144results about How to "Cyclic stability" patented technology

The invention discloses a lithium iron phosphate battery. The lithium iron phosphate battery comprises a positive electrode, a negative electrode, an isolating membrane and an electrolyte, a main material of the positive electrode comprises lithium iron phosphate, and a main material of the negative electrode comprises graphite and a silicon-based material; the surface density of the positive electrode is greater than or equal to 23mg / cm < 2 >, and the surface density of the negative electrode is greater than or equal to 7.8 mg The electrolyte comprises a lithium salt, a solvent and an additive, the solvent mainly comprises ethylene carbonate and a micromolecular linear solvent, the additive comprises FEC and a negative electrode film-forming additive, and a negative electrode film-forming agent comprises vinylene carbonate and a lithium salt additive; the mass fraction of the micromolecular linear solvent is 35%-60%, the mass fraction of the fluoroethylene carbonate is M, the mass fraction of the silicon element in the negative electrode layer is W1, M is greater than or equal to 2% and less than or equal to 2 * W1, and the mass fraction of the negative electrode film-forming agent is 4%-6%. The energy density of the battery cell can be improved and the cycle life and the quick charge capacity of the battery cell are both considered by doping a silicon-based material into the negative electrode, designing a thick electrode and adjusting an electrolyte formula.

The invention relates to the technical field of lithium batteries, in particular to a composite binder aqueous solution, a silicon-based negative pole piece and a preparation method and application of the silicon-based negative pole piece. The preparation method of the composite binder aqueous solution comprises the following steps: dissolving a water-based polymer binder and a micromolecular physical crosslinking agent in water, adding pyrrole, stirring, adding an initiator, and mixing to obtain the composite binder aqueous solution. A small molecule physical cross-linking agent is introduced into the water-based polymer binder, and a large number of hydrogen bond binding sites are increased, so that the mechanical property of the binder is remarkably enhanced, and the machinability of the pole piece is further improved. Meanwhile, polypyrrole can be generated in the binder through in-situ polymerization, and the polypyrrole can be tightly coated on the surfaces of the silicon particles through strong interaction between the binder and the silicon particles to form a stable conductive network, so that the charge transfer capability of the electrode is remarkably improved. In addition, the composite binder is also beneficial to formation of a solid electrolyte layer rich in Li-N and participates in formation of a solid electrolyte interface layer, so that the lithium ion transmission capability of the composite binder is further improved.

The invention provides an amine low-water-content absorbent for capturing carbon dioxide and application of the amine low-water-content absorbent. The amine low-water absorbent comprises, by mass, 20%-50% of an absorbent main agent, 35%-70% of an auxiliary solvent and 2%-20% of water, and the range of a solvent effect factor delta of the amine low-water absorbent is 0.28-0.32. According to the method, the composition of the water-less absorbent is screened and optimized through a solvent effect factor formula, the amine water-less absorbent which is easy to desorb, low in regeneration energy consumption and low in viscosity characteristic is obtained, and wide application of the amine water-less absorbent in a carbon capture technology is promoted.

The invention relates to a bipolar organic positive electrode material and a preparation method and application thereof, and belongs to the technical field of preparation of positive electrode materials. The structural formula of the bipolar organic positive electrode material is # imgabs0 #, wherein n is greater than or equal to 1. The bipolar organic positive electrode material simultaneously has phenanthrenequinone and phenazine structures, can be used as energy storage units, has the characteristic of bipolar, and can store Na < + > and PF6 <-> at the same time, so that the bipolar organic positive electrode material has good electrochemical performance, and can be used as a positive electrode of a sodium ion battery. The material shows high specific capacity, stable circulation and excellent rate capability, and has a wide application prospect. In addition, in the preparation process of the bipolar organic positive electrode material, the synthetic route is simple, and the bipolar organic positive electrode material can be obtained through one-step synthesis.

