48results about How to "High specific energy density" patented technology

The invention provides a method of making fluorine-containing gel state electrolyte material and polymeric lithium ion cells by employing in-situ thermal cross bonding process, wherein fluorine-containing acrylic ester material is used as monomer, and double functional group acrylic acid ester containing polyethylene glycol or triple functional group acrylic acid ester containing polyethylene glycol are used as cross linking agent, the making process comprises injecting the miscible liquid comprising monomer, cross linking agent, thermal initiation agent and lithium ion electrolyte salt solution into the core of lithium ion cells, heating the cell to result in-situ thermal chemical cross-linking for the two acrylic esters, whereby the acrylic ester copolymer network bundles the solution in the electrolyte, forming the gel state electrolyte material with stabilized physical and chemical properties.

The invention discloses a cobalt-nitrogen co-doped carbon-based electrocatalyst material and a preparation method thereof, and belongs to the field of electrochemistry and new energy, wherein the cobalt-nitrogen co-doped carbon-based nano material is prepared by taking an anionic metal organic framework encapsulated with metal cobalt ions as a precursor through a high-temperature pyrolysis methodin a nitrogen atmosphere, and has excellent oxygen reduction, oxygen evolution and hydrogen evolution catalytic performances under an alkaline condition. According to the invention, a rechargeable zinc-air battery and a full water splitting device assembled by utilizing the material have good charging and discharging performance and long-term stability; and the preparation process is simple, and the catalyst is good in performance, economical and capable of being prepared on a large scale.

The invention discloses a composite lithium battery and a preparation method thereof. The composite lithium battery comprises an anode, a cathode, electrolyte and a diaphragm, wherein the anode comprises an anode active substance; the anode active substance is prepared from elemental sulfur and ferric phosphate or sulfide and lithium iron phosphate in a compounded manner; and the cathode is a lithium metal cathode or a composite cathode of metallic lithium and carbon. As the advantages of high specific volume of sulfur and high security and long service life of a lithium iron phosphate material are utilized, the defect that a conventional lithium iron phosphate ion battery is low in discharge energy density can be avoided, the defects that a lithium sulfur battery is low in security and poor in circulation property can be also avoided, and comprehensive properties of energy density, security and circulation service life of the battery can be improved.

The invention relates to a graphene/manganese dioxide-based asymmetric coaxial fiber supercapacitor and preparation and application thereof. The capacitor has a three-layer structure. The inner electrode in the center is graphene/manganese dioxide hybrid fiber, and the outer layer is pure graphene. The two layers are separated by phosphoric acid/polyvinyl alcohol as electrolyte. The preparation methods includes preparation of graphite oxide dispersion, preparation of manganese dioxide nanorods, preparation of graphite oxide/manganese dioxide hybrid fibers, and preparation of graphene/manganesedioxide-based asymmetric coaxial fiber supercapacitors. The supercapacitor has high bulk energy density and good flexibility. The preparation process is simple and the cost is low, the graphene/manganese dioxide-based asymmetric coaxial fiber supercapacitor is expected to be used in the fields of flexible energy storage and wearable devices.

The invention provides a preparation method of high-performance lithium salt, and belongs to the technical field of lithium salt for a battery. The preparation method comprises the following steps ofA, using vinyl sulfonyl fluoride or 1,3-propane bi-sulfonyl fluoride as the raw material, leading ammonia gas to bubble, adding diethyl ether, and acting at the temperature of 5 to 10 DEG C, so as toobtain sulfonyl amide or 1,3-propane bisulfonyl amide; B, adding the product obtained in step A into lithium hydroxide, and reacting at the temperature of 50 to 60 DEG C, so as to obtain the high-performance lithium salt, wherein the high-performance lithium salt contains the high-performance lithium salt and the high-performance lithium salt with substituted perfluoroalkyl. The preparation methodhas the advantages that the preparation method is simple; a wholly novel preparation method for the lithium salt of the battery is provided; the yield rate of the product is high, the purity is high,and the property is good after the high-performance lithium salt is applied to the battery.

An electrochemical hybrid capacitor which is based on a water-based acidic electrolyte belongs to the technical field of chemical power supplies. A positive electrode in the electrochemical hybrid capacitor adopts electrode materials and carbon materials which are applicable to water-based inorganic acid solution; a negative electrode adopts one or the mixture of more than two of activated carbon with porous structure, mesoporous carbon, carbon fiber and carbon aerogel; the electrochemical hybrid capacitor is characterized in that the support electrolyte is water-based acidic solution containing metal salts, wherein, the metal salts comprise one or the mixture of more than two of the metal salts which are easily dissolved in H2SO4, H3PO4, HCL or HNO3 solution and contain inorganic metal irons with the valence states of +1, +2 and +3. Compared with the general non-symmetric hybrid capacitor, the supercapacitor has higher energy density due to the addition of the metal salts; furthermore, as the sources of the materials are wide, the cost is low and the preparation is easy, the electrochemical hybrid capacitor has great application prospect.

