949 results about "Aqueous electrolyte" patented technology

The invention provides a non-aqueous electrolyte, a lithium ion battery, a battery module, a battery pack and a power utilization device, the non-aqueous electrolyte comprises a lithium salt, an organic solvent and an electrolyte additive, and the electrolyte additive comprises 1, 3-propane sultone, fluoroethylene carbonate, vinylene carbonate, lithium tetrafluoroborate and a compound I shown in the formula I. The non-aqueous electrolyte is applied to the lithium ion battery, and the cycle life of the lithium ion battery is prolonged.

The invention belongs to the technical field of thermoelectricity, and relates to a preparation method and application of a quasi-solid thermoelectric material capable of realizing humidity stability by means of phase separation regulation, the preparation method comprises the following steps: dissolving a negatively charged hydrophilic monomer, an electrically neutral monomer, a cross-linking agent and a photoinitiator in a solvent to obtain a precursor solution, and carrying out an ultraviolet polymerization reaction to form polyelectrolyte gel; mixing the eutectic solvent with an electrolyte aqueous solution containing redox ion pairs and lithium chloride to obtain a quaternary electrolyte system; and immersing the gel into a quaternary electrolyte system, and fully replacing the internal solution through a diffusion effect to obtain the quasi-solid thermoelectric material with stable humidity. The thermoelectric material has the advantages of excellent Seebeck coefficient, good stability, high mechanical strength, large power density and the like, can supply power to wearable electronic products in an actual humidity fluctuation environment, breaks through the main bottleneck of actual application of quasi-solid ionic thermoelectric materials based on ionized water gel, and is wide in application prospect.

The invention provides a non-aqueous electrolyte, a lithium ion battery, a battery module, a battery pack and an electric device. The non-aqueous electrolyte comprises a lithium salt, a non-aqueous organic solvent and a functional additive, and the functional additive comprises a bis-sulfinyl ester structure as shown in a formula I in the specification. When the non-aqueous electrolyte is used in the lithium ion battery, the wettability of the electrolyte can be effectively enhanced, the ionic conductivity of the electrolyte is improved, the low-temperature discharge capacity of the electrolyte is improved, and the stability of the electrolyte under high-temperature and high-voltage conditions is improved; and thus, the discharge capability and the service life of the lithium ion battery in high-temperature storage and high-temperature circulation are improved.

This invention relates to a biomass-based gel electrolyte membrane, its preparation method, and its application. The method includes preparing regenerated cellulose using a sol-gel method, adding sodium alginate and zinc chloride solution, and rapidly constructing a biomass-based composite gel electrolyte with a dual-network structure through metal ion coordination crosslinking. The biomass-based gel electrolyte membrane is obtained by adsorbing an aqueous electrolyte onto a gel membrane with a dual-network structure. This gel electrolyte membrane is then assembled with a zinc anode and a vanadium pentoxide cathode to obtain a zinc-ion battery. This invention features a simple method, readily available and inexpensive raw materials, easy product molding, convenient operation and control, and is conducive to industrial production. The prepared composite gel electrolyte membrane has a dual-network structure, exhibiting good stability, liquid retention capacity, and ionic conductivity, and demonstrates excellent cycle capacity and lifespan when applied to aqueous zinc-ion batteries.

The invention discloses a high-cycle-performance aqueous battery, which comprises an aqueous electrolyte, a negative electrode, a first positive electrode and a second positive electrode, wherein the first positive electrode and the second positive electrode are positioned on two sides of the negative electrode, and a first diaphragm and a second diaphragm are respectively arranged between the first positive electrode and the negative electrode and between the second positive electrode and the negative electrode; the battery is provided with an electromagnetic valve, the electromagnetic valve is electrically connected with the first positive electrode and the second positive electrode to control switching of the positive electrodes in the charging and discharging loop, and every time discharging and charging circulation are completed, the electromagnetic valve switches the electrode connection relation, and the first positive electrode and the second positive electrode are alternately connected into the charging and discharging loop. Switching of the two positive electrodes in the aqueous battery is accurately controlled through the electromagnetic valve, a positive-negative battery structure is formed in real time, the double positive electrodes alternately perform lithium removal-lithium intercalation reaction, excessive Li intercalation or insufficient positive electrode reduction caused by long-term charging and discharging of a single positive electrode is avoided, the structural stability of the positive electrode material is improved, and the service life of the battery is prolonged. The cycle life and the electrochemical performance stability of the aqueous battery are obviously improved.