The invention provides an anthryl compound, a preparation method thereof and application of the anthryl compound as solar thermal fuel, and belongs to the field of energy and chemical industry. The anthryl compound can be converted into a dimer under the irradiation of 365nm ultraviolet light and store light energy as chemical energy at the same time, and is subjected to a photodepolymerization reaction under the irradiation of 254nm ultraviolet light and releases heat at the same time, that is, the anthryl solar thermal fuel can store or release photo-thermal energy through a reversible photodimerization / depolymerization reaction. In addition, the anthryl compound also has the unique advantage of light-operated reversible solid-liquid phase change, and the simultaneous storage of photon energy and phase change energy can be realized. The storage energy density of the anthryl compound is about 65 kJ / mol, and the storage half-life period is as long as 60 days. The anthryl compound and the preparation method thereof provided by the invention provide a new strategy for light energy storage and utilization.

The invention discloses a PEO-based solid electrolyte film and a preparation method and application thereof, the PEO-based solid electrolyte film comprises a polymer matrix and a lithium salt, the polymer matrix is selected from PEO, and the lithium salt is selected from LiTFSI; the PEO-based solid electrolyte film also comprises a molecular coordination regulator and a filler, the molecular coordination regulator is selected from DFBOP, and the filler is selected from LLZTO. According to the PEO-based solid electrolyte film disclosed by the invention, the problems of poor lithium stability and high-voltage compatibility of PEO-based solid electrolyte can be remarkably improved, and the cycling stability and rate capability of a PEO-based solid lithium metal battery can be remarkably improved.

The invention relates to the field of aqueous zinc ion batteries, in particular to a preparation method and application of copper phosphate for inhibiting zinc dendritic crystal growth, which adopts a hydrothermal reaction method to construct a copper phosphate (CP) protective layer on the surface of a zinc anode in situ, so that more zinc-loving sites are provided, Zn < 2 + > is uniformly deposited on the anode, and the zinc dendritic crystal growth is inhibited. The Cu3 (PO4) 2 cathode prepared by the method has the advantages that the'point effect 'caused by non-uniform deposition of Zn < 2 + > is effectively reduced, the hydrophobicity of the anode side is improved, the direct contact between water and zinc in electrolyte is reduced, the hydrogen evolution and the formation of a by-product Zn4 (OH) 6SO4. XH2O are effectively reduced, and the prepared Cu3 (PO4) 2 cathode has the service life of 2000 hours compared with a pure zinc cathode (110 hours) in the test of an assembled symmetrical battery, and has the advantages of high efficiency, high safety and the like. And compared with a pure zinc negative electrode (38.69%), the total battery assembled with the MnO2 negative electrode has higher capacity retention rate (more than 66%) and longer service life (more than 3000 weeks).

The invention discloses a plate-fin heat exchanger and a lubricating and cooling system for a gearbox of a wind driven generator. The technical problem that the flow resistance of a target medium in the plate-fin heat exchanger is too large when the viscosity of the target medium is gradually increased along with the proceeding of a heat exchange process is solved. Comprising a core part, a target medium input part and a target medium output part, the target medium input part comprises an input channel arranged on the inner side of the core part, the input channel divides the core part into two heat exchange areas located on the two sides of the input channel respectively, and the input channel is communicated with the target medium inlet ends of the two heat exchange areas at the same time. The target medium output part comprises a first output channel and a second output channel which are distributed on the edge of the core part, and the first output channel and the second output channel communicate with the target medium outlet ends of the two heat exchange areas correspondingly. By dividing the core part into the two heat exchange areas, the flowing path of the target medium is shortened, and therefore the flowing resistance of the target medium in the heat exchange process is reduced.

According to the double-site doped ferric sodium pyrophosphate / carbon composite positive electrode material and the preparation method thereof, tungstate is introduced in the raw material mixing process, and the Fe site and the PO4 site are respectively occupied in the forms of W < 6 + > and WO4 < 2-> in the synthesis process; the chemical formula of the obtained double-site doped ferric pyrophosphate sodium / carbon composite positive electrode material is Na4Fe3-xWx (PO4) 2-y (WO4) y (P2O7) / C, x is greater than or equal to 0 and less than or equal to 0.3, and y is greater than or equal to 0 and less than or equal to 0.3. The invention also comprises a preparation method of the double-site doped ferric sodium pyrophosphate / carbon composite positive electrode material. According to the double-site doped ferric pyrophosphate sodium / carbon composite positive electrode material, the phase purity is greatly improved, non-active marmite type ferric phosphate sodium and low-capacity ferric pyrophosphate sodium impurity phases do not exist, and sodium-iron antisite defects in the structure are obviously reduced. The positive electrode material is good in electronic conductivity and ionic conductivity, high in specific capacity, good in rate capability and long in cycle life, and the high and low temperature performance is also remarkably improved.

