precursor, the first lithium iron phosphate precursor and the second lithium iron phosphate precursor respectively comprising a Li element, a Fe element, a P element and an O element; the particle size Dv150 of the first lithium iron phosphate precursor is 2.0-3.5 m, and the particle size Dv250 of the second lithium iron phosphate precursor is 0.3-0.6 m; iron sources for preparing the first lithium iron phosphate precursor and the second lithium iron phosphate precursor are different; and mixing and sintering the first lithium iron phosphate precursor and the second lithium iron phosphate precursor, and crushing to obtain the lithium iron phosphate positive electrode material. According to the preparation method, the sintering yield of iron is relatively high, the process cost is saved, and the prepared lithium iron phosphate positive electrode material has relatively high compaction density and relatively high gram volume.

To provide an active metal brazing material which can suppress variation in joining.SOLUTION: An active metal brazing material contains one or two kinds of Ti component particles, CuSn alloy particles and CuIn alloy particles, wherein the Ti component particles are composed of one or more kinds of Ti particles and Ti hydride particles, the CuSn alloy particles are composed of Cu and Sn, when the total of Cu and Sn is 100 pts.mass, Cu is 30 pts.mass or more and 80 pts.mass or less, and Sn is 20 pts.mass or more and 70 pts.mass or less, the CuIn alloy particles are composed of Cu and In, and when the total of Cu and In is 100 pts.mass, Cu is 30 pts.mass or more and 80 pts.mass or less, and In is 20 pts.mass or more and 70 pts.mass or less.SELECTED DRAWING: Figure 1

An all-solid-state battery includes a positive electrode layer, a solid electrolyte layer, and a negative electrode layer. A negative electrode mixture layer of the negative electrode layer contains either one or both of a negative electrode active material and a carbon material, a first phase in contact with at least a part of the negative electrode active material and the carbon material, and a second phase in contact with at least a part of the first phase. The first and second phases contain a Li element and an X element which is at least one halogen element selected from the group consisting of F, Cl, Br, and I. An X element concentration in the first phase is higher than in the solid electrolyte layer. An X element concentration in the second phase is lower than the in the first phase and in the solid electrolyte layer.

A catalytic electrode includes a nickel-based porous base material, and a plurality of catalytic alloy balls of nickel and another metal doped with elements, in which the another metal includes iron, the elements include C, F, and S, and the catalytic alloy balls are dispersed on the surface of the nickel-based porous base material. The catalytic electrode also includes a plurality of metal phosphide particles covering the nickel-based porous base material and the catalytic alloy balls, and the metal phosphide particle includes nickel phosphide, nickel iron phosphide, nickel cobalt phosphide, nickel copper phosphide, or nickel zinc phosphide.

The invention provides a device for selectively capturing and separating lithium ions and a preparation method thereof, a roughened copper net is used as a substrate, mercapto polyoxyethylene azobenzene spirobipyridine is used as a capturing agent, and the capturing agent and the roughened copper net are combined through a Cu-S bond, so that the device for selectively capturing and separating lithium ions is obtained. And forming the Azo-2P-PEGn-SCu device which is supported by the roughened copper mesh and of which the surface is covered with the Azo-2P-PEGn-S fragments. The selective capture type lithium ion separation device provided by the invention has relatively good combination selectivity with the lithium salt, the separation of the lithium element does not depend on any crystallization process, and the separation percentage of the Li element is not less than 87%. The Azo-2P-PEGn-SCu device provided by the invention is regenerated by adopting light irradiation, no three wastes are formed in the regeneration process, and the regenerated Azo-2P-PEGn-SCu device still has relatively good selectivity on the lithium salt.

The invention provides a preparation method of a high-strength corrosion-resistant ultralight dual-phase Mg-Li-Zn-Nd alloy, and belongs to the field of magnesium-lithium alloy processing. The method comprises the following steps: carrying out vacuum melting on raw materials to obtain a melt with uniformly distributed components; the obtained melt is subjected to casting molding and machining, and an extrusion blank is obtained; carrying out gradient time sequence pulse current treatment on the obtained extruded blank to obtain a homogenized blank; and the obtained homogenized blank is subjected to positive and negative combined pulse current auxiliary extrusion treatment, and the Mg-Li-Zn-Nd alloy is obtained. According to the method, rapid dissolution of a coarse second phase can be promoted in the gradient time sequence pulse current treatment stage, Li element volatilization and original grain growth are inhibited, alpha-Mg recrystallization is promoted in the positive and negative combined pulse current auxiliary extrusion stage, beta-Li grain growth is inhibited, precipitated phase dispersed distribution is induced, synchronous improvement of strength and corrosion resistance is achieved, and the method is suitable for industrial production. And the light high-strength corrosion-resistant magnesium-lithium alloy meeting the application of key parts of special equipment, unmanned aerial vehicles and medical instruments is obtained.