The invention provides a polymer electrolyte, a secondary battery and a preparation method of the polymer electrolyte and the secondary battery. The non-aqueous electrolyte comprises an organic solvent, an electrolyte salt, a borate derivative with the mass fraction of 0.1%-15%, a sulfonyl-containing cross-linking agent A with the mass fraction of 0.1%-4%, a cross-linking agent B at least containing three carbon-carbon double bonds and an initiator, the mass ratio of the cross-linking agent B to the cross-linking agent A is (1-100): 1, the mass fraction of the borate derivative is 0.1%-15%, the mass fraction of the sulfonyl-containing cross-linking agent A is 0.1%-4%, and the mass fraction of the initiator is 0.1%-1%. The mass ratio of the sum of the mass of the borate derivative, the cross-linking agent A and the cross-linking agent B to the mass of the initiator is (1000-20): 1. The polymer electrolyte provided by the invention has high ionic conductivity, can improve the safety performance of a battery in a high proportion state, and can maintain good cycle performance at the same time.

The invention provides a non-aqueous electrolyte, a secondary battery and an electric device. The non-aqueous electrolyte comprises an additive, the additive comprises a cyclic sulfate compound with a structure as shown in a general formula (I), R1, R2, R3, R4, R5 and R6 are respectively and independently selected from any one of a group with a structure as shown in a general formula (II), a hydrogen atom, a halogen atom, C1-C6 alkyl, C1-C6 halogenated alkyl, C1-C6 alkoxy, C1-C6 halogenated alkoxy, C2-C6 alkenyl, C2-C6 ester group, cyano and sulfonic acid group, and R1, R2, R3, R4, R5 and R6 are respectively and independently selected from any one of hydrogen atom, halogen atom, C1-C6 alkyl, C1-C6 halogenated alkyl, C1-C6 alkoxy, C1-C6 halogenated alkoxy, C2-C6 alkenyl, C2-C6 ester group, cyano and sulfonic acid group. And n1, n2 and n3 are respectively and independently any integer from 0 to 2. The general formula (I) is a general formula (II).

The present application discloses a battery cell and a preparation method therefor, a battery, and an electric device. The battery cell comprises a positive electrode sheet, a negative electrode sheet, and an electrolyte. The electrolyte comprises a first non-aqueous electrolyte solution close to the positive electrode sheet and a second gel electrolyte close to the negative electrode sheet. The first non-aqueous electrolyte solution comprises a first solvent and a first lithium salt, and the first solvent comprises a nitrile-based solvent. The second gel electrolyte comprises a polymer layer and a second non-aqueous electrolyte solution accommodated in the polymer layer. The second non-aqueous electrolyte solution comprises a second solvent and a second lithium salt, and the second solvent comprises a linear monoether solvent. The battery cell has long cycle life and good rate performance.

The invention relates to the field of electrochemical energy storage, in particular to an aqueous zinc battery diaphragm based on mesoporous MOF and a preparation method and application thereof. The aqueous zinc battery diaphragm based on the mesoporous MOF has the capabilities of lightening and thinning, high wettability of an aqueous electrolyte, strong liquid retention, promotion of ion desolvation, acceleration of ion transmission and the like, is beneficial to realizing high utilization rate of a zinc negative electrode, and improves weight and volume energy density, rapid charge and discharge performance and long service life of an aqueous zinc battery; the obtained aqueous zinc battery diaphragm based on the mesoporous MOF is low in cost, and the battery cost can be effectively reduced; according to the invention, a mesoporous UIO-66 MOF functional group is used for regulating and controlling an ion coordination environment, pore channels bind water molecules to reduce water activity, an additive is cooperated for corrosion inhibition, corrosion of zinc dendrites and an electrode is accurately inhibited, interface compatibility is optimized, the problems of dendrites, corrosion, side reactions and the like in a water-based battery are effectively solved, and the service life of the water-based battery is prolonged. Therefore, the rate capability and the cycling stability of the battery are remarkably improved.

