182results about How to "Improve battery performance" patented technology

The embodiment of the invention relates to the technical field of batteries, and provides a preparation method of a lithium ion battery, which comprises the following steps: winding or laminating a positive plate, a negative plate and a diaphragm, and putting into a shell to form an initial battery cell; in the step of the first liquid injection process, a first electrolyte is injected into the initial battery cell, and the first electrolyte comprises the following components: 0.5 wt%-2wt% of vinylene carbonate, 5wt%-15wt% of lithium salt and a non-aqueous organic solvent; performing a formation process on the initial battery cell; in the step of the second liquid injection process, a second electrolyte is injected into the initial battery cell, and the second electrolyte comprises the following components: 5wt%-20wt% of vinylene carbonate, 5wt%-15wt% of lithium salt, 0.005 wt%-30wt% of an infiltration stabilizer and a non-aqueous organic solvent; wherein the first electrolyte or the second electrolyte further comprises at least one of 1, 3-propane sultone or fluoroethylene carbonate, so that the lithium ion battery is at least favorably kept to have high energy efficiency and long cycle life under the condition of low liquid injection amount.

The invention belongs to the field of air electrode materials of zinc-air batteries, and particularly relates to a self-supporting electrode and a preparation method and application thereof. The invention discloses a self-supporting electrode. The self-supporting electrode comprises a conductive substrate, a nitrogen-doped carbon nanotube and FeNi3 particles distributed in the nanotube, the nitrogen-doped carbon nanotubes grow on the surface of the conductive substrate. According to the self-supporting electrode provided by the invention, nickel has high OER catalytic activity, meanwhile, iron shows high ORR catalytic activity, and an efficient bifunctional catalyst is obtained by adding heteroatom iron into a nickel-based material under a synergistic effect; ferronickel metal is distributed in the nitrogen-doped carbon nanotube, so that metal particle aggregation in a high-temperature synthesis process or decomposition failure under an extreme working condition is effectively prevented; the self-supporting electrode is high in electrochemical activity, good in cycle performance, good in flexibility and portability, stable and excellent in battery performance and excellent in mechanical performance.

The invention relates to the technical field of solar cells, in particular to a perovskite solar cell, a preparation method thereof and a photovoltaic module. The invention aims to solve the problem that the cell performance is influenced by non-uniform coverage of the perovskite layer on the hole transport layer. For the purpose, the preparation method of the perovskite solar cell comprises the steps of preparing a hole transport layer on a substrate, preparing an interface modification layer on the hole transport layer, preparing a perovskite layer on the interface modification layer, and sequentially preparing an electron transport layer and an electrode on the perovskite layer to obtain the perovskite cell, the wettability of the hole transport layer can be improved by introducing 3-hydroxyphenylboronic acid into the adjacent interface of the perovskite layer and the hole transport layer, so that the coverage rate of the perovskite layer is increased, meanwhile, the 3-hydroxyphenylboronic acid is coordinated with metal ions in the perovskite layer, non-radiative recombination between the hole transport layer and the perovskite layer interface can be reduced, and the hole transport efficiency is improved. And the carrier transmission efficiency is improved.

The invention provides a vehicle mode control method and system and a vehicle, and belongs to the technical field of vehicles. According to the embodiment of the invention, the gearbox controller sends the second flag bit to the vehicle control unit, so that the vehicle control unit can comprehensively consider the first flag bit and the second flag bit to determine an appropriate low-speed direct-drive function flag bit, and then the low-speed direct-drive function of the vehicle is achieved through coordination between the gearbox controller and the vehicle control unit. Accurate control over the low-speed direct-drive mode is achieved, and the vehicle can be switched to the low-speed direct-drive mode at a proper time. On the other hand, by developing a low-speed direct-drive mode, the engine can drive the vehicle in a low-speed scene, the problem that the vehicle runs in winter and consumes too fast electricity is effectively solved, the electricity protection capacity of the vehicle is improved, the vehicle can be always kept in a four-wheel-drive state in a low-speed state, the phenomenon that the vehicle slips and drifts in snowy days is effectively avoided, and the service life of the vehicle is prolonged. And the driving safety of the vehicle is ensured.