The present application relates to a positive electrode material, an electrochemical device, and an electronic device. The positive electrode material comprises a lithium transition metal composite oxide, the lithium transition metal composite oxide comprises a Li element, a Na element, and a T element, and the T element comprises at least one of Ni, Co or Mn. An electrode comprising the positive electrode material and a lithium sheet are assembled into a button cell, and when the button cell is charged to 4.5 V at a current of 0.04 C within a voltage range of 2.8 V to 4.5 V, the molar ratio of the Li element to the T element in the lithium transition metal composite oxide is w1 which satisfies w1≤0.2. The positive electrode material of the present application has a relatively low lithium content in a charging state, such that the utilization rate of lithium ions in the material can be greatly increased, improving the energy density of an electrochemical device.

The invention belongs to the technical field of advanced ceramics and energy storage, and particularly discloses Li-Zr double-site co-doped garnet solid electrolyte ceramic as well as a preparation method and application thereof, and the chemical formula of the Li-Zr double-site co-doped garnet solid electrolyte ceramic is Li6 (Al < 0.1 > Ga < 0.1 >) La3Zr1.6 (Nb < 0.2 > Ta < 0.2 >) O12; the Li element is from a lithium source, the Al element is from an aluminum source, the Ga element is from a gallium source, the La element is from a lanthanum source, the Zr element is from a zirconium source, the Nb element is from a niobium source, and the Ta element is from a tantalum source. According to the Li-Zr double-site co-doped garnet solid-state electrolyte ceramic as well as the preparation method and the application thereof, the Li-Zr double-site co-doped garnet solid-state electrolyte ceramic has relatively high ionic conductivity, and the cycling stability and the rate capability of a solid-state battery can be improved.

A coated active material includes: an electrode active material; and a coating layer that covers the electrode active material, wherein: the electrode active material includes a Li element, an M element, and an O element; M is a metal other than Li, and at least includes Ni; a molar ratio (Ni / M) of Ni to M is 80% or more; the coating layer includes a B element, a P element, a La element, and an O element; and a molar ratio (La / P) of the La element to the P element is 0.005 or more and 0.15 or less.

The invention provides a co-doped mechanoluminescent material and a preparation method thereof, and a force-sensitive response household component and a preparation method thereof, and belongs to the field of mechanoluminescent materials. The chemical formula of the co-doped mechanoluminescent material provided by the invention is Ca < 1-x > Li < x > Zn < 0.98-x > Mn < 0.02 > Nb < x > OS, wherein x is more than 0 and less than or equal to 0.1. According to the co-doped mechanoluminescence material disclosed by the invention, the Li element and the Nb element are introduced into the CaZn0. 98Mn0. 02OS mechanoluminescence material, so that the co-doped mechanoluminescence material with excellent mechanoluminescence performance is formed. Compared with most existing mechanoluminescence materials, the mechanoluminescence intensity of the co-doped mechanoluminescence material is remarkably improved, and the mechanoluminescence threshold value is relatively low. Especially when the doping concentration of Li and Nb is 0.05, compared with non-co-doping, when the external force is applied to be 0.2 N, the improvement multiple can reach 34.6 times.

The invention provides a single-crystal positive electrode material, a preparation method thereof and a lithium ion battery. The single-crystal positive electrode material comprises a positive electrode base material and a tungsten-containing coating layer coating the surface of the positive electrode base material, the tungsten-containing coating layer comprises a water-soluble tungsten-containing material and an acid-soluble tungsten-containing material; the positive electrode base material comprises a nickel-based layered oxide positive electrode material; the single-crystal positive electrode material meets the condition that C1 / C2 is greater than or equal to 80%, C1 is the mass ratio of the W element in the water-soluble tungsten-containing material in the single-crystal positive electrode material, which is tested by an ICP (Inductively Coupled Plasma) water-soluble method, to all metal elements except the Li element, and C2 is the mass ratio of the W element in the acid-soluble tungsten-containing material in the single-crystal positive electrode material, which is tested by an ICP acid-soluble method, to all metal elements except the Li element. Through the tungsten-containing coating layer for regulating and controlling the lithium-tungsten ratio, the structure of the coating layer is stable, the coating effect is excellent, the capacity and the cycle performance under high voltage are improved, and the gas production rate in the cycle process is effectively reduced.

