392results about How to "Improve electrochemical performance" patented technology

The invention relates to an S-doped g-C3N4 coated modified graphite material, a preparation method thereof and a lithium ion battery negative electrode. The method comprises the following steps: mixing a g-C3N4 precursor with a sulfur source, and then carrying out heat treatment under the condition of shielding gas to obtain sulfur-doped graphite phase carbon nitride S-g-C3N4; carrying out plasma modification treatment on the surface of the graphite material by adopting plasma reaction gas to obtain modified graphite; mixing S-g-C3N4 with the modified graphite to obtain a mixed material; and calcining the mixed material in a protective gas environment to obtain the S-doped g-C3N4 coated modified graphite material. The invention also provides the graphite material prepared by the method and a lithium ion battery negative electrode prepared from the graphite material. The graphite material has relatively high conductivity, interface compatibility and structural stability.

The invention discloses petroleum coke, a silicon carbon material, a silicon composite negative electrode material and a preparation method thereof. The preparation method comprises the following steps: carrying out first solid removal treatment on a first heavy oil raw material to obtain first purified heavy oil; carrying out second solid removal treatment on the second heavy oil raw material to obtain second purified heavy oil; mixing the second purified heavy oil with nano-porous silicon to obtain third purified heavy oil and heavy oil containing nano-porous silicon; carrying out spray granulation on the heavy oil containing the nano porous silicon to obtain a silicon-carbon precursor and fourth purified heavy oil; mixing the third purified heavy oil, the fourth purified heavy oil and the first purified heavy oil to obtain heavy mixed oil; carrying out distillation, pyrolysis and modification treatment on the heavy mixed oil to obtain petroleum coke; carbonizing the silicon-carbon precursor to obtain a silicon-carbon material; the silicon composite negative electrode material is prepared from petroleum coke and a silicon carbon material. The petroleum coke and the silicon carbon material with relatively high quality can be prepared, and the electrochemical performance of the negative electrode material can be improved.

This application relates to the field of solar cell technology, and more particularly to solar cells and their fabrication methods. The fabrication method of the solar cell includes the steps of: providing a solar cell having a first surface and a second surface disposed opposite to each other; performing a first printing, a second printing, and a third printing on the first surface sequentially; the first printing includes printing main grid lines; the second printing includes printing fine grid lines; and the third printing includes printing harpoon lines and / or border lines. The printing paste used for the third printing is a corrosive paste. This application adds a third printing step to print harpoon lines and border lines on the first surface of the solar cell, thus printing the harpoon lines and border lines separately from the main grid lines. Furthermore, the use of a corrosive paste in the third printing increases the current collection capacity in the harpoon line region, avoids clouding phenomena at the edge areas of the solar cell, and thereby improves the electrochemical performance of the solar cell.

The application relates to the technical field of batteries, in particular to a hard carbon negative electrode material and a preparation method and application thereof. A preparation method of a negative electrode hard carbon material comprises the following steps: carrying out first heat treatment on a mixture of an organic metal catalyst and biomass activated carbon, introducing a gas-phase carbon source and carrying out second heat treatment to obtain first material, and carrying out carbonization treatment and acid pickling treatment on the first material. The method can improve the capacity and initial efficiency of the hard carbon negative electrode material through cooperation of various steps; the method is simple in process and easy to realize large-scale production.

The application discloses an electrode material based on MOF@COF / BC and application thereof in wastewater treatment and belongs to the technical field of wastewater treatment. The electrode material is prepared by the following method: NH2-MIL101(Fe), melamine and phthalocyanine molybdenum are dissolved in dimethyl sulfoxide, reaction is carried out at 160-200 DEG C for 10-14 h, the precipitate is collected after reaction, and washing, drying are carried out to prepare NH2-MIL101(Fe)@Mel-MoPc; the biochar and NH2-MIL101(Fe)@Mel-MoPc are mixed in deionized water, ultrasonic treatment is carried out for 8-12 min, stirring is carried out for 10-14 h, then the precipitate is collected by centrifugation, and washing, drying are carried out to prepare the electrode material. The application develops and designs a novel electrode material, which is used for electrocatalytic activation of peroxymonosulfate to degrade OFX wastewater, and the degradation efficiency of the OFX wastewater is greatly improved.

