272 results about "Lithium ion intercalation" patented technology

A high kinetics rate electrochemical cell in which at least one of the electrodes is composed of a mesostructural electroactive material comprising nanoparticles forming a three-dimensional framework structure of mesoporous texture having a bicontinuous junction of large specific surface area with the electrolyte. A low temperature method of preparation of the electrodes employs a high-speed deposition of the electrically active material in the form of a thin film. The application of said electrodes in high power lithium ion insertion batteries, photovoltaic cells, supercapacitors and fast electrochromic devices is disclosed.

A lithium rechargeable battery with an electrode assembly comprising at least two positive electrode plates with electrode tabs coupled to each positive electrode plate, at least two negative electrode plates with electrode tabs coupled to each negative electrode plate, separators interposed between each positive and negative electrode pair, and the electrode assembly being formed by winding a layered structure of the electrode plates and separators into a jelly roll shape. The electrode plates are partially coated with electrode active material capable of reversible lithium ion intercalation and de-intercalation. The tabs coupled to the positive electrode plates are coupled with a first terminal of the battery, and the tabs coupled to the negative electrode plates are coupled with a second terminal of the battery.

The present invention relates to a new-type high-performance mixed aquo system lithium ion cell. Said invention is characterized by that its positive electrode is made of intercalation compound electrode material containing lithium ion, and its negative electrode is made of the electrode materials of active carbon, mesopore carbon or carbon nano tube, etc, with high specific surface, and its electrolyte adopts aquo system electrolyte containing lithium ion. Said invention has longer circulation life, it is more than ten times that of general secondary cell, and has the features of high power, safety, low cost and free from environmental pollution.

A nonaqueous system electrochemical mixed capacitor using lithium cell material as positive electrode is prepared as combining ion embedding ¿C deembedding mechanism of lithium cell with double electric layer mechanism in a power accumulator, using LiMn2 ¿C x MxO4 material as positive electrode and using active carbon with high specific surface area as negative electrode to form asymmetric electrochemical capacitor.

The invention relates to a high-density spherical ferric phosphate and a preparation method thereof, and preparation materials are mainly used for preparing ferrous phosphate lithium which is the anode material of a lithium ion battery. The preparation method takes an iron source and an additive as raw materials, and the raw materials are dissolved by vaal water to be made into a mixed solution A; the preparation method takes phosphate and a neutralizing agent as raw materials, and the raw materials are dissolved by the vaal water to be made into a mixed solution B. The solution A and the solution B are mixed and reacted, preparation materials are washed and parched, and the high-density spherical ferric phosphate the average grain diameter of which is 1.5-5micron, the tap density is not less than 0.95g/cm<3>, the grains are dispersed and the sizes are symmetrical is obtained. The ferrous phosphate lithium prepared by the high-density spherical ferric phosphate has perfect crystal structure, lithium ion intercalation/de-intercalation channel is normal, and the discharge capacity can reach 140mAh/g under the condition of 1C. The preparation method has simple process and is easy to technologize, and the ferrous phosphate lithium synthetized by the ferric phosphate has good crystallinity and crystal structure and can increase the electrochemical properties of the ferrous phosphate lithium.

Disclosed is a cathode active material providing a cell performance that is not adversely affected by overdischarge, and a lithium secondary cell using the same. More particularly, the cathode active material for a lithium secondary cell comprises a lithium-transition metal oxide capable of lithium ion intercalation/deintercalation, wherein the cathode active material further comprises a lithium manganese oxide having a layered structure represented by the following formula 1 as an additive:[formula 1] LiM_xMn_1-x0₂ wherein, x is a number satisfying 0.05 x<0.5, and M is at least one metal selected from the group consisting of Cr, Al, Ni, Mn and Co. The lithium manganese oxide of formula 1 used as an additive for a cathode active material of a lithium secondary cell provides lithium ions in such an amount as to compensate for an irreversible lithium ion-consuming reaction at an anode, or more, thereby providing a lithium secondary cell which is low in capacity loss by over-discharge.