The invention discloses a preparation method of a negative electrode lithium-supplementing high-nickel lithium ion power cell; according to the method disclosed by the invention, a positive electrodehigh-nickel material can be made to play the optimal performance by adjusting the proportion; the preparation method of the negative electrode lithium-supplementing lithium ion power cell comprises the following steps of coating a negative electrode slurry on a negative electrode current collector to obtain a negative plate, and then, carrying out rolling on the negative plate, wherein during rolling, two metal lithium sheets are placed on the two sides of the negative plate for rolling respectively. According to the preparation method, when the coated negative plate is rolled, and the metal lithium sheets are pressed on the two surfaces of the negative plate, so that the initial coulombic efficiency of the single lithium ion cell and the specific energy density of the cell are improved. The specific energy of the single lithium ion power battery is 300 Wh/kg or above.

The invention relates to a preparation method of a high-compaction lithium iron phosphate pole piece, a lithium iron phosphate material is composed of large particles and small particles with different sizes, and the preparation method comprises the following steps: nanocrystallization of an initial raw material, pretreatment of the initial material, high-temperature sintering, and mixing and size mixing of a lithium iron phosphate active material, a conductive agent and a binder according to a ratio; and coating an aluminum foil with the slurry according to a fixed thickness to obtain a high-compaction positive pole piece. The method is simple in step operation, easy in condition control and convenient for large-scale production, and the energy density of the battery is greatly improved.

The invention discloses a preparation method of a conjugated carboxylate negative electrode material of a lithium ion battery. The method comprises the steps of enabling [2, 2': 6', 2''- terpyridine]-4, 4', 4''-tricarboxylic acid and alkali to be subjected to a neutralization reaction to synthesize [2, 2': 6', 2''- terpyridine]-4, 4', 4''-lithium tricarboxylate; reacting with nitrates corresponding to fourth periodic element metals cobalt, nickel, copper and zinc at a temperature of 60 DEG C for 5 hours to synthesize [2, 2': 6', 2''- terpyridine]-4, 4', 4''-tricarboxylate; and grinding the synthetic material, acetylene black, and polyvinylidene fluoride in N-methyl pyrrolidone, coating the mixture on a copper foil, drying the coated copper foil, cutting the dried copper foil into pieces, manufacturing button cells in a glove box, and carrying out electrochemical performance characterization. The conjugated carboxylate synthesized according to the method provided by the invention contains multiple discharge sites such as a valence-variable metal center and carboxylate radicals; the conjugated carboxylate synthesized according to the method can make good use of a synergistic lithiumstorage effect among the carboxylate, a conjugated aromatic system and variable-valence metal, and the electrochemical performance of the material is improved. It is found that the material has relatively high specific discharge capacity and excellent cycle performance through a constant current charge-discharge test.

The invention belongs to the field of supercapacitors, and particularly relates to an asymmetric supercapacitor monomer and a preparation method thereof. The supercapacitor comprises a positive electrode, a negative electrode and a membrane infiltrated by an electrolyte, wherein the positive electrode is a current collector to which a porous polypyrrole-carbon nanotube composite (PPy-CNT) is attached; the negative electrode is the current collector to which carbon black is attached; and the mass ratio of the porous polypyrrole-carbon nanotube composite to the carbon black is 1.1-2.3. The adopted positive capacitance and negative capacitance are not equal, so that, compared with the prior art, the asymmetric supercapacitor has the advantages that the amount of a positive electrode material is significantly increased and the amount of a negative electrode material is reduced; the advantages of a PPy-CNT porous three-dimensional structure of the positive electrode can be better developed; the disadvantage that a negative electrode carbon material is relatively poor in ion diffusion ability is weakened; the voltage of the supercapacitor is increased by over 1.5 times; and the corresponding specific energy and power density are more than doubled.

The invention discloses a preparation method of a lithium-sulfur battery flexible positive electrode. The flexible positive electrode is formed by dispersing nitrogen-doped porous carbon fibers loaded with S<1-x>Sex among graphene sheet layers. The preparation method comprises the following steps: first compounding sulfur and selenium with nitrogen-doped porous carbon fibers to form a nitrogen-doped porous carbon fiber/S<1-x>Sex composite material, then adding the nitrogen-doped porous carbon fiber/S<1-x>Sex composite material into solvent, ultrasonically dispersing the solvent to obtain graphene and nitrogen-doped porous carbon fiber/S<1-x>Sex composite material composite suspension, vacuum suction filtering the composite suspension to obtain a filter cake, and drying the filter cake to obtain the flexible positive electrode of the graphene/nitrogen-doped porous carbon fiber/S<1-x>Sex composite material. The lithium-sulfur battery flexible positive electrode obtained by virtue of the preparation method has advantages of good conductivity, good sulfur and selenium fixing effect, high mechanical strength and the like. Meanwhile, the preparation method is simple, no complicated coating process is needed, no adhesive, conducting agent and current collector is needed, and the prepared flexible positive electrode is applied to a lithium-sulfur battery and has excellent electrochemical performance.