This invention relates to the field of secondary battery technology, specifically to a silicon-carbon composite material, its preparation method, and a lithium-ion battery. The preparation method of the silicon-carbon composite material includes: reacting an organometallic framework ZIF-8 in a saturated metal salt solution and then evaporating and crystallizing it to obtain a metal salt-coated organometallic framework Salt@ZIF-8; pulverizing a silicon-copper alloy precursor and the Salt@ZIF-8 at a mass ratio of 1:0.05-0.7 to obtain a mixed powder; and subjecting the mixed powder to a pyrolysis reaction and acid leaching treatment to obtain the silicon-carbon composite material. The silicon-carbon composite material obtained by this invention exhibits excellent structural stability and electrochemical performance, effectively mitigating the volume expansion of the silicon anode and improving cycle performance and rate performance.

This invention belongs to the field of hard carbon technology, specifically relating to a bamboo-based and lignin-based hard carbon composite material, its preparation method, and its applications. The process involves pretreating raw materials to obtain pretreated material; pretreating the pretreated material with an acidic oxidant to obtain acidic oxidant pretreated material; pre-oxidizing the acidic oxidant pretreated material to obtain pre-oxidized material; pre-carbonizing the pre-oxidized material under a protective atmosphere to obtain pre-carbonized material; pulverizing the pre-carbonized material to obtain pulverized material; acid washing followed by water washing to obtain purified material; soaking the purified material in acid, filtering, and drying to obtain soaked material; mixing the soaked material with a modifier, and high-temperature coating and carbonizing under a protective atmosphere to obtain bamboo-based coated hard carbon or lignin-based coated hard carbon. Mixing the two types of hard carbon and carbon coating yields a bamboo-based and lignin-based hard carbon composite material, which is used in negative electrode sheets and batteries. When applied to batteries, the hard carbon composite material of this invention can improve battery energy density.

The invention provides a composite positive plate, a preparation method thereof and a battery, and belongs to the technical field of batteries. The interface conductive layer is arranged on at least one side of the positive electrode active material layer, and the interface conductive layer comprises conductive filler and an elastic matrix. According to the composite positive plate, the interface conductive layer with conductivity, flexibility and elasticity is arranged on at least one side of the positive active material layer, so that when the composite positive plate is applied to the battery and the interface conductive layer is close to one side of the diaphragm, not only can the interface impedance be reduced, but also the wettability of electrolyte on the positive active material layer can be improved; when the interface conducting layer is close to one side of the shell, the positive electrode active material layer can be better protected, extrusion damage of the shell to the positive electrode active material layer is reduced, the interface conducting layer can serve as a current collector, the electrochemical performance of the battery is improved, and the interface conducting layer can adapt to volume expansion of the composite positive plate in the charging and discharging process of the battery and improve the cycle performance of the battery.

The invention relates to the technical field of lithium battery positive electrode material preparation, in particular to coated doped type lithium manganese iron phosphate gradient temperature control preparation equipment and method.The equipment comprises five temperature control bins arranged side by side, a sintering bin, a vertical flow guide plate, a unique temperature control gas inlet assembly and the like work cooperatively, the temperature control gas inlet assembly can flexibly adjust the gas state, and the temperature control gas inlet assembly can control the temperature of the lithium manganese iron phosphate; the preparation method comprises the following steps: firstly, mixing a lithium source, a manganese source and the like with a specific composite carbon source, and performing spray drying to obtain precursor particles; according to the preparation method, the defects of a traditional preparation technology in the aspects of temperature control and coating forming are overcome, accurate gradient temperature control can be achieved, the temperature uniformity can be improved, the coating effect can be optimized, and the preparation method is suitable for industrial production. And the performance of the lithium manganese iron phosphate positive electrode material is remarkably improved.

The application discloses a novel proton battery positive electrode material and a preparation method thereof. Iron source solution and phosphorus source solution are respectively prepared through an organic solution, and then the two solutions are mixed to perform a solvothermal reaction. After that, the product obtained in the reaction is washed and dried to obtain the novel proton battery positive electrode material. The material can be used to prepare a proton battery positive electrode sheet. The novel proton battery positive electrode material prepared by the application is a nanoparticle, the main component of which is iron phosphate. The particle morphology is uniform, and the specific surface area is large. The size of the particle is 50.0-200.0 nm. The proton battery prepared by using the novel proton battery positive electrode material has good electrochemical performance. The preparation method provided by the application is simple in process, raw materials are easy to obtain, and is suitable for large-scale industrial production.

