637 results about "Electrochemical window" patented technology

The invention relates to organic-inorganic all-solid-state composite electrolyte as well as preparation and application methods thereof, belonging to the field of lithium ion batteries. According to the organic-inorganic all-solid-state composite electrolyte, a highly-ordered three-dimensional connection network skeleton is formed by an inorganic fast lithium ion conductor, and a three-dimensional connection network is filled with a polymer and lithium salt. The organic-inorganic all-solid-state composite electrolyte which is flexible and has a controllable three-dimensional connection network structure is prepared. The electrolyte is high in lithium ion conductivity, wide in electrochemical window, good in mechanical property and stable to lithium metal. A lithium ion secondary battery assembled by a composite electrolyte membrane prepared by the method is high in capacity, stable in cycle performance, low in interface impedance and good in interface stability.

This invention generally relates to electrochemical cells utilizing magnesium anodes, new solutions and intercalation cathodes. The present invention is a new rechargeable magnesium battery based on magnesium metal as an anode material, a modified Chevrel phase as an intercalation cathode for magnesium ions and new electrolyte solution from which magnesium can be deposited reversibly, which have a very wide electrochemical window. The Chevrel phase compound is represented by the formula Mo6S8-YSeY in which y is higher than 0 and lower than 2 or by the formula MXMo6S8 in which M is selected from the group comprising of copper (Cu), nickel (Ni), silver (Ag) and/or any other transition metal; further wherein x is higher than 0 and lower than 2.

The invention relates to solid-state electrolytes, in particular to a polycarbonate all-solid-state polymer electrolyte, an all-solid-state secondary lithium battery made of the same and preparation and application thereof. The all-solid-state polymer electrolyte is prepared from polycarbonate macromolecules, lithium salt and a porous supporting material; the thickness is 20-800 micrometers, the mechanical strength is 10-80 MPa, the room temperature ion conductivity is 2*10<-5>S/cm-1*10<-3>S/cm, and the electrochemical window is higher than 4V. The all-solid-state polymer electrolyte is easy to prepare and form, good in mechanical property, high in ion conductivity and wide in electrochemical window; meanwhile, the solid-state electrolyte effectively inhibits growth of negative electrode lithium dendrites and improves interface stability and long circulation performance.

The invention discloses a high voltage-resistant multi-stage structure composite solid-state electrolyte and its preparation method and use in a solid-state lithium battery. The lithium battery utilizes a multi-stage structure solid-state electrolyte containing different components. A polymer electrolyte with excellent electrode interface compatibility is used as an electrolyte in the negative electrode side. A high voltage-resistant polymer electrolyte is used as an electrolyte in the positive electrode side. A polymer electrolyte or an inorganic electrolyte with high ionic conductivity is used as a middle layer. The multi-stage structure solid-state electrolyte has advantages such as high mechanical properties, high ionic conductivity, a wide electrochemical window, excellent electrode interfacial compatibility and lithium dendrite growth inhibition of different components. Compared with the traditional liquid lithium ion battery, the battery with the multi-stage composite solid-state electrolyte has higher safety and higher energy density.

The present invention provides a synthesis method of LiB (C2O4)2. It belongs to the field of lithium borate through, and can be used in lithium cell. Said invention adopts solid-phase synthesis method, and includes the following steps: ball-grinding and mixing reaction raw material lithium compound, borno compound and oxalic acid radical compound according to mole ratio of 1:1:2, ball-grinding temperature is 5 deg.C-70 deg.C and ball-grinding time is 1-4 hr., then heating ball-ground raw material to make it produce chemical reaction, its reaction environment is nitrogen gas, argon gas or vacuum environment, its reaction temp. is 80 deg.C-300 deg.C and reaction time is 2-24 hr, so as to obtain LiB(C2O4)2.

The invention relates to an aluminium ion battery and a preparation method thereof and belongs to the field of aluminium ion batteries and preparation thereof. The aluminium ion battery comprises a positive electrode, a negative electrode and an aluminium ion electrolyte, wherein the positive electrode is made of transition metal oxide; the negative electrode is made of high purity aluminium; the battery comprises a diaphragm material when the aluminium ion electrolyte is in a liquid state. Since abundant aluminium elements are stored, the cost for the ion battery is greatly reduced; the safety performance is improved; the transition metal oxide is applicable to hypervalent ion batteries due to relative stability under the variable valence states and different valence states. The ion liquid serves as the electrolyte for the hypervalent ion battery, so that aluminium ion is high in conductivity, good in heat stability, broad in electrochemical window and high in chemical stability and almost incapable of reacting with the positive electrode materials, the negative electrode materials, a current collector, a binder and a diaphragm in a battery system and capable of maintaining the liquid state in a board temperature range. The aluminium ion battery can be applied to various fields, such as electronic industries, communication industries and electric vehicles and the like.

