26results about How to "Increase specific energy" patented technology

The invention discloses a method for recovering a PVDF (Polyvinylidene Fluoride)-containing positive electrode material from a waste lithium iron phosphate battery and preparing fluorine-doped lithium iron phosphate, and belongs to the technical field of waste battery recovery. The method comprises the following steps: discharging and disassembling waste lithium iron phosphate batteries to separate out positive plates; soaking the positive plate in hot water, and separating to obtain an invalid lithium iron phosphate positive electrode material containing PVDF and an aluminum foil; the preparation method comprises the following steps: drying and grinding the PVDF-containing invalid lithium iron phosphate positive electrode material into powder, uniformly mixing the powder with LiOH, and calcining in a non-oxidizing atmosphere to obtain the fluorine-doped lithium iron phosphate. According to the method, PVDF in the failed lithium iron phosphate material is fully utilized, the failed lithium iron phosphate positive electrode material can be efficiently repaired, the fluorine-doped lithium iron phosphate positive electrode material with better electrochemical performance is obtained, and the method is simple in process, convenient to operate and efficient.

The invention provides a ferric sodium pyrophosphate positive electrode material, a preparation method thereof and a sodium ion battery, and relates to the field of sodium ion batteries. The ferric sodium phosphate pyrophosphate positive electrode material comprises ferric sodium phosphate pyrophosphate and a coating layer located on the outer surface of the ferric sodium phosphate pyrophosphate, wherein the coating layer comprises conductive carbon and SiO2. The SiO2 in the coating layer can separate the ferric sodium pyrophosphate to achieve the effect of refining the size of the material, and the conductive carbon in the coating layer can achieve the effects of enhancing the conductivity and improving the rate capability. SiO2 and conductive carbon are matched with each other, so that the specific capacity and the rate capability of the positive electrode material can be improved.

The invention discloses a preparation method of a sodium ion positive electrode binder, which is characterized in that a carboxyl-containing olefine acid monomer is introduced into a vinylidene fluoride structure, so that a carboxyl group is embedded into the molecular structure of the binder, and the dual functions of neutralization and binding are realized. According to the method, through emulsion or suspension polymerization, the prepared binder can gradually neutralize alkaline residues of the sodium ion positive electrode material in the preparation of the positive electrode slurry, and the problems of acid-base imbalance and impurity residues caused by traditional additional organic acid are avoided, so that the jelling phenomenon is effectively inhibited. The embedded design simplifies the formula, improves the material purity, and significantly improves the fluidity and coating consistency of the slurry. In addition, the introduction of carboxyl improves the bonding performance of the binder, reduces the use amount of the binder, and increases the filling proportion of the active material, thereby improving the specific energy of the battery, reducing the internal resistance, enhancing the peeling strength of the pole piece, prolonging the cycle life of the pole piece, and showing excellent stability in the application of the sodium ion battery.

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 belongs to the technical field of magnesium air battery electrode materials, and particularly relates to a magnesium air battery anode material Mg-Sr-Ge ternary alloy which comprises the following components in percentage by mass: 0.1-2.0 wt% of strontium (Sr), 0.1-2.0 wt% of germanium (Ge) and the balance of magnesium (Mg). The preparation process comprises the following steps: weighing a pure magnesium ingot, high-purity germanium and an Mg-20Sr alloy according to the required proportion, and then smelting by using a vacuum induction furnace under the protection of argon; after smelting is completed, the alloy is cooled to the room temperature along with the furnace, and as-cast alloy is formed and can be directly used for a battery anode. Compared with a commercially available AZ31 anode material, the Mg-Sr-Ge ternary alloy anode disclosed by the invention shows higher discharge voltage, specific capacity and specific energy. The alloy material is low in preparation cost and simple in smelting process, can effectively improve the discharge performance of the magnesium air battery, and has a wide application prospect.

The invention discloses a preparation method and application of a sodium ion battery negative electrode material with improved conductivity, and belongs to the technical field of battery material preparation. The invention provides a preparation method of a sodium-ion battery negative electrode material, the chemical formula of the sodium-ion battery negative electrode material is MTiOPO4 (at) C. The preparation method comprises the following steps: dispersing a phosphorus source, an M source and a titanium source in a solvent A to obtain slurry A; dispersing a first carbon source and a second carbon source in a solvent B to obtain slurry B; mixing the slurry A and the slurry B, and performing pressure spray drying to obtain a precursor; and carrying out heat treatment on the precursor at a set temperature to obtain the sodium ion battery negative electrode material. Wherein the first carbon source is a carbon material containing a dotted structure, and the second carbon source is a carbon material containing a two-dimensional sheet structure. According to the invention, different conductive structures are arranged between the primary particles and the secondary particles, and through the design of the preparation process, the powder does not need to be crushed, so that relatively high electronic conductivity between the primary particles is ensured.