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 petroleum coke, a non-graphite carbon material, a negative electrode material and a preparation method thereof. The method comprises the following steps: performing first solid removal on a first heavy oil raw material to obtain first purified heavy oil; performing second solid removal on the second heavy oil raw material to obtain second purified heavy oil; mixing the second purified heavy oil with nano-porous carbon to obtain third purified heavy oil and heavy oil containing the nano-porous carbon; carrying out solid-liquid separation on the heavy oil containing the nano-porous carbon to obtain a non-graphite carbon material precursor and fourth purified heavy oil; mixing the third purified heavy oil, the fourth purified heavy oil and the first purified heavy oil to obtain heavy mixed oil; carrying out distillation, pyrolysis and modification treatment on the heavy mixed oil to obtain petroleum coke; carbonizing the non-graphite carbon material precursor to obtain a non-graphite carbon material; the negative electrode material is prepared from petroleum coke and a non-graphite carbon material. The petroleum coke and the non-graphite carbon material with relatively high quality are prepared, and the electrochemical performance of the negative electrode material can be improved.

The invention belongs to the field of carbon-based electrode materials, and discloses a three-dimensional structure graphene material loaded with phosphorus-doped carbon nitride quantum dots as well as a preparation method and application of the three-dimensional structure graphene material. The three-dimensional structure graphene material is prepared through a simple hydrothermal reaction, phosphorus-doped carbon nitride quantum dots are uniformly dispersed on a graphene sheet layer, and nitrogen and phosphorus are successfully introduced into graphene through in-situ loading of the phosphorus-doped carbon nitride quantum dots. The graphene material with the three-dimensional structure integrally presents a good self-supporting three-dimensional skeleton structure, an electrode can be directly prepared under the condition that a conductive agent and a binder are not added, and the supercapacitor taking the graphene material with the three-dimensional structure loaded with the phosphorus-doped carbon nitride quantum dots as the electrode shows excellent electrochemical performance; wide application prospects are realized in the fields of electrode materials and energy storage devices.

The application relates to the technical field of sodium ion battery positive electrode materials, in particular to a Na2Fe2(SO4)3@Na3Fe2(SO4)3F@CNT positive electrode material.The Na2Fe2(SO4)3 and Na3Fe2(SO4)3F precursors are mixed and sintered, and are coated by CNT, so that the electrochemical performance of the Na2Fe2(SO4)3 is remarkably improved, the conductivity of the material is improved, the material can be used as a sodium ion battery positive electrode material, has a high discharge specific capacity, and has cycle performance and rate performance.

This invention belongs to the field of lithium-sulfur battery technology, providing a zirconium-based flexible carbon nanofiber membrane, its preparation method, a lithium-sulfur battery cathode, and a lithium-sulfur battery. The preparation method involves mixing a zirconium source, a polymer, and an organic solvent to form a spinning solution; the spinning solution is electrospun to obtain a fiber membrane; the fiber membrane is then carbonized to obtain the zirconium-based flexible carbon nanofiber membrane. This invention yields a zirconium-based flexible carbon nanofiber membrane with high conductivity, a well-structured microstructure, and active sites for zirconium-based compound nanoparticles. The zirconium-based flexible carbon nanofiber membrane with its well-structured microstructure and active sites for zirconium-based compound nanoparticles exhibits excellent chemical / physical adsorption characteristics for polysulfides. Simultaneously, the zirconium-based compound nanoparticles possess excellent electrocatalytic properties, accelerating efficient conversion between polysulfides, achieving efficient electron transfer and ion diffusion, and realizing high sulfur utilization. This results in excellent areal capacity electrochemical performance. When used as a cathode in lithium-sulfur batteries, it enables the lithium-sulfur battery to exhibit outstanding rate performance and cycle stability, promoting the development of lithium-sulfur batteries towards low-altitude economic applications. Furthermore, the zirconium-based flexible carbon nanofiber membrane, when combined with a high-sulfur-loaded sulfur cathode (greater than 6 mg / cm³), further enhances the effectiveness of the process. 2 Together, they constructed a novel "sandwich" sulfur cathode, resulting in a high-capacity lithium-sulfur battery.

