47results about How to "Increased gravimetric energy density" patented technology

Some embodiments of the present invention provide an improved rechargeable lithium battery. This rechargeable lithium battery includes a cathode current collector with a coating of cathode active material. It also includes an electrolyte separator, and an anode current collector with a coating of anode active material. Within this rechargeable battery, the thickness of the coating of cathode active material and the thickness of the coating of anode active material are selected so that the battery will charge in a predetermined maximum charging time with a predetermined minimum cycle life when the battery is charged using a multi-step constant-current constant-voltage (CC-CV) charging technique. Note that using the multi-step CC-CV charging technique instead of a conventional charging technique allows the thickness of the cathode active material and the thickness of the anode active material to be increased while maintaining the same predetermined maximum charging time and the same predetermined minimum cycle life. This increase in the thickness of the active materials effectively increases both the volumetric and gravimetric energy density of the battery cell.

The energy density of the entire cell may be improved while retaining high power density by use of an alkali metal transition metal polyanion compound as the cathode and a thin film metal or metalloid anode. The thin film anode may be initially unalloyed or partially unalloyed. During use, the thin film anode may be only partially unalloyed relative to the theoretical maximum. The high volumetric capacity of the metal anode makes it possible to use a dense or porous thin film anode in conjunction with a relatively thin particle-based cathode to thereby improve the energy density of the cell.

The invention relates to a method for fabricating a regenerative polysulfide-scavenging layer (RSL). The method includes embedding nanowires or nanocrystals of metal oxides with a membrane of carbon nanotubes (CNTs); and forming the RSL with the embedded nanowires or nanocrystals of the metal oxides and the membrane, so as to enable lithium-sulfur batteries with high energy density and prolonged cycling life. The invention also relates to a lithium-sulfur battery that contains the RSL.

The present invention discloses a positive electrode current collector, a positive electrode sheet and an electrochemical device. The positive electrode current collector comprises: a support layer having two opposite surfaces in the thickness direction thereof; and a conductive layer disposed on at least one of the two surfaces of the support layer; wherein the thickness D1 of the conductive layer is greater than or equal to 300nm and less than or equal to 2mu m, and preferably, the thickness D1 is greater than or equal to 500nm and less than or equal to 1.5 mu m; and when the tensile strainof the positive electrode current collector is 1.5%, the square resistance growth rate T of the conductive layer is less than or equal to 30%. The positive electrode current collector provided by theinvention can give consideration to relatively high safety performance and electrical performance at the same time, so that the positive electrode piece and the electrochemical device adopting the positive electrode current collector can give consideration to relatively high safety performance and electrochemical performance at the same time.

The invention discloses a negative current collector, a negative pole piece and an electrochemical device. The negative current collector comprises a support layer and a conductive layer arranged on at least one of two opposite surfaces in the thickness direction of the support layer, wherein the density of the support layer is smaller than that of the conductive layer; the thickness D1 of the conducting layer is larger than or equal to 300 nm and smaller than or equal to 2 micrometers, and preferably, D1 is larger than or equal to 500 nm and smaller than or equal to 1.5 micrometers. When thetensile strain of the negative current collector is 1.5%, the square resistance growth rate T of the conductive layer is less than or equal to 5%. The negative electrode current collector provided bythe invention can simultaneously consider low weight and good conductivity and current collection performance, so that the electrochemical device can simultaneously consider relatively high weight energy density and good comprehensive electrochemical performance.

To provide a non-aqueous electrolyte storage element, including: a positive electrode which includes a positive-electrode active material capable of intercalating or deintercalating anions; a negative electrode which includes a negative-electrode active material capable of storing or releasing metallic lithium or lithium ion, or both thereof, a first separator between the positive electrode and the negative electrode; and a non-aqueous electrolyte which includes a non-aqueous solvent and a lithium salt dissolved in the non-aqueous solvent, wherein the non-aqueous electrolyte storage element includes a solid lithium salt at 25° C. and a discharge voltage of 4.0V, wherein the non-aqueous electrolyte storage element includes an ion-exchange membrane between the first separator and the positive electrode, between the first separator and the negative electrode, or between the first separator and the positive electrode and between the first separator and the negative electrode.