The application discloses a high-strength and high-plasticity Mg-Y-Zn-Si-Li-Al alloy and a preparation method thereof, and relates to the technical field of light alloy processing. 97.5 Y1Zn 0.5 In the Mg 97.5 Y1Zn 0.5 Si1base alloy, the Si element is combined with the Y element to form a YSi hard and brittle phase, which is easy to hinder the elongation of the alloy; the addition of the Li element plays a grain refining role on the one hand, effectively improves the strength of the alloy, and optimizes the second phase form on the other hand, promotes the transformation of the second phase to the nanometer level, provides more slip paths for dislocation movement, and avoids plasticity deterioration; the Al element is further combined with the Y element to form a high-strength Al2Y strengthening phase, which not only reduces the precipitation of the hard and brittle phase, but also stabilizes the organizational structure through the pinning effect at the grain boundary.

A sulfide solid electrolyte includes: a Li element; a P element; a S element; and a Ha element. The sulfide solid electrolyte has an argyrodite crystal structure. The crystal structure includes a plurality of PS4 tetrahedrons where the P element may be substituted and at least a part of the S elements may be substituted. The crystal structure includes 16 elements serving as the vertices of the PS4 tetrahedrons T1 in a unit cell. When the 16 elements are made to correspond to 16 S elements constituting vertices corresponding to 16e sites of PS4 tetrahedrons T2 in a space group F-43m, an average value of a distance Δ between respective positions of the 16 elements in the PS4 tetrahedrons T1 and respective positions of the 16 S elements in the PS4 tetrahedrons T2 corresponding thereto is 0.05 Å to 0.30 Å.

Provided is a flux-cored wire for welding of structures in extremely low temperature regions, which is capable of obtaining a weld metal having excellent strength and a transverse bulging amount of a desired value or more. The flux-cored wire is defined in terms of the contents of Fe, C, Cr, Ni, etc. in the total mass of the wire, and contains Nb: 0.001 to 0.15 mass%, and V: 0.005 to 0.30 mass%. In addition, the value A1 calculated from formula (1) is 0.02 to 0.30, and the value A2 calculated from formula (2) is 10.0 to 12.3. Formula (1): A1 = [Nb] + [V] Formula (2): A2 = 1.31 x (0.98 x [Cr] + [Mo] + 0.7 x [Nb]) - 1.1 x ([Ni] + 35 x [C] + 20 x [N] + 0.25 x [Cu]). Wherein, [element] is a value indicating the content of the element in the flux-cored wire in mass%. W W W W W W W W W W is a value indicating the content of the element in the flux-cored wire in mass%.​​​​​​​​​

The invention belongs to the technical field of soluble magnesium alloy rods, and discloses a soluble magnesium alloy rod with enhanced elongation, and the magnesium alloy rod comprises the following chemical components in percentage by mass: 1.5%-14.5% of Gd element, 0.5%-4.0% of Y element, 0.1%-2.5% of Zn element, 0.2%-0.5% of Zr element, 0.01%-0.5% of Li element, 0.01%-0.6% of Ni element, 0.01%-0.5% of Ga element, 0.01%-0.5% of In element, 0.1%-2.0% of Cu element and the balance of Mg element. In component design, various elements are scientifically proportioned, the proportion of Gd to Y and the proportion of Zn to Zr are just right, specific elements are added to form a composite structure, the ductility is improved, the dissolution rate and strength are balanced by means of the Cu element, in the performance aspect, dissolution is accelerated at the high temperature of 200 DEG C, the dissolution rate is increased by 10%-15% compared with the room temperature, the degradation period can be shortened, a dissolved product is fine and uniform, and the degradation rate is high. The biocompatibility and environmental friendliness are excellent, the application field is wide, and degradable medical instruments are covered.

The present invention provides a rapid lithium element separation system and method driven by vacuum negative pressure. The system includes a chromatographic microcolumn, a beaker or a sample dissolution tank, a vacuum pump and a vacuum device; the chromatographic microcolumn is filled with a cation exchange resin, and both the upper and lower ends thereof are sealed with PE sieve plates; the beaker or the sample dissolution tank is located inside the vacuum device; the lower end outlet of the chromatographic microcolumn is connected to the beaker or the sample dissolution tank through an outlet pipeline via a pipeline valve and through the top cover of the vacuum device; an opening is provided on the side of the vacuum device and is connected to the vacuum pump through a vacuum pipeline; the beaker or the sample dissolution tank is used for receiving the waste liquid or the lithium-containing solution flowing out of the chromatographic microcolumn. The system and method provided by the present invention realize the rapid separation of Li element in geological samples through vacuum negative pressure drive and in combination with the chromatographic microcolumn method for ultra-clean laboratories.

