216results about How to "Improve fast charging performance" patented technology

The invention provides a preparation method of a high-capacity rapid charge graphite negative electrode material. According to the method, easily-graphitized coke/high-crystallinity graphite and difficultly-graphitized coke/hard carbon are secondarily granulated, asphalt is mixed to perform composite reaction, mixture is crushed after the composite reaction, the crushed mixture is graphitized, andthe graphitized mixture is modified and carbonized. The negative electrode material prepared by the method takes secondary granules serve as a core, the surfaces of the negative electrode material are wrapped by double layers, and the negative electrode material has the advantages of high capacity and good rapid charge performance and solves the problem that the capacity and rapid charge performance cannot be taken into account in the prior art.

Embodiments of the invention provide a silicon negative electrode material and a preparation method therefor, a negative electrode plate and a lithium ion battery. The silicon negative electrode material comprises a silicon inner core and a buffer coating layer and a first coating layer which coat the surface of the silicon inner core; the silicon negative electrode material is characterized in that the first coating layer is a coating layer formed by a carbon material; and the carbon material comprises at least one kind of doping elements of N, P, B, S, O, F, Cl and H. By virtue of the embodiments, the quick-charge performance of the silicon negative electrode material used as a battery negative electrode is improved.

The invention provides a positive plate with a special-shaped structure and a lithium ion battery comprising the positive plate. The positive plate comprises a positive current collector, a first positive active material layer and a second positive active material layer; the second positive active material layer is arranged on the surface of the positive current collector; the first positive active material layer is arranged on the surface of the second positive active material layer; and a positive electrode tab is arranged on the surface of the positive plate. In the length direction of thepositive electrode current collector, at a position close to the positive electrode tab, the thickness of the first positive electrode active material layer is gradually increased, and the thickness of the second positive electrode active material layer is gradually reduced; at a position far away from the positive electrode tab, the thickness of the first positive electrode active material layeris gradually reduced, and the thickness of the second positive electrode active material layer is gradually increased. Lithium is separated out from the surface of a negative plate near a negative electrode tab to form lithium dendrites, and potential safety hazards are brought about. With the positive plate adopted, the above problem can be solved.

The invention provides a negative plate, a preparation method and a lithium-ion battery comprising the negative plate. The negative plate comprises a negative current collector, and the negative current collector comprises a single-sided coating area and a double-sided coating area; in the double-sided coating region, second coating layers are arranged on the surfaces of the two sides of the negative electrode current collector respectively, each second coating layer comprises a first negative electrode active substance layer and a second negative electrode active substance layer, the second negative electrode active substance layers are arranged on the surface of the negative electrode current collector, and the first negative electrode active substance layers are arranged on the surfacesof the second negative electrode active substance layers. The lithium-ion battery comprising the negative plate has the following effects: (1) the lithium precipitation problem of a single-side coating area of a negative electrode of a lithium-ion battery with a conventional winding structure can be effectively improved, the cycle life of the lithium-ion battery is prolonged, and the cycle expansion of the lithium-ion battery is reduced; (2) the compaction of the negative electrode is improved, and the energy density of a cell is increased; (3) the dynamic performance of the negative electrode is improved, and the quick charging capacity of the battery is improved.

The invention discloses a preparation method of a high-multiplying-power quick charging graphite cathode material. The preparation method comprises the following steps: smashing a raw material, then graphitizing the raw material to obtain artificial graphite, then adhering the artificial graphite with a carbon source-containing adhesive together for mechanical fusion treatment, and carbonizing themixture to obtain the high-multiplying-power quick charging graphite cathode material. The raw material is one or more of petroleum coke or asphalt coke or coal coke; after the raw material is smashed, the particle size D50 is 3 to 10 [mu]m. Compared with the prior art, the preparation method disclosed by the invention has the advantages that the raw materials such as the petroleum coke are graphitized to obtain the artificial graphite and then are mixed with the adhesive for mechanical fusion, and the mixture is carbonized, so that the whole technological process is simple, and the raw materials are not required to be coated, and the cost is greatly reduced; due to single small particles, channels for allowing lithium ions to get in and get out are relatively short; furthermore, the surface is fused and coated with a layer of amorphous carbon, so that the isotropy of the material is improved, and the obtained graphite cathode material is high in multiplying power and very good in quick charging performance.