The invention provides a lithium secondary battery and a power utilization device. The lithium secondary battery comprises a non-aqueous electrolyte and a positive pole piece, the positive pole piece comprises a positive active material, the positive active material comprises LiNi < x > Co < y > Mn < z > M < 1-x-y-z > O < 2 >, x + y + z is smaller than or equal to 1 and larger than or equal to 0.8 and smaller than or equal to 1, y is larger than or equal to 0 and smaller than or equal to 0.2, and z is larger than or equal to 0 and smaller than or equal to 0.2; m comprises at least one of Ti, Al, Zr, Mg, Zn, Ba, Mo and B; the non-aqueous electrolyte comprises a cyclic sulfate compound as shown in a formula I in the specification. The lithium secondary battery has good cycle performance and storage life.

A non-aqueous electrolyte comprises a lithium salt, an organic solvent, and an additive, wherein the additive includes a compounds represented by Formula 1, and such non-aqueous electrolyte may be capable of suppressing the degradation of the positive electrode, reducing side reactions between the positive electrode and the electrolyte, and forming a stable SEI film on the negative electrode, thereby improving high-temperature cycle properties and high-temperature storage properties:wherein all the variables are described herein.

A flame retardant group-containing polymer, a separator of a non-aqueous electrolyte battery comprising the flame retardant group-containing polymer, and a non-aqueous electrolyte battery. The flame retardant group-containing polymer includes a first repeating unit, a second repeating unit, and a third repeating unit.

The disclosure relates to an aqueous electrochemical device comprising a negative electrode, a positive electrode, a separator and an aqueous electrolyte having an alkaline pH, wherein onto the positive electrode is disposed at least one layer of nanoparticles capable of being used to form a local hydronium ion rich environment at the positive electrode during operation of the device, and / or the capacity ratio between the negative electrode and the positive electrode is less than 1 so as to substantially avoid production of oxygen at the positive electrode. The electrochemical device may find particular use in large-scale energy storage.

The application discloses a nanofiber diaphragm and a preparation method and application thereof. The diaphragm has a thickness of 80-200 mu m, comprises a diaphragm and an inorganic ceramic material coated on the surface of the diaphragm, and the diaphragm contains a porous organic cage. The good solution processability and compatibility of the porous organic cage with the polymer provide a strong condition for the dispersion of the porous organic cage in the polymer, promote the hybridization of the porous organic cage and the polymer at a molecular level, and obtain a porous organic cage hybrid nanofiber diaphragm. The electrospinning porous organic cage hybrid nanofiber diaphragm has high porosity, electrolyte absorption rate and hydrophilicity, can combine a large number of water molecules, is favorable for reducing corrosion of a zinc negative electrode in contact with an aqueous electrolyte, has extremely high mechanical strength, can induce uniform deposition of zinc ions, and inhibits growth of zinc dendrites; the inorganic ceramic coating prevents the diaphragm from being punctured, improves the electrochemical performance and cycle life of an aqueous zinc ion battery, and has great application potential in the field of diaphragms for aqueous zinc ion batteries.