The present disclosure provides a high-rate lithium iron phosphate positive electrode material comprising lithium iron phosphate and carbon coated on a surface of the lithium iron phosphate, wherein a primary particle of the material has a particle size of 30-70 nm. The material of the present disclosure has a small and uniform primary particle size, no large single crystal particles, and a high specific surface area, and the battery prepared with the material has a high capacity, good cycle performance, excellent rate performance and low temperature performance. The present disclosure also provides a method for preparing the high-rate lithium iron phosphate positive electrode material, which has a simple process, is environmentally friendly, does not need precursors or expensive equipment, and has low cost.

This invention belongs to the field of composite electrode materials technology, and relates to a method for preparing a NiCoCu selenide composite MXene / carbon sphere thin film electrode material, comprising: first, dissolving ZIF-67 powder in a carbon sphere solution, then adding an MXene aqueous solution, stirring for 1-10 hours, filtering and drying to obtain ZIF-67@MXene / CS; second, preparing a solution according to the proportion of urea, copper source, nickel source and ethanol, immersing ZIF-67@MXene / CS, and reacting hydrothermally to obtain a NiCoCu-LDH@MXene / CS thin film; third, mixing the NiCoCu-LDH@MXene / CS thin film, selenium powder and sodium borohydride in a mass ratio of 0.5-1:1-2:1-2, reacting at 150-180°C for 12-24 hours, washing the obtained product with deionized water and drying to obtain the final product. MXene and carbon spheres together provide a flexible substrate for the self-supporting material, increasing its conductivity and specific surface area. Simultaneously, NiCoCu-Se intercalation into the MXene acts as an intermediate buffer, preventing MXene self-stabilization and making its structure more stable. When applied as the positive electrode material for supercapacitors, the self-supporting material avoids the use of binders, reducing the material's impedance and improving electrochemical performance.

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 application belongs to the technical field of negative electrode materials, and particularly relates to a negative electrode active material, a preparation method thereof, a secondary battery and an electric device. The negative electrode active material provided by the application comprises a silicon-based material with a carbon layer arranged on at least part of the surface and a titanium-containing compound layer containing nitrogen arranged on the surface of the carbon layer. The titanium-containing compound layer containing nitrogen makes the negative electrode active material have more advantages in electrical conductivity and lithium ion transmission speed than a pure titanium-containing compound, and thus a lithium ion battery using the negative electrode active material has better electrochemical performance.

This invention relates to the field of sodium-ion battery technology, and discloses a sodium-ion cathode material, its preparation method and application, a sodium-ion battery, a sodium-ion battery pack, and a device. The sodium-ion cathode material includes a matrix and a coating layer covering the matrix; the matrix has the composition shown in Formula I: Na 1‑x [Ni y Mn z M u Ti v O2 Formula I; the coating layer has the composition shown in Formula II: Na 2‑β Ti 6‑α M′ α O 13 Formula II. This sodium-ion cathode material possesses characteristics such as high ionic and electronic conductivity, strong structural stability, and strong chemical stability. Furthermore, using this composite cathode material in sodium-ion batteries can effectively improve the battery's electrochemical performance.

The application discloses an integrated stretchable flexible wearable biosensor and a preparation method thereof, and belongs to the technical field of electrochemical sensing.The integrated stretchable flexible wearable biosensor is wrapped by a PAN / SiO2 sweat absorption layer.The method comprises the following steps: preparing a stretchable conductive composite fiber; preparing an integrated stretchable flexible sensing fiber; preparing a PAN / SiO2 sweat absorption layer; and preparing a sensor.The conductive composite fiber in the application can maintain stable performance under multiple bending and twisting, the sensor is integrated with a flexible integrated circuit chip and a flexible power supply device to obtain a fabric sensing system, the fabric sensing system can process acquired sensor data, and the detection data can be uploaded to a mobile terminal and a cloud end in real time through Bluetooth technology, real-time monitoring and management of a health condition of the biosensor are realized, six specific biomarkers can be efficiently detected by using only 1 muL of sweat, the amount of sweat required for activating the biosensor is 1 / 3 of that of the prior art, and the fabric sensing system can easily adapt to a tensile strain caused by exercise.

