831results about How to "Lower impedance" patented technology

The invention provides a negative electrode material, a preparation method thereof and a battery. The negative electrode material comprises graphite and a carbon layer located on at least part of the surface of the graphite; the particle surface and the particle tangent plane of the negative electrode material are respectively tested by adopting a Raman spectrum, the ratio of the peak area of a characteristic peak D in the range of 1300 cm <-1 > to 1350 cm <-1 > to the peak area of a characteristic peak G in the range of 1500 cm <-1 > to 1580 cm <-1 > is ID / IG, the ID / IG ratio of the particle surface of the negative electrode material is A, the ID / IG ratio of the particle tangent plane of the negative electrode material is B, and 1.22 < A-B < = 2.10. The particle surface of the negative electrode material is tested through an atomic force microscope, a # imgabs0 # test area is randomly selected on the particle surface of the negative electrode material, the arithmetic mean value of the absolute value of the height deviation relative to the reference surface in the test area is S nm, and S is larger than or equal to 15 nm and smaller than or equal to 60 nm. The negative electrode material provided by the invention can comprehensively improve lithium ion transmission kinetics, first coulombic efficiency and cycle performance.

In order to solve the problem that an existing high-voltage lithium ion battery is insufficient in high-temperature performance and safety performance, the invention provides a cyclic carbonate-sulfate compound and application thereof, a non-aqueous electrolyte and a secondary battery, and the cyclic carbonate-sulfate compound comprises a compound as shown in a chemical formula 1, the specific rotation [alpha] of the cyclic carbonate-sulfate compound ranges from-7.982 degrees mL / (dmg) to + 7.982 degrees mL / (dmg), and the specific rotation [alpha] of the cyclic carbonate-sulfate compound ranges from-7.982 degrees mL / (dmg) to + 7.982 degrees mL / (dmg); the chemical formula 1 of the # imgabs0 # is shown in the specification. When the cyclic carbonate-sulfate compound provided by the invention is used as an electrolyte additive, a formed solid electrolyte membrane is smoother and more ordered, so that the cyclic carbonate-sulfate compound has higher high-temperature stability, especially membrane layer stability under a thermal shock condition.

The invention discloses an ultra-wideband low-profile dual-polarization curved surface phased-array antenna, and belongs to the field of antenna engineering technology and wireless communication. The phased-array antenna comprises a plurality of pitching surface sub-arrays which are arranged along the axial direction; the pitching surface subarray is composed of a plurality of curved surface antenna units which are uniformly distributed along the circumference, and the whole pitching surface subarray is fan-shaped; the curved antenna unit comprises a curved dielectric block, a metasurface matching layer, a radiator layer, a vertical feed balun, a wave-absorbing resistance layer and a metal floor layer, wherein the metasurface matching layer and the radiator layer are conformally arranged on the upper surface and the lower surface of the curved dielectric block. According to the antenna, the flexible dielectric plate is used as a carrier of a radiation dipole and is matched with the PCB metal floor, so that the normal active standing-wave ratio of the antenna is smaller than 3.0 in ten octaves in two linear polarization directions of horizontal polarization and vertical polarization, and + / -60-degree scanning is realized in an azimuth plane.

The invention provides a secondary battery and a preparation method and device thereof, and the secondary battery comprises a positive pole piece, a negative pole piece, a solid electrolyte, a first modification layer and a second modification layer. One of the first modification layer and the second modification layer is located between the positive pole piece and the solid electrolyte, and the other one of the first modification layer and the second modification layer is located between the negative pole piece and the solid electrolyte; the first modification layer and / or the second modification layer comprises 20 wt%-60 wt% of polymer, 10 wt%-65 wt% of lithium salt and 2 wt%-45 wt% of inorganic particles. The thickness of the first modification layer and / or the second modification layer is relatively thin, easy to control and relatively good in uniformity, so that the interface resistance between the positive pole piece and / or the negative pole piece in the secondary battery and the solid electrolyte is remarkably reduced, the side reaction between the solid electrolyte and the positive pole piece and / or the negative pole piece is avoided, and the service life of the secondary battery is prolonged. And the first modification layer and / or the second modification layer have / has good thermal stability, so that the cycle performance of the secondary battery can be improved.

