95 results about "Lithium electrolyte" patented technology

The invention discloses a sulfur-containing composite anode material which is of a core-shell structure, wherein a core is a C/S (carbon/sulfur) composite composited by utilizing elemental sulfur and nano conductive carbon black; and a shell is an organic polymer clad film layer containing a plasticizer. The preparation method comprises the following steps: mixing the sulfur and carbon and heating to obtain the C/S composite; adding an organic polymer solution; emulsifying and shearing the mixture; and finally filtering and drying. The invention further discloses an anode plate which comprises an aluminum current collector and the sulfur-containing composite anode material coated on the aluminum current collector. The anode plate is prepared by ball milling and blending the sulfur-containing composite anode material with adhesives, a solvent and process additives, and printing or coating on the aluminum current collector. The invention also discloses a Li-S (lithium-sulfur) secondary battery which is formed by packaging a battery core and an electrolyte, wherein the battery core mainly comprises a cathode component, a polymer porous diaphragm and the anode plate. The cathode component comprises a lithium foil, and the electrolyte comprises an organic solvent and lithium electrolyte salts. The secondary battery disclosed by the invention has the advantages of high specific energy and good cycle performance.

The invention relates to a lithium ion secondary battery and a preparation method thereof. The cathode of the battery is a lithium ion battery silicon-based cathode containing a gel coating and comprises a current collector, a silicon-based cathode material loaded on the current collector and the gel coating which is coated on the surface of the silicon-based cathode material through heat treatment after coating, wherein the gel coating comprises a polymer matrix material, a non-aqueous solvent, a toughening agent and a lithium electrolyte salt dissolved in the non-aqueous solvent and has a thickness of 5 to 50 mu m, preferably, 10 to 20 mu m. According to the invention, the cathode of the lithium ion secondary battery is coated with the gel coating, and the gel coating comprises a polymer matrix with high elasticity and high viscosity and electrolyte containing a lithium salt, is coated on the surface of the silicon-based cathode and forms a semi-solid gel layer on the surface of the cathode and in pores through heat treatment, thereby alleviating pulverization of particles of active substances in the silicon-based cathode during the processes of charging and discharging and avoiding re-agglomeration of the particles.

A thermal battery which comprises a number of stacked cells, each cell consisting essentially of an anode with a lithium compound, a lithium free pyrotechnic heat source pellet which includes a cathode precursor and an all lithium electrolyte layer separating between the anode and the pyrotechnic heat source pellet. Upon ignition of the heat source, an oxide of the cathode precursor is obtained which is lithiated by the lithium supplied by the all lithium electrolyte ion source.

The invention provides a high temperature-resistant electrolyte solution of a lithium ion battery. The high temperature-resistant electrolyte solution of the lithium ion battery comprises the raw materials of lithium electrolyte salt, an organic solvent, a high temperature-resistant additive, a film forming additive and a circulatory stability additive, wherein the concentration of the lithium electrolyte salt in the organic solvent is 0.5-2 mol/L; the organic solvent comprises the following components in parts by volume: 5-30 parts of a high-dielectric-constant organic base solvent, 40-65 parts of a high-boiling-point organic solvent, and 5-55 parts of a low-viscosity organic solvent; the high temperature-resistant additive is at least one of lithium tetrafluoroborate, lithium difluoroborate, lithium bis(malonato)borate, lithium bis(oxalate)borate and lithium malonato oxalate borate, the mass of the high temperature-resistant additive accounts for 0.1-8% of the total mass of the electrolyte solution, the mass of the film forming additive accounts for 0.2-4% of the total mass of the electrolyte solution, and the mass of the circulatory stability additive accounts for 0.5-5% of the total mass of the electrolyte solution. According to the invention, the high temperature resistance and circulatory stability of the lithium ion battery are effectively improved.