The invention relates to a method for recovering hydrogen fluoride gas, which is used for recovering hydrogen fluoride gas in NF3 produced by an electrolytic method, and the method comprises the following steps: mixed gas discharged from a cathode of an electrolytic bath flows into a gas buffer tank; ammonium hydrogen fluoride in the mixed gas is condensed in the gas buffer tank, the residual hydrogen and hydrogen fluoride flow into the micro-channel unit, the hydrogen fluoride is condensed in the micro-channel unit, the condensed hydrogen fluoride flows back to the gas buffer tank, and the uncondensed hydrogen fluoride and hydrogen flow into the falling film absorption unit; the hydrogen fluoride is absorbed by an absorber in the falling film absorption unit, the hydrogen fluoride is recovered as a hydrofluoric acid solution, and the residual hydrogen and the residual hydrogen fluoride flow into a three-waste treatment pond; and residual hydrogen fluoride in the three-waste treatment tank is completely absorbed. According to the invention, the single-tube parallel micro-channel condenser is adopted as a condensation unit, and the tube diameter is as small as 10-1000 microns, so that the heat exchange area is greatly increased, the hydrogen fluoride gas can be more effectively condensed and recovered, and the recovery efficiency is remarkably improved.

The invention relates to a wide-temperature-range high-voltage electrolyte, a lithium battery and a preparation method of the lithium battery. The wide-temperature-range high-voltage electrolyte comprises a lithium salt, an electrolyte solvent, a first additive, a second additive and a third additive, wherein the first additive is fluoroethylene carbonate; the second additive is at least one of 1, 3-propane sultone and propylene sulfite; and the third additive is at least one of dimethoxy (methyl) (3, 3, 3-trifluoropropyl) silane and trimethylsilyl phosphite ester.

The invention provides a mining anti-explosion underground large-gradient road surface washing and sweeping vehicle which comprises a hydraulic retarder and a water storage tank used for storing road surface washing water, and further comprises a heat exchanger which is arranged in a heat conduction oil tank of the hydraulic retarder and exchanges heat with oil in the heat conduction oil tank, and heat exchange media circulate in the heat exchanger; the first radiator is arranged in the water storage tank and exchanges heat with water in the water storage tank; the first circulating pump is sequentially communicated with the heat exchanger and the first radiator in a closed-loop manner to form a first cycle so as to circularly transport a heat exchange medium; the first expansion box is connected to the two ends of the first radiator. According to the mining anti-explosion underground large-gradient road surface washing and sweeping vehicle, the hydraulic retarder can be independently cooled, a cooling system of the washing and sweeping vehicle is not occupied, more energy is saved, the cooling effect on the hydraulic retarder is improved, and then the underground running safety of the washing and sweeping vehicle is improved.

The invention discloses a three-dimensional porous current collector as well as a preparation method and application thereof, belongs to the technical field of a sodium metal battery current collector, and solves the problem that the electrochemical performance of a metal sodium battery without a negative electrode in the prior art is not ideal enough. The three-dimensional porous current collector comprises a copper substrate and bismuth nanosheets vertically grown on the surface of the copper substrate, wherein the copper substrate is of a net structure, and the bismuth nanosheet is of a three-dimensional honeycomb structure. The three-dimensional porous current collector provided by the invention has ultra-stable sodium deposition stripping performance and excellent long cycle stability.