The invention discloses an electroencephalogram sensing electrode and a using method thereof.The electroencephalogram sensing electrode comprises a shell assembly, the shell assembly comprises a shell, a base and a top cover, the shell and the base are connected to form a slow-release probe containing cavity, the shell and the top cover are connected to form a liquid storage cavity, and a fluid valve, a slow-release material, a capillary hole plug, a rapid flow hole and a slow flow hole are arranged in the shell assembly; a semi-dry electrode is made by injecting conductive liquid or a wet electrode is made by injecting conductive paste, and through a fluid valve, a slow-release material, a capillary hole plug, a quick flow hole and a slow flow hole, the electrode can quickly supply liquid to the position between the electrode and the scalp to reduce resistance and slowly supply liquid to reduce resistance, and the electrode-scalp interface impedance can be quickly reduced and can be balanced and stabilized for a long time. The electrode has the advantages that the electrode can be used as a semi-dry electrode by injecting conductive liquid, can also be used as a wet electrode by injecting conductive paste, and has the functions of storing the conductive liquid for a long time without releasing the conductive liquid when the electrode is idle and supplying the conductive liquid in two modes of fast and slow to reduce scalp-electrode impedance when a user wears the electrode to acquire signals.

The invention relates to the technical field of lithium ion battery materials, and provides a lithium iron phosphate positive electrode material, a preparation method thereof and a lithium battery. The preparation method of the lithium iron phosphate positive electrode material comprises the following steps: performing a first coprecipitation reaction on a first iron source solution and a first phosphorus source solution in the presence of a polymer monomer to obtain an iron phosphate seed crystal; performing a second coprecipitation reaction on the second iron source solution and the second phosphorus source solution in the presence of a polymer monomer and an iron phosphate seed crystal to obtain iron phosphate dihydrate; iron phosphate dihydrate, a lithium source and a carbon source are mixed and then subjected to spray drying, the mixture is placed in a rotary kiln to be sintered, carbon-coated lithium iron phosphate with the large particle size and carbon-coated lithium iron phosphate with the small particle size are prepared at different sintering temperatures respectively, and the carbon-coated lithium iron phosphate with the different particle sizes are mixed according to the mass ratio to obtain the lithium iron phosphate positive electrode material. The lithium iron phosphate positive electrode material has relatively good spherical morphology, so that the lithium iron phosphate positive electrode material has relatively high compaction density and electrical properties after grading.

The invention belongs to the technical field of lithium ion batteries, and relates to an electrolyte of a lithium ion battery for a high-nickel ternary positive electrode material and application of the electrolyte, and the electrolyte comprises an organic solvent, a lithium salt and an additive, the additive is prepared from (5-cyanopyridine-3-yl) potassium trifluoroborate. The lithium ion battery electrolyte can form low-impedance interfacial films on the surfaces of a positive electrode and a negative electrode at the same time, interface stability is improved, and better cycling stability and longer service life can be obtained when the lithium ion battery electrolyte is applied to a lithium ion battery.

The invention discloses a modified lithium borohydride solid electrolyte and a preparation method thereof, and belongs to the field of all-solid-state battery electrolyte preparation, the method comprises the following steps: mixing LiBH4 and lithium halide according to a formula ratio, and carrying out ball milling and heating to obtain an xLiBH4-LiX (x = 1-5) solid solution; then mixing and ball-milling B2O3 and the LiBH4-lithium halide solid solution to obtain a doped and composite synergistically modified (xLiBH4-LiX) y-B2O3 (y is equal to 10 to 20) solid electrolyte; a LiBH4 phase is stabilized by doping lithium halide, and grain gaps are densified by compounding B2O3, so that the grain boundary impedance is reduced, the lithium dendrite inhibition capability of the lithium borohydride-based solid electrolyte is improved, the stable operation of the lithium borohydride-based solid electrolyte at high voltage is ensured, and the lithium borohydride-based solid electrolyte has relatively high ionic conductivity, relatively low electronic conductivity and a relatively wide electrochemical window; and the lithium borohydride-based solid electrolyte has good stability and compatibility with a lithium metal negative electrode, and development of the lithium borohydride-based solid electrolyte in commercial application of a lithium ion battery is facilitated.