A rechargable magnesium battery having an non-aqueous electrolyte is provided. The properties of the electrolyte include high conductivity, high Coulombic efficiency, and an electrochemical window that can exceed 3.5 V vs. Mg/Mg⁺². The use of the electrolyte promotes the electrochemical deposition and dissolution of Mg without the use of any Grignard reagents, other organometallic materials, tetraphenyl borate, or tetrachloroaluminate derived anions. Other Mg-containing electrolyte systems that are expected to be suitable for use in secondary batteries are also described.

Disclosed is a chargeable water-system zinc ion battery with long cycle life and high energy density. The chargeable water-system zinc ion battery comprises a positive electrode shell, an elastic sheet, a gasket, a positive electrode active substance, a diaphragm, a negative electrode active substance and a negative electrode shell, and all the components form a laminated layer structure in sequence, wherein the positive electrode active substance is positive ion defect type ZnMn<x>O<4>/C nanocomposite; the negative electrode is zinc foil or spherical zinc powder; the diaphragm is polyethylene nonwoven fabric or filter paper; and the electrolyte is a zinc trifluoromethanesulfonate water solution. The chargeable water-system zinc ion battery has the advantages that the ZnMn<x>O<4>/conductive carbon composite electrode material has simple and easily feasible preparation process; the synthesized ZnMn<x>O<4> nano crystals are uniformly embedded in the conductive carbon; due to the electrolyte, the Zn deposition/separation-out coulombic efficiency can reach about 100% and a wide electrochemical window of 0-2.5Vvs.Zn<2+>/Zn is realized; the positive electrode active substance and the novel electrolyte are applied to the water-system zinc ion battery, so that the battery shows a good electrochemical performance; and meanwhile, the battery has high reversible zinc storage capacity with high active substance content, and excellent cycling stability .

The invention discloses a composite solid-state polymer electrolyte and an all-solid-state lithium battery. The composite solid-state polymer electrolyte comprises organic micro-nano porous granules, a polymer having lithium ion conducting capability and a lithium salt; the composite solid-state polymer electrolyte takes the organic micro-nano porous granules as filler; and natural compatibility exists between the organic filler and the polymer matrix. The composite solid-state polymer electrolyte disclosed by the invention has high electrochemical window (4.2-5V), excellent interface stability with a lithium-based negative electrode material, and low interface impedance. The all-solid-state lithium battery, assembled by the composite solid-state polymer electrolyte disclosed by the invention, is high in cycling performance and rate capability.

The invention discloses a manganese dioxide electrochemical supercapacitor, comprising the following steps: the pseudocapacitance of the manganese dioxide and a double electrode layer capacitance mechanism of large specific surface area carbon material are combined into a maintaining power, the positive electrode adopts manganese dioxide material with high capacity, the negative electrode adopts high large specific surface area carbon material, an aqueous solution system or a non-aqueous solution system containing bivalent cations, thus forming the asymmetric electrochemical capacitor. As different materials are adopted in different electrochemical windows of the same electrolyte, individual voltage of the asymmetric electrochemical capacitor can be up to 2V or more, and as the bivalent cations are adopted as the cations of the electrolyte, the specific capacity of the positive electrode and the negative electrode are improved; therefore, the supercapacitor is characterized of high energy density and high power density, etc.

The invention designs a method for preparing nanometer aluminum or nanometer aluminum coating in an electro-deposition form by using an ion liquid/additive system. The method is characterized in that: ion liquid and anhydrous aluminum trichloride are mixed into a low-temperature electrolyte and suitable additives are added for preparing the ion liquid/additive system. A processed substrate is taken as a deposition cathode; the direct current electro-deposition is adopted for preparing the nanometer aluminum or nanometer aluminum coating; and the size of the aluminum grains is adjusted according to requirements. According to the method, the problems of high cost and small output of the present technology for producing the nanometer aluminum are solved; the adopted ion liquid is conventional ion liquid and is characterized by wide source, low cost, high conductivity, wide electrochemical window and being non-volatile and environment-friendly; the suitable additives are used, so that the high-quality nanometer aluminum or nanometer aluminum coating obtained in the conventional ion liquid is realized; the obtained aluminum deposited coating is compact, smooth and flat; a nanometer material can be obtained by using the ion liquid/additive system at lower temperature; the reaction is easy to control; the energy consumption is low; the obtained nanometer aluminum is high in quality and high in current efficiency; the size of the nanometer aluminum can be effectively controlled by adjusting the dosage and formula of the additives; the process is simple; the cost is low; and the application prospect is better.