The application belongs to the field of batteries and relates to a current collector. The current collector includes an insulating layer and a conducting layer, wherein the conductive layer is positioned on at least one surface of the insulating layer; the current collector further comprises a first protective layer arranged on a surface, far away from the insulating layer, of the conducting layer; a plurality of holes penetrating through the insulating layer, the conducting layer and the first protective layer are formed in the current collector; and the first protective layer is a metal oxide protective layer. According to the current collector provided by the invention, short-circuit resistance during a short circuit under the abnormal condition of a battery can be improved, so that heat generated the short circuit can be greatly reduced, and therefore, the safety performance of the battery is improved; the mechanical strength of the conductive layer can be improved through the protective layer; the working stability of the current collector is improved; the service life of the current collector is prolonged; the plurality of holes penetrating through the insulating layer and the conductive layer can facilitate the passage of electrolyte, and therefore, the wettability of the electrolyte can be improved, and the electrochemical performance of the battery and the weight energy density of the battery can be improved.

To provide a non-aqueous electrolyte storage element, including: a positive electrode which includes a positive-electrode active material capable of intercalating or deintercalating anions; a negative electrode which includes a negative-electrode active material capable of storing or releasing metallic lithium or lithium ion, or both thereof; a first separator between the positive electrode and the negative electrode; and a non-aqueous electrolyte which includes a non-aqueous solvent and a lithium salt dissolved in the non-aqueous solvent, wherein the non-aqueous electrolyte storage element includes a solid lithium salt at 25° C. and a discharge voltage of 4.0 V, wherein the non-aqueous electrolyte storage element includes an ion-exchange membrane between the first separator and the positive electrode, between the first separator and the negative electrode, or between the first separator and the positive electrode and between the first separator and the negative electrode.

The invention discloses a cabinet type container for energy storage and an energy storage system. The cabinet type container comprises a cabinet body in the shape of a rectangular box body, the two side faces of the cabinet body in the width direction are of an open structure, a plurality of vertical plates are arranged in the cabinet body in parallel, and all the vertical plates are evenly arranged at intervals in the width direction of the cabinet body. A plurality of transverse plates are uniformly arranged between adjacent vertical plates in parallel at intervals, battery modules are oppositely arranged on each transverse plate at intervals, a rectangular air duct notch is formed in the center of the top surface of the cabinet body, and the air duct notch downwards cuts all the vertical plates and the transverse plates between the two vertical plates located on the outermost side from the top surface of the cabinet body. A plurality of openable cabinet doors are arranged on the two side faces of the cabinet body in the width direction. According to the energy storage system, a traditional maintenance passage is omitted, doors are opened on the two sides, the integral battery rack is adopted, installation and maintenance are convenient and fast, meanwhile, the energy density can be improved, installation of the battery modules on the battery rack is improved, and the structural stability of the energy storage system is improved.

A method of inhibiting sulfur shuttle behaviors in lithium-sulfur batteries comprising the steps of combining S-adsorbent nanoparticles deposited by atomic layer deposition (ALD) or / and molecular layer deposition (MLD) and flexible polymeric films deposited by MLD

The invention discloses a lithium ion secondary battery, a battery cell and a negative pole piece. The lithium ion secondary battery comprises a battery cell and electrolyte, the battery cell comprises a positive pole piece, an isolating membrane and a negative pole piece, the positive pole piece comprises a positive current collector and a positive active material layer arranged on the surface ofthe positive current collector, and the negative pole piece comprises a negative current collector and a negative active material layer arranged on the surface of the negative current collector, wherein the positive current collector and / or the negative current collector are / is a composite current collector, the composite current collector comprises an organic support layer and a conductive layerarranged on at least one surface of the organic support layer, and the heat conductivity coefficient of the composite current collector is 0.01 W / (m.K) to 10W / (m.K), preferably 0.1 W / (m.K) to 2W / (m.K). The lithium ion secondary battery provided by the invention has the good low-temperature performance.

The invention discloses a high-energy-density long-service-life fast-charging lithium ion battery and a preparation method thereof, wherein the low temperature is -20 DEG C, the multiplying power of rapid charging is 1C and 2C respectively, the multiplying power of rapid discharging is 1C and 3C respectively, the lithium ion battery mainly consists of five parts, namely a positive electrode sheet,a negative electrode sheet, a ceramic diaphragm, an electrolytic solution and a battery shell, and is prepared by combining and laminating the positive electrode sheet, the ceramic diaphragm, the negative electrode sheet and the ceramic diaphragm, putting into the battery shell, injecting the electrolytic solution and carrying out opening formation, sealing and grading capacity. According to theinvention, through preferable materials of lithium nickel cobalt aluminate, a silicon-carbon composite material, a macromolecular plasticizer, a nano-microporous carbon-coated aluminum net, a nano-microporous copper net, a high-temperature insulating tape, a polymer adhesive, a ceramic diaphragm, an electrolytic solution, a battery shell and the like and a preferable process technology, the beneficial effects of the battery are completely achieved, and the battery is suitable for application in the fields of 3C, power, energy storage and the like.