The invention provides a lithium-mixed coated modified ternary positive electrode material as well as a preparation method and application thereof, and relates to the technical field of lithium battery raw materials. Various lithium sources are mixed according to a certain proportion to prepare a ternary positive electrode, co-doping modification is carried out through cooperation of Li3PO4 and a W / Al / Zr / Y / B-containing compound, double-layer coating modification is carried out through cooperation of the Li3PO4 and a Ti / Al-containing compound for primary coating and cooperation of an anhydrous Li compound and TiP2O7 or Ti3 (PO4) 4 for secondary coating, and a double-gradient fast ion conductor coating layer is constructed. The structural stability, the thermal stability, the first discharge capacity and efficiency, the multiplying power, the circulation and storage performance and the like of the single-crystal or polycrystal ternary positive electrode material under different voltage and power conditions are improved; the lithium-mixed multi-element composite ternary positive electrode provided by the invention has the advantages of more stable layered structure, higher safety, higher electronic conductivity, better multiplying power, high specific capacity and long cycle performance.

The invention provides an electrolyte composition, a secondary liquid injection method and a battery. The electrolyte composition suitable for secondary liquid injection comprises a first electrolyte for primary liquid injection and a second electrolyte for secondary liquid injection, the first electrolyte comprises 0.01 to 5 weight percent of vinylene carbonate, 0.05 to 3 weight percent of a first additive, 0.01 to 5 weight percent of a second additive, 5 to 15 weight percent of lithium salt, 0.01 to 5 weight percent of a film-forming additive and the balance of a non-aqueous organic solvent; the second electrolyte comprises 5 to 30 weight percent of vinylene carbonate, 0.01 to 10 weight percent of first additive, 5 to 15 weight percent of lithium salt and the balance of non-aqueous organic solvent; wherein the first additive comprises a compound as shown in a formula 1; the second additive comprises a compound as shown in a formula 2. The electrolyte composition provided by the invention can enable the battery to present low gas yield, low initial DCR and normal-temperature and high-temperature cycle performance.

The invention relates to the technical field of lithium batteries, and provides a lithium ion secondary battery. The battery comprises a positive plate, a diaphragm and a negative plate which are laminated, the positive plate comprises lithium iron phosphate; the diaphragm is formed by a base film; the battery also comprises an electrolyte; the electrolyte comprises lithium bis (fluorosulfonyl) imide and lithium hexafluorophosphate; based on the total mass of the electrolyte, the mass ratio of the lithium bis (fluorosulfonyl) imide is recorded as L2, and the mass ratio of the lithium hexafluorophosphate is recorded as L1; l2 and L1 satisfy the following conditions: 0.1 < = L2 / L1 < = 4.6; the electrolyte comprises a linear organic solvent and an annular organic solvent; the linear organic solvent comprises linear carbonic ester and linear carboxylic ester, and the cyclic organic solvent comprises cyclic carbonic ester; the mass ratio of the linear organic solvent to the annular organic solvent is marked as W, and W is greater than or equal to 1; when the conditions are met, the high and low temperature performance and the safety performance of the battery can be effectively improved.

The invention provides a graphite negative electrode material for a lithium battery and a preparation method of the graphite negative electrode material. The preparation method comprises the following steps: (1) preparing modified phenolic resin; (2) adding natural graphite and the modified phenolic resin into a reaction kettle, continuously adding the modified graphene, and stirring, heating and coating in a nitrogen atmosphere, specifically, heating to 150-200 DEG C at a speed of 1-2 DEG C / min, preserving heat for 100-120 minutes, heating to 550-600 DEG C at a speed of 4-6 DEG C / min, preserving heat for 180-200 minutes, and cooling to obtain coated graphite; and (3) carbonizing the coated graphite in an atmosphere furnace, and sieving to obtain the graphite negative electrode material for the lithium battery. When the negative electrode material is used for preparing a lithium battery, the capacity retention ratio is high, the rate capability is good, the impedance is low, and the lithium precipitation point of fast charge is high.

