9923results about "Positive electrodes" patented technology

The invention relates to the technical field of batteries, in particular to a battery. Comprising a positive plate and electrolyte, the positive plate comprises a positive current collector and a coating positioned on the surface edge of at least one side of the positive current collector along the length direction; the coating comprises filling particles, and the filling particles comprise at least one of inorganic particles and nitrogen-containing particles; the electrolyte comprises non-fluorinated cyclic carbonate and fluorinated ethyl acetate; the non-fluorinated cyclic carbonate comprises propylene carbonate and optional ethylene carbonate; on the basis of the total mass of the electrolyte, the content ratio C1 of the non-fluorinated cyclic carbonate is smaller than or equal to 25%, the content ratio C11 of the propylene carbonate is 3.1%-24.9%, the content ratio C12 of the ethylene carbonate is 0%-5%, and the content ratio C2 of the fluorinated ethyl acetate is 20.2%-70%. The battery provided by the invention can improve the problem of lithium precipitation under low-temperature discharge, and has relatively good short-circuit safety performance and relatively low high-temperature gas production rate.

A positive electrode material of the present disclosure includes: a positive electrode active material; and a first solid electrolyte material coating at least partially a surface of the positive electrode active material, wherein the first solid electrolyte material includes Li, Ti, M1, and F, and the M1 is at least one element selected from the group consisting of Ca, Mg, Al, Y, and Zr.

The invention discloses a negative electrode interface modification material, a negative electrode plate, a positive electrode interface functional layer, a positive electrode plate, a solid-state battery and a power utilization device, and relates to the technical field of batteries, the negative electrode interface modification material comprises a first polymer matrix, a reinforcing filler, a conductive agent and a lithium salt, the modulus of the reinforcing filler is greater than 50 GPa. The tensile strength of the negative electrode interface modification material can be improved through the first polymer matrix, breakage of a negative electrode interface modification layer is reduced, interface impedance is reduced, meanwhile, the first polymer matrix can be matched with the expansion coefficient of a silicon-based material, and bulging of a negative electrode plate is reduced. The modulus of the reinforcing filler is greater than 50GPa, so that the modulus of the negative electrode interface modification layer can be improved, the expansion of the silicon-based active material is further inhibited, the conductive agent can relieve the problem that the flexible substrate interface of the copper foil and the negative electrode interface modification layer possibly causes unsmooth electron transmission, and the lithium salt can improve the ion conduction capability and reduce the interface impedance.

The present invention relates to a positive electrode material including a plurality of single particle-based positive electrode active material particles, wherein the single particle-based positive electrode active material particle includes 1 to 30 primary particles, the product of an arithmetic mean value of the circularities of the primary particles and an arithmetic mean value of the convexities of the primary particles, which are measured from the segmentation image partitioned for each primary particle unit obtained by image-processing a scanning electron microscope (SEM) image of the positive electrode material, is at least 0.60, the circularity is defined by Equation 1 below, the convexity is defined by Equation 2 below, and the single particle-based positive electrode active material includes a lithium nickel-based oxide having a composition represented by Formula 1 below: Circularity=4πA / P2 wherein, in Equation 1 above, A is the area of each primary particle measured from the segmentation image, and P is the circumference of each primary particle measured from the segmentation image, Convexity=Pc / Pr wherein, in Equation 2 above, Pr is the actual circumference of each primary particle measured from the segmentation image, and Pc is the circumference of a virtual figure obtained by connecting the outermost points of each primary particle measured from the segmentation image, and         [Formula 1]     Lia[NixCoyM1zM21-x-y-z]O2 wherein, in Formula 1 above, M1 includes Mn, Al, or a combination thereof, M2 includes at least one selected from the group consisting of B, Ba, Ce, Cr, F, Mg, Al, V, Ti, Fe, Zr, Zn, Si, Y, Nb, Ga, Sn, Mo, W, P, and Sr, 1.0≤a≤1.3, 0.5≤x<1.0, 0<y<0.5, and 0<z<0.5.