In order to solve the technical problem that battery impedance is increased due to the fact that a high-temperature performance additive is added into an existing lithium ion battery, the invention provides a non-aqueous electrolyte and a lithium battery, the non-aqueous electrolyte comprises a solvent, an electrolyte salt and an additive, the additive comprises a first additive and a second additive, the first additive comprises at least one of compounds shown in a structural formula 1: A-D-B-E-C structural formula 1; the second additive comprises at least one of compounds shown in a structural formula 2: the non-aqueous electrolyte with the structural formula 2 meets the following relational expressions: 0.15 < b / (a + b) < 0.65, 0.1% < = a < = 3%, and 0.1% < = b < = 1%. According to the non-aqueous electrolyte provided by the invention, the high-temperature cycle capacity retention rate and the high-temperature storage performance of the battery can be improved, impedance increase in the high-temperature cycle and high-temperature storage processes is effectively inhibited, gas production is reduced, and the high-temperature performance of the electrolyte is remarkably improved.

The invention provides an isosulfinate electrolyte additive for a lithium secondary battery and a non-aqueous electrolyte, and relates to the technical field of lithium secondary batteries. The non-aqueous electrolyte for the lithium secondary battery is characterized by comprising a non-aqueous organic solvent, a conductive lithium salt electrolyte and a sulfinic acid isosalt electrolyte additive for the lithium secondary battery. According to the additive, a sulfur-rich stable SEI membrane is constructed by utilizing a sulfinic acid group, impedance is reduced, the additive adapts to electrode volume change, and the cycle life is prolonged; dissimilar alkali metal ions optimize a solvation structure and form a mixed interface, so that a desolvation energy barrier is reduced, and low-temperature and rate performance is improved; meanwhile, the electrostatic shielding effect of large-radius positive ions can guide uniform deposition of lithium, dendritic crystals and dead lithium are inhibited, and the safety of the battery is enhanced.

This lithium secondary battery is provided with a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte. In the negative electrode, lithium metal is precipitated during charging, and the lithium metal is dissolved during discharging. The separator is provided with a sheet-like base material and a spacer disposed on the main surface of the base material. The spacer includes a convex portion. The ratio St / S of the area St of a portion At where a region A in which the base material faces the positive electrode overlaps the protruding portion to the area S of the region A is set as X. The ratio Lt / L of the length Lt of the portion where the edge portion of the positive electrode overlaps the protruding portion to the length L of the edge portion along the outer shape of the positive electrode is defined as Y. At this time, Ylt is satisfied; x is a positive integer.

Provided is a method for producing a secondary battery electrode, using PTFE, capable of reducing electrical resistance thereof and achieving excellent strength at the same time, and a binder. A method for producing a secondary battery electrode using a non-aqueous electrolytic solution, including step (1) of preparing a powder composition for producing an electrode by using a binder that is a powder which is composed of a composition essentially including a polytetrafluoroethylene resin and a conductive aid and which is free of an active material, and step (2) of applying a shear force while mixing the composition for producing an electrode to obtain an electrode mixture, wherein step (2) is carried out with a content of a solvent in the composition for producing an electrode being 10% by mass or less.

The present invention provides an optimal non-aqueous electrolyte secondary battery having high durability against high rate charging and discharging and excellent safety. The non-aqueous electrolyte secondary battery 100 according to the present invention comprises a positive electrode 10, a negative electrode 20 and a separator 30 which is interposed between the positive electrode 10 and the negative electrode 20. The separator 30 has a two-layer structure which is composed of a porous polyethylene layer 34 mainly composed of polyethylene, and a porous polymer layer 32 mainly composed of a polymer having higher oxidation resistance than that of the polyethylene, and an inorganic filler layer 40 including an inorganic filler and a binder is formed on the surface of the polyethylene layer 34 on which the porous polymer layer 32 is not formed.

A positive electrode active material for a nonaqueous electrolyte secondary battery according to one embodiment of the present invention contains Ca, Sr, Pa, and a lithium transition metal composite oxide that contains 65 mol% or more of Ni and assumes the form of secondary particles formed by aggregation of primary particles. The ratio ICa_OUT / ICa_IN of the normalized intensity ICa_OUT of Ca on the surface of the secondary particles to the normalized intensity ICa_IN of Ca inside the secondary particles is 2 to 7, the ratio ISr_OUT / ISr_IN of the normalized intensity ISr_IN of Sr on the surface of the secondary particles to the normalized intensity ISr_IN of Sr inside the secondary particles is 2 to 7, and the Gini coefficient of PO3- inside the secondary particles is 0.6 or less.