The invention relates to the technical field of thermal batteries, in particular to a high-specific-energy long-endurance thermal battery composite positive electrode material and a preparation method and application thereof.The composite positive electrode material is formed by compounding a high-capacity cobalt-based multi-component composite positive electrode material A and a high-conductivity cobalt-based multi-component composite positive electrode material B. Compared with traditional FeS2 and CoS2 positive electrode materials, the composite positive electrode material has the advantages that the specific energy of the composite positive electrode material is greatly improved; the material has the advantages of high pyrolysis temperature, good conductivity and high specific energy, and is suitable for high-specific-energy long-endurance thermal batteries.

The application belongs to the technical field of sodium batteries, and discloses a negative electrode-free sodium battery current collector and a preparation method and application thereof. The current collector comprises a current collector substrate, and a sodium sulfide / carbon composite interface coating loaded on the surface of the current collector substrate; the sodium sulfide / carbon composite interface coating comprises a sulfur-doped carbon matrix and sodium sulfide dispersed in the sulfur-doped carbon matrix; and the sodium sulfide / carbon composite interface coating is obtained by high-temperature calcination of sodium sulfide and carbon material. Through high-temperature composite reaction of sodium sulfide and hard carbon, the composite interface coating with both a sulfur-doped carbon guide phase and a residual sodium sulfide sodium compensation phase is obtained, the synergistic optimization of sodium deposition uniformity, dendrite inhibition capacity and active sodium compensation is realized, and the specific energy and cycle life of the battery are improved.

The present invention discloses a soft-packaged lithium carbon fluoride primary battery. The present invention is composed of a plurality of cylindrical pole groups, a non-aqueous electrolyte, a gel-containing pole ear and a soft outer shell; the plurality of cylindrical pole groups are in a parallel relationship with each other, and the cylindrical pole groups are multi-pole ears or foil pole ear structures that can quickly conduct current and heat, and the positive and negative pole sheets and diaphragms are tightly wound, so that the positive and negative poles are in close contact with the diaphragm throughout the discharge process; the F / C atomic ratio in the carbon fluoride is distributed in a gradient in the material particles, and the F / C atomic ratio of the outermost layer is close to 0, which solves the problem that conventional lithium carbon fluoride batteries cannot discharge at high power. The square lithium carbon fluoride battery provided by the present invention adopts a soft-packaged lightweight outer shell, has high specific energy and high safety characteristics, and the battery does not deform or expand significantly during the entire discharge process. During use, there is no need to use a high-strength outer shell and clamps for restriction, which greatly reduces the difficulty of combined application.

This invention discloses a full-ocean-depth metal-seawater fuel cell. The metal anode material mainly comprises one or more of the following components: Mg, Sn, B, La, Ce, Pr, Nd, Dy, Sm, Ti, and Ca, with the balance being Al. The electrolyte of this invention is a mixed aqueous solution of natural seawater, sodium stannate, zinc oxide, zinc sulfate, sodium carbonate, and cerium chloride, with the pH adjusted to between 12 and 14. The metal anode of this invention, in the above electrolyte, not only significantly reduces the hydrogen evolution corrosion rate but also directionally induces product formation, thereby improving electrochemical performance. The preparation method of this metal anode and electrolyte is simple, applicable to different temperature and pressure variations and operating current densities, and can be applied to metal-seawater fuel cells under various operating conditions at full ocean depth.

The present application belongs to the technical field of lithium primary battery, and particularly relates to a preparation method of lithium primary battery electrolyte, which comprises the following steps: dissolving lithium nitrate in acetone and fully stirring to make the lithium nitrate fully dissolved until the solution is clear and transparent; adjusting the lithium salt concentration in the solution to 1.5-2 mol / L; adding fluoroethylene carbonate and fully stirring until the solution is clear and transparent; in the solution, the volume ratio of fluoroethylene carbonate to acetone is 1:1-1:3; finally, adding propylene carbonate and fully stirring until the solution is clear and transparent; in the solution, the volume ratio of propylene carbonate to acetone is 1:2-1:4. The present application ensures that the electrolyte has high conductivity and can bear high efficient transportation of lithium ions, effectively increasing the discharge specific capacity and specific energy of the battery. In addition, the present application further provides a lithium primary battery electrolyte.