The present invention relates to a positive electrode material comprising a plurality of single-particle-based positive electrode active material particles, each of which includes 1 to 30 primary particles, wherein the arithmetic average value of tortuosity of the primary particles as measured from a segmentation image divided for each primary particle unit, obtained by image processing of a scanning electron microscope (SEM) image of the positive electrode material, is 0.92 or greater, and the tortuosity is a value defined by equation (1). Equation (1): Tortuosity =Pc / Pr, where Pr is the real length of the perimeter of each primary particle measured in the segmentation image, and Pc is the length of the perimeter of a conceptual figure obtained by connecting outermost points of each primary particle measured in the segmentation image.

The invention relates to the technical field of lithium ion batteries, in particular to a composite lithium-rich manganese-based positive electrode material and a preparation method and application thereof. The composite lithium-rich manganese-based positive electrode material is of a three-layer structure and sequentially comprises a lithium-rich manganese-based oxide positive electrode material matrix, a first coating layer and a second coating layer from inside to outside, the first coating layer is a mixture of halide solid electrolyte and lithium-containing oxide; and the second coating layer is an oxide solid electrolyte. The conductivity of a contact interface with a positive electrode material can be improved, the resistance is reduced, the moisture absorption degradation of halide is inhibited, the packaging difficulty is reduced, and the cycle performance of the halide-added solid electrolyte after moisture absorption is improved.

A lithium manganese iron phosphate cathode material, including a first lithium manganese iron phosphate particle and a second lithium manganese iron phosphate particle. A molar ratio of Mn to Fe in the first lithium manganese iron phosphate particle is greater than or equal to 1. A molar ratio of Mn to Fe in the second lithium manganese iron phosphate particle is smaller than or equal to the molar ratio of Mn to Fe in the first lithium manganese iron phosphate particle. A particle size of the first lithium manganese iron phosphate particle is smaller than or equal to a particle size of the second lithium manganese iron phosphate particle. A preparation method of the lithium manganese iron phosphate cathode material and an application thereof are provided. The first precursor, having a manganese content greater than or equal to that of iron, inhibits crystal growth during sintering, resulting in a smaller particle size. The second precursor, having a manganese to iron ratio smaller than or equal to the ratio in the first precursor, promotes crystal growth during sintering, resulting in a larger particle size. This results in a particle size grading between large particles and small particles, improves the spatial utilization of particle packing, and enhances the compaction density and volumetric capacity of the lithium manganese iron phosphate cathode material.

The application discloses a high-energy-density lithium ion battery, which comprises a positive electrode sheet and a negative electrode sheet, the positive electrode sheet comprises a positive electrode active material, the positive electrode active material comprises a lithium iron phosphate material and a lithium-rich material, the mass ratio of the lithium-rich material in the positive electrode active material is 0.2%-8%, and the chemical formula of the lithium iron phosphate material is Li 1+x Fe 1‑ y M y (PO4) 1+z , 0<=x<0.1, 0<=y<0.01, 0<=z<0.04, M comprises at least one of Ti, V, Zr, Nb, Mg, Mo, W and Al, the lithium-rich material comprises at least one of LFO and LNO, the chemical formula of the LFO is Li 5+a Fe 1‑b Z b O 4+c , 0<=a<0.5, 0<=b<0.01, 0<=c<0.03, Z comprises at least one of Ti, V, Zr, Nb, Mg, Mo, W and Al, and the chemical formula of the LNO is Li 2+d Ni 1‑ e Y e O 2+f , -0.5<=d<=0.5, e>=0, -0.5<=f<=0.5, Y comprises at least one of Ti, V, Al, Mg, Mn and Fe, and the negative electrode active material comprises a silicon negative electrode material, the mass ratio of the silicon negative electrode material in the negative electrode active material is 1%-50%. The application has the advantages of improving the energy density, rate performance and cycle performance of the lithium battery.