The invention discloses a Mg-Y-Zn-Si-Li-Al alloy with a high product of strength and elongation and a preparation method of the Mg-Y-Zn-Si-Li-Al alloy, and relates to the technical field of light alloy processing. According to the Mg-Y-Zn-Si-Li-Al alloy with the high product of strength and elongation and the preparation method of the Mg-Y-Zn-Si-Li-Al alloy, in the Mg97.5 Y1Zn0. 5Si1 basic alloy, the Si element and the Y element are combined to form a YSi hard and brittle phase, and the phase serves as a stress concentration point and is prone to hindering improvement of the elongation of the alloy; the Li element is added, on one hand, the grain refinement effect is achieved, the alloy strength is effectively improved, on the other hand, the form of a second phase is optimized, the second phase is promoted to be converted to the nanoscale, more slippage paths are provided for dislocation motion, and plasticity deterioration is avoided; the Al element is further combined with the Y element to form a high-strength Al2Y strengthening phase, precipitation of hard and brittle phases is reduced, and the structure is stabilized through the pinning effect at the grain boundary.

α-Sialon phosphor particles containing Eu, wherein at least one slit is formed on a surface of the α-sialon phosphor particle, wherein the distance from the surface of the α-sialon phosphor particle to the bottom of the slot is equal to or greater than 200 nm and equal to or less than 1500 nm in at least one cross-section of the slot, wherein the α-sialon phosphor particle is formed from an α-sialon phosphor containing an Eu element, represented by the general formula: (M1 x , M2y,Eu z ) (Si 12-(m+n) Al m+n )(O n N 16-n ) (assuming that M1 is a monovalent Li element and M2 is a divalent Ca element), and in the general formula x = 0, 0 < y < 2.0, 0 < z ≤ 0.5, 0 < x + y, 0.3 ≤ x + y + z ≤ 2.0, 0 < m ≤ 4.0 and 0 < n ≤ 3.0 are satisfied, and wherein the α-sialon phosphor particle is produced by a process comprising: Mixing of raw materials containing an element that forms a Eu-containing α-sialon phosphor particle; Heating a mixture of the raw materials to obtain an α-sialon phosphor; Pulverizing the α-sialon phosphor obtained by heating to obtain the α-sialon phosphor particle; and Subjecting the α-sialon phosphor particle obtained by pulverization to an acid treatment to form the slit on the surface of the α-sialon phosphor particle, wherein the acid treatment is carried out by stirring the α-sialon phosphor particle obtained by pulverization in an aqueous acid solution at a stirring speed of 400 rpm or more, wherein the aqueous acid solution is an aqueous hydrofluoric acid solution or an aqueous mixed acid solution obtained by mixing hydrofluoric acid and nitric acid, and where the stock solution concentration of the aqueous acid solution is equal to or higher than 0.7% and equal to or lower than 100%.

The invention relates to a solid-state battery and a method for manufacturing the solid-state battery. The main purpose of the present invention is to provide a solid-state battery in which deterioration due to moisture is suppressed. The present disclosure solves the problem by providing a solid-state battery having a positive electrode active material layer, a negative electrode active material layer, and a solid electrolyte layer disposed between the positive electrode active material layer and the negative electrode active material layer, the positive electrode active material layer, the negative electrode active material layer, and the solid electrolyte layer contain a sulfide-coated solid electrolyte as an electrolyte, the sulfide-coated solid electrolyte has a sulfide solid electrolyte and a coating layer that coats the surface of the sulfide solid electrolyte, and the sulfide solid electrolyte contains at least Li element, S element, and P element. The coating layer contains a modifier, and the modifier is at least one of a compound represented by general formula (1), a compound represented by general formula (2), a polymer of the compound represented by general formula (1), and a polymer of the compound represented by general formula (2).

The invention relates to a coated active material, an electrode mixture, a battery, and a coating liquid. The coated active material includes: an electrode active material; and a coating layer coating the electrode active material, wherein the electrode active material has Li element, M element, and O element; m is a metal other than Li and contains at least Ni; the molar ratio of Ni to M (Ni / M) is 80% or more, the coating layer contains element B, element P, element La, and element O, and the molar ratio of element La to element P (La / P) is 0.005-0.15 (inclusive).

The present disclosure provides an all-solid-state battery comprising: a positive electrode active material layer; a negative electrode active material layer; and a solid electrolyte layer disposed between the positive electrode active material layer and the negative electrode active material layer, wherein at least one of the positive electrode active material layer, the negative electrode active material layer, and the solid electrolyte layer contains a solid electrolyte; and the solid electrolyte contains a Li element, an Al element, an M element (M is at least one kind of B, Ga, In, and Tl), and a halogen element, and the halogen element is a main component of an anion.