The invention belongs to the technical field of lithium ion battery positive electrode materials, and provides a high-specific-energy lithium manganese iron phosphate positive electrode material and a preparation method thereof.The preparation method comprises the following steps that 1, carbon nanotubes are added into deionized water to be subjected to ultrasonic dispersion, modified xanthan gum, ammonia water and hydrazine hydrate are added to be stirred, the mixture is heated to continue to be stirred, suction filtration and washing are conducted, and carbon nanotubes are obtained; drying to obtain a carbon source; step 2, adding the lithium hydroxide solution into the phosphoric acid solution, stirring and dispersing, adjusting the pH value, adding the manganese sulfate solution and the ferrous sulfate solution, and carrying out hydrothermal synthesis reaction to obtain a hydrothermal reaction product; step 3, centrifuging, washing and drying the hydrothermal reaction product, and mixing the dried product with a carbon source to obtain a mixture; step 4, carrying out ball milling on the mixture to obtain powder; and step 5, calcining the powder, and cooling to obtain the product. The obtained lithium manganese iron phosphate positive electrode material has the advantages of uniform thickness of a carbon coating layer, excellent electrochemical performance, stable cycle performance and the like.

The invention discloses an application of gossypol or gossypol carboxylate in improving the performance of a perovskite solar cell, and belongs to the technical field of perovskite cells. A gossypol or carboxylic acid gossypol layer is formed between an electron transport layer and a perovskite layer of the perovskite cell, so that the performance of the perovskite solar cell is improved. According to the perovskite solar cell, the gossypol layer is formed between the electron transport layer and the perovskite layer of the perovskite solar cell, so that the cell performance of the perovskite solar cell can be obviously improved; besides, aiming at the characteristic that the aldehyde group in the gossypol is easy to oxidize, the gossypol is converted into carboxylic gossypol to improve the stability of the gossypol, and then the gossypol is used for forming a carboxylic gossypol layer between the electron transport layer and the perovskite layer of the perovskite solar cell, so that the cell performance of the perovskite solar cell can be further improved. The technical scheme provided by the invention widens the application range of gossypol.

The invention relates to a formula of a high-performance sodium-ion battery electrolyte, and aims to improve the cycle life, safety and rate capability of a sodium-ion battery. The electrolyte comprises sodium hexafluorophosphate as a sodium salt, carbonic ester as an organic solvent and a plurality of additives (fluoroethylene carbonate, bis (2, 2, 2-trifluoroethyl) carbonate, ethylene sulfate, 1, 3-allyl sultone and sodium difluoro (oxalato) borate). Through the synergistic effect of the additives, a stable positive electrode / electrolyte interface film (CEI) is formed, cation dissolution is reduced, and the sodium ion transmission performance and the high-voltage stability of the battery are improved. In a half cell assembled with a NaNi0. 4Fe0. 2Mn0. 4O2 positive electrode, when the electrolyte works in a voltage range of 2-4.2 V, the specific discharge capacity of more than 160mA. H / g is provided, and the capacity retention ratio exceeds 80% after 200 cycles at the rate of 1C.

The invention discloses a preparation method and application of a sulfur-doped metal monatomic loaded porous carbon material. Metal ions and sulfonic acid groups are utilized to form stable coordination bonds, the stable coordination bonds are confined in a zeolite imidazole-8 three-dimensional network porous structure, and the sulfur-doped metal monatomic loaded porous carbon material is obtained through pyrolysis. The material is in a dodecahedron shape, the particle size is 100-1000 nm, and the mass percent of metal monatomic is 0.1%-10%. In addition, the electronic structure of the active site of the catalyst is adjusted through sulfur doping, the monatomic adsorption and catalysis capability is improved, polysulfide shuttling is relieved, the electrode conversion reaction kinetics is improved, and the high-performance lithium-sulfur battery is achieved.

