46results 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 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.

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 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 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 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.

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 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, the thickness of the insulating support layer is A, the thickness of the conductive layer is B, and the thickness of the isolating membrane is C; the thickness of the roll core is D; the ratio of the capacity to the surface area of the cell is F; a, B, C, D, and F satisfy 10 < = A * C * (F/107)/(B * D/1000) * 107 < = 30000. The battery cell has the advantages of high energy density and high safety performance.