The invention relates to the technical field of sodium ion batteries, in particular to a preparation method of a gradient sodium ion battery. The preparation method of the gradient sodium ion battery comprises the following steps: preparing positive electrode slurry 1, positive electrode slurry 2, negative electrode slurry 1 and negative electrode slurry 2; sequentially coating two surfaces of an aluminum foil with the positive electrode slurry 1 and the positive electrode slurry 2 to obtain a positive gradient electrode; sequentially coating two surfaces of an aluminum foil with the negative electrode slurry 1 and the negative electrode slurry 2 to obtain a negative gradient electrode; and assembling the positive gradient electrode, the negative gradient electrode, the diaphragm and the electrolyte. The gradient sodium ion battery disclosed by the invention has excellent capacity retention ratio and cycle performance, meanwhile, the cycle performance of the gradient sodium ion battery is relatively excellent at low temperature, and most importantly, the occurrence of a sodium precipitation phenomenon is greatly reduced.

A method for preparing a lightweight lithium metal anode and a secondary battery are provided. The method for preparing the lightweight lithium metal anode includes: vapor-depositing a copper layer on at least one surface of a polymer film to obtain a polymer-assisted film; freezing the polymer-assisted film in a freezing device; feeding a lithium metal / lithium alloy strip and the frozen polymer-assisted film into a step-by-step cold rolling mill with the lithium metal / lithium alloy facing the copper layer, wherein a primary lithium metal anode is obtained by pressure bonding through a first cooling roller in the step-by-step cold rolling mill, and a secondary lithium metal anode is obtained by pressure bonding through a second cooling roller. This process allows for the mass production of lightweight lithium metal anodes.

The application provides a combined power generation system and a power distribution method thereof, the method comprising: collecting a voltage feedback signal of a load power supply bus, obtaining current power available values of a first power supply device and a second power supply device; generating a total power demand pre-command and a total power demand command; taking a low-frequency power command as a first power supply device power demand pre-command, and calculating a second power supply device power demand pre-command; outputting the first power supply device power demand command and the second power supply device power demand command according to the current power available value of the second power supply device; outputting the first power supply device power demand command to the first power supply device and outputting the second power supply device power demand command to the second power supply device; and repeating the above steps until the load stops consuming power. The power distribution system and method can correspond to the transient load of the load, absorb the feedback charge of the load, and ensure the stability of the power generation system and the normal operation of each load.

The present invention discloses an alkaline secondary battery zinc negative electrode material and a preparation method and application thereof, belonging to the technical field of alkaline secondary batteries. The technical scheme of the present invention is as follows: the alkaline secondary battery zinc negative electrode material is mainly composed of a ZnO / ZnS / C composite material or a metal-doped ZnO / ZnS / C composite material. The present invention also specifically discloses a preparation method of the zinc negative electrode material for an alkaline secondary battery and an alkaline secondary battery using the negative electrode material. The novel alkaline secondary battery negative electrode material of the present invention can reduce the deformation of the zinc electrode, inhibit the growth, hydrogen evolution, and passivation of zinc dendrites, improve the stability of the zinc negative electrode in alkaline solution, and greatly improve the cycle life of the alkaline secondary battery.

The invention discloses a preparation method of a thermal battery electrolyte for an automatic press and belongs to the technical field of thermal batteries. The method comprises the following steps: mixing magnesium oxide and fused salt, and calcining; the obtained electrolyte block is subjected to airflow crushing to form an electrolyte semi-finished product; fully stirring and mixing the electrolyte semi-finished product, performing vacuumizing treatment, and taking out the electrolyte semi-finished product after the electrolyte semi-finished product is vacuumized to a certain vacuum degree; and carrying out secondary calcination on the obtained semi-finished product, and then carrying out airflow pulverization to obtain an electrolyte finished product. Through secondary homogenization treatment on the electrolyte powder, the prepared electrolyte powder is high in particle size concentration ratio and good in fluidity, and is suitable for pressing an oversized and ultrathin electrolyte sheet by an automatic press, so that the specific energy and the specific power of the thermal battery are improved, and the use scene of the thermal battery is widened.

The application discloses a kind of composite electrode and its preparation method and metal lithium battery.The composite electrode includes negative electrode, positive electrode and current collector, the current collector is located between positive electrode and negative electrode;The negative electrode includes metal lithium composite material layer, the metal lithium composite material layer includes granular double-skeleton lithium carbon composite material, the double-skeleton lithium carbon composite material has lithium boron particle as core, the core has lithium boron alloy structure skeleton and active lithium, three-dimensional porous carbon skeleton space layer formed by nano carbon material is arranged on the surface of the core, lithium boron alloy structure skeleton and carbon skeleton space layer formed by carbon material constitute double skeleton.The composite electrode has small volume change, long cycle life and can resist high temperature above 200 DEG C, is one of the candidate electrodes of power battery.