The invention discloses a negative current collector, a negative pole piece and an electrochemical device. The negative current collector comprises a support layer and a metal conductive layer arranged on the support layer, the ratio of the density of the metal conductive layer to the intrinsic density of the material of the metal conductive layer is greater than or equal to 0.7, and the metal conductive layer is made of one or more of copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy. The negative electrode current collector provided by the invention can simultaneously consider relatively low weight and relatively high electrical performance, so that the electrochemical device can simultaneously consider relatively high weight energy density andelectrochemical performance.

In order to provide a positive electrode with excellent peeling resistance and bending resistance, and a nonaqueous electrolyte secondary battery having excellent gravimetric energy density and little dependency on the amount of electrolyte, this positive electrode: is used in a nonaqueous electrolyte secondary battery provided with said positive electrode and a negative electrode, a separator disposed between the positive electrode and negative electrode, and an electrolyte having ion conductivity; and contains (a) a conductive polymer, (b) a polyanionic acid and / or a metal salt thereof, and (c) a plasticizer.

The invention is applicable to the technical field of batteries, and provides a paper current collector, a preparation method thereof, an electrode and a battery. The paper current collector comprisesa multi-layer structure fiber layer, a metal plating layer and a carbon substrate coating. The multi-layer structure fiber layer comprises at least one nano cellulose raw paper layer, and the two sides of the nano cellulose raw paper layer are both provided with a composite paper coating; the metal plating layer is arranged on one side, far away from the nano cellulose base paper layer, of the composite paper coating; the carbon substrate coating is arranged on one side, far away from the composite paper coating, of the metal plating layer; the composite paper coating comprises nano cellulose, an inorganic filler and a nano rubber additive. The composite paper coating is arranged on the two sides of the nano cellulose raw paper layer so that the nano cellulose raw paper layer has good strength and waterproof performance. In addition, the lithium ion battery prepared from the paper current collector has relatively high weight energy density and relatively high safety performance.

The invention discloses a positive electrode current collector, a positive electrode plate and an electrochemical device. The positive electrode current collector comprises a support layer and a metalconductive layer arranged on the support layer, wherein the ratio of the density of the metal conductive layer to the intrinsic density of the material of the metal conductive layer is greater than or equal to 0.89, and the metal conductive layer is made of one or more of aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy. The positive electrode current collector provided by the invention can give consideration to relatively low weight and relatively high electrical property at the same time, so that the electrochemical device can give consideration to relatively high weight energy density and electrochemical property at the same time.

The invention discloses a novel square lithium battery standardized module encapsulation case and a PACK method. The novel square lithium battery standardized module encapsulation case comprises an upper box, a lower box, a box cover and an electrode substrate, wherein the centers of the front end and the rear end of the outer side of the box cover are inward punched to form a mounting groove, a mounting boss is formed on the front end and the rear end of the inner side of the box cover, a strip-shaped clamp slot is formed in the outer side end of the mounting groove, the electrode substrate is fixedly connected with the mounting boss, a first card is arranged at the center of one side of the electrode substrate, and is vertically folded to form a second card, and the second card is foldedto form a third card; the electrode substrate is arranged inside the box cover; the upper box and the lower box are mutually clamped to form a standardized battery pack unit; and a plurality of standardized battery pack units are sequentially spiced. Through the mutually embedded structure design and automatic mutual embedded limitation, a large battery pack is facilitated to be efficiently and rapidly assembled, all welding technologies can be avoided, the battery packing cost can be effectively lowered, and the disassembling and maintenance are also convenient; the heat dissipation effect is obvious, meanwhile the weight is lightened, and the weight energy density of the battery module is beneficially improved.

A nonaqueous electrolyte secondary battery is provided, which includes a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and an electrolyte solution containing a supporting salt having ionic conductivity, wherein the positive electrode contains an electrically conductive polymer, the negative electrode contains a carbonaceous material capable of lithium ion insertion / desertion, and the electrolyte solution contains a negative electrode film-forming agent. Consequently, the nonaqueous electrolyte secondary battery, which uses the electrically conductive polymer in the positive electrode and the carbonaceous material in the negative electrode, has an excellent weight energy density and can effectively suppress deterioration of battery performance.