The invention relates to a preparation method of a membrane electrode suitable for a low-humidity working condition, which comprises the following steps: (1) dissolving an ionic liquid in ultrapure water, and uniformly dispersing to obtain an ionic liquid aqueous solution; (2) uniformly mixing the ionic liquid aqueous solution obtained in the step (1) with a catalyst, coating the surface of the catalyst with the ionic liquid, and cleaning and drying the coated catalyst to obtain an ionic liquid coated catalyst; (3) uniformly mixing the ionic liquid coated catalyst obtained in the step (2) with an ionomer and a dispersing solvent, preparing catalyst slurry, and spraying to prepare a cathode catalyst layer; and (4) hot-pressing the cathode catalyst layer and the anode catalyst layer obtained in the step (3) to two sides of a proton exchange membrane to prepare the membrane electrode. Compared with the prior art, the membrane electrode disclosed by the invention can ensure high-efficiency transmission of protons in the catalyst layer under a low-humidity working condition, so that wide-working-condition operation is realized; meanwhile, oxygen mass transfer is enhanced, and the battery performance under high current density is improved.

This application discloses an all-solid-state hydrogen negative ion battery, belonging to the field of hydrogen negative ion conductors. It includes a positive electrode containing a hydrogen negative ion donor, a negative electrode capable of storing hydrogen negative ions, and a solid hydrogen negative ion conductor between the positive electrode and the negative electrode; the chemical formula is M 1 α M 2 β O x N y H z ; M 1 is selected from at least one of alkaline earth metal elements Ba, Sr, Ca, Mg; M 2 is selected from at least one of lanthanide metal elements La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu; 0 ≤ α ≤ 6, 0 ≤ β ≤ 4, and α and β are not both 0 at the same time; 0 < x ≤ 6, 0 < y ≤ 4, 0 < z ≤ 12; when M 2 is trivalent, 2α + 3β = 2x + 3y + z; when M 2 is tetravalent, 2α + 4β = 2x + 3y + z.

The invention belongs to the field of electrochemistry, and discloses a nitro functionalized Zn-Mo bimetal organic framework solid electrolyte and a preparation method thereof. The preparation method comprises the following steps: firstly, synthesizing Zn-Mo bimetal organic frameworks MOFs with nitro functional groups through a reflux method, blending the Zn-Mo bimetal organic frameworks MOFs with a lithium salt and a polymer to obtain viscous slurry, pouring the viscous slurry on a glass plate to cure the viscous slurry, standing, and carrying out vacuum drying at 60 DEG C to obtain the nitro functional Zn-Mo bimetal organic framework solid electrolyte. The preparation method is simple and easy to operate, and the electrochemical stability and thermal stability of the battery can be effectively enhanced; the lithium ion transference number of the prepared diaphragm is up to 0.70, the assembled lithium iron phosphate battery is 120 mAh g <-1 > under the rated capacitance of 1C, the capacity retention ratio is close to 95%, and the lithium iron phosphate battery shows good cycling stability and multiplying power.

The present invention relates to an electrode assembly including a positive electrode, a negative electrode, and a coating layer between the positive electrode and the negative electrode, in which the coating layer is formed in two or more layers in a stacking direction of the positive electrode and the negative electrode, in which the coating layer includes a first coating layer in facing contact with the negative electrode and a second coating layer not in facing contact with the negative electrode, the first coating layer contains any one type of particles selected from the following i) to iii), when the first coating layer contains i) or ii), the second coating layer contains iii), and when the first coating layer contains iii), the second coating layer contains i) or ii): i) oxide-based solid electrolyte particles and ceramic particles having an absolute value of zeta potential of 25 mV or more, ii) oxide-based solid electrolyte particles, and iii) ceramic particles having an absolute value of zeta potential of 25 mV or more.