The invention provides a method for cyclically regenerating a positive electrode active material by using magnesium sulfate, which comprises the following steps: 1) burdening and mixing waste lithium battery black powder, magnesium sulfate and a carbon source, and roasting the mixture in a vacuum or inert atmosphere to obtain a roasted product; (2) adding the roasted product into water to carry out water leaching treatment, and carrying out suction filtration to obtain a lithium sulfate solution and water leaching residues; 3) adding the lithium sulfate solution into the saturated sodium carbonate solution for lithium precipitation to obtain a lithium carbonate precipitate; (4) drying the water leaching residues, adding dilute sulphuric acid to carry out acid leaching treatment, filtering to obtain acid leaching residues and a magnesium sulfate solution, and then carrying out evaporative crystallization treatment on the magnesium sulfate solution to obtain a magnesium sulfate precipitate; 5) mixing the acid leaching residues with lithium carbonate, and sintering to obtain the regenerated ternary positive electrode active material.According to the method, the recovery rate of obtained lithium reaches 99% or above, loss of important elements in the regeneration process can be avoided, cyclic utilization of magnesium sulfate is achieved, and consumption of chemical reagents and secondary pollution are reduced.

The invention provides a secondary battery electrolyte additive and a preparation method thereof. The additive is obtained by bonding oxygen atoms of four hydroxyl groups on R1-R5 groups in a compound as shown in a structural formula I with a group A and a group B through any one of the following modes: (1) bonding with two groups A; (2) bonding with two B groups; (3) bonding with one A group and one B group: # imgabs0 # wherein n is 0 or 1; r1 to R5 are independently selected from H, alkoxy of C1 to C5, hydroxyl and alkyl of C1 to C5 substituted by hydroxyl, and at least four hydroxyl are contained in R1 to R5; * represents a bonding position. The additive can form a stable, cross-linked and tough SEI film, and battery impedance is further reduced. The additive is cheap and easily available in preparation raw materials, low in cost, short in reaction route, simple in purification process, high in production efficiency and wide in application prospect in the secondary battery electrolyte.

The invention discloses electrolyte for a long-service-life sodium-ion battery as well as a preparation method and application of the electrolyte, and relates to the technical field of sodium-ion battery electrolyte. According to the invention, the piperidinyl and phosphorous acid tetrafluoroborate ionic liquid is added, so that the performance of the sodium ion electrolyte is remarkably improved. Firstly, the additives improve the thermal stability and chemical stability of the electrolyte, which are particularly important in the long-term operation process of the battery, and can effectively prevent the electrolyte from being decomposed under high-temperature or extreme operating conditions. And secondly, because the ionic liquid has excellent electrochemical stability, the electrochemical window of the electrolyte is enhanced due to the existence of the ionic liquid, that is, the electrolyte can bear a wider voltage range without electrochemical reaction. This is very advantageous for improving the energy density and power output of the battery. And finally, the introduction of the ionic liquid can also increase the ionic conductivity of the electrolyte and reduce the internal impedance of the battery, so that the charge-discharge efficiency and the cycle life of the battery are improved.

The invention relates to a non-aqueous electrolyte and a lithium secondary battery. In order to solve the problems of poor cycle performance, high impedance and serious gas production of a lithium secondary battery, the invention provides a non-aqueous electrolyte, the non-aqueous electrolyte comprises an organic solvent, a lithium salt and additives, the additives comprise a first additive, a second additive and a third additive, the first additive is selected from one or more of compounds shown in a formula I, and the third additive is selected from one or more of compounds shown in a formula II; the formula I is # imgabs0; the second additive is selected from a compound shown in a formula II and / or a formula III; the formula II is # imgabs 1 #, the formula III is # imgabs 2 #, and the third additive is selected from one or more of double-bond-containing cyclic carbonate, halogen-containing cyclic carbonate, sulfonate, sulfate, sulfite, anhydride, a benzene compound, a fluorobenzene compound, a nitrile compound, phosphate, phosphite, a boron compound, an amine compound, a silicon-containing compound and a heterocyclic compound. Through the synergistic effect of the three additives, the cycle performance of the battery is improved, the impedance of the battery is reduced, and the gas production of the battery is reduced.