The invention belongs to the technical field of solid waste recycling and organic wastewater treatment, and particularly relates to a method for treating organic wastewater by utilizing a composite material constructed by waste lithium iron phosphate to activate peroxymonosulfate. The method comprises the following steps: carrying out pyrolysis treatment on a waste lithium iron phosphate battery positive electrode material, and collecting a waste lithium iron phosphate SLFP powder material; preparing the SLFP into a uniform solution; sodium molybdate dihydrate and thioacetamide are added into the solution for a hydrothermal reaction, and a composite catalyst material SLFP-MoS2 is prepared; putting the catalyst into the wastewater to achieve adsorption equilibrium; and adding peroxymonosulfate to trigger an oxidation reaction, and removing organic pollutants in the solution. The SLFP-MoS2 catalyst provided by the invention can realize mutual promotion of Fe-Mo bimetal active sites, ensures stable circulation of iron ions and molybdenum ions in a local microenvironment, further activates peroxymonosulfate (PMS) to generate active species, and realizes effective removal of organic pollutants in wastewater.

The invention discloses a lithium-rich manganese-based battery low-voltage formation method and application thereof, and relates to the technical field of lithium batteries. The formation step is carried out after the standing step, in the low-voltage formation process, a constant-current charging mode is adopted to regulate and control the voltage to carry out formation on the battery so as to activate different lithium-rich manganese-based phases, and the activation degree of the Li2MnO3 phase in the positive electrode material is effectively controlled in the circulation process, so that the trend that the initial capacity is increased is shown, and the circulation is stable; the effect of improving the cycling stability is achieved. According to the low-voltage formation method, the gas production rate in the formation and circulation process is reduced, the capacity retention rate in the circulation process is improved, the formation time can be saved, the energy consumption of battery production is reduced, and the production efficiency is improved.

The invention belongs to the technical field of membrane-free batteries, and particularly relates to a membrane-free dual-phase battery electrolyte and a membrane-free dual-phase battery. According to the membrane-free dual-phase battery, a low-temperature stable organic solvent and water are used as solvents of a two-phase electrolyte, and zinc ion salt is used as a negative electrode electrolyte; a certain proportion of anti-freezing material is added, and an alkane additive is complexed with an organic solvent of a halogen monomer to serve as a positive electrode electrolyte. The problems of high cost and short service life caused by the use of an ion exchange membrane in a liquid battery are avoided, the battery electrolyte is still in a liquid state at low temperature, the temperature working condition of a liquid energy storage battery system is greatly widened, the use of an external heat source under the working condition in winter and the condition that zinc is seriously corroded at normal temperature are avoided, and the service life of the battery is prolonged. The cost of the energy storage system is further reduced.

According to the local high-concentration electrolyte of the lithium metal battery capable of realizing high energy density and long cycle life as well as the preparation method and the application of the local high-concentration electrolyte, the viscosity is reduced through the 1, 1, 2, 3, 3, 3-hexafluoropropyl-2, 2, 2-trifluoroether diluent, the wettability of the electrolyte is improved, and meanwhile, the 1, 1, 2, 3, 3, 3-hexafluoropropyl-2, 2, 2-trifluoroether diluent enters a Li < + > solvation shell layer, so that the lithium metal battery can be prepared. The oxygenolysis of solvent molecules is inhibited. In addition, uniform deposition of lithium metal is promoted, a firm and stable SEI film is formed, and side reaction of the electrode and electrolyte is inhibited; the stable long circulation capability of the lithium metal battery is enhanced, 500 times of stable long circulation of the lithium metal battery at 25 DEG C can be realized under the coupling condition of an ultrahigh-load positive electrode (-20 mg / cm < 2 >) and a thin lithium negative electrode (50 microns), and the average coulombic efficiency exceeds 99.9%. The local high-concentration electrolyte enables a 500 Wh / kg lithium metal soft package battery to stably circulate for 90 times at 25 DEG C.

A preparation method and application of a zinc phosphate film, which belongs to the field of metallic zinc negative electrodes of aqueous zinc ion batteries. The present invention aims to solve the problem that the artificial protective layer constructed on the surface of the existing zinc negative electrode has uneven thickness and is difficult to reach the nanometer level, or it is difficult to control the thickness of the interface protective layer. Preparation method: Add a zinc sulfate aqueous solution into a reaction container, drip a dodecyl phosphoric acid / chloroform solution on the surface of the zinc sulfate aqueous solution, and then inject a sodium phosphate aqueous solution, let it stand at room temperature, and obtain a zinc phosphate film at the interface between air and liquid; Application: The zinc phosphate film is used as an interface protective layer of the zinc negative electrode in an aqueous zinc ion battery. The present invention is used for a preparation method and application of a zinc phosphate film.