The invention discloses a high-specific-capacity silicon-based negative electrode composite binder and a preparation method for a negative plate containing the same, belonging to the field of binders for batteries. The high-specific-capacity silicon-based negative electrode composite binder comprises 5 to 50 wt% of carboxymethylcellulose sodium, 5 to 30 wt% of polyacrylic acid and 20 to 90 wt% of styrene-butadiene rubber. The preparation method for the negative plate comprises the following steps: binder preparation; addition of a conductive agent; addition of a main material; sieving; coating; high temperature polymerization; rolling; and punching. The composite binder provided by the invention can overcome the technical problem of short cycle life of a battery caused by immense volume changes of a conventional silicon-based negative electrode material during intercalation and deintercalation of lithium ions.

The invention relates to a high-specific-energy/high-specific-power type super battery, consisting of a positive electrode, a negative electrode, a diaphragm between the positive electrode and the negative electrode, and organic electrolyte, wherein the positive electrode is formed by parallel connection of two types of electrode pieces, i.e. an electrode piece which adopts a lithium-ion-embedded compound in a lithium ion battery as an active material and an electrode piece of a porous carbon material in a double electric layer super capacitor, the negative electrode adopts a negative electrode carbon material of the lithium ion battery, and the electrolyte is of an organic solvent containing lithium ion salt electrolyte. The high-specific-energy/high-specific-power type super battery has high energy density and power density simultaneously, wherein the specific energy can be up to 50-110wh/kg, and the power density can be up to 450-8000w/kg; and the high-specific-energy/high-specific-power type super battery can be widely applied in the fields such as electric automobiles, electric tools, solar energy storage, wind energy storage, portable household appliances and the like.

The invention relates to a capacitor battery of a high-specific-energy organic system, consisting of a positive electrode, a negative electrode, a diaphragm between the positive electrode and the negative electrode, and organic electrolyte, wherein the positive electrode adopts the mixture of a lithium-ion-embedded compound and a porous carbon material, the negative electrode is hard carbon, and the electrolyte adopts electrolyte of an organic solvent containing lithium ions. The super capacitor battery prepared by the invention has the characteristics of high energy density (up to 20-90Wh/Kg) and high power density (larger than 4500W/Kg), can be widely applied in the fields such as electric automobiles, electric tools, solar energy storage, wind energy storage, portable household appliances and the like.

The invention discloses a preparation method for a molybdenum disulfide nanosheet with a reactive group-containing surface. The preparation method comprises the following steps: adding one part by weight of molybdenum disulfide, 2-5 parts by weight of n-butyllithium and 10-20 parts by weight of n-hexane into a hydrothermal reaction kettle, heating at 50-150DEG C for 0.5-12 hours, cooling to room temperature, performing centrifugal separation and n-hexane washing for five times, drying at 50DEG C for 12 hours so as to obtain molybdenum disulfide powder with lithium ion intercalation, adding 1 part by weight of molybdenum disulfide powder with lithium ion intercalation, 0.05-10 parts by weight of sulihydryl reagents with reactive groups, and 100-1000 parts by weight of water into a flask for performing ultrasonic treatment for one minute to five hours under 50-100 watt, to obtain molybdenum disulfide nanosheet with the reactive group-containing surface. The method is easily available, mild to react, simple to operate, and small in environmental pollution; the prepared nanosheet can be further functionalized, thus having good application prospects.

The invention discloses a preparing method of porous monocrystal IT MoS2 nanosheet. The method comprises the steps of 1, preparing 2H crystal form MoS2 nanosheet using hydrothermal method; 2, conducting stripping of multi-layered 2H crystal form MoS2 nanosheet with ultrasonic wave and assisting with a lithium-ion intercalation method. The 1T MoS2 nanosheet can be directly used for electro-catalysis hydrogen production, and compared with MoS2 with other structures, electro-catalysis hydrogen production property can get fast improvement, porous structure provides more edges for the catalysis, therefore can expose more active sites, which is beneficial to electro-catalysis hydrogen production; single-layered structure enables larger specific surface area of the catalyst, can provide more reaction active sites. Compared with a multi-layered structure, a single-layered structure reduces electric transmission resistance between layer and layer, is beneficial to transmission and transfer of electricity, thus accelerating velocity of electro-catalysis hydrogen production.