The present invention relates to a non-aqueous electrolyte for a lithium secondary battery, which includes a first additive including a chromone-based compound, and a lithium secondary battery including the same.

In order to solve the problems that Fe ions are dissolved out and battery performance is affected in an existing lithium iron phosphate / lithium iron manganese phosphate battery, the invention provides a lithium ion battery, the lithium ion battery comprises a positive electrode, a negative electrode and a non-aqueous electrolyte, the positive electrode comprises a positive electrode material layer containing a positive electrode active material, and the non-aqueous electrolyte is arranged in the thickness direction of the positive electrode material layer. The projection of the positive electrode material layer on the negative electrode is located in the coverage range of the negative electrode material layer, and the positive electrode active material comprises a phosphate material coated and / or doped with a Ti element; the non-aqueous electrolyte comprises a non-aqueous organic solvent, an electrolyte salt and an additive, the additive comprises a first additive, and the first additive comprises a compound as shown in a structural formula 1; the lithium ion battery meets the following conditions: 0.3 < = a < = 5, 1.2 < = b < = 2.8, 0.05 < = c < = 2, and 0.1 < = d < = 0.8.

The present invention provides a non-aqueous electrolyte comprising a lithium salt, an organic solvent, and a compound of the following chemical formula 1. [Chemical formula 1] JPEG2026529144000058.jpg30170 In the above chemical formula 1, R1 is one selected from the group consisting of R, an alkyl group having 1 to 10 carbon atoms that may be substituted with fluorine, an alkenyl group having 2 to 10 carbon atoms that may be substituted with fluorine, an alkynyl group having 2 to 10 carbon atoms that may be substituted with fluorine, OR', OCOR', and F, and R' is one selected from the group consisting of an alkyl group having 1 to 10 carbon atoms that may be substituted with fluorine, an alkenyl group having 2 to 10 carbon atoms that may be substituted with fluorine, and an alkynyl group having 2 to 10 carbon atoms that may be substituted with fluorine, and R is a structure represented by the following chemical formula 2. [Chemical formula 2] JPEG2026529144000059.jpg54170 In the above chemical formula 2, Rx and Ry are each independently either H or F.

This application provides a secondary battery and a power consumption device. The secondary battery of this application comprises a negative electrode sheet and a non-aqueous electrolyte, the negative electrode sheet comprising a negative electrode active material having a volume average particle size Dv50 of 6 to 20 μm, the non-aqueous electrolyte comprising an additive and a non-aqueous solvent, the additive comprising a cyclic sulfate ester compound represented by formula (I), and the non-aqueous solvent comprising ethylene carbonate. Thus, this application forms a non-aqueous electrolyte using an ethylene carbonate solvent and an additive and combines it with a negative electrode active material of a certain particle size. JPEG2026518375000042.jpg4569

To provide a method for producing coated particles that, when used as a positive electrode active material for non-aqueous electrolyte secondary batteries, including lithium-ion secondary batteries, result in non-aqueous electrolyte secondary batteries exhibiting excellent charge / discharge capacity, electrical resistance, and cycle characteristics. [Solution] The manufacturing method according to the present disclosure comprises an addition step of adding a boron-containing additive compound to a lithium metal composite oxide to obtain a mixture, and a heat treatment step of applying heat treatment to the mixture to obtain coated particles, wherein in the heat treatment step, the sulfate ion concentration in the mixture before heat treatment is 1200 ppm or more and 5000 ppm or less, and the amount of sulfate ions relative to the amount of boron (SO4 / B) is 0.1 (mol / mol) or more and 1.0 (mol / mol) or less.