The invention discloses a fast-charging high-power winding column type lithium ion battery which comprises a positive pole piece, a negative pole piece and a porous isolating membrane, the positive pole piece, the negative pole piece and the porous isolating membrane are wound into a column type core body in sequence, a metal case is sheathed outside the core body, and an electrolytic liquid is injected into the metal case. The fast-charging high-power winding column type lithium ion battery is characterized in that a positive pole material is one or more than one of lithium cobalt oxide, lithium manganese oxide, three-element material, aluminum-doped nickel cobalt lithium, lithium iron phosphate and lithium vanadate; a negative pole material is one or more than one of graphite and lithium titanate. The positive current collector is a pretreated aluminum foil or aluminum mesh with the thickness of 8-30 micrometers; and the negative current collector is a copper foil, a copper mesh, a nickel-plated iron foil or a nickel-plated iron mesh with the thickness of 8-30 micrometers. An electrolyte in the electrolytic liquid is one or a mixture of lithium hexafluorophosphate and biethyl diacid lithium borate; and a solvent in the electrolytic liquid is a mixture of two or more than two of EC (Ethylene Carbonate), PC (Propylene Carbonate), DMC (Dimethyl Carbonate), DEC (Diethyl Carbonate), EA (Ethyl Acetate) and the like. In the invention, not only can high-power output of the battery be realized, but also the fast charging of the battery can be realized, and safety performance is high.

The invention relates to the field of lithium batteries, and especially relates to a high-capacity, high-compaction and quick-charge composite graphite negative electrode material. Artificial graphiteand natural graphite single particles are tightly anchored together through amorphous carbon to form a composite graphite secondary particle structure, and a layer of amorphous carbon is applied between the artificial graphite and the natural graphite particles and on the surface of each component particle in a coating manner. The defect that a graphite negative electrode material developed in the prior art cannot give consideration to high capacity, high compaction or quick charging performance is overcome, the advantages of the natural graphite are utilized to ensure the high capacity and high compaction performance of the material, meanwhile, the natural graphite is compounded with the artificial graphite with partial isotropy to buffer the expansion of the natural graphite, and the layer of amorphous carbon is formed between the artificial graphite and the natural graphite particles and on the surface of each single particle, so that the migration rate of lithium ions between thesurface of the graphite and different graphite is increased while the surface defects of the natural graphite are improved.

The invention provides a negative pole piece and a lithium ion battery comprising the negative pole piece. According to the negative pole piece, a first coating area with better quick charging performance and higher mass capacity is arranged on the surface of a negative current collector close to one side of a negative pole lug; a second coating area is arranged on the surface of the negative current collector away from one side of the negative pole lug; the negative pole piece can well solve the problem of lithium precipitation on the surface of the negative pole piece close to one side of the negative pole lug, is also suitable for the lithium ion battery in the high-rate charging process, solves the problem of lithium precipitation on the surface of the negative pole piece on one side of the negative pole lug. And the endurance performance of the lithium ion battery can be improved. Meanwhile, the preparation method of the negative pole piece is simple, and the preparation cost is low: materials used for preparing the negative pole piece are large-scale commercial materials, so that the cost is relatively low.

The invention discloses a graphite composite negative electrode material, a preparation method thereof and a battery. Specifically, the invention provides a graphite composite negative electrode material which comprises a graphite inner core and a coating layer coating the outer side of the graphite inner core. The coating layer comprises a titanium and lithium doped porous hard carbon composite material. Therefore, through the coating layer comprising the titanium and lithium doped porous hard carbon composite material, the lithium ion extraction rate of a negative electrode prepared from the graphite composite negative electrode material in the charging and discharging process can be improved, the rate capability and the cycle performance of the negative electrode are good, and the quick charging performance, the safety performance and the like of a battery using the negative electrode are improved.