The embodiment of the invention provides a composite base material, a preparation method of the composite base material, a battery and an electric vehicle, and relates to the technical field of lithium battery manufacturing. The composite base material comprises an insulating substrate, the insulating substrate comprises a first surface and a second surface which are oppositely arranged, the firstsurface is provided with a first metal layer, and the second surface is provided with a second metal layer; wherein the widths of the first metal layer and the second metal layer are respectively greater than the width of the insulating substrate, and the part of the first metal layer exceeding the width of the insulating substrate and the part of the second metal layer exceeding the width of theinsulating substrate are bonded and electrically conducted; a conductive coating is arranged on the side, away from the insulating substrate, of the first metal layer and located in the area oppositeto the insulating substrate, and a conductive coating is arranged on the side, away from the insulating substrate, of the second metal layer and located in the area opposite to the insulating substrate. The composite base material is beneficial to improving the weight energy density of the lithium ion battery and improving the conductive contact performance between the metal layers and the pole piece active substance coatings.

The invention relates to the field of batteries, and discloses a multi-carbon battery, which comprises a first porous active carbon layer (1), a metal oxide layer (3) and a second porous active carbonlayer (5), wherein a first separation membrane layer (2) is arranged between the first porous active carbon layer (1) and the metal oxide layer (3), a second separation membrane layer (4) is arrangedbetween the second porous active carbon layer (5) and the metal oxide layer (3), the first porous active carbon layer (1) specifically comprises 80% of active carbon, 15% of acetylene black, and 5% of a thickener, the metal oxide layer (3) specifically comprises 75% of a phosphorus iron carbonate lithium mixture, 20% of carbon black, and 5% of a gel binder, and the second porous active carbon layer (5) specifically comprises 80% of active carbon, 15% of acetylene black, and 5% of a thickener. The multi-carbon battery of the present invention has advantages of long cycle life, fast charging time and high storage efficiency.

The invention discloses a positive pole current collector, a positive pole piece and an electrochemical device. The positive pole current collector comprises a support layer and a conductive layer arranged on the support layer, the conductive layer is made of aluminum or aluminum alloy, and the thickness D1 of the conductive layer is greater than or equal to 300nm and less than or equal to 2mu m;the elongation at break B of the supporting layer is greater than or equal to 12% and greater than or equal to 10000%; the volume resistivity of the supporting layer is greater than or equal to 1.0 *10 <5> ohm.m; when the tensile strain of the positive electrode current collector is 2%, the square resistance growth rate T1 of the conductive layer is less than or equal to 10%. The positive electrode current collector provided by the invention can give consideration to relatively high safety performance and electrical performance at the same time, so that the positive electrode piece and the electrochemical device adopting the positive electrode current collector can give consideration to relatively high safety performance and electrochemical performance at the same time.

Embodiments of the present invention provide a composite substrate and a preparation method thereof, a battery and an electric vehicle, and relate to the field of batteries. The composite substrate has tab forming regions and thinning regions alternately arranged, and the composite substrate includes an insulating layer, a first metal layer, a second metal layer, a first adhesive layer, a second adhesive layer and a conductive adhesive layer. In the thinned area, the first adhesive layer and the second adhesive layer are respectively disposed on opposite sides of the insulating layer, the first adhesive layer is connected to the first metal layer, and the second adhesive layer is connected to the second metal layer . Both the first adhesive layer and the second adhesive layer extend from the thinned area to the lug forming area and are connected to the conductive adhesive layer. In the lug forming area, the first metal layer and the second metal layer are respectively disposed on opposite sides of the conductive adhesive layer, and the first metal layer is electrically connected to the second metal layer. The embodiment of the present invention can increase the weight energy density of the battery, is convenient for welding, has strong adhesion, and is beneficial to improving the cycle performance of the battery.

Embodiments of the present invention provide a composite substrate, a method for preparing the composite substrate, a battery and an electric vehicle, and relate to the technical field of lithium battery manufacturing. The composite base material includes an insulating base, the insulating base includes a first surface and a second surface oppositely arranged, the first surface is provided with a first metal layer, and the second surface is provided with a second metal layer; the first metal layer and the second metal layer The widths of the layers are respectively larger than the width of the insulating base, and the part of the first metal layer exceeding the width of the insulating base is bonded to and electrically connected with the part of the second metal layer exceeding the width of the insulating base; the first metal layer is away from the side of the insulating base, And the area opposite to the insulating base is provided with a conductive coating, the side of the second metal layer away from the insulating base is provided, and the area opposite to the insulating base is provided with a conductive coating. The composite base material is beneficial to increase the gravimetric energy density of the lithium-ion battery, and improve the conductive contact performance between the metal layer and the pole piece active material coating.