The invention relates to a zinc negative electrode modifier with a zinc-philic-hydrophobic double-interface protective layer, a modification method and application of the zinc negative electrode modifier, and belongs to the technical field of zinc ion batteries. According to the zinc ion battery negative electrode modification method, absolute ethyl alcohol, deionized water, zinc-philic or hydrophobic silane and zinc trifluoromethanesulfonate are uniformly mixed to obtain a modification solution, and the volume ratio of absolute ethyl alcohol to deionized water to silane is 90: 5: 5; the concentration of the zinc trifluoromethanesulfonate is 0.05 mol L <-1 > to 0.5 mol L <-1 >; the zinc-philic modification liquid and the hydrophobic modification liquid are sequentially sprayed to the surface of the pretreated zinc negative electrode, and the power of a spraying device is 2-10 W; the spraying time is 0.2-5 s cm <-2 >, and after spraying is completed, drying is conducted at the room temperature, and curing is conducted in a high-temperature drying box. According to the modification method, the generation of zinc dendrites and the generation of a hydrogen evolution reaction are inhibited by combining the dual effects of adjusting the zinc ion flux by the inner-layer zinc-philic silane and adjusting a hydrated ion solvation structure by the outer-layer hydrophobic silane, and the electrochemical performance of the battery is improved.

The invention belongs to the field of batteries, and particularly relates to a phosphoryl isocyanate additive, a preparation method of the phosphoryl isocyanate additive, an electrolyte, the additive and a lithium ion battery. The structure of the phosphoryl isocyanate additive is shown as the following formula (A): # imgabs0 #, R1 is one of alkyl, alkoxy, phenoxyl, alkenyl, alkynyl, phenyl and substitutes thereof with the carbon atom number of 1-6, and R2 is one of isocyanate, alkyl, alkenyl, alkynyl, phenyl and substitutes thereof with the carbon atom number of 1-6. By adding a small amount of phosphoryl isocyanate additive into the electrolyte, a CEI structure which is relatively low in resistance and stable under a high-voltage condition is formed on the surface of a positive electrode, so that the rate capability and the high-voltage cycle stability of the battery can be improved.

The invention relates to a low-concentration electrolyte suitable for prussian blue and hard carbon sodium ion batteries. The sodium-ion battery electrolyte is prepared by mixing a sodium salt, an ester organic solvent and a cosolvent, wherein the concentration of the sodium salt in the ester organic solvent is 0.04 to 0.86 mol / L. Due to the low concentration, the overall viscosity of the electrolyte can be reduced, the wettability of the electrolyte can be improved, the diffusion coefficient of sodium ions can be increased, and the cost of the electrolyte can be reduced to a certain extent. Through the unique solvation structure of the sodium salt and the ester organic solvent, a stable inorganic-rich solid electrolyte interface film with high ionic conductivity can be constructed on the surface of an electrode material, so that the electrolyte also has excellent performance at high temperature. The electrolyte disclosed by the invention is simple in preparation method and relatively low in cost, and has a considerable industrial application prospect.

The invention belongs to the field of organic electrolytes and potassium ion batteries, and particularly relates to a low-concentration ionic liquid electrolyte for breaking the concentration balance of potassium ions and anions and a high-energy-density potassium ion battery. The potassium ion battery comprises a Prussian blue (PB) positive electrode, an electrolyte and a commercial ferrocene (Fc) negative electrode which is not subjected to any treatment, and the electrolyte is a low-concentration ionic liquid electrolyte (FSI-: K + (3.5 / 0.3 M)) of potassium bis (fluorosulfonyl) imide (KFSI). The low-concentration ionic liquid electrolyte developed by the invention has a high anion: K < + > concentration ratio (3.5: 0.3 M), increases the solvation proportion of rich anions, reduces the dissolution of an Fc organic metal compound, and ensures high interface stability and rapid K < + > storage kinetics of an Fc negative electrode. Meanwhile, the electrochemical window of the low-concentration electrolyte is widened, the PB positive electrode can stably circulate at 1.0-4.4 V, the long-period circulation and excellent rate capability of the PBFc total battery are also realized, and the total battery has the energy density of 246.7 Wh / kg under the current density of 20 mA / g.