The invention relates to the preparation technology of cathode materials for rechargeable secondary lithium-ion batteries and provides a method of preparing the cathode materials for high-capacity lithium-ion batteries. The lithium-ion battery utilizes the techniques of the in-situ carbothermic reduction reaction and the in-situ chemical reaction ball milling to prepare the uniformly-dispersed metal oxide/carbon composite cathode materials. The prepared composite cathode materials can remarkably increase the capacity of the lithium-ion batteries and have excellent cycle performance. The composite cathode materials prepared by the method make full use of high-capacity metal oxides, additionally, the metal oxides, in the form of small granules, are uniformly dispersed on the surface of the carbon-based matrix with high interface bonding strength, so that the volume change caused by the insertion and the extraction of lithium ions during the recharging process is well attenuated by the carbon-based matrix and the cycle performance is also kept excellent.

The invention discloses a preparation method of a silicon carbon negative pole composite material. The method comprises the following steps: dispersing silicon powder and a carbon source in a certain proportion in deionized water, stirring for some time, transferring into a teflon reaction kettle, coating the carbon precursor on the silicon powder surface by a hydrothermal process, and calcining in an inert atmosphere; dispersing the calcined material in a mixed solution a, dispersing at high speed, and drying; and carrying out etching treatment on the dried material by using an etching solution, drying the etched material to obtain the final silicon carbon negative pole composite material. The method effectively increases the lithium ion intercalation positions, improves the bulk effect of silicon, and enhances the electrochemical stability. The material has the advantages of low preparation cost and simple and controllable technique, and is suitable for large-scale industrial production.

The invention relates to a novel aqueous lithium ion flow battery with high performances and low cost. A lithium ion intercalation-deintercalation mechanism and a flow battery metal ion deposition-dissolution mechanism are optically combined in an energy storage device. A positive electrode adopts a lithium ion intercalatable-deintercalatable solid oxide material, a negative electrode adopts a deposition type metal electrode material deposited-dissolved on an inert electrode, an electrolyte is an aqueous electrolyte containing lithium ions and capable of depositing and dissolving metal ions, and the separation of positive electrode and the negative electrode by a diaphragm is not needed. In the charge and discharge process, the electrolyte is promoted by a liquid pump to go through a pipeline and continuously circularly flow between a storage tank and a battery main body. The aqueous lithium ion flow battery has the characteristics of long cycle life, high energy efficiency, safety, low cost, less maintenance, environmental protection, high utilization rate and energy density of active substances, and large specific capacity, and is especially suitable for large scale power storage of off-grid renewable energy power generation and distributed power supply.

The invention relates to a lithium ion supplementing technology of lithium ion batteries. The technology includes firstly, preparing a silicon carbon negative pole piece; then preparing a Li-naphthalene solution; soaking the prepared silicon carbon negative pole piece in the Li-naphthalene solution for 2 hours; and performing leaching. The silicon carbon negative pole piece is embedded with a certain amount of lithium ion before a battery is prepared, and irreversible capacity losses due to an SEI film which is formed by embedding lithium ions into a negative pole for the first time can be eliminated. Under the same charging and discharging depth, volume deformation amplitude reduction of silicon based negative materials during a lithium ion embedding and extracting process after the lithium ion supplementing can help improve the cyclic stability of silicon carbon negative pole based lithium ion batteries. Through experimental confirmation, charging and discharging efficiency of the silicon carbon negative pole for the first time can be significantly enhanced, and the cyclic stability can be improved as well.