The invention discloses a lithium-sulfur battery system with constant voltage output, which comprises at least one lithium-sulfur battery pack, each lithium-sulfur battery pack is connected with a DC / DC converter for voltage stabilization and then is connected in series and / or in parallel, each lithium-sulfur battery pack comprises a box body and at least one lithium-sulfur battery soft package battery cell monomer arranged in the box body, each lithium-sulfur battery soft-package battery cell monomer is connected with the DC / DC converter for voltage stabilization, and the lithium-sulfur battery soft-package battery cell monomers are connected in series and / or in parallel to form the lithium-sulfur battery pack. The assembling method of the lithium-sulfur battery pack in the lithium-sulfur battery system is simple, the module weight is reduced, the lithium-sulfur battery pack or the lithium-sulfur battery system can be modularly designed according to actual application scenes, the output voltage of a power supply can be dynamically adjusted according to the requirements of third-party equipment, the popularization and application of lithium-sulfur battery products are effectively improved, and the application prospect is wide. Commercialized application of the lithium-sulfur battery is effectively promoted, and replacement of a traditional lithium ion battery can be realized to a certain extent.

The invention relates to the field of storage batteries, in particular to an aluminum-based mixed material prefabricated punched grid and a storage battery prepared thereof.The aluminum-based mixed material prefabricated punched grid comprises an aluminum plate base body, a plurality of punched holes are prefabricated in the aluminum plate base body, and lead-tin alloy plating layers are arranged on the surfaces of the aluminum plate base body and the punched holes of the aluminum plate base body; the surface of the aluminum plate base body provided with the plating layer is provided with a concave-convex structure formed through crease concave-convex treatment, the thickness of the aluminum plate base body ranges from 0.4 mm to 1.5 mm, the thickness of the lead-tin alloy plating layer ranges from 5 micrometers to 10 micrometers, and in the lead-tin alloy, the mass percent of lead ranges from 50% to 60%, and the mass percent of tin ranges from 40% to 50%. According to the aluminum-based mixed material prefabricated punched plate grid and the storage battery prepared from the aluminum-based mixed material prefabricated punched plate grid, the mode that the lead-tin alloy is electroplated on the aluminum plate base body is adopted, the light weight and high conductivity of aluminum and the acid resistance of the lead alloy are achieved, and therefore the weight and cost of the storage battery are greatly reduced, the specific energy of the storage battery is improved, and the cycle life of the storage battery is prolonged.

The invention discloses an electrolyte of a neutral aqueous zinc air / iodine hybrid battery, which is a neutral electrolyte and comprises a zinc source, an iodine source and a conductive additive. The invention also discloses a positive electrode of the neutral aqueous zinc air / iodine hybrid battery, and the positive electrode is a FeN particle-loaded porous carbon positive electrode material obtained by calcining a metal organic framework formed by bimetallic (Fe, Zn) and aminoantipyrine at a high temperature. The invention also discloses a neutral aqueous zinc air / iodine hybrid battery comprising the neutral electrolyte and a porous carbon positive electrode material loaded with FeN particles. The neutral aqueous zinc air / iodine hybrid battery constructed by the electrolyte and the positive electrode provided by the invention realizes reversible and stable conversion of oxygen species and iodine species under a neutral condition, and has excellent specific capacity and cycling stability.

This invention relates to a eutectic salt for thermal batteries, belonging to the field of electrochemical technology. The eutectic salt for thermal batteries of this invention comprises LiCl, LiBr, LiF, and BaCl2, with the following mass percentage contents: LiCl 11%–20%, LiBr 50%–70%, LiF 6%–12%, and BaCl2 16%–30%. This invention uses a LiCl-LiBr-LiF-BaCl2 eutectic salt with a melting point of 421.6℃. This is approximately 18.2℃ lower than the commonly used LiCl-LiBr-LiF eutectic salt (melting point 439.8℃). This invention has the following significant advantages: First, using the eutectic salt of this invention as an electrolyte in thermal batteries can extend the operating temperature range of the thermal battery, thus extending its thermal life and operational life. Second, the lower melting point reduces the amount of heating agent required, while simultaneously improving the specific energy and safety of the thermal battery. Third, this eutectic salt retains the high conductivity advantage of the LiCl-LiBr-LiF eutectic salt.