The invention provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises a carbon-coated lithium iron phosphate material. By regulating and controlling the relative proportion of the specific surface areas of carbon structures with different micromorphologies in the surface layer of the carbon-coated lithium iron phosphate material, specifically, the carbon-coated lithium iron phosphate material disclosed by the invention has a carbon coating factor eta, and when eta is more than or equal to 0.81 and less than or equal to 0.95, the lithium iron phosphate material has high-quality carbon coating; the lithium iron phosphate material capacity exertion is facilitated, the pole piece dehydration efficiency is remarkably improved, and the prepared battery monomer has excellent energy density, cycle performance and processing performance.

The invention relates to a positive plate, a battery comprising the positive plate and an electric device, and belongs to the technical field of batteries. According to the invention, the element M is doped in and / or coated on the surface of the nickel cobalt lithium manganate particles, the bond energy of the element M and O is controlled to be greater than the bond energy of Ni and O, and the ratio of the Fd3m phase thickness in the nickel cobalt lithium manganate particles and the ratio of the mass ratio of M to the relative mass ratio of Ni in the positive electrode material meet a specific relationship, so that the structural stability of the nickel cobalt lithium manganate is remarkably improved; the lithium ion transmission efficiency is higher, the fast charging performance is better, and the higher capacity performance can be realized.

The embodiment of the invention provides a lithium nickel manganese oxide composite material and a preparation method thereof, a positive plate and a battery. The lithium nickel manganese oxide composite material comprises an inner core and a shell coating at least part of the surface of the inner core, the inner core comprises a lithium nickel manganese oxide material, and the shell comprises a spinel phase oxide. According to the invention, the coating layer comprising the spinel phase oxide is formed on the surface of the lithium nickel manganese oxide, so that a stable ion transmission interface is obtained, and the obtained lithium nickel manganese oxide composite material has structural stability and high rate performance under high voltage.

The present invention relates to a cathode material comprising a plurality of discrete-particle-based cathode active material particles. Each of the discrete-particle-based cathode active material particles comprises 1 to 30 primary particles, the ratio of the arithmetic average value of the circularities of the primary particles to the average aspect ratio of the primary particles, which is measured from a segmentation image segmented by primary particle unit and obtained through processing of a scanning electron microscope (SEM) image of the cathode active material, is 0.45 or more, the circularity is defined by the relation 1, and the discrete-particle-based cathode active material comprises a lithium nickel-based oxide having the composition represented by [chemical formula 1]. [Relation 1] Circularity = 4πA / P2 In relation 1, A is the area of each primary particle measured in the segmentation image, and P is the circumferential length of each primary particle measured in the segmentation image. [Chemical formula 1] Lia[NixCoyM1zM21-x-y-z]O2 In chemical formula 1, M1 includes Mn, Al or a combination thereof, M2 includes at least one selected from the group consisting of B, Ba, Ce, Cr, F, Mg, Al, V, Ti, Fe, Zr, Zn, Si, Y, Nb, Ga, Sn, Mo, W, P and Sr, 1,0≤a≤1.3, 0.5≤x<1.0, 0<y<0.5 and 0<z<0.5.

The invention relates to the technical field of batteries, in particular to a battery which comprises a positive plate, a negative plate and a diaphragm, the diaphragm is located between the positive plate and the negative plate, in the thickness direction of the positive plate, the positive plate comprises a first surface and a second surface which are opposite to each other, the first surface comprises a plurality of concave parts, and the depth D2 of each concave part is 3-50 microns; the diaphragm comprises a base material layer and an organic coating located on at least one side surface of the base material layer, and the organic coating comprises organic particles. Through the synergistic effect of the organic coating of the diaphragm and the concave part structure of the positive plate, the high-temperature safety performance of the battery can be remarkably improved and the furnace temperature tolerance of the battery can be improved on the premise of not sacrificing the voltage stability and impedance performance in the high-temperature cycle process, so that the increasingly stringent high-temperature application requirement is met.

A solid-state battery, preferably a pouch cell, includes a cathode including cathode active material comprising Li ions, graphene, and optionally a binder; an electrolyte; and an anode, preferably a lithium anode, wherein said electrolyte is positioned in between said cathode and said anode.