The invention discloses a pretreatment method for a negative pole piece of an aqueous zinc ion secondary battery, which comprises the following steps: preparing a treatment solution composed of deionized water, an alcohol organic matter and zinc tetrafluoroborate, immersing a zinc foil into the treatment solution, standing for 1-3 days, taking out, washing and drying to obtain the surface-modified zinc negative pole piece. The invention provides a pretreatment process for applying the functionalized electrolyte to the zinc negative electrode for the first time, so that active and controllable modification of a zinc negative electrode interface is realized, and the uncontrollability of a self-formed interface traditionally depending on a first cycle is avoided. A uniform and compact interface layer is formed on the surface of the zinc negative electrode pretreated through the method, zinc dendrite growth and side reactions such as hydrogen evolution and corrosion are effectively inhibited, the coulombic efficiency is remarkably improved, and the cycle life is remarkably prolonged. The method has the advantages of simple process, cheap raw materials, no need of complex equipment, easiness in integration with an existing battery production line, compatibility of treating fluid components with a conventional aqueous electrolyte, no influence on subsequent normal operation of a battery, and good industrial application prospect.

Lithium secondary battery, comprehensive a positive electrode, a negative electrode, a separator and a non-aqueous electrolyte, wherein: the positive electrode comprises a positive electrode active material, wherein the positive electrode active material comprises lithium iron phosphate particles and the positive electrode has a loading amount of 450 mg / 25 cm² 2 up to 740 mg / 25 cm 2 exhibits; and the non-aqueous electrolyte comprises a lithium salt, an organic solvent and an additive, wherein the organic solvent comprises a solvent based on a cyclic carbonate and a solvent based on a linear carbonate, wherein the solvent based on a cyclic carbonate comprises ethylene carbonate and the solvent based on a linear carbonate comprises dimethyl carbonate, the additive comprises vinylene carbonate and the dimethyl carbonate is present in an amount of 5 vol% to 75 vol% in the organic solvent and the weight ratio of vinylene carbonate to dimethyl carbonate is greater than 0 to 0.2 or less.

The present disclosure provides a nonaqueous electrolyte solution containing: (1) at least one selected from the group consisting of a compound represented by Formula (1) described in the specification, and a compound represented by Formula (2) described in the specification; a nonaqueous electrolyte solution battery including at least a positive electrode, a negative electrode, and the nonaqueous electrolyte solution; and a method for producing a nonaqueous electrolyte solution battery using the nonaqueous electrolyte solution.

A lithium ion secondary battery includes, a positive electrode including a positive electrode active material, a negative electrode, and a non-aqueous electrolyte solution, wherein the non-aqueous electrolyte solution includes comprises LiPF6 and a lithium imide salt as an electrolyte, and includes a carbonate-based solvent as a solvent, the lithium ion secondary battery includes or does not include a surplus electrolyte solution, the ratio of the positive electrode capacity to the negative electrode capacity is adjusted to less than 1, the nominal voltage is adjusted to less than 3.6 V, and the total content of LiPF6 and lithium imide salt included in the non-aqueous electrolyte solution per unit battery capacity and the ratio of the positive electrode capacity to the negative electrode capacity are adjusted to satisfy a specific relationship.

This application discloses a nonaqueous electrolyte solution, a secondary battery containing the nonaqueous electrolyte solution, and an electrical device. The nonaqueous electrolyte solution includes: a compound A including a saturated five-membered ring or six-membered ring and at least one fluorine-containing substituent, where the ring contains 1 or 2 oxygen atoms as ring atoms, and a ring carbon atom connected to the oxygen atom in the ring is not directly replaced by fluorine; and a compound B including a saturated five-membered ring or six-membered ring that contains 1 or 2 oxygen atoms as ring atoms, where at least one ring carbon atom connected to the oxygen atom in the ring is directly replaced by at least one fluorine atom. The nonaqueous electrolyte solution can improve cycle performance and low-temperature discharge capabilities of the secondary battery.