The invention belongs to the technical field of fuel cells, and provides an electrolyte of an SOFC (solid oxide fuel cell) and a preparation method and application of the electrolyte. The preparation method comprises the following steps: mixing the oxide of the electrolyte matrix, the salt of the doping element, the sintering aid and the complexing agent to obtain mixed powder; and drying and calcining the mixed powder to obtain the catalyst. The invention also discloses the electrolyte of the SOFC prepared according to the method and the SOFC. The electrolyte comprises the electrolyte, a cathode, an anode and a connector. The sintering aid is added when the electrolyte of the SOFC is prepared, the mixed ceramic powder can be prepared through a one-step method, and the densification temperature of the electrolyte is reduced, so that the density of an electrolyte layer can be improved, and the battery performance of the SOFC can be further improved. The preparation process is simple, and electrolyte powder does not need to be prepared firstly and then a sintering aid does not need to be added.

The invention provides a nitrogen-sulfur double-doped carbon coating repairing method and application of a waste lithium iron phosphate material, and the nitrogen-sulfur double-doped carbon coating repairing method comprises the following steps: soaking a complete waste lithium iron phosphate positive pole piece in hot water until waste lithium iron phosphate positive pole piece scraps and aluminum foil in the waste lithium iron phosphate positive pole piece are separated; the method comprises the following steps: putting collected waste lithium iron phosphate positive pole piece chips into ultrasonic equipment for ultrasonic cleaning, and then respectively drying, crushing and sieving to obtain waste lithium iron phosphate positive pole material powder; supplementing a lithium source, a nitrogen-sulfur double-doped carbon source and a dispersing agent into the obtained waste lithium iron phosphate positive electrode material powder, and heating to obtain a mixture; respectively centrifugally washing the mixture with deionized water and ethanol, and then carrying out vacuum drying to obtain a repaired lithium iron phosphate precursor; and carrying out heat treatment on the repaired lithium iron phosphate precursor obtained in the step 4 in inert gas, and cooling to obtain the repaired lithium iron phosphate material. And the overall electrochemical performance can be improved, so that the repaired and regenerated lithium iron phosphate has good battery performance.

The invention relates to the technical field of vehicle control, and provides a vehicle control method and device and a vehicle. The method comprises the following steps: acquiring a current running mode of a vehicle; determining a torque distribution coefficient to be selected based on the current actual battery electric quantity of the vehicle in response to the determination that the current operation mode is a direct drive mode or a series-parallel mode; the current torque distribution coefficient at the current moment is determined, and the target torque distribution coefficient with the minimum energy consumption is determined from the torque distribution coefficients to be selected and the current torque distribution coefficient according to the driving mode of the vehicle; and distributing the current torque request according to the target torque distribution coefficient. Therefore, the current torque request can be distributed according to the target torque distribution coefficient with the minimum energy consumption, so that the power consumption of the vehicle is reduced, and the power protection capability of the vehicle can be improved when the electric quantity of the vehicle battery is low.

The invention provides a method for preparing a high-efficiency copper indium gallium sulfur selenium solar cell based on antimony doping by a solution method. The method comprises the following steps: preparing precursor solutions with different antimony doping concentrations; performing spin-coating annealing on the precursor solution for multiple times to obtain a precursor film; through selenylation, a micron-sized CIGS absorption layer penetrating through crystal grains up and down is obtained; and depositing a buffer layer, a window layer and a top electrode to prepare the antimony-doped CIGS thin film solar cell. According to the method for preparing the efficient copper-indium-gallium-sulfur-selenium solar cell by doping antimony based on the solution method, the metal antimony salts with different concentrations are added into the precursor solution, so that the micron-sized penetrating high-quality absorption layer is prepared, and the corresponding cell performance of the solar cell prepared based on the method is obviously improved.