The invention discloses a method for preparing lithium carbonate by extracting lithium salt from aluminum electrolytic high-lithium electrolyte waste, which specifically comprises the following stepsof S1, taking the aluminum electrolytic high-lithium electrolyte waste as a raw material to prepare a lithium sulfate solution; S2, filtering the lithium sulfate solution prepared in S1 to obtain filter residue and filter liquor, returning the obtained filter residue to an aluminum electrolytic cell to be used as aluminum electrolyte, and enabling the obtained filter liquor to be standby for lateruse; S3, performing impurity removal, lithium precipitation and secondary filtering to obtain crude lithium carbonate for later use; S4, washing and drying the crude lithium carbonate prepared in theS3 to obtain a lithium carbonate finished product. By taking the aluminum electrolytic high-lithium electrolyte waste as the main raw material to produce the lithium carbonate product, the more expensive and scarce lithionite is replaced, so that the dependence of the lithium-electric energy materials in China on the lithionite is reduced, and the production cost of lithium carbonate is greatly reduced; the obtained filter residue are returned to the electrolytic cell for use, the lithium concentration of the original electrolyte is reduced, the property of the electrolyte is optimized, and the energy is saved.

The invention discloses a non-aqueous electrolyte and a lithium secondary battery using the same. The non-aqueous electrolyte contains lithium electrolyte salt, a non-aqueous organic solvent, a cesium salt compound additive and a film forming additive; the cesium salt compound additive accounts for, by weight, 0.01%-20% of the total amount of the non-aqueous organic solvent. In the non-aqueous electrolyte, the cesium salt compound additive can increase ionic conductivity of the electrode surface during charging and discharging, impedance formed on the electrode surface to an SEI film by a conventional film-forming additive is lowered, cyclic stability of the lithium secondary battery is well maintained, and low-temperature property and rate performance are obviously improved.

The present invention relates a battery comprising: a lithium salt of the formula:

Li₂B₁₂F_xZ_12-x

where x averages at least 4 but not more than 12 and Z is H, Cl, or Br, and a solvent having a higher dielectric constant than a solvent consisting of a 3:7 ratio by weight of ethylene carbonate (EC) and diethyl carbonate (DEC).

Disclosed is a lithium secondary battery comprising an electrode assembly composed of a cathode, an anode and a separator, and a lithium electrolyte, wherein the electrodes and/or electrolyte include a compound (“urethane compound”) and/or polymer (“poly urethane”) which are decomposed upon overcharge of the battery and contain a urethane group in a molecular structure thereof. The lithium secondary battery of the present invention is characterized by addition of a compound or polymer having a urethane group to electrodes and/or electrolyte, wherein the thus-added compound and/or polymer have substantially no adverse effects on general performance of the battery under normal operating conditions and are decomposed with high reliability upon overcharge of the battery, thereby offering time delay effects for securing battery safety, and the decomposition products thereof result in sharply increased internal resistance of the battery, thereby increasing battery safety.

The present invention relates to an ion-exchange fibre, its synthesis method and application. Said alkaline ion-exchange fibre adsorbent is acrylonitrile-methyl methacrylate-itaconate tripolymer containing amino functional group, can remote the acidic matter, transition metal ion and heavy metal ion from non-aqueous solution or non-aqueous solvent. Said invention is simple in preparation of product, and the adsorption volume of adsorbing acidic impurity from non-water is high, and its adsorption speed is high, its chemical property is stable. In the purification of lithium electrolyte by using said product the condition for removing impurity is moderate, at the same time of removing acidic impurity, the impurity into also can be removed.

To obtain a nonaqueous electrolyte secondary battery which has a high capacity and excellent storage characteristics at elevated temperatures. A nonaqueous electrolyte secondary battery having a positive electrode including a positive active material having a layered structure, a negative electrode including a negative active material, and a nonaqueous electrolyte including a lithium electrolyte salt and a solvent, wherein carbon dioxide is dissolved in the nonaqueous electrolyte, and the concentration of the lithium electrolyte salt in the nonaqueous electrolyte is 1.0 mol/liter or more, and the battery is charged in such a way that an end-of-charge potential of the positive electrode becomes 4.40 V (vs. Li/Li⁺) or more.