This invention provides a laminated transition metal composite oxide of Li ionic cell positive material by distributing binary or triple transition metals on a board uniformly. The positive material is prepared by applying laminated cathode ion material water talc fore-body method, first of all, applying the common deposition method to prepare the M-N water talc then to carryout the dehydroxy step by lamination boards to turn those with positive charges to those with negative, at the same time, the interlamination cathode ions get out and Li ions are inserted into them to get a laminated positive material with the advantage of getting composite oxide electrode material in lamination structure and uniform distribution of CoNi and Mn transition metal on the board.

The invention specifically relates to a negative plate of a lithium ion battery, a diaphragm and manufacturing methods thereof. The negative plate of the lithium ion battery comprises a negative substrate. At least a surface of the negative substrate is uniformly coated with an active material layer which is characterized in that the surface of at least an active material layer is coated with lithium metal. When the negative plate is applied to a lithium ion battery, lithium metal is subjected to a dissolution reaction due to local battery theory. Simultaneously, a SEI film is generated on the surface of the active material layer of the negative plate, and a few lithium ions are embedded into the active material. Thus, capacity of the lithium ion battery is raised so as to overcome the problem that mismatching between capacity of the manufactured negative pole and capacity of a positive pole is caused and performance of the positive pole cannot be fully performed due to high irreversible capacity of materials such as Sn, Si and the like. Capacity of the lithium ion battery is raised greatly. Therefore, the negative plate can be adopted to raise capacity of the lithium ion battery.

The current methods for preparing single-layer molybdenum disulfide include micromechanical exfoliation, liquid-phase ultrasonic exfoliation, lithium ion intercalation, laser method, annealing layer-by-layer thinning method, and chemical vapor deposition method. Molybdenum disulfide prepared by chemical vapor deposition method has large size, uniform surface and controllable layer number. When molybdenum disulfide is prepared by chemical vapor deposition, molybdenum disulfide is easy to nucleate and grow on defects such as impurities or scratches on the substrate. If the substrate is not cleaned cleanly, molybdenum disulfide will easily grow into multi-layer or solid materials. To clean the substrate thoroughly, toxic and dangerous drugs such as acetone and piranha solution will be used. These drugs are toxic to the human body, so the operation process is potentially dangerous. Based on the above problems, the object of the present invention is to provide a simplified chemical vapor deposition method for the preparation of single-layer molybdenum disulfide, which can produce high-quality single-layer molybdenum disulfide without using toxic hazards such as acetone and piranha solution. Drugs are used to clean the substrate, avoiding potential danger.

This invention belongs to capacitor technique field, which in detail is a new electrochemistry super capacitor. The capacitor combines the ion imbed to off imbed mechanism of the lithium ion battery and the double electric layers mechanism into one energy storage device, wherein its negative electrode adopts lithium ion imbed compound material with low imbed level and the positive electrode adopts active carbon or hole carbon to form an anisomerous super capacitor. Its negative electrode materials adopts nanometer sharp crystal rock Li#-[8x/(x+4)]Ti#-[8/(x+4)]O#-[4] or one or multiple other metal elements mixed compound.

The invention relates to a high-rate lithium-ion battery and a method for preparing a composite carbon cathode material for a super-capacitor battery. The method comprises the following steps: coating a surface-nano-crystallized core with a porous carbon coat provided with macro-pore/meso-pore/micro-pore three-dimensional layer pores; doping metal particles on the surface of the coat; and carrying out low-potential treatment, wherein the three steps are sequentially achieved by a template-based method, a combined method comprising dipping, chemical plating and physical mixing, and an electrochemical method of lithium pre-doping respectively. The process of the invention has the advantages of simple method and convenient operation; the prepared material has a core-coat structure and doped metallic elements, and meanwhile, the material has good performance in double-layer electric energy storage and lithium-ion intercalation and de-intercalation energy storage and effectively improves the high-rate performance and power density of the lithium-ion battery; the material meets the requirements of super-capacitor batteries in both the lithium-ion energy storage and double-layer electric energy storage of the cathode material; accordingly, the material can be used as the cathode of a high-performance lithium-ion battery; and the material has good performance in high-rate charging/discharging, so the material has a good prospect for industrialization.