The invention discloses a method for preparing binary or ternary fluorine-containing sulfimide alkali metal salts, a method for preparing ionic liquid by the binary or ternary fluorine-containing sulfimide alkali metal salts, and applications of the alkali metal salts and ionic liquid as electrolytes in carbon-based super capacitors, secondary lithium (ion) batteries, and the like. The method for preparing the binary or ternary fluorine-containing sulfimide alkali metal salts provided by the invention is short in operation steps, easy for product separation and purification, and high in product yield and purity; the binary or ternary fluorine-containing sulfimide lithium provided by the invention has good thermal stability and hydrolysis resistance; a nonaqueous electrolytic solution of the binary or ternary fluorine-containing sulfimide lithium has high conductivity and lithium ion transference number, and also exhibits good oxidation resistance and good compatibility with widely-used electrode materials; meanwhile, the ionic liquid containing the binary or ternary fluorine-containing sulfimide anions exhibits the properties of low viscosity and high conductivity, and has a wide electrochemical window.

The method includes following step: two monomers are mixed according to the ratio of 1.0 to 1.0-9.0; then it mixes with thermal booster and liquid lithium ion battery solution to form the fore body of gel polymer dielectric; the fore body is injected into half finished battery. the half finished battery is vacuumized and sealed; the half finished battery is made thermal polymerization reaction, and the gel polymer dielectric is obtained.

The invention provides a lithium ion battery electrolyte and a secondary battery containing the lithium ion battery electrolyte, and relates to the technical field of electrochemistry. The lithium ion battery electrolyte contains a lithium salt, an organic solvent, 0.5-5% by weight of a film-forming additive, 1-15% by weight of a fluorobenzene compound, 0.01-0.5% of a wetting agent, and 0.01-2% of a stabilizer. The lithium ion secondary battery comprises a positive electrode material, a negative electrode material and an electrolyte, wherein the positive electrode material comprises, by mass, 85% of LiCoO2, 7.5% of polyvinylidene fluoride (PVDF) and 7.5% of conductive carbon black SP, and the negative electrode material comprises, by mass, 90% of high compactness graphite, 7% of polyvinylidene fluoride (PVDF) and 3% of conductive carbon black SP. According to the present invention, the battery capacity can be increased, the charge/discharge cycle performance can be improved, and the electrochemical window can be widened.

The preparation method of an all-solid-state polymer electrolyte comprises the following steps: adding a carbonic acid structure crosslinking agent, a polyether structure monomer, an olefine acid monomer and a functional polymer together with a solvent into a reactor for stirring to form a uniform precursor solution; Adding an initiator, a lithium salt, an inorganic filler and/or a fast ionic conductor to the precursor solution, stirring to obtain a mixed solution, uniformly coating the mixed solution on a mold, evaporating the solvent, and initiating a reaction under an inert gas; At that endof the initiation reaction, vacuum dry is carried out to obtain an all-solid polymer electrolyte. As that carbonate polyalkenyl structure monome is used as a crosslink agent, the polyether monomer and the olefine acid monomer are crosslinked and copolymerize, and the electrochemical window of the all-solid-state polymer electrolyte can be effectively improved by introducing the carbonate crosslinking structure, and the all-solid-state polymer battery with higher energy density and a better application range can be assembled.

The invention discloses a high-salinity non-aqueous electrolyte. The high-salinity non-aqueous electrolyte comprises a lithium salt and a non-aqueous organic solvent, and the concentration of the lithium salt is 2-10mol/L. The invention also discloses a use of the high-salinity non-aqueous electrolyte in a lithium or sodium cell system. The high-salinity non-aqueous electrolyte has the advantages of high thermal stability, low volatility, high safety, electrochemical widow and aluminum foil corrosivity, and lithium or sodium dendrite overcoming.

Disclosed is a secondary battery comprising a cathode, an anode, a separator and an electrolyte, wherein the electrolyte comprises: (a) a eutectic mixture; and (b) a first compound reduced at a higher potential vs. lithium potential (Li/Li+) than the lowest limit of the electrochemical window of the eutectic mixture. The electrolyte uses a eutectic mixture in combination with an additive reduced in advance of the eutectic mixture upon the initial charge to form a solid electrolyte interface (SEI) layer. Therefore, the electrolyte can solve the problem of electrolyte decomposition occurring when using a eutectic mixture alone as an electrolyte for a battery, and thus can prevent degradation of the quality of a battery.