The invention relates to a three-dimensional nanometer linear pore carbon material. A thickness is 2-4 micron. The material has nanometer linear macropores, and a pore diameter is 80-120nm. The poresare overlapped to form a network structure. A mesopore with a 2-5nm size and a micropore below 2nm are arranged in the pore groove of each nanometer linear macropore. The macropores are generated through reducing and evaporating zinc oxide nanowires. The mesopores and the micropores are generated through activating the zinc oxide nanowires on macropore pipe walls. The material has advantages thatthrough activating cheap zinc oxide nanowires, three-dimensional hole structures which are connected are formed, which is good for the infiltration of an electrolyte; through a macropore-mesopore-micropore and other multistage pore channel structures, the specific surface area of a carbon material is increased; a miniature supercapacitor has a high area capacity and high cycle stability; a high-concentration bistrifluoromethane sulfonimide lithium electrolyte is used to expand the voltage window of a water system miniature supercapacitor and increase device energy density; and the technology is simple, cost is low and so on.

The invention discloses a preparation method for lead acid battery electrolyte, wherein the electrolyte activator comprises: deionized water, nickel sulfate, cobalt sulfate, aluminum sulfate, sodium sulfate, lithium iodide and lithium carbonate, and the electrolyte ingredients are prepared as follows: 5-10 parts by weight of a stabilizing agent, 6-13 parts by weight of colloidal silica, 5-12 parts by weight of analytically pure sulfuric acid, 20-30 parts by weight of pure water, and 2-5 parts by weight of the electrolyte activator. By using the electrolyte prepared by the method, the internal resistance of the lead acid battery can be reduced, and the capacity and the service life of the lead acid battery can be improved.

The invention relates to a pyrazole compound electrolyte additive. The structural formula of the additive is 1R<1>,3R<2>,4R<3>-pyrazole or 1R<1>,4R<2>,5R<3>-pyrazole, wherein each of R<1>, R<2> and R<3> is a linear or branched C1-4 structure. A lithium ion battery electrolyte includes a lithium salt, an organic solvent, the pyrazole compound and other functional additives, and the mass of the pyrazole compound is 0.1-10% of the mass of the lithium battery electrolyte. The pyrazole compound is beneficial for forming an interface film having a certain conductivity on the surface of a positive electrode, and can be used together with other positive electrode film forming additives to reduce the impedance of the surface of a positive electrode, so the safety performance of the lithium ion battery and the cycle performances under a high voltage are improved.

The invention provides a low-temperature electrolyte of lithium iron phosphate power battery and a preparation method thereof, and belongs to the technical field of lithium iron phosphate power batteries. The low-temperature electrolyte of the lithium iron phosphate power battery is prepared from 65 to 95 percent of organic solvent, 3 to 15 percent of additive and 0.7 to 1.4 mol/L of lithium salt. The preparation method comprises the following steps of: fully and uniformly mixing one or more selected organic solvents in a glove box at the humidity of below 1 percent for preparing electrolyte solution; adding the selected additive into the solution; finally adding the required lithium electrolyte salts into the solution; and when all the added lithium electrolyte salts are fully dissolved, standing for 30 to 40 hours to obtain the low-temperature electrolyte of the lithium iron phosphate power battery. The low-temperature electrolyte of the lithium iron phosphate power battery of the invention has the advantages of suitability for a low-temperature environment, rational component selection and matching, good low-temperature charging-discharging performance, magnification performance and cycling performance, simple preparation method and easy operation.