The application relates to a highly-ordered porous sulfur / oxygen co-doped carbon sphere and a preparation method and a potassium ion battery thereof, and belongs to the technical field of battery materials. The application discloses a preparation method of a highly-ordered porous sulfur / oxygen co-doped carbon sphere. The carbon sphere is prepared by mixing sulfur powder and resin material, the prepared carbon sphere is uniformly doped with atoms, the pore size distribution is uniform, the number of potassium storage sites is relatively large, and the carbon sphere can be applied to a potassium ion battery. The application further discloses a potassium ion battery. The active material of the potassium ion battery comprises the highly-ordered porous sulfur / oxygen co-doped carbon sphere. The potassium ion battery can be a half battery assembled by a negative electrode material containing the highly-ordered porous sulfur / oxygen co-doped carbon sphere and metal potassium. The potassium ion battery can also be a full battery assembled by the negative electrode material containing the highly-ordered porous sulfur / oxygen co-doped carbon sphere and a prussian blue positive electrode material.

The invention relates to the technical field of waste battery recovery, and particularly discloses a direct regeneration method of a high-performance waste lithium iron phosphate battery material. The materials comprise waste lithium iron phosphate, lithium carbonate, soluble salt corresponding to magnesium or titanium, graphene, a glucose reducing agent, an adaptive organic solvent and the like; the method comprises the following steps: pretreating the waste battery, calcining to prepare an oxidation precursor, respectively preparing an ion dopant solution and a graphene dispersion liquid, sequentially mixing the raw materials, carrying out wet ball milling, drying and inert atmosphere preheating, and synchronously carrying out oxidation precursor reduction, ion doping and graphene compounding through high-temperature reduction. The regenerated lithium iron phosphate material can be used in the fields of electric vehicle power batteries, high-end energy storage systems and the like, and has the advantages of excellent electrochemical performance, structural stability and compaction performance; the method provided by the invention has the advantages of controllable operation, flexible raw material adaptation and high-valued recovery of waste materials, and can effectively improve the performance shortages existing in the traditional process.

The utility model relates to the technical field of batteries, and discloses a winding battery cell and a battery. The winding battery cell is provided with a straight area and an arc area, and comprises a positive plate, a diaphragm and a negative plate; the positive plate comprises a current collector, a first active material layer and a second active material layer, the tail part of the second active material layer exceeds the tail part of the first active material layer in the winding direction of the winding cell, a first junction region is formed at the tail part of the first active material layer, and a second junction region is formed at the tail part of the second active material layer; the first active material layer at the first junction region is partially or completely removed, the second active material layer at the second junction region is partially or completely removed, and the first junction region and the second junction region are both located in a straight region. The first junction region and the second junction region are arranged in the straight region of the winding battery cell, and the expansion of the flush region is smaller than that of an arc region, so that the pole piece breakage condition in the battery cell circulation process is improved, and the battery cell circulation performance and the energy density are improved.

The invention discloses a C, N-FeNbO4 / NF microrod based on foamed nickel in-situ 001 crystal face derivation and a derivation method and application thereof, and the method comprises the following steps: in a hydrothermal reaction, hydrolyzing urea to release OH-to replace oxalate in niobium oxalate so as to form a Nb-OH monomer; meanwhile, Fe < 3 + > is hydrolyzed into Fe (OH) 3 colloid; the preparation method comprises the following steps: performing liquid phase nucleation on Nb-OH and Fe (OH) 3 under a hydrothermal condition to form a FeNbO4 precursor, and growing the FeNbO4 precursor on foamed nickel (NF) in situ; in this way, the 001 crystal face of FeNbO4 is accurately regulated and controlled through the strong coordination effect of F <-> to form a rod structure. Under high-temperature (900 DEG C) carbonization, the FeNbO4 is further crystallized into an acid-resistant and alkali-resistant monoclinic crystal type three-dimensional microrod (C, N-FeNbO4 / NF) with C and N co-doped (C, N-FeNbO4) composite NF. According to the method disclosed by the invention, the agglomeration phenomenon of FeNbO4 is relieved; the microrod structure exposes more catalytic active sites, so that the catalytic activity is improved. In addition, the catalyst shows high conductivity by co-doping C and N with synergistic high-conductivity NF. Based on the regulation and control, the C, N-FeNbO4 / NF shows good electrochemical performance in the oxygen evolution reaction.