The present application relates to a hybrid membrane for an electrochemical device, the hybrid membrane comprising: a membrane layer comprising: a modified metal-organic framework (MOF) material wherein the modified MOF material is a MOF material modified with one or more of a lithium salt, a carboxylic acid, or an amino acid, and a binder material, the adhesive layer is used for adhering the modified MOF material to the porous supporting layer so as to form a film layer on the porous supporting layer; and the porous support layer is used for providing mechanical support for the membrane layer. The present application also relates to a method for preparing the hybrid membrane, an electrochemical device comprising the hybrid membrane and the use of the hybrid membrane for inhibiting Lewis acid by-products in an electrochemical device.

The present invention relates to a positive electrode material comprising a plurality of single-particle-based positive electrode active material particles, each of which includes 1 to 30 primary particles, wherein the ratio of the arithmetic average value of the solidity of the primary particles to the average aspect ratio of the primary particles is 0.58 or more, as measured from a segmentation image divided for each primary particle unit, obtained by image processing of a scanning electron microscope (SEM) image of the positive electrode material, while the solidity is defined by equation 1, and the single-particle-based positive electrode active material includes a lithium-nickel-based oxide having a composition of [chemical formula 1]. [Equation 1] Solidity = Ar / Ac, where Ar is the real area of each primary particle measured in the segmentation image, and Ac is the area of a conceptual figure obtained by connecting outermost points of each primary particle measured in the segmentation image. [Chemical formula 1] Lia[NixCoyM1zM21-x-y-z]O2, where M1 includes Mn, Al, or a combination thereof, M2 includes at least one selected from the group consisting of B, Ba, Ce, Cr, F, Mg, Al, V, Ti, Fe, Zr, Zn, Si, Y, Nb, Ga, Sn, Mo, W, P, and Sr, and 1,0≤a≤1.3, 0.5≤x<1.0, 0<y<0.5, 0<z<0.5.

The present invention relates to a positive electrode material comprising a plurality of single-particle-based positive electrode active material particles. The single-particle-based positive electrode active material particles include 1 to 30 primary particles. The ratio of the arithmetic mean of the curvature of the primary particles to the average aspect ratio of the primary particles is at least 0.63 as measured from a segmentation image divided into units of primary particles and obtained by image-processing a scanning electron microscope (SEM) image of the positive electrode material. The curvature is defined by expression 1 below, and the single-particle-based positive electrode active material includes a lithium nickel-based oxide represented by chemical formula 1 below. [Expression 1]: Curvature = Pc / Pr In expression 1, Pr is the actual circumference of each primary particle measured in the segmentation image, and Pc is the circumference of a virtual figure obtained by connecting the outermost points of each of the primary particles measured in the segmentation image. [Chemical formula 1]: Lia[NixCoyM1zM21-x-y-z]O2 In chemical formula 1, M1 includes Mn, Al, or a combination thereof, M2 includes at least one selected from the group consisting of B, Ba, Ce, Cr, F, Mg, Al, V, Ti, Fe, Zr, Zn, Si, Y, Nb, Ga, Sn, Mo, W, P, and Sr, 1,0≤a≤1.3, 0.5≤x<1.0, 0<y<0.5, and 0<z<0.5.

To provide a positive electrode active material with high capacity and good cycle characteristics.SOLUTION: A positive electrode active material exhibits minimal change in crystal structure between the charged and discharged states. For example, a positive electrode active material that has a layered rock-salt crystal structure in the discharged state and a pseudo-spinel crystal structure in the charged state at a high voltage of about 4.6 V exhibits less change in crystal structure and volume between charge and discharge than known positive electrode active materials. When this pseudo-spinel crystal structure is present, diffraction peaks appear at 2θ=19.30±0.20° and 2θ=45.55±0.10° when analyzed by XRD.SELECTED DRAWING: Figure 1

The invention provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises a carbon-coated lithium iron phosphate material. By regulating and controlling the relative proportion of the specific surface areas of carbon structures with different micromorphologies in the surface layer of the carbon-coated lithium iron phosphate material, specifically, the carbon-coated lithium iron phosphate material disclosed by the invention has a carbon coating factor eta, and when eta is more than or equal to 0.81 and less than or equal to 0.95, the lithium iron phosphate material has high-quality carbon coating; the lithium iron phosphate material capacity exertion is facilitated, the pole piece dehydration efficiency is remarkably improved, and the prepared battery monomer has excellent energy density, cycle performance and processing performance.