The embodiment of the invention provides a display panel and a display device. The display panel comprises a display area and a first non-display area located on one side of the display area in the first direction, and the first non-display area comprises a substrate and a first power source structure; the first power supply structure comprises a first branch part and a second branch part, the first branch part and the second branch part are in different layers and are electrically connected, and the second branch part comprises a first sub-part and a second sub-part which are electrically connected with each other; the first sub-part and the first branch part are overlapped in the direction perpendicular to the plane where the substrate is located; in the first direction, the second sub-part is located on the side, away from the display area, of the first sub-part, the length of the second sub-part in the second direction is larger than that of the first sub-part in the second direction, and the second direction intersects with the first direction. The impedance of the first power supply structure can be reduced, and the brightness uniformity of the display area is improved.

The invention provides a negative pole piece, a preparation method thereof and a battery, the negative pole piece comprises a negative current collector and a negative active material layer, and the negative active material layer comprises a negative active material, a conductive agent and a binder; the negative pole piece meets the following relational expressions: 0.1 < = SV / SL < = 1.0, R / W < = 10%, 0.1% < = R < = 0.5%, 1.0% < = W < = 5.0%; wherein SL is the area of the active particles corresponding to the included angle theta between the orientation of the negative electrode active material and the negative electrode current collector being less than 45 degrees, and Sv is the area of the active particles corresponding to theta being greater than or equal to 45 degrees; r is the range of the distributed mass percentage content of the binder; w0 is the total mass percentage content of the binder; the distribution range R of the binder and the orientation SV / SL of the active particles are controlled through the novel manufacturing process, the phenomenon that the binder is not uniformly distributed in the solvent evaporation process can be reduced, the orientation degree of the active substance particles on the pole piece in the rolling process can be reduced, the battery impedance is reduced, and the battery performance is improved. The electrochemical performance of the battery is improved.

The invention discloses a preparation process of a highly graphitized fuel cell microporous layer with a graded pore structure and gradient wetting performance. The preparation method comprises the following steps: firstly, uniformly dispersing carbon black particles in a polyvinylpyrrolidone ethanol solution to prepare a homogeneous viscous spinning solution; then preparing a fiber membrane with a hierarchical pore structure on a plane structure through an electrostatic spinning process, and constructing an excellent water and gas transmission channel; partially entangled fibers are formed in the thickness direction; after drying, stabilization and pre-oxidation are carried out under carbon paper clamping and loading, and fibers are uniformly shrunk and refined; inducing the pre-oxidized fiber membrane to generate highly graphitized transformation under the clamping of a high-purity graphite flake; the preparation method comprises the following steps: taking polytetrafluoroethylene as a raw material, soaking the polytetrafluoroethylene in polytetrafluoroethylene turbid liquid under horizontal placement, drying and melting to enable the polytetrafluoroethylene to be distributed in a gradient manner in the vertical direction, so that good water and gas management performance under a full-humidity working condition (0-100% relative humidity) is realized; and the overall performance of the fuel cell is obviously improved.

The invention relates to a water-based binder and a preparation method and application thereof, the water-based binder comprises modified polyvinyl alcohol, the modified polyvinyl alcohol has repetitive units shown as a formula (1) and a formula (2), # imgabs0 #, R1 is selected from one or more of-Ph and-Ph-(R3) n1, each R3 is the same or different, and n is a positive integer. The two groups are independently selected from one or more of halogen atoms and C1-C3 halogenated alkyl, and n1 is any integer between 1 and 5. The modified polyvinyl alcohol water-based binder disclosed by the invention has good dispersion performance on an electrode material and a conductive agent, keeps good compatibility with an electrolyte, and has the advantages of excellent cohesiveness and environment friendliness, so that the lithium ion battery further has excellent cycling stability and high rate performance, and the lithium ion battery has a wide application prospect. Therefore, the service life of the lithium battery is prolonged.

The invention relates to a modified binder as well as a preparation method and application thereof. The modified binder comprises an inner core layer, a middle shell layer and an outer shell layer which are sequentially arranged from inside to outside, wherein the inner core layer and the middle shell layer are made of butadiene styrene rubber, and the strength of the inner core layer is greater than that of the middle shell layer; and the shell layer is formed by unsaturated acid and unsaturated ether substances. According to the scheme provided by the invention, the problems of negative electrode coating cracking and material floating in the coating process can be effectively improved, the stripping force of the negative electrode piece is improved, and the adhesive property is good; and the dispersion of the negative active material, the conductive agent and the like can be improved and promoted, the loading capacity of the negative active material is improved, and the energy density and cycle performance of the battery are improved.