The invention discloses a process for preparing a V2O3 / ZnV2O3 total battery by simultaneously using vanadium oxide in a zinc ion battery as a positive electrode material and a negative electrode material, which comprises the following steps: reacting ammonium metavanadate with absolute ethyl alcohol by adopting a solvothermal synthesis method, washing, drying, and calcining in a tubular furnace to obtain V2O3; in the preparation process of the V2O3 positive electrode material, only V2O3, acetylene black serving as a conductive agent and PVDF serving as a binder are mixed in proportion and then are coated on graphite paper, other coating protection materials do not need to be introduced into a V2O3 / Zn negative electrode, and V2O3 is used as a protection layer to inhibit growth of zinc dendrites, relieve hydrogen evolution side reaction of the zinc negative electrode and reduce corrosion of zinc. Vanadium oxide V2O3 is directly used as a core positive electrode material, the zinc negative electrode coating is developed by utilizing the characteristics of the vanadium oxide V2O3, a material is formed, meanwhile, the performance optimization of the positive electrode and the negative electrode is realized, the used raw materials are simple and easy to obtain, the process is simple and easy to implement, and the preparation process is simple and easy to implement from V2O3 raw material synthesis to positive and negative electrode piece preparation to V2O3 / ZnV2O3 total battery assembly. And comprehensive improvement of positive and negative electrode performances of zinc ions is simultaneously realized by a single material.

The invention discloses a ventilation and heat dissipation system for a transformer substation, and relates to the technical field of transformer substation heat dissipation, the ventilation and heat dissipation system comprises a transformer substation box body and an auxiliary mechanism, the transformer substation box body is internally provided with a heat dissipation mechanism, the outer wall of the transformer substation box body is provided with a ventilation mechanism, the auxiliary mechanism comprises an annular pipeline, and the inner wall of the transformer substation box body is fixedly connected with a partition plate; the heat dissipation mechanism is inserted into the bottom end of the partition plate, the auxiliary mechanism is arranged below the heat dissipation mechanism, a plurality of connecting pipelines are fixedly inserted into the inner wall of the annular pipeline at intervals, and a liquid storage mechanism is arranged at the top end of the partition plate. Through the arrangement of the partition plate, the annular pipeline and the connecting pipeline and the cooperation of the liquid storage mechanism, cooling liquid in the liquid storage mechanism can flow into the annular pipeline and the connecting pipeline, then air blown out of the heat dissipation mechanism is aligned with the annular pipeline and the connecting pipeline, the temperature of the air blown out of the heat dissipation mechanism can be lower, and therefore the heat dissipation effect is improved; and stable work of the transformer substation is ensured.

The present application relates to the technical field of binder, and particularly relates to a water-based binder based on coordination cross-linking of polyvalent metal ions and a preparation method and application thereof.A preparation method of a water-based binder based on coordination cross-linking of polyvalent metal ions, specifically comprising the following steps: S1, dissolving carboxymethyl cellulose sodium in water, heating and stirring to form a carboxymethyl cellulose sodium aqueous solution; S2, dissolving a metal ion compound in deionized water to obtain a metal ion compound aqueous solution; the metal ion includes divalent metal ions and trivalent metal ions; S3, slowly adding the metal ion compound aqueous solution to the carboxymethyl cellulose sodium aqueous solution in a certain amount, continuously heating and stirring for a period of time, and obtaining the water-based binder.The mechanical property of the water-based binder is obviously improved, and the battery has better rate and more stable cycle.