The invention provides a cathode active material of a lithium ion secondary battery. The cathode active material comprises a carbon material core and a coating layer formed on the surface of the carbon material core, wherein the coating layer contains amorphous carbon and doping elements, and the doping elements include a nitrogen element. A carbon material is taken as a core of the cathode active material for the lithium ion secondary battery, and the coating layer containing the amorphous carbon and doping elements is arranged on the surface of the carbon material, so that the cathode active material has the advantages of long service life, high capacity, high magnifying power charge and discharge characteristics and low cost; by utilizing the cathode active material, the charging velocity of the battery can be effectively increased, and particularly, the rapid charging capacity of the battery at a low temperature can be effectively increased. The invention further provides a preparation method of the cathode active material, a cathode pole piece of the lithium ion secondary battery and the lithium ion secondary battery.

The invention provides a quick-charging type high-energy density lithium ion battery which comprises a positive pole part, a negative pole part, a diaphragm and an electrolyte. The positive pole partcomprises a positive pole material; the positive electrode material comprises a positive electrode conductive agent, and the positive electrode conductive agent is a mixture of two or more than two ofSuper P, KS-6, VGCF or CNTs; the negative pole part comprises a negative pole material; the negative electrode material comprises artificial graphite, and graphite particles are a mixture of primaryparticles and secondary particles; and the electrolyte is a low-impedance electrolyte. The fast-charging type high-energy-density lithium ion battery provided by the invention has 3C fast-charging capability and excellent cycle performance.

The invention provides a negative plate and a laminated lithium ion battery comprising the negative plate, and the laminated lithium ion battery using the negative plate can effectively improve the quick charging capacity of the laminated lithium ion battery on the premise of keeping the energy density not lost. The negative plate adopts the double-layer coating technology, the active substances and the surface density of the negative plate are specifically designed according to the potential and the polarization distribution of the negative plate, and the edge position of the negative plate is controlled to adopt double-layer coating by utilizing the double-layer coating technology; on the one hand, the accumulation mode of negative electrode active material particles can be changed through double-layer coating, edge polarization is reduced, reaction places are increased, internal resistance is reduced, and lithium precipitation cannot be generated on the edge; on the other hand, compared with single-layer coating, the double-layer coating can ensure that the charging speed capable of being supported under the same surface density is higher, so that the energy density cannot be lost.

The invention discloses a fast charging lithium titanate composite negativeelectrode piece and a lithium ion battery. The lithium titanate composite negative electrode piece comprises a negative electrode current collector, wherein one or both sides of the negative electrode current collector are sequentially provided with a lithium titanate composite layer and a lithium-supplementing layer in a direction away from the negative electrode current collector, and the lithium titanate composite layer comprises lithium titanate, graphene and carbon nanotubes according to a mass ratio of (90 to 94) : (1 to 3): (1 to 3); the lithium-supplementing layer comprises organic lithium. The composite negative electrode piece is in a layered structure, the carbon nanotubes and graphene doped in the lithium titanate composite layer have the characteristics of high conductivity and large current carrying capacity, and the lithium titanate has small particles and small transmission distance, so that the lithium ion transmission time is shortened; the lithium-supplementing layer supplies sufficient lithium ions in the charging and discharging process of the battery, and the transmission rate of the lithium ions in the battery is improved, thereby the cycling performance and the rate performance of the battery are improved, and the fast charging effect is good.