The invention discloses a lithium iron phosphate positive electrode material with high-rate cycle performance, and belongs to the technical field of lithium batteries, the lithium iron phosphate positive electrode material provided by the invention comprises a lithium iron phosphate core body and a reduced graphene oxide / carbon coating layer, the reduced graphene oxide / carbon coating layer combines chitosan, citric acid and graphene oxide as a carbon source, and the carbon source is a carbon source. And forming gel with a cross-linked network structure under the action of glutaraldehyde, and calcining in a reducing atmosphere to obtain a coating layer. According to the lithium iron phosphate positive electrode material prepared by a sol-gel method, the coating is uniform, complete and compact by utilizing the synergistic effect of the chitosan, the citric acid and the graphene oxide, a continuous electron migration channel can be provided, the impedance of the positive electrode material is reduced during high-rate circulation, and the electrochemical performance of the positive electrode material is improved.

The invention is suitable for the technical field of OER catalysts, and provides a preparation method of a nanowire array composed of a ferrocobalt-based heterostructure, and the preparation method comprises the following steps: pretreating a foamed nickel substrate; performing in-situ growth of a precursor CoFe-LDH nanosheet on the NF through a hydrothermal method; and synthesizing the nanowire array composed of the ferrocobalt-based heterostructure: putting a precursor into a muffle furnace, heating, keeping the temperature so that the precursor is thoroughly converted into a Co-Fe-O intermediate, immersing NF on which the intermediate grows into a polytetrafluoroethylene reaction kettle lining, carrying out a hydrothermal reaction, and naturally cooling to the room temperature to obtain a Co9S8-Fe3O4 / VNF composite material (the vulcanized NF is abbreviated as VNF), so that the nanowire array composed of the ferrocobalt-based heterostructure and the Co9S8-Fe3O4 / VNF composite material is obtained. The nanowire array is composed of a ferrocobalt-based heterostructure. The invention further provides a nanowire array composed of the ferrocobalt-based heterostructure and application of the nanowire array in preparation of a working electrode of an oxygen evolution reaction catalyst. According to the heterostructure catalyst provided by the invention, the adsorption strength of an OER intermediate can be optimized to realize high intrinsic OER activity, and efficient and stable water decomposition is realized.

The invention discloses a carrier board with high integration level, which comprises at least two prefabricated printed circuit board laminations and at least one hollow area, the printed circuit board laminations are fixedly connected through an insulated bonding dielectric layer, and the hollow area is provided with at least one power supply circuit assembly. On the other hand, the invention discloses a high-integration-level transformer unit and a high-integration-level two-stage framework power supply device. The high-integration-level two-stage framework power supply device comprises an annular magnetic core and a winding, wherein the annular magnetic core is embedded in a carrier plate, and the winding is arranged in the carrier plate. On the other hand, the invention discloses a high-integration-level composite electronic component group which comprises at least two flat component groups which are fixedly connected through a bonding medium layer. The bonding medium layer does not need to play a supporting role, so that the thickness of the bonding medium layer can be far smaller than the thickness of a first lamination layer in a lamination mode, namely far smaller than 0.2 mm, space can be saved, and on the other hand, the lamination layer above the hollow area can be manufactured according to a conventional process, so that the process can be simplified.

The invention discloses a gel polymer electrolyte based on a flame-retardant local high-concentration electrolyte, a preparation method of the gel polymer electrolyte and application of the gel polymer electrolyte in a battery. The preparation method comprises the following steps: S1, mixing a lithium salt with a non-combustible phosphate solvent, and then adding a diluent to obtain a basic electrolyte; s2, dissolving a monomer and a free radical initiator in the basic electrolyte to form a precursor solution; and S3, carrying out reaction on the precursor solution at 60-80 DEG C for 4-24 hours to obtain the gel polymer electrolyte. The prepared gel polymer electrolyte has a unique ion solvation structure in a local high-concentration electrolyte, a good solid electrolyte interface film (SEI) can be formed, the in-situ preparation method of the polymer electrolyte can reduce the interface impedance, and the gel polymer electrolyte shows excellent performance in the aspects of stabilizing a nickel-rich positive electrode interface and adjusting the lithium deposition form. While good electrochemical stability of a phosphatide-based electrolyte with good flame retardance and a high-nickel lithium metal battery system is considered, the construction mode of an anion-rich solvation structure is expanded.