The invention discloses a composite solid electrolyte. The composite solid electrolyte comprises a first solid electrolyte layer and a second solid electrolyte layer; the first solid electrolyte layeris a polymer solid electrolyte layer; the second solid electrolyte layer comprises a polymer solid electrolyte and an inorganic solid electrolyte; the mass amount of the second solid electrolyte layer accounts for 50 to 90% of that of the composite solid electrolyte; the mass amount of the inorganic solid electrolyte layer accounts for 10 to 70% of that of the second solid electrolyte layer. Theinvention also discloses a preparation method and applications of the composite solid electrolyte. The composite solid electrolyte possesses the advantages of the inorganic solid electrolyte and the polymer solid electrolyte; the conductivity is high; the electrochemical window is wide; lithium dendrite growth can be inhibited effectively; metal cathode efflorescence is avoided; the preparation method is simple, and is convenient for industrialized production.

The invention relates to preparation for a self-crosslinking compound solid electrolyte and an all-solid lithium ion battery composed of the self-crosslinking compound solid electrolyte and relates tothe field of the electrolyte of the lithium ion battery. Specifically, a compound solid electrolyte is prepared according to the following steps: adopting silane terminated polyether (MS) as a prepolymer and then stirring and uniformly mixing with inorganic nano-particles with acidity and alkalinity or organic polymer materials, conductive lithium salt and organic solvents, and preparing the compound solid electrolyte through the self-crosslinking curing of MS and inorganic nano-particles with acidity and alkalinity or organic polymer materials. The self-crosslinking compound curing of MS andinorganic nano-particles with acidity and alkalinity or organic polymer materials is capable of reducing the degree of crystallinity of the compound solid electrolyte, promoting the ionic conductivity, ion transference number, mechanical properties, electrochemical stability window and battery rate charge-discharge properties of the compound solid electrolyte and solving the problem of interfacecontact of the solid lithium ion battery. The ionic conductivity can reach up to 10<-4>Scm<-1>, the electrochemical window is above 5V, the shrinking rate of the product is low and the electrochemicalstability is high.

The invention discloses alkali metal salts of binary or ternary fluorine-containing sulfimide, a method for preparing ionic liquid from the alkali metal salts of binary or ternary fluorine-containing sulfimide, and applications of the alkali metal salts and the ionic liquid as electrolytes in carbon-based supercapacitors, secondary lithium (ion) batteries, and the like. The method for preparing the alkali metal salts of binary or ternary fluorine-containing sulfimide provided by the invention is short in operation steps, and the product is easy to separate and purify, and very high in yield and purity; the binary or ternary fluorine-containing lithium sulfimide provided by the invention is good in thermal stability and hydrolysis resistance; the non-aqueous electrolyte has high conductivity and lithium ion transport number, exhibits good oxidation resistance, and has good compatibility with widely-used electrode materials; meanwhile, the ionic liquid containing binary or ternary fluorine-containing sulfimide anions is characterized by low viscosity and high conductivity, and has a wide electrochemical window.

The invention discloses a lithium single ion conduction polymer electrolyte based on functionalized lithium borate. A double-bond-containing functionalized lithium borate and a sulfydryl-containing compound are subjected to an alkene-sulfydryl click reaction, or the double-bond-containing functionalized lithium borate and the sulfydryl-containing compound and a double-bond-containing polyether are subjected to a poly-alkene-sulfydryl click reaction to prepare a linear or network-shaped all-solid-state or gel catalyst. The lithium single ion conduction polymer electrolyte prepared by the invention has the advantages of simple and easily implemented synthesis, low-cost and easily available raw materials, high room-temperature conductivity, high lithium ion mobility, wide electrochemical window, and the like; and a lithium battery assembled by the electrolyte provided by the invention has high safety, high rate capability, long cycle life and stability.

An electrolyte for use in electrochemical cells is provided. One type of non-aqueous Magnesium electrolyte comprises: at least one organic solvent; at least one electrolytically active, soluble, inorganic Magnesium salt complex represented by the formula: Mg_nZX_3+(2*n), in which Z is selected from a group consisting of aluminum, boron, phosphorus, titanium, iron, and antimony; X is a halogen and n=1-5. The properties of the electrolyte include high conductivity, high Coulombic efficiency, and an electrochemical window that can exceed 3.5 V vs. Mg/Mg⁺² and total water content of <200 ppm. The use of this electrolyte promotes the electrochemical deposition and dissolution of Mg from the negative electrode without the use of any additive. Other Mg-containing electrolyte systems that are expected to be suitable for use in secondary batteries are also described. Rechargeable, high energy density Magnesium cells containing a cathode, an Mg metal anode, and an electrolyte are also disclosed.