A lithium ion polymer electrolyte membrane and its preparation method and application relate to that field of solid electrolyte. The preparation method of the lithium ion polymer electrolyte membraneof the embodiment of the invention is that the sulfonated poly (phosphodiazole) stock solution is solidified to obtain the sulfonated poly (phosphodiazole) film, and the sulfonated poly (phosphodiazole) film is reacted with lithium salt to obtain the poly (phosphodiazole) sulfonate lithium electrolyte membrane; and the sulfonated poly (phosphodiazole) film is solidified to obtain the sulfonated poly (phosphodiazole) film; or preparing lithium poly (1, 2-diazole sulfonate) solution by sulfonated poly (1, 2-diazole sulfonate) stock solution and lithium salt, and coagulating to form membrane to obtain poly (1, 2-diazole sulfonate) lithium electrolyte membrane. The method is simple and easy to operate. The poly (phthalazinesulfonic acid) lithium electrolyte membrane of the embodiment of the invention has high room temperature ionic conductivity, good electrochemical stability, flame retardancy and excellent heat resistance; a lithium ion polymer electrolyte membrane accord to an embodimentof that present invention is used as a solid-state electrolyte membrane of a solid-state lithium battery.

The invention relates to a lithium ion battery. The lithium ion battery comprises an anode, a cathode and a lithium electrolyte, wherein the lithium electrolyte is contacted with the anode and the cathode; the cathode is provided with a graphene multi-layer structure; the graphene multi-layer structure comprises a plurality of two-dimensional flake graphene layers and a plurality of metal nickel layers staggered among the two-dimensional flake graphene layers; and the lithium ions are fully embedded into or separated from the space among the layers of the graphene layers.

The invention belongs to the technical field of lithium ion batteries, and provides a lithium supplementing composition which comprises a lithium supplementing compound and a cosolvent, and the lithium supplementing compound is lithium nitride and/or lithium oxalate; and the cosolvent is at least one of tris (pentafluorophenyl) borane, tris (pentafluorophenyl) phosphine and tris (pentafluorophenyl) silane. After the lithium supplementing composition is used for the lithium supplementing electrolyte, the lithium supplementing electrolyte has high lithium supplementing activity, the problems oflow initial coulombic efficiency and poor cycle performance of the silicon-based negative electrode lithium ion battery can be effectively solved, and the energy density of the lithium ion battery isobviously improved. Meanwhile, the invention also provides a lithium supplementing method based on the lithium supplementing electrolyte.

The invention relates to the field of lithium battery recovery, in particular to a method for recycling a retired lithium battery negative electrode material. The method comprises the following steps:dipping a negative electrode material obtained by disassembling a retired lithium battery into an N-methyl pyrrolidone solution, and standing until a copper foil is separated from a graphite matrix,so as to obtain a pre-sheet; placing the pre-sheet as a negative plate in a lithium electrolyte for discharge treatment, and removing residual impurities on the surface of the pre-sheet to obtain graphite flakes; and crushing and ball-milling the graphite flakes into graphite powder, and recycling graphene oxide through an oxidation stripping method. According to the invention, the retired lithiumpower battery negative electrode material can be reasonably and effectively utilized; single-layer graphene powder with relatively high quality can be prepared by adopting a proper process; and greateconomic benefits can be generated.

The invention relates to a recycling method of power lithium-ion batteries. The method comprises the following steps of (S1) firstly discharging the recycled power lithium-ion batteries to corresponding minimum standard voltage according to the batteries of different material systems; (S2) opening battery injection openings and injecting a lithium hexafluorophosphate electrolyte; (S3) after the electrolyte completely infiltrates, carrying out charging formation by using predetermined current; and (S4) finally sealing the openings and dividing the capacity. According to the manufactured lithium-ion batteries, through a test at a room temperature of 25 DEG C, the initial capacity is improved by over 10% in comparison with the capacity of each battery before being recycled; the capacity retention ratio after 300 IC current charge and discharge cycles is greater than 85% of the initial capacity; normal use in the industries, with low power performance requirements, of an energy storage power supply, daily digital and household appliances, lamps and the like can be met; and stepwise reuse of the lithium-ion batteries eliminated from the power industries of electric vehicles, electric bicycles, model airplanes, electric tools and the like is achieved.