654 results about "Lithium sulfide" patented technology

Batteries including a lithium anode stabilized with a metal-lithium alloy and battery cells comprising such anodes are provided. In one embodiment, an electrochemical cell having an anode and a sulfur electrode including at least one of elemental sulfur, lithium sulfide, and a lithium polysulfide is provided. The anode includes a lithium core and a ternary alloy layer over the lithium core where the ternary alloy comprises lithium and two other metals. The ternary alloy layer is effective to increase cycle life and storageability of the electrochemical cell. In a more particular embodiment, the ternary alloy layer is comprised of lithium, copper and tin.

The invention discloses a lithium-sulphur battery anode material, which adopts the technical scheme that elemental sulphur or lithium sulfide is loaded into one or various carrier materials to form a novel composite electrode for a lithium-sulphur battery. The carrier material (s) is (are) characterized in that within the operation voltage range of the elemental sulphur or the lithium sulfide, the carrier material (s) is (are) also provided with electrochemical activity, that is, is (are) provided with considerable lithium storage capacity, and simultaneously has (have) characteristics of high specific surface and high porosity. The invention also discloses a preparation method of the lithium-sulphur battery anode material. The system of the electrode solves problems that the carrier material of a conventional lithium-sulphur battery anode material is not provided with the electrochemical activity and is low in composite material specific capacity within the operation voltage range of the elemental sulphur or the lithium sulfide, and the integral specific capacity of the composite electrode and the energy density of the lithium-sulphur battery are improved.

The invention provides a lithium sulfide-porpous carbon compound positive material for a lithium ion battery and a preparation method thereof. The positive material is formed by compounding lithium sulfide and ordered porous carbon, wherein the mass fraction of the lithium sulfide in the compound material is 20-80%; and the lithium sulfide exists in the pore spaces of the porous carbon. The preparation method comprises the following steps: firstly, carrying out ball milling on the ordered porous carbon and sulfur in the presence of inert gas; then carrying out thermal processing on the milled mixture at the temperature of 145-155 DEG C so that the sulfur fully is dispersed into the porous carbon; and finally, reacting lithium with the sulfur so as to generate the lithium sulfide by a chemical or electrochemical method, thereby obtaining the positive material provided by the invention. According to the invention, the preparation process is simple, and the raw material source is wide; the prepared positive material is used in a mode of pre-embedding lithium in a positive electrode, metal lithium is not required to serve as a negative electrode, and a carbon negative electrode, a silicon negative electrode and the like are used, thereby improving the safety performance and the assembling performance; the positive material has the advantages of good conductivity, high capacity and good circulation performance; and the positive material has a wide application prospect and the preparation method is suitable for industrial production.

A chemical source of electrical energy may include a positive electrode (cathode) made of an electrically conductive material, a mixture of lithium sulphide and sulphur, a permeable separator or membrane, and a negative electrode (anode) made of an electrically conductive material or a material that is able reversibly to intercalate lithium ions, wherein an aprotic electrolyte comprising at least one lithium salt in at least one solvent is provided between the electrodes.

The present invention provides a method of efficiently producing a lithium ion conductive inorganic solid electrolyte having high ionic conductivity, including: conducting a melt reaction of lithium sulfide containing 0.15 mass % or less of each of a lithium salt of sulfur oxide and lithium N-methylaminobutyrate, and one or more components selected from diphosphorus pentasulfide, elemental phosphorus, and elemental sulfur; rapidly cooling the resultant; and subjecting the resultant to heat treatment, and a high-performance lithium battery using the electrolyte. In particular, the present invention provides a high-performance lithium battery having high energy density, which is obtained by using a positive electrode active material having an operating potential of 3 V or more, a negative electrode active material having a reduction potential of 0.5 V or less, and a lithium ion conductive inorganic solid electrolyte in contact with at least the negative electrode active material, the lithium ion conductive inorganic solid electrolyte being produced from lithium sulfide and one or more components selected from diphosphorus pentasulfide, elemental phosphorus, and elemental sulfur, and which can be used as a monolayer.