The invention discloses a battery cell, a battery module and a battery pack, and relates to the technical field of batteries. The battery cell comprises a shell, a roll core and an electrolyte, the roll core and the electrolyte are arranged in the shell, and the roll core is formed by laminating or winding a positive plate, an isolating membrane and a negative plate which are arranged in a laminated manner; the positive plate comprises a positive current collector and a positive active material, the negative plate comprises a negative current collector and a negative active material, at least one of the positive current collector and the negative current collector is a composite current collector, the composite current collector comprises an insulating support layer and a conductive layer at least arranged on one side of the insulating support layer, the thickness of the insulating support layer is A, the thickness of a positive electrode active material layer formed after the positive electrode current collector is coated with the positive electrode active material and rolled is C; the thickness of the isolating membrane is B; the thickness of the roll core is D; a, B, C, and D satisfy 0.46 < = (A + B + C) / (D * 1000) < = 11.36. The battery cell has the advantages of high energy density and high safety performance.

The problem to be solved by the present invention is to suppress degradation of an electrode assembly due to heat in a lithium secondary battery in which the gravimetric energy density is greatly improved compared to a conventional lithium secondary battery. This lithium secondary battery (1) is provided with: an electrode assembly (C) having a structure in which positive electrodes (10) and negative electrodes (20) are alternately stacked with separators (30) interposed therebetween, and having a gravimetric energy density of 250 Wh / Kg or more; and heat dissipation layers (51, 52) provided onthe surface of the electrode assembly (C). Compared with a common lithium secondary battery, the heat generation of the central part of the electrode assembly (C) is very large. However, since the lithium secondary battery (1) is provided with heat rejection layers (51, 52) on the surface of the electrode assembly (C), the thermal gradient between the center portion of the electrode assembly (C)and the heat rejection layers (51, 52) is increased, and heat concentrated in the center portion of the electrode assembly (C) can be efficiently dissipated to the outside. The present invention is useful for stably supplying energy, i.e., achieving sustainable development goals.

The invention discloses a battery cell, a battery module and a battery pack, and relates to the technical field of batteries. The battery cell comprises a shell, a roll core and an electrolyte, the roll core is formed by laminating or winding a positive plate, an isolating membrane and a negative plate which are arranged in a laminated manner, the ratio of the capacity of the battery cell to the surface area of the battery cell is C, and the unit is Ah / cm < 2 >; the positive plate comprises a positive current collector, the negative plate comprises a negative current collector, the positive current collector and / or the negative current collector are / is a composite current collector, the composite current collector comprises an insulating support layer and a conductive layer at least arranged on one side of the insulating support layer, the thickness of the insulating support layer is A, the unit is mu m, the thickness of the conductive layer is B, and the unit is mu m; and the thickness A of the insulating supporting layer, the thickness B of the conductive layer and the ratio C of the capacity of the battery cell to the surface area of the battery cell satisfy 3 < = A / (10 * B * C) < = 80. The battery cell has the advantages of high energy density and high safety performance.

The invention provides a stack type lithium ion battery, which comprises a positive electrode current collector, a negative electrode current collector, an electrolyte layer, a positive electrode active material layer and a negative electrode active material layer, wherein the electrolyte layer is arranged between the positive electrode current collector and the negative electrode current collector, the positive electrode active material layer is arranged between the positive electrode current collector and the electrolyte layer, the negative electrode active material layer is arranged betweenthe negative electrode current collector and the electrolyte layer, and a sealant is arranged between the positive electrode current collector and the negative electrode current collector. The invention also provides a lithium ion battery pack based on the stack type lithium ion battery. The lithium ion battery provided by the invention is the development direction of the next generation of lithium battery, the energy density of the battery is greatly improved, and the cost is reduced.

The invention discloses a positive electrode collector, a positive electrode sheet and an electrochemical device. The positive electrode collector includes: a support layer having two opposite surfaces in its own thickness direction; a conductive layer arranged on two sides of the support layer. On at least one of the surfaces; wherein, the thickness D of the conductive layer 1 300nm≤D 1 ≤2μm, preferably 500nm≤D 1 ≤1.5 μm; when the tensile strain of the positive current collector is 1.5%, the increase rate T of the sheet resistance of the conductive layer is T≤30%. The positive current collector provided by the present invention can simultaneously take into account high safety performance and electrical performance, so that the positive electrode sheet and electrochemical device using it can simultaneously take into account high safety performance and electrochemical performance.