The invention provides a preparation method of an oxygen-etched Fe-N-C cathode oxygen reduction catalyst, which comprises the following steps: in a protective atmosphere, performing first pyrolysis on ZIF-8 to obtain a nitrogen-carbon substrate with a regular dodecahedron frame structure; the method comprises the following steps: dispersing a nitrogen-carbon substrate, superoxide and crown ether in a solvent to obtain a turbid liquid, releasing superoxide ions in the turbid liquid, forming a carbon-oxygen double bond defect by the superoxide ions and carbon atoms in the nitrogen-carbon substrate, and centrifuging the turbid liquid to obtain a composite solid; and grinding and mixing the composite solid and iron salt, performing secondary pyrolysis in a protective atmosphere, and performing acid pickling and drying to obtain the oxygen-etched Fe-N-C cathode oxygen reduction catalyst. The invention further provides the Fe-N-C cathode oxygen reduction catalyst obtained through the preparation method and application of the Fe-N-C cathode oxygen reduction catalyst.

The embodiment of the present application relates to the field of battery technology and provides a method for preparing a lithium-ion battery, comprising: winding or laminating a positive electrode sheet, a negative electrode sheet and a separator and then placing them into a shell to form an initial battery cell; in a first liquid injection process, injecting a first electrolyte into the initial battery cell, the components of the first electrolyte including: 0.5wt%~2wt% of vinylene carbonate, 5wt%~15wt% of lithium salt and a non-aqueous organic solvent; performing a formation process on the initial battery cell; in a second liquid injection process, injecting a second electrolyte into the initial battery cell, the components of the second electrolyte including: 5wt%~20wt% of vinylene carbonate, 5wt%~15wt% of lithium salt, 0.005wt%~30wt% of a wetting stabilizer and a non-aqueous organic solvent; wherein, the first electrolyte or the second electrolyte further includes: at least one of 1,3-propane sultone or fluoroethylene carbonate, which is at least conducive to maintaining the lithium-ion battery with high energy efficiency and long cycle life under the condition of low liquid injection amount.

The utility model relates to the technical field of lithium battery production, in particular to a pole piece positioning mechanism and a pole piece laminating device. The pole piece positioning mechanism comprises a positioning part, the positioning part comprises a bearing end wall, a first side peripheral wall and a second side peripheral wall, the bearing end wall is provided with a bearing end face used for bearing a pole piece, the vertical height of the bearing end face is gradually reduced in the first horizontal direction to form a first higher side and a first lower side, and the vertical height of the bearing end face is gradually reduced in the second horizontal direction perpendicular to the first horizontal direction to form a second lower side. The vertical height of the bearing end face is gradually reduced to form a second higher side and a second lower side, the first side peripheral wall is connected to the bearing end wall and arranged on the first lower side, and the second side peripheral wall is connected to the bearing end wall and arranged on the second lower side. The pole piece lamination device comprises the pole piece positioning mechanism. The pole piece positioning mechanism and the pole piece lamination device provided by the utility model are simple in overall structure, high in pole piece positioning efficiency and easy to control in pole piece positioning precision.

Provided is a binder for nonaqueous electrolyte secondary battery electrodes, which is capable of suppressing the degree of swelling of an electrode. A crosslinked polymer containing a carboxyl group or a salt thereof is used as the binder for nonaqueous electrolyte secondary battery electrodes. The cross-linked polymer or a salt thereof has a particle diameter measured in an acetonitrile medium of 0.60-1.0 [mu] m in terms of volume-based median diameter, and a water swelling degree at pH 8 of 25-40.

The utility model discloses a double-layer coating die head, which relates to the technical field of lithium battery manufacturing and comprises an upper die head, a middle die head, a lower die head, a first gasket and a second gasket, the middle die head is arranged between the upper die head and the lower die head, the first gasket is arranged between the upper die head and the middle die head, the second gasket is arranged between the middle die head and the lower die head, a plurality of first discharging notches are formed in the first gasket side by side, a plurality of second discharging notches are formed in the second gasket side by side, and the first discharging notches and the second discharging notches are arranged in a staggered mode. The upper die head is provided with a first groove, the first groove is attached to the first gasket to form a first extrusion cavity, the first extrusion cavity is communicated with the first discharging notch, the lower die head is provided with a second groove, and the second groove is attached to the second gasket to form a second extrusion cavity; the coating device has the beneficial effects that a pole piece with a reserved space can be directly coated, secondary processing is not needed, the waste of coating is reduced, and the production efficiency is improved.