The invention belongs to the technical field of lithium ion battery negative electrode materials, and particularly discloses a Si/CNT/graphite@C composite silicon-carbon negative electrode material, which comprises an inner core and pyrolytic carbon coating the surface of the inner core, the inner core is secondary particles formed by aggregation of Si@CNT primary particles and graphite; and the Si@CNT primary particles comprise porous silicon and carbon nanotubes compounded on the surface of the porous silicon in situ. In addition, the invention also discloses a preparation method of the material. The silicon-carbon composite material prepared by the invention can be used for a fast-charging lithium ion battery, has the advantages of high rate capability, high cycling stability, long service life and controllable specific capacity, and is simple in preparation process, wide in raw material source and suitable for large-scale production.

The invention relates to a carbon composite negative electrode material and preparation method thereof and belongs to the technical field of lithium ion battery materials. The preparation method of the carbon composite negative electrode material comprises uniformly mixing organic polymer solution with graphene oxide solution, and then inletting gaseous oxidizing agent to obtain a preprocessed liquid mixture, wherein the applied organic polymer is one of phenolic resin, epoxy resin, furfural resin and acrylic resin; enabling the obtained preprocessed liquid mixture to react at 150-200 DEG C for 2-12 h, performing solid-liquid separation, carbonizing obtained solid at 750-850 DEG C to obtain a hard carbon/graphite composite material; uniformly mixing carbon nano tubes, carbon sources, lithium salt additives and water, then adding in and uniformly mixing the obtained hard carbon/graphite composite material, and performing solid-liquid separation and solid carbonization to obtain the carbon composite negative electrode material. The prepared carbon composite negative electrode material is good in electric conductivity, high in initial efficiency and tap density and excellent in fast charge performance.

The invention relates to a lithiated functional polymer for a lithium ion battery, and a preparation method and application thereof, and concretely provides a lithiated functional polymer representedby formula (I), and a preparation method thereof. The lithiated functional polymer and the lithiated perfluorosulfonic acid resin (Nafion-Li) are mixed and can be used for preparing a binder for the lithium ion battery, and the binder endows the lithium ion battery with rapid charging capacity.

The invention provides a fast-charging lithium-ion battery. An anode active material is graphite coated with soft carbon. The solute of an electrolyte is lithium hexafluorophosphate. An organic solvent contains ethylene carbonate, propylene carbonate, ethyl propionate, and polypropylene. The lithium-ion battery provided by the invention supports 2C rate cycle, has the advantages of long cycle lifeand stable performance, and can be cycled and used 900 times at the 2C/1C charge and discharge rate, and the battery capacity can still be maintained above 87%.

The invention relates to a preparation method of a high-capacity quick-charging graphite negative electrode material. The preparation method comprises the following steps: (1) crushing raw materials;(2) mixing; (3) granulating; (4) high-temperature graphitization; (5) grading; (6) carbonizing and coating; (7) treating a finished product. Compared with the prior art, the graphite negative electrode material prepared by the method has high capacity and excellent quick charging performance, solves the problem that the capacity and the quick charging performance cannot be considered in the priorart, and has very high application value in the fields of power batteries and high-end digital lithium ion batteries.

The invention provides a polymer lithium-ion battery. An anode comprises components in percentage by mass as follows: 95-96% of lithium cobalt oxide, 31-33% of NMP (N-methyl-2-pyrrolidinone), 1.5-2% of PVDF (polyvinylidene fluoride), 0.5-1% of KS-6 and 2.2-2.6% of SP, and the solid content of the anode is in a range of 67-69%. According to the polymer lithium-ion battery and a preparation method of the battery, the fast charge performance of the polymer lithium-ion battery is improved, so that the high-voltage lithium-ion battery meets charge and discharge requirements of 2C and above, the lithium-ion battery is high in energy density, high in uniform output voltage, low in self-discharge, free of the memory effect, capable of realizing fast charge and discharge, high in output power and long in service life, and the charge efficiency is up to 100%.