The lithium ion secondary battery comprises a positive plate, a negative plate, electrolyte and a diaphragm, the negative plate comprises a negative current collector and a negative active layer arranged on the negative current collector, the negative active layer comprises a first active layer and a second active layer which are arranged on the surface of the negative current collector, and the second active layer is arranged on the surface, far away from the negative current collector, of the first active layer; the first active layer comprises a first negative electrode active material, and the first negative electrode active material comprises first graphite; the second active layer comprises a second negative electrode active material, and the second negative electrode active material comprises silicon carbon; the electrolyte comprises 1, 3, 6-hexane trinitrile, the mass content of the 1, 3, 6-hexane trinitrile in the electrolyte is 0.5 wt%-10wt%, and the battery provided by the invention has a relatively high cycle capacity retention ratio.

The invention provides an array substrate, a display panel and a display device. The array substrate is provided with an array area and a peripheral area arranged around the array area. The array substrate comprises a substrate, a driving circuit layer and a shading layer. The driving circuit layer is arranged on one side of the substrate and comprises a plurality of signal wires arranged in the array area. The shading layer is arranged between the substrate and the driving circuit layer and comprises at least two conductive layers arranged in a stacked mode and a plurality of connecting lines located in the peripheral area, and the connecting lines are connected with the signal wires respectively.

The invention provides nitrogen-doped carbon-coated lithium manganese iron phosphate as well as a preparation method and application thereof, and relates to the technical field of lithium ion batteries. Specifically, a solution containing a phosphorus source, a lithium source, an iron source and a manganese source is mixed and ground to obtain a first material; a dispersing agent is added into the first material, mixing and grinding are conducted, a second material is obtained, and the dispersing agent comprises at least one of chitosan, polyvinylpyrrolidone or polyethyleneimine; and sequentially carrying out spray drying, sintering and crushing on the second material to obtain the lithium iron manganese phosphate positive electrode material. By adopting a specific type of organic dispersing agent and introducing through a specific technological process, grain agglomeration can be effectively avoided, and the conductivity and carbon coating stability of the lithium manganese iron phosphate material are improved, so that the electrochemical performance of the positive electrode material is effectively improved; meanwhile, the preparation method is simple and easy to implement, and has a prospect of batch application.

The invention relates to the technical field of secondary batteries, in particular to a negative electrode pre-lithiation method and a lithium ion battery. The negative electrode pre-lithiation method comprises the following steps: a film forming step: forming a lithium metal film on the surface of a negative electrode piece; and a formation step: standing the negative pole piece with the lithium metal film in an electrolyte to obtain a pre-lithiated negative pole piece. An electrolyte in the formation step comprises an organic solvent, a lithium salt, a diluent and an additive. The lithium salt is dissolved in the organic solvent, and the mass fraction of the lithium salt in the electrolyte is 10%-20%; the diluent is a substituted or unsubstituted aromatic compound, and the mass fraction of the diluent in the electrolyte is 20-50%; the additive is a fluoro-carbonate additive with the reduction potential higher than that of the organic solvent, and the mass fraction of the additive in the electrolyte is 1%-20%. The negative pole piece of the lithium ion battery prepared by the method can improve the circulation of the lithium ion battery and reduce the side reaction of the battery at high temperature.

The invention provides an electrolyte and a lithium ion battery. The electrolyte comprises the following components in percentage by mass: 10-18% of lithium salt; 0.5%-10% of a film forming agent; 0.05%-5% of an impregnating compound; and the balance of a solvent; the structural formula of the impregnating compound is # imgabs0, R1-R6 are independently selected from any one of sulfonate groups, hydrogen, halogen, substituted or unsubstituted C1-C10 alkyl groups, substituted or unsubstituted C1-C10 alkoxy groups, substituted or unsubstituted C3-C10 cycloalkyl groups, substituted or unsubstituted C2-C10 alkenyl groups and substituted or unsubstituted C2-C10 alkynyl groups, and at least one substituent group in the R1-R6 is halogen or sulfonate groups. The electrolyte has relatively low impedance, so that the cycle stability of the lithium ion battery under a fast charge condition is favorably improved.