The present application provides a battery cell, a battery device, and an electric device. The battery cell comprises a casing and an electrode assembly inside the casing, wherein the electrode assembly comprises a positive electrode sheet, a negative electrode sheet, and a separator between the two electrode sheets. The positive electrode sheet comprises a positive electrode current collector and a positive electrode active layer provided on at least one side of the positive electrode current collector; the positive electrode active layer comprises a positive electrode active material; and the positive electrode active material comprises a nickel-containing lithium transition metal oxide and a lithium-containing phosphate, wherein the molar amount of Ni in the nickel-containing lithium transition metal oxide accounts for 70% to 95% of the total molar amount of the transition metal. The positive electrode active material comprises Ni, Co, Mn, Fe and Li, and the ratio of the mass of Ni in the positive electrode active material to the total mass of Fe and Mn is between 0.15-2.

The application provides a lithium ion battery and an electric device, the lithium ion battery comprising a positive electrode sheet and an electrolyte, an active substance in the positive electrode sheet comprising a phosphate lithium positive electrode material and a lithium nickel cobalt manganese oxide, the electrolyte comprising a positive electrode film former, a negative electrode film former and a lithium salt, the lithium salt comprising lithium hexafluorophosphate and a lithium bisfluorosulfonylimide salt, the lithium ion battery satisfying the following formula: wherein NL is a mass ratio of the lithium nickel cobalt manganese oxide and the phosphate lithium positive electrode material, S alt is a value of a molar concentration of the lithium hexafluorophosphate and the lithium bisfluorosulfonylimide salt in the electrolyte in mol / L, and A dd is a mass ratio of the positive electrode film former and the negative electrode film former. The application can adjust the ratio of the positive electrode film former and the negative electrode film former and the ratio of the high-heat-resistance lithium salt according to the mixing ratio of the ternary material doped in the lithium manganese iron phosphate or the lithium iron phosphate, so that the cycle performance of the battery is improved.

The present application provides a cathode active material composition, a cathode sheet, a battery, and a power consuming device, wherein the cathode active material composition includes a first cathode active material and a second cathode active material having a crystal form different from that of the first cathode active material, the first cathode active material including a phosphate, and the particle size distribution curve of the cathode active material composition has at least two volume distribution peaks, where the volume distribution peak with the maximum peak intensity is designated as a first peak and the volume particle size distribution corresponding to the maximum peak intensity position of the first peak is designated as Dv1, the volume distribution peak with the next maximum peak intensity is designated as a second peak and the volume particle size distribution corresponding to the maximum peak intensity position of the second peak is designated as Dv2, and 0<|Dv1-Dv2| / Dv1≦50.

Embodiments described herein relate to electrochemical cells with multiple separators, and methods of producing the same. A method of producing an electrochemical cell can include disposing an anode material onto an anode current collector, disposing a first separator on the anode material, disposing a cathode material onto a cathode current collector, disposing a second separator onto the cathode material, and disposing the first separator on the second separator to form the electrochemical cell. The anode material and / or the cathode material can be a semi-solid electrode material including an active material, a conductive material, and a volume of liquid electrolyte. In some embodiments, less than about 10% by volume of the liquid electrolyte evaporates during the forming of the electrochemical cell. In some embodiments, the method can further include wetting the first separator and / or the second separator with an electrolyte solution prior to coupling the first separator to the second separator.

The present disclosure relates to a lithium-ion battery component and methods for manufacturing the lithium-ion battery component. The battery component, in some examples, includes a current collector, a porous deposit of first active material and first binder on the current collector, and a solvent-free electrode layer of second active material and second binder laminated with the porous deposit to at least partially occupy the pores of the porous deposit.