The invention relates to an efficient electrode pole piece manufacturing method which can efficiently remove crystal water in a battery pole piece and improve the production efficiency and the battery performance. Comprising the following steps: forming a through hole in a metal foil, uniformly coating the surface of the metal foil with slurry, automatically rolling the coated metal foil into a pole piece roll core, placing the pole piece roll core in a vacuum oven, and heating and baking in a negative pressure environment to remove crystal water and cure an electrode material. The metal foil can be designed into a multi-layer stacked structure, a through hole is formed in each metal sub-layer, and the centers of the through holes in the adjacent layers are not overlapped, so that the binding force of the electrode material can be improved while the discharge efficiency of crystal water is enhanced. The method is particularly suitable for being applied to sodium battery positive electrode materials such as Prussian blue and white systems, and the dehydration effect and the production efficiency are both improved. The electrode plate provided by the invention has lower water content after baking, higher drying efficiency and better cycle attenuation performance and energy density.

A negative electrode for a rechargeable lithium battery and a rechargeable lithium battery including the same are provided. The negative electrode includes: a negative electrode current collector including a carbon layer and a silicon layer, the carbon layer including a first porous substrate and a carbon-based material present inside the first porous substrate, and the silicon layer including a second porous substrate and a silicon-based negative electrode active material present inside the second porous substrate; and a negative electrode active material layer disposed on a surface of the negative electrode current collector and including a negative electrode active material.

The invention provides a high-performance samarium cerium oxide electrolyte material and a preparation method thereof, and the preparation method comprises the following steps: S1, dissolving Sm (NO3) 3.6 H2O and Ce (NO3) 3.6 H2O in deionized water, then adding a dispersant, and uniformly mixing to obtain a mixed solution A; s2, dissolving a precipitator in deionized water, and uniformly mixing to obtain a mixed solution B; s3, dropwise adding the mixed solution A obtained in the step S1 into the mixed solution B under a stirring condition, continuing to stir for 2-4 hours after dropwise adding, stopping stirring, and continuing to age for 4-24 hours to obtain a reactant; s4, centrifuging the reactant obtained in the step S3 to obtain a precipitate I, washing the precipitate I with absolute ethyl alcohol and deionized water, and centrifuging for three times to obtain a precipitate II; and S5, drying the precipitate II obtained in the step S4, and performing high-temperature calcination to obtain the high-performance samarium cerium oxide electrolyte material. The prepared high-performance samarium cerium oxide electrolyte material has high conductivity and sintering activity, and can be used for preparing high-performance medium and low temperature solid oxide fuel cells.

The present invention discloses a preparation method and preparation equipment of a dry electrode film. The preparation method of the dry electrode film comprises providing a pair of first rollers with a roller diameter of d1, setting the pressure of the first rollers to t1, rolling the fibrous powder by the pair of first rollers to obtain an initial film of initial thickness; providing a pair of second rollers with a roller diameter of d2, and d2<d1, setting the pressure of the second rollers to t2, and t2<t1, and performing primary thinning on the initial film by the pair of second rollers to obtain a secondary film of secondary thickness; providing at least a pair of third rollers with a roller diameter of d3, and d3>d1, setting the pressure of the third rollers to t3, and t3>t1, and performing secondary thinning on the secondary film by the third roller to obtain a target film of target thickness. The target film prepared in this embodiment has better strength and more suitable toughness characteristics.