The invention discloses a metal monoatom-doped carbon nanomaterial catalytic carrier, and a preparation method and application thereof. The metal monoatom-doped carbon nanomaterial catalytic carrier comprises a nitrogen-containing carbonaceous core-shell structure formed by coating a carbonaceous core with a nitrogen-containing carbon shell and metal monoatoms distributed in the nitrogen-containing carbonaceous core-shell structure. The metal monoatom-doped carbon nanomaterial catalytic carrier provided by the invention has rich porous structures, a high specific surface area, strong polysulfide ion adsorption capacity and an electrochemical catalysis function. When the metal monoatom-doped carbon nanomaterial catalytic carrier is applied as a lithium sulfide positive-electrode carrier, asecondary battery is allowed to achieve rapid activation (0.1 C) at a low cut-off voltage (3 V); an electrode structure can ensure the structural stability of the nanomaterial during electrochemical cycles, and high and prominent electrochemical cycle stability is obtained; the utilization rate of the active material of the battery is significantly improved; the overall electrochemical performanceof the battery is greatly improved; and the battery can be quickly charged and discharged.

The invention provides a preparation method of a sulfide electrolyte material as shown in a formula (I). The preparation method comprises the steps of mixing lithium sulfide, phosphorus pentasulfide and an organic solution to obtain a mixed solution; stirring, centrifuging, filtering and drying the mixed solution sequentially to obtain an initial material; performing heat treatment on the initial material to obtain the sulfide electrolyte material as shown in the formula (I). In the preparation process of the sulfide electrolyte material, lithium sulfide and phosphorus pentasulfide are dissolved into an organic solvent and react to form a compound containing Li, P and S, the compound and the organic solvent form a crystalline state, and then centrifuging, filtering, drying and heat treatment processes are performed sequentially to obtain the sulfide electrolyte material, so that the preparation method of the sulfide electrolyte material, provided by the invention, is simple and easy to operate.

The invention provides a sulfide solid electrolyte based on oxygen doping. The sulfide solid electrolyte is prepared from the chemical ingredients, in percentage by mass: 36-60% of lithium sulfide orlithium selenide, 18-48% of phosphorus pentasulfide or phosphorus selenide, 1-23% of metal oxide or specific nonmetallic oxide and 8-37% of lithium chloride, lithium bromide or lithium iodide. The preparation method of the sulfide solid electrolyte mainly comprises the steps that the raw materials are sufficiently blended and subjected to tabletting, then placed in a quartz tube to be burned and sealed, the product is placed in a muffle furnace and heated to be 400-600 DEG C at a slow heating rate, the optimal heating rate is 0.3 DEG C/minute, heat preservation is conducted for 12-48 hours, and then the product is cooled to reach the room temperature; and the product is ground to be powder, and the sulfide solid electrolyte based on oxygen doping is prepared. The sulfide solid electrolyteis easy to prepare and high in repeatability, the prepared solid electrolyte has the high ionic conductivity and good stability to the air and positive and negative electrodes.

The invention discloses a preparation method of lithium sulfide powder. The preparation method comprises the following steps: (1) drying sulfur powder; (2) under inert atmosphere protection, mixing the dried sulfur powder with lithium hydride powder in a mole ratio of 1:(1-3), adding the obtained mixture into a sealed ball-milling tank, and carrying out ball-milling on the mixture for 1-24 h under the condition that the rotating speed is 100-500 r/min at room temperature; and (3) after the ball-milling reaction is completed, under inert atmosphere, taking the powder out of the ball-milling tank, so that the lithium sulfide powder is obtained. The preparation method of lithium sulfide powder disclosed by the invention has the characteristics of simple process, low cost, and easiness for industrialized production.

The invention relates to an MXene/lithium sulfide/carbon composite cathode material and a preparation method of the MXene/lithium sulfide/carbon composite cathode material. The method comprises the following steps: (1) etching an MAX phase powder with an acid, filtering, washing and drying to obtain an MXene nanometer material with a porous structure; (2) preparing a solution from lithium sulfate,proportionally mixing with a carbon material or a carbon precursor, preparing a carbon/lithium sulfate or carbon precursor/lithium sulfate composite material; (3) heating the carbon/lithium sulfate or carbon precursor/lithium sulfate composite material in the step (2) under the protective atmosphere, reducing the above composite material into a lithium sulfide/carbon material by means of thermalreduction; (4) mixing the MXene nanometer material with the porous structure obtained in the step (1) with the lithium sulfide/carbon in the step (3), and ball-milling to obtain the MXene/lithium sulfide/carbon composite cathode material. Compared with the prior art, the prepared MXene/lithium sulfide/carbon composite cathode material has the advantages of high electrical conductivity, high specific capacity, good cycle performance, good rate capability, simple preparation process and the like.