The invention belongs to the technical field of lithium ion battery materials, and discloses a preparation method of a high-first-effect small-particle single-crystal ultrahigh-nickel ternary positive electrode material. The method comprises the following steps: firstly, uniformly mixing an ultrahigh nickel ternary precursor with a lithium source and a tungsten source, performing mechanical densification and pressing to obtain a blocky solid, and then performing four-section program temperature control calcination to obtain a target material. The interface fusion resistance of single crystal growth can be reduced through mechanical densification; a part of the tungsten element forms a Li2WO4 coating layer, and a part of the dopant phase replaces Ni < 2 + >, so that grain growth can be inhibited, a crystal structure can be stabilized, and the first effect is improved; and the microstructure of the material can be accurately regulated and controlled through four-section temperature-controlled calcination. Through a coating-doping-single crystallization synergistic strategy, the electrochemical performance of the material in liquid and sulfide-based all-solid-state batteries is remarkably improved, the process is controllable, and the application prospect is wide.

The invention relates to a layered oxide material with high cycle stability and a preparation method and application thereof, the chemical formula of the layered oxide material is LiaNabNixMn (1-x) O2, 0 lt; xlt; 0.90 < = a < = 1, 0 < = b < = 0.1; the preparation method comprises the following steps: preparing a layered oxide precursor NaNi < x > Mn < 1-x > O < 2 >; mixing the precursor with a first lithium source, and then carrying out lattice site Li < + > / Na < + > replacement by at least one of molten salt ion exchange, solid phase ion exchange and liquid phase ion exchange to obtain an intermediate; cleaning the intermediate, performing solid-liquid separation, and drying to obtain a layered oxide material with high cycle stability; the layered oxide material is prepared through lattice site selective Li < + > / Na < + > replacement reaction, so that the obtained material has excellent cycling stability and specific capacity, and the method is simple in process, low in cost and suitable for large-scale production.

The embodiment of the invention provides a polyanionic positive electrode material and a preparation method thereof, a positive electrode plate, a secondary battery and an electric device, and belongs to the technical field of secondary batteries. The polyanionic positive electrode material is ferric sodium pyrophosphate, the polyanionic positive electrode material comprises primary particles and secondary spheres formed by the primary particles, and the primary particles comprise primary particles with the particle size Dv50 being d1 and primary particles with the particle size Dv50 being d2, d1gt; d2, the secondary sphere is of a core-shell structure, a core is of a porous structure, and a shell layer is of a compact structure. The polyanionic positive electrode material is relatively high in compaction density, and has the advantages of good cycle performance and good rate capability.

The invention provides an additive composition, an electrolyte thereof and a battery. The additive composition comprises a first additive and a second additive, the first additive comprises a compound with a structure as shown in a formula 1, and the second additive comprises a silane additive. When the additive composition provided by the invention is applied to the electrolyte, the cycle performance and the high-temperature performance of the battery can be improved.

The embodiment of the present application provides a positive electrode material, a secondary battery and an electric device, wherein the positive electrode material comprises a core and a coating layer arranged on the surface of the core, the core comprises a sodium ion layered oxide, and the coating layer comprises a spinel lithium salt. In the embodiment of the present application, the layered positive electrode material is tightly coated by the spinel lithium salt, so that the problem that the interface impedance of the positive electrode material of the existing sodium ion battery is large and the positive electrode adhesive is easily attacked is solved.

The invention discloses a composite coated modified positive electrode material, a preparation method thereof and a secondary battery, the composite coated modified positive electrode material provided by the invention comprises a positive electrode material and a composite coating layer on the surface of the positive electrode material, and the composite coating layer is composed of a fast ion conductor and a conductive polymer. The used fast ion conductor is a self-synthesized fast ion conductor and has the characteristics of stable crystal lattice, low surface brittleness and high ionic conductivity, the fast ion conductor and the conductive polymer are simultaneously coated on the surface of the positive electrode material to form a composite coating layer, and an electron-ion double-conduction transmission network is formed on the surface of the positive electrode material; the interface stability of the positive electrode material is enhanced, the volume expansion effect is relieved, and the electrochemical performance of the positive electrode material is comprehensively and effectively improved.