The present disclosure belongs to the field of battery technologies, and specifically relates to a battery. The battery includes a positive electrode plate, a negative electrode plate, a non-aqueous electrolyte solution, and a separator. The non-aqueous electrolyte solution includes a non-aqueous organic solvent, a lithium salt, and an optional electrolyte additive. A termination tape of the positive electrode plate is disposed at a paste coating tail of the positive electrode plate. An area of a termination tape of the positive electrode plate is A cm2, and a width of the positive electrode plate is C cm, wherein a ratio of A to C is in a range of 1 to 3. The battery can effectively improve high-temperature performance of a battery cell of the prepared battery, and can also solve a problem of lithium deposition at an edge of an electrode plate occurred after cycling of the battery cell, to avoid problems, such as thickness failure in high-temperature storage and lithium deposition in high-temperature cycling of the battery cell caused by warping and deformation of a termination tape of a positive electrode plate, an adhesive layer in the termination tape of the positive electrode plate being easily soluble in a non-aqueous electrolyte solution, and the non-aqueous electrolyte solution being easily oxidized, reduced and decomposed at positive and negative interfaces, occurred when the battery is used in a high-temperature environment.

A battery pack and an electric vehicle are provided. The battery pack includes a tray and a heating component. The heating component is arranged within the tray, and the heating component includes multiple heating sections. In the heating component of the battery pack, heating powers of the multiple heating sections are different, and the multiple heating sections are respectively configured to heat multiple regions within the tray to balance an ambient temperature within the tray.

The present invention provides a secondary battery electrode binder that exhibits superior binding capacity as compared to conventional binders and that makes it possible to reduce slurry viscosity, even when the solid concentration of an electrode slurry is high. A secondary battery electrode binder according to the present invention contains a block polymer having a polymer block (A) and a polymer block (B), wherein: the polymer block (A) includes a structural unit derived from an ethylenically unsaturated carboxylic acid monomer; the content of a structural unit derived from an ethylenically unsaturated carboxylic acid monomer in the polymer block (B) is less than 30 mass% (and is different from that in the polymer block (A)) with respect to all the structural units of the polymer block (B); the ratio of the polymer block (A) in the block polymer is 10-90 mass%; and the block polymer does not contain a structural unit derived from a crosslinkable monomer.

The invention relates to the technical field of lithium ion battery material preparation, and discloses a core-shell structure composite electrolyte and a preparation method and application thereof. The method comprises the following steps: (1) carrying out ultrasonic treatment on a mixed solution containing a polyphenol solution and an organic amine solution and a titanium-aluminum-lithium phosphate electrolyte to obtain a modified titanium-aluminum-lithium phosphate electrolyte; performing emulsion liquefaction reaction on an acrylate monomer, a first emulsifier and a first initiator to obtain a pre-emulsion; and (2) in the presence of a second emulsifier, a second initiator and a buffer agent, dropwise adding the pre-emulsion to the modified lithium titanium aluminum phosphate electrolyte under a temperature programming condition, and carrying out a polymerization reaction to obtain the core-shell structure composite electrolyte. The core-shell structure composite electrolyte prepared by the preparation method of the core-shell structure composite electrolyte provided by the invention can synergistically solve the interface problem of an LATP solid electrolyte and the problem of low liquid absorption rate of a polymer electrolyte, and the cell performance is obviously improved.

The invention relates to the field of sodium-ion battery positive electrode materials, in particular to a sodium-ion battery layered oxide positive electrode material and a preparation method thereof, and aims to solve the problem that the battery performance is remarkably reduced due to the fact that an existing sodium-ion battery layered oxide positive electrode material is prone to phase change and cracks in the circulation process. The layered oxide positive electrode material of the sodium-ion battery is composed of a composite layered oxide and a polycarbazole protective layer, the composite layered oxide is composed of more than two metal ions, the electrochemical performance is excellent, after polycarbazole is wrapped as the protective layer, direct contact between the composite layered oxide and electrolyte can be effectively isolated, and the service life of the sodium-ion battery is prolonged. According to the present invention, the polycarbazole can be used as the positive electrode material, the volume change caused by the non-uniform intercalation and deintercalation of sodium ions during the charge-discharge process can be inhibited, and the fluorine atoms in the polycarbazole protection layer can provide the excellent high-temperature stability and the excellent chemical stability, such that the protection effect is good, and the cycle stability of the positive electrode material is further improved.