A process for the production of a lithium transition metal sulphide such as lithium iron sulphide, the process comprising reacting a transition metal sulphide with lithium sulphide in a solvent comprising a molten salt or a mixture of molten salts. Lithium transition metal sulphides obtained using this process are useful in the production of electrodes, in particular for rechargeable lithium batteries.

The invention relates to a lithium-sulfur battery composite positive electrode material and a preparation method thereof. The positive electrode material consists of following components by weight percent: 30-59.4% of a conductive agent with a mesoporous structure, 40-60% of sulfur and 0.1-10% of a modifying agent, wherein sulfur is dispersed into holes of the conductive agent, and the modifying agent is connected with the holes of the conductive agent through a chemical bonding manner. The preparation method comprises the steps of pouring sulfur into the conductive agent by adopting a molten suction method so as to obtain a conductive agent/sulfur composite material; and then modifying the obtained conductive agent/sulfur composite material to obtain the lithium-sulfur composite positive electrode material. According to the composite positive electrode material, not only can the good high-rate stability be realized, but also the loss of active substances and the influences of corrosion to a lithium negative electrode, rapid capacity fading and the like caused by the 'shuttle effect' due to dissolution of lithium sulfide can be effectively reduced, and the cycle performance of the lithium-sulfur battery can be obviously improved.

The invention discloses a lithium sulfide/carbon composite nanometer material and a preparation method and application thereof. In a relatively typical embodiment, the method comprises the steps of fully mixing lithium sulfate and a carbon material precursor or a carbon material, and performing thermal treatment, wherein the thermal treatment condition comprises a temperature rising rate of 1-20 DEG C per minute, a constant temperature of 600 to 1000 DEG C for 2-12 hours in an inert atmosphere; and natural cooling of the material to a room temperature to acquire the lithium sulfide/carbon composite material. The invention provides a process for synthesizing the lithium sulfide/carbon nanocomposite material by reducing lithium sulfate with carbon, the process is simple and easy to operate, is high in controllability and low in cost, the raw materials are low in price and easy to get, moreover, the obtained product is the lithium sulfide/carbon nanocomposite material which is uniformly dispersed, has good performance and is controllable in morphology, the lithium sulfide/carbon nanocomposite material comprises a one-dimensional nanometer fiber, a two-dimensional nanosheet and the like, and the lithium sulfide/carbon nanocomposite material is high in conductivity and can be widely applied to an electrochemical energy storage device such as a lithium-sulfur battery.

The invention relates to a composite electrode material for a lithium-sulfur battery anode and a preparation method thereof. The composite electrode material is composed of a carbon material and lithium sulfide. The electrode material takes the compound of lithium sulfide and the carbon material as the substrate, the carbonization reaction of a carbon-containing compound is utilized to generate a carbon layer on the substrate surface, the lithium sulfide is sealed and coated in the pore channels of carbon, and the mass fraction of lithium sulfide in the composite electrode material is 40%-89%. The lithium-sulfur battery anode material prepared by the method can effectively avoid dissolution and diffusion of polysulfides in a charge-discharge process, thereby improving the cyclic stability and capacity of the battery.

The invention relates to a method for preparing a lithium carbide/lithium sulfide (Li2S) composite anode material of a lithium-sulfur battery by performing carbon thermal reduction on lithium sulfate (Li2SO4), and belongs to the technical field of lithium-sulfur batteries. The lithium carbide/lithium sulfide composite material is prepared by performing the carbon thermal reduction on a lithium sulfate-containing composite material serving as a precursor under a condition of inert atmosphere protection, and is applied to an anode of the lithium-sulfur battery. The lithium sulfide composite material preparation method disclosed by the invention is a novel method for in-situ synthesis of the anode material of the lithium-sulfur battery; and the prepared lithium carbide/lithium sulfide composite material is high in active substance dispersivity and stable in structure, and has the advantages of high specific capacity, excellent circulating and rate capability and the like when used as an anode material of the lithium-sulfur battery. The method is easy to operate, low in preparation cost and favorable for large-scale production.