The invention discloses a high-specific-energy fully-sealed rectangular lithium ion battery which comprises an outer layer, a diaphragm arranged in the outer layer, a heat storage layer arranged in the diaphragm, an adjusting mechanism arranged in the heat storage layer, an electrolyte system arranged in the adjusting mechanism and heat insulation mechanisms arranged at the two ends of the electrolyte system. The heat storage layer comprises a hollow sleeve, heat storage salt filled in the hollow sleeve, a plurality of second heat conduction strips arranged on the inner side of the hollow sleeve at equal intervals, a second groove formed in the inner wall of one side of the hollow sleeve and cooling fins attached to the inner wall of the second groove. The adjusting mechanism comprises a plurality of first heat conduction strips and heat insulation strips which are connected with the first heat conduction strips in a staggered manner. The high-specific-energy fully-sealed rectangular lithium ion battery disclosed by the invention has the effects of guaranteeing the chemical reaction speed of the lithium ion battery in a cold air environment and directly optimizing the high specific energy of the lithium ion battery.

This invention provides a structural electrode, its fabrication method, and a structural battery based on a Kevlar fiber-reinforced current collector. The structural electrode includes a Kevlar fiber-reinforced current collector and an electrode material layer disposed on its surface. The Kevlar fiber-reinforced current collector is a modified Kevlar fiber layer modified with a conductive metal, obtained by modifying Kevlar fibers with trimethylchlorosilane. The Kevlar fiber-reinforced current collector in this invention has higher mechanical strength than traditional metal foil current collectors, thereby improving the mechanical strength of the structural electrode prepared using this current collector. The structural electrode of this invention can effectively alleviate volume expansion and stress accumulation, ensuring high specific energy of the battery while improving cycle stability. The structural battery of this invention adopts an integrated continuous packaging method. Through the mechanical coupling between the packaging shell and the structural electrode, the load is continuously transferred between the internal cell and the external packaging, improving the mechanical performance of the structural battery.

The invention relates to the field of sodium-ion batteries, and discloses a flexible negative pole piece, a preparation method thereof, a sodium-ion battery and an application of the sodium-ion battery. The negative electrode plate comprises a negative electrode current collector and a negative electrode material covering at least one surface of the negative electrode current collector; the negative electrode material comprises a flexible carbon nanofiber layer and MoS2 loaded on the surface of the flexible carbon nanofiber layer, wherein the flexible carbon nanofiber layer comprises carbon nanofibers and Ge (germanium). The negative electrode plate shows a flexible characteristic, and the prepared sodium ion battery shows excellent rate capability and stable cycle performance.

Transition metal chloride has the advantages of being good in thermal stability, high in discharge voltage, high in theoretical specific capacity and the like, but the conductivity of the transition metal chloride is poor, and the difference between the actual discharge performance and the theoretical value is large. Therefore, the material is difficult to apply on a large scale in thermal batteries. As a common thermal battery positive electrode material, the transition metal disulfide has good conductivity and long working time, and the development of the transition metal disulfide is limited by lower decomposition temperature and specific energy. The composite positive electrode material prepared from the transition metal chloride and the transition metal disulfide has relatively high thermal stability, and the specific energy of the positive electrode of the thermal battery can be effectively improved by utilizing the high voltage of the chloride in the early stage and a relatively long and stable voltage platform of the disulfide to form a relay reaction.

The invention provides a negative electrode active material, the negative electrode active material comprises a silicon-containing material and lithium lanthanum titanium oxide, the silicon-containing material has a three-dimensional porous structure, the lithium lanthanum titanium oxide is embedded into pores of the silicon-containing material, the chemical formula of the lithium lanthanum titanium oxide is Li3xLa (2 / 3)-xTiO3, and the value range of X is 0 < x < (2 / 3); the lithium lanthanum titanium oxide is embedded into the pores of the silicon-containing material with the three-dimensional porous structure, the silicon-containing material and the lithium lanthanum titanium oxide form tight interface contact, a mixed ion electron conductor of the silicon-containing material and the lithium lanthanum titanium oxide can be formed when the battery is charged and lithium is embedded, and the electron conductivity of the silicon-containing material and the lithium lanthanum titanium oxide is enhanced; on one hand, the internal resistance of the battery cell is reduced, and on the other hand, the silicon-based material selectively adsorbs more LLTO and is embedded in the LLTO, so that the volume expansion of silicon particles is effectively buffered, the repeated growth of an SEI film is solved, the capacity exertion and cycle life of the lithium ion battery are improved, the negative electrode with higher silicon content is applied to the battery, and the specific energy of the battery is improved; and the requirements of the market on high-energy-density batteries are met.