The application discloses a composite pyrophosphate magnesium battery positive electrode material and a preparation method and application thereof. The positive electrode material comprises a magnesium ion positive electrode material pyrophosphate and a carbon layer coated on the magnesium ion positive electrode material pyrophosphate. The chemical formula of the positive electrode material is Mg a Na b M 2+x / 2 N y , wherein M is one or more of Fe, V, Ti, Cr, Ni, Cu, Mn, Co, Nb, N is one or more of P2O7 4‑ , PO4 3‑ , SO4 2‑ , BO3 3‑ , SiO4 4‑ , 0

The invention belongs to the field of energy storage, and particularly relates to a high-performance NASICON type oxide electrolyte and a preparation method thereof. The electrolyte takes an NASICON type oxide as a matrix and contains polyoxometallate accounting for 0.1-20% wt of the NASICON type oxide, the electrolyte can effectively improve the sodium affinity and intrinsic ionic conductivity of the NASICON solid electrolyte, and the interface impedance of the prepared sodium symmetric half cell at room temperature is smaller than 20 omegacm < 2 > and is as low as 16.7 omegacm < 2 >. According to the invention, the reaction between the NASICON and the additive is more uniform by adding the polyoxometallate in situ, a uniform and stable structure is formed, and the sodium ion conductivity of the NASICON solid electrolyte is effectively improved.

The invention belongs to the field of organic electrolyte and potassium ion batteries, and particularly relates to a high-energy-density potassium ion battery realized by medium-entropy electrolyte applicable to an alloy antimony / conductive carbon negative electrode. The potassium ion battery comprises a Prussian blue (PB) positive electrode, an electrolyte and an antimony / conductive carbon (Sb / SP) negative electrode, and the electrolyte is a medium-entropy electrolyte of potassium bis (fluorosulfonyl) imide (KFSI). The obviously improved rate performance of the medium-entropy electrolyte and the Sb / SP developed by the invention is attributed to a balance solvation structure driven by a double-entropy effect and a weak solvation effect, and the structure provides a collaborative guarantee for enough interface stability and dynamic compatibility. Meanwhile, the electrochemical window of the ether-based electrolyte is widened, the PB positive electrode can stably circulate at 2.0-4.4 V, and the PBMSESb / SP total battery can achieve the high energy density of 194 Wh / kg under the current density of 50 mA / g (based on the total mass of PB and Sb / SP).

The invention belongs to the technical field of electrode materials, and particularly relates to a preparation method and application of an alkali metal ion doped sodium vanadyl fluorophosphate carbon composite material. According to the invention, three methods of surface carbon coating modification, morphology modification and metal ion doping modification are combined, and the prepared lithium-doped sodium vanadyl fluorophosphate or potassium-doped sodium vanadyl fluorophosphate is used as an aqueous zinc ion battery positive electrode material, so that the battery can obtain excellent rate capability and stable cycle performance; and meanwhile, the structural stability of the battery in the long-cycle process can be ensured. The microwave hydrothermal assisted calcination method which is rapid in reaction, low in cost and capable of achieving a large scale is adopted, the reaction time can be greatly shortened, and the production efficiency can be improved. Meanwhile, the NVOPF is compounded with a nitrogen-carbon material with high electronic conductivity, and metal elements are doped at sodium element sites, so that the nitrogen-carbon compounded aqueous zinc ion battery positive electrode material with high magnification and long cycle stability can be obtained.

The invention relates to the technical field of batteries, in particular to a wide-temperature-range high-rate lithium battery ester-based electrolyte and application. The electrolyte comprises soluble lithium salt and a liquid component, the liquid component is a solvent; the solvent comprises at least three of propylene carbonate, fluoroethylene carbonate, isopropyl trifluoroacetate, ethyl trifluoroacetate, ethyl acetate, methyl acetate and methyl trifluoroacetate; the lithium salt lithium battery comprises at least two of common lithium salts. The electrolyte developed by the invention is used in the lithium battery and can stably work at 40-60 DEG C, the specific discharge capacity of the battery is still 62.83% of the specific discharge capacity of the battery at room temperature even at 30 DEG C and 4C multiplying power, and the electrolyte has excellent wide-temperature fast charge performance. In addition, the electrolyte effectively inhibits the growth of lithium dendrites and the side reaction of an electrode-electrolyte interface at low temperature, and promotes the formation of a solid interface film which is rich in inorganic matters and low in interface impedance. The invention has the advantages of reasonable component design and excellent product performance, and is convenient for industrial application.