The invention discloses a battery fiber of an ultraviolet curing electrolyte as well as a preparation method and application of the battery fiber. The battery fiber comprises an electrode fiber core, a gel electrolyte layer and a polymer encapsulation layer from inside to outside. The electrode fiber core is formed by twisting and compounding a positive electrode fiber and a negative electrode fiber; the gel electrolyte layer is formed by curing a precursor containing a photocuring monomer, a photoinitiator, a linear polymer and a lithium salt through ultraviolet irradiation. According to the preparation method, a stable gel electrolyte layer is rapidly constructed on the surface of the fiber at normal temperature through an ultraviolet curing technology, so that the potential safety hazard that a traditional liquid electrolyte is easy to leak is solved, an electrode-electrolyte interface is also remarkably optimized, and the interface impedance is reduced. The obtained battery fiber has excellent flexibility, high safety and good electrochemical performance, the slender one-dimensional form of the battery fiber can be directly woven into an intelligent fabric through a textile technology, and an ideal flexible embedded power supply solution is provided for wearable electronic equipment.

The application provides a method for repairing failed lithium iron phosphate in situ, comprising: separating positive electrode black powder from a positive electrode sheet of a waste lithium iron phosphate battery; obtaining a lithium vacancy rate, a Li-Fe anti-site defect value and a ratio of Fe 3+ / Fe 2+ in a lithium iron phosphate crystal lattice to be repaired in the positive electrode black powder, and evaluating the failure degree of the lithium iron phosphate to be repaired; according to the element content in the positive electrode black powder and the failure degree of the lithium iron phosphate to be repaired, selectively supplementing a lithium source and / or a carbon source, and then heat treating to achieve adaptive repair and regeneration. The method for repairing failed lithium iron phosphate in situ provided by the application realizes lithium vacancy supplement, Fe 3+ reduction, carbon coating layer reconstruction and precise material supplement control, so that the repaired lithium iron phosphate material is pure in phase, controllable in crystal lattice defect, and the first coulomb efficiency, cycle stability and rate performance all reach or are close to the level of commercial lithium iron phosphate.

The invention relates to the technical field of secondary batteries, in particular to a temperature self-adjusting electrode and a secondary battery. The electrode comprises an active material and a composite phase change material, wherein the composite phase change material comprises a first phase change microcapsule and a second phase change microcapsule; wherein the phase change temperature t1 of the first phase change microcapsule is more than or equal to 5 DEG C and less than or equal to 45 DEG C, and the phase change enthalpy Q1 is 100-235J / g; the phase change temperature t2 of the second phase change microcapsule is 20 DEG C lt; t2-t1 < = 155 DEG C, and the phase change enthalpy Q2 meets the following condition: Q2-Q1 < = 200J / g is greater than or equal to 5J / g. According to the electrode provided by the invention, temperature self-adjustment under different working conditions is realized, temperature change is controlled, the service life of the battery under a wide temperature range working condition is prolonged, and meanwhile, thermal runaway of the battery is prevented.

This invention discloses an MXene-based anode material, its preparation method, and its applications, belonging to the field of battery technology. The MXene-based anode material provided by this invention is obtained by grafting benzaldehyde with aminated MXene. This invention utilizes the potential active sites on the surface of aminated MXene, grafting it with benzaldehyde. This imparts a larger interlayer spacing to the material without destroying its special layered structure, significantly improving the material's structural stability and oxidation resistance, accelerating sodium ion transport kinetics, and improving its rate performance and long-cycle stability as an anode material, greatly enhancing its long-term fast charge-discharge capability. This invention utilizes the synergistic effect of two modification strategies, "amination" and "benzaldehyde grafting," to significantly improve the electrochemical performance of the MXene-based anode material, thereby obtaining a high-performance anode and sodium-ion battery.

The invention provides an aqueous cadmium ion-vanadium dioxide battery as well as a preparation method and application thereof, and relates to the field of ocean energy storage. The battery comprises a negative electrode, a positive electrode, a diaphragm and an aqueous electrolyte, the negative electrode is metal cadmium or cadmium-based alloy; the active material of the positive electrode is metastable monoclinic phase vanadium dioxide; the diaphragm is a glass fiber diaphragm; the aqueous electrolyte is an aqueous solution containing cadmium salt; the total concentration of the cadmium salt in the aqueous electrolyte is 1-4 mol / L. The aqueous vanadium dioxide-cadmium metal secondary battery disclosed by the invention has the advantages of safe aqueous electrolyte system, high rate capability, ultra-long cycle life and the like, and has remarkable advantages when being applied to ocean energy storage.