The invention discloses a nano electrode structure for a silicon-based three-dimensional micro-battery. The nano electrode structure comprises a silicon nano-pillar array and a material layer compounded on the outer layers of silicon nano-pillars. The production method comprises the following steps of self-assembling hexagonal close-packed monolayer polystyrene nanospheres on the cleaned and activated silicon substrate by using a spin coating method; taking the monolayer polystyrene nanospheres as a mask, and utilizing the mask and an inductive coupled plasma etching technology to etch; sequentially using an organic solvent and a standard silicon chip cleaning process to remove the mask and byproducts generated in the etching process; and finally, utilizing the thin film deposition and material growth technology to obtain the bottle-shaped silicon-based composite nano-pillar array three-dimensional electrode structure. According to the structure, on the one hand, a lithium ion barrier layer can be deposited on the outer layers of silicon nano-pillars, and thus a structure support of the three-dimensional micro-battery that a silicon substrate does not participate in intercalation/deintercalation of lithium ions is formed, and on the other hand, the formed silicon or silicon composite material can be used as an anode material of a lithium ion battery to participate in electrode reaction.

The invention discloses a negative plate, comprising a negative current collector and a negative electrode coating coated on the negative current collector, wherein the negative electrode coating comprises a negative active material, a conductive agent and a bonding agent, and the negative active material comprises carbon coated lithium titanate particles which have a spinel structure. According to the invention, the negative active material of the negative plate comprises carbon coated lithium titanate, there is no change of the crystal form of the spinel lithium titanate in the process of intercalation/deintercalation of lithium ions, the crystal lattice constant has small change, and the volume change is less than 1%; when the negative plate is applied in a lithium ion battery, compared with a traditional lithium ion battery which comprises a graphite material as a negative active material, the battery cycle performance is better. The invention further provides a lithium ion battery which utilizes the negative plate and a preparation method thereof.

The invention discloses a preparing method of carbon material or nanometer silicon composite material and material through composite sintering method in the electrochemical technological domain, which is characterized the following: possessing stable structure with even particle diameter less than 1 mm; avoiding agglomeration among large amount of nanometer particles due to stronger action of surface to surface; displaying high reversible capacity and excellent circulating property.

Synthesis of series nanometer lithium manganese oxide for lithium ion battery is carried out by taking mangano-manganic oxide or basic manganese oxide as precursor, hydrothermal reacting with excessive lithium hydrate in water or alcohol solution of autoclave, inserting lithium ion into lattice of manganese oxide, separating, washing and drying to obtain final product. It is simple and safe, has lower energy consumption, uniform granularity, better electrical performance and no environmental pollution.

The invention discloses a method for preparing a ZIF-67 polyhedron to obtain a velvet hollow polyhedron Co9S8 <at> MoS2. In ZIF-67 derivatize to alpha-CoS hollow polyhedron is then grown on that inn surface of the CoS hollow polyhedron to form a two-dimensional lamellar material MoS2, Co9S8 <at> MoS2, which form that hollow polyhedron structure of velvet shell. The hollow polyhedron Co9S8 <at> MoS2 with N-doped amorphous carbon can improve the conductivity of the composites, and the hollow structure can buffer the volume effect in the charge-discharge process. The Co9S8 polyhedron itself has ahigh theoretical specific capacity, and the two-dimensional layered material MoS2 grows in situ on Alpha-CoS forms MoS2 velvet shell on the inner and outer surfaces of the polyhedron, which further increases the lithium storage capacity and enhances the rate performance. When Co9S8 <at> MoS2 is used as the negative electrode material of lithium ion battery, Co9S8 and MoS2 exert synergistic effect, and the surface MoS2 increases the lithium storage capacity and the buffer volume changes. The hollow Co_9S_8 skeleton further buffers the volume effect of lithium ion intercalation. This material is a promising lithium ion anode material.