The invention provides a charging control method and a data line. The data line comprises a first interface connected with electronic equipment, a second interface connected with an adapter, and a transmission cable, the first interface comprises a processor, a first protocol module, a second protocol module and a third protocol module, one end of the first protocol module is electrically connected with the signal terminal of the second interface, and the other end of the first protocol module is electrically connected with the first port of the processor; one end of the second protocol moduleis electrically connected with the second port of the processor, and the other end is electrically connected with the first type signal terminal of the first interface; one end of the third protocolmodule is electrically connected with the third port of the processor, and the other end is electrically connected with the second type signal terminal of the first interface; and the processor is used for controlling the second protocol module or the third protocol module to communicate with the electronic equipment according to a first charging protocol adapted to the electronic equipment and asecond charging protocol between the second interface and the adapter. Therefore, the fast charging compatibility of the data line can be improved.

The invention provides an electrolytic solution, which comprises an organic solvent, a lithium salt and a quick charge cycle improvement additive, wherein the organic solvent comprises ethylene carbonate, dimethyl carbonate, ethyl methyl carbonate and ethyl propionate, the quick charge cycle improvement additive comprises vinylene carbonate and methylene methanedisulfonate, based on the total massof the electrolytic solution of 100%, the content of vinylene carbonate is 0.2-3%, and the content of methylene methanedisulfonate is 0.1-2%. The invention also provides a lithium ion battery containing the electrolytic solution. According to the invention, specific carbonic ester, carboxylic ester and the quick charge cycle improvement additive are screened and combined for use, so that the quick charge capacity of the lithium iron phosphate system lithium ion battery can be remarkably improved, the quick charge time is shortened, the low-temperature discharge power performance can be improved, the negative electrode graphite co-embedding phenomenon in the normal-temperature formation process of the lithium iron phosphate battery can be remarkably improved, and powder falling of the negative electrode is avoided so as to improve the cycle performance and the service life of the battery.

The invention discloses an electrolyte of a high-voltage fast-charging lithium ion battery and the lithium battery. The electrolyte comprises a non-aqueous organic solvent, an electrolyte salt and anadditive, and the mass percentages of the non-aqueous organic solvent, the electrolyte salt and the additive in the electrolyte are 65%-90%, 10%-20% and 0-15% respectively. The electrolyte can improvethe normal-temperature quick charge cycle performance, the high-temperature storage performance and the low-temperature discharge performance of the high-voltage battery at the same time. The lithiumion battery prepared by adopting the electrolyte has lower surface density, is beneficial to reducing the impedance of the lithium ion battery, is smoother in lithium ion migration, can effectively improve the rate charge-discharge performance, and obviously improves the low-temperature discharge performance at the same time; the electrolyte of the high-voltage fast-charging lithium ion battery has the relatively high charging cut-off voltage, the capacity of the lithium ion battery can be improved by about 15%, and energy density reduction caused by surface density reduction is made up; andcompared with a conventional battery, the lithium ion battery has wider tabs, so that the ohmic impedance of the lithium ion battery is effectively reduced to facilitate electron transmission.

The invention discloses a preparation method of a lithium iron phosphate composite pole piece. The preparation method comprises the following steps: firstly dissolving lithium metal into liquid nitrogen to obtain a lithium sol solution, coating the lithium sol solution onto the surface of a spumy current collector, after pressing and high temperature treatment, coating a lithium iron phosphate sizing agent on the surface, and after drying, carrying out vapor deposition on the surface to obtain a graphene layer so as to obtain the positive composite pole piece. The preparation method is simplein process, high in efficiency and easy to control, solves the defects existing in a conventional pole piece coating technology, and is low in cost and excellent in effect. According to the obtained lithium iron phosphate composite pole piece, lithium supplementation is carried out on active substances through pre-lithiation of the current collector, so that the gram volume development and rate performance of a lithium iron phosphate battery can be improved, meanwhile, the cycle performance of the lithium ion battery is improved by using the characteristics that the electric conductivity of external graphene is high and the compatibility with an electrolyte is excellent.