The present invention discloses a process for selectively extracting lithium from lithium manganese iron phosphate batteries, belonging to the field of resource recovery and treatment of waste cathode materials for new energy batteries; the obtained waste LiMn 1‑x Fe x PO4 battery cathode powder is sulfuric acid acidified with H2SO4. After the reaction is completed, the acidified material is crushed and then subjected to oxidative roasting. After roasting, the material is washed with water to obtain a lithium-rich solution. The lithium-rich solution uses a LiOH solution as a precipitant to adjust the pH of the lithium-rich solution and remove metal impurities in the solution. Subsequently, sulfur is supplemented to the purified solution after impurity removal, and finally, the sulfur-supplemented solution is evaporated and crystallized to obtain Li2SO4; the present invention can effectively extract the lithium element in the LMFP cathode powder, and the lithium recovery rate is high. The whole process is simple, and the consumption of inorganic acids, organic acids, etc. is small or even zero, which can further reduce the enterprise's recycling cost and environmental pollution pressure.

A main object of the present disclosure is to provide a cathode layer capable of suppressing an initial-resistance of a battery. The present disclosure achieves the object by providing a cathode layer to be used for a lithium ion secondary battery, the cathode layer comprising: a cathode active material and a carbon nanotube, wherein the cathode active material contains a lithium-nickel-based complex oxide including at least a Li element, a Ni element, an O element, and an X element of which valence is 1 or 2 (excluding Li element and Ni element), and a tungsten present in at least one of inside or on the surface of the lithium-nickel-based complex oxide; the cathode active material is a secondary particle including a plurality of primary particles and a void formed among the plurality of primary particles; the cathode layer contains, as the carbon nanotube, a first carbon nanotube, at least partially included in the secondary particle; and when a spectrum in a position (10195 eV to 10206 eV) where a peak of L absorption edge of tungsten measured by an X-ray absorption fine structure analysis (XAFS) satisfies below: formula (1): (a−b) / (c−b)≤0.79; [in the formular (1), “a” represents an energy (eV) at the time when a slope of the spectrum in the range of 10195 eV to 10206 eV is the maximum; and when A designates a spectral intensity in the “a” (eV), “b” represents an energy (eV) where a spectral intensity in WO2 (tungsten oxide (IV)) in the range of 10195 eV to 10206 eV is the A; and “c” represents an energy (eV) where a spectral intensity of WO3 (tungsten oxide (VI)) in the range of 10195 eV to 10206 eV is the A.]

A method of using a chlorination method to recycle metal elements in lithium batteries includes, organic components in the lithium battery are removed, so as to obtain a mixture of powders containing the positive-electrode material; the powders are heated and chlorinated by chlorine, at a heating temperature of 500-1200° C.; gas products of the chlorination are output through a gas-solid filtration device, and then two stages of desublimation are used, wherein the temperature during the first-stage desublimation is set to be below 306° C. and above 178° C., so that FeCl3 is desublimated into solid deposition, which is used for recycling Fe element; the temperature of the second-stage desublimation is set to be below 178° C., so that AlCl3 is desublimated into solid deposition, which is used for recycling Al element; solid products of the chlorination are taken out for recycling the Li element.

A method of using a chlorination method to recycle metal elements in lithium batteries includes, organic components in the lithium battery are removed, so as to obtain a mixture of powders containing the positive-electrode material; the powders are heated and chlorinated by chlorine, at a heating temperature of 500-1200° C.; gas products of the chlorination are output through a gas-solid filtration device, and then two stages of desublimation are used, wherein the temperature during the first-stage desublimation is set to be below 306° C. and above 178° C., so that FeCl3 is desublimated into solid deposition, which is used for recycling Fe element; the temperature of the second-stage desublimation is set to be below 178° C., so that AlCl3 is desublimated into solid deposition, which is used for recycling Al element; solid products of the chlorination are taken out for recycling the Li element.

To provide a lithium ion secondary battery which can suppress drop of the charge capacity.SOLUTION: The lithium ion secondary battery uses a precipitation-dissolution reaction of metal lithium, and includes: a positive electrode layer, a negative electrode layer, and an electrolyte layer between the positive electrode layer and the negative electrode layer. The positive electrode layer contains a positive electrode active material capable of occluding and discharging lithium ions. The negative electrode layer contains a Mg element, an In element, a Sn element, and a Li element.SELECTED DRAWING: Figure 1