531 results about "Aluminium-ion battery" patented technology

The invention discloses a preparing method of an artificial graphite cathode material used in lithium ion battery; it aims at resolving problems that cathode material possesses higher discharging capacity, coulomb efficiency and long circle life. The preparing method includes following steps: coal or petroleum needle-type coke is comminuted, and hot processed for 1-48 hours at 800deg.C-3000deg.C, comparing with current technique, the cathode material adopts needle-type coke to be comminuted, and hot process, defect that high crystallinity graphite material can not be circled in electrolyte system of PC solvent stably, and it can discharge in big times, it can be used in lithium ion drive battery, and craft is easy, and it fits for industrialization production.

The invention discloses a lithium ion battery conductive additive and a preparation method thereof, and solves the technical problems of improving the conductive performance and cycle life of anode and cathode materials of a lithium ion battery. The lithium ion battery conductive additive is graphene, is black powder with grain size distribution of between 10 nanometers and 100 microns, and is a carbonaceous material consisting of single or 1,000 parallel or approximately parallel graphene lamellae. The preparation method comprises oxidization and stripping reduction. Compared with the prior art, the additive has higher electric conductivity; when the additive is applied to the electrode material, the performance of the conventional battery can be greatly improved only by a little amount; the material serving as the conductive additive has good conductive performance, is easy for dispersion, and can effectively enhance the conductive performance and the magnification charging and discharging performance of the electrode material of the lithium ion battery and prolong the cycle life; and the preparation method has low requirements for raw materials and equipment, is easy to control the process, and is suitable for industrialized production.

This invention relates to a method for preparing olivine-type phosphate-series lithium ion battery anode material. The method comprises: mixing one or more of ferrous salt solution, cobalt salt solution and manganese salt solution with oxalic acid or oxalate (precipitating agent) aqueous solution to obtain composite oxalate precursor, uniformly mixing with lithium source and phosphorus source by ball milling, and reacting in inert or weak-reductive atmosphere to obtain olivine-type phosphate-series lithium ion battery anode material. The method utilizes co-precipitation method for metal ion doping, and realizes molecular level uniform mixing among different ions. The obtained olivine-type phosphate-series lithium ion battery anode material has uniform chemical and physical compositions. The average particle size can be controlled within 0.3-10 mu.m. The first charge and discharge cycle specific capacity can reach 150 mAh/g at 0.1 C rate and room temperature. The livine-type phosphate-series lithium ion battery anode material has such advantages as high cycle performance and high charge/discharge performance.

The invention discloses an artificial graphite negative electrode material for a lithium ion battery and a preparation method thereof. The preparation method for the artificial graphite negative electrode material comprises the following steps: preparing powder, adding a binder and/or a crystal nucleus-induced growth additive, kneading, carrying out compression molding, thermally roasting, carrying out nodulizing shaping and/or fusing, carrying out ultrahigh-temperature graphitization, screening, removing magnetism and screening. The preparation method disclosed by the invention is simple to operate, easy to control, lower in production cost and suitable for industrial production. The prepared artificial graphite negative electrode material has high graphitization degree, high compactness, high capacity, high coulombic efficiency, high conductivity and high multiplying power, and can be used for the lithium ion battery.

The invention discloses an anode material and a cathode material for a lithium ion battery and a modifying method thereof, solving the technical problem, i.e. how to improve the electrochemical performance of an electrode material. The surface of either anode material or the cathode material for the lithium ion battery is coated with a layer of carbon nanotubes or carbon nanofibers in a net structure, the coating layer of the cathode material has the thickness of 1-400 nm, and the coating amount of the anode material is 0.5-5 percent of the electrode material. The modifying method of the anode material and the cathode material for the lithium ion battery comprises the following steps of: forming a mixture of the electrode material, a catalyst and the carbon nanotubes or carbon nanofibers;adding water to stir the mixture into mash; and heating and reacting. Compared with the prior art, by coating a layer of carbon nanotubes or carbon nanofibers on the surface, the invention improves the material performance in all aspects and the electrochemical performance of the electrode material, achieves the aim of avoiding adding an additional conductive agent when applying the material and simplifies the manufacture process of the pole pieces of the lithium ion battery.

The invention relates to the field of lithium ion batteries, and discloses a lithium-ion battery diaphragm, a lithium ion battery and a preparation method thereof. The lithium-ion battery diaphragm comprises a porous base membrane and a heat-resistant layer which covers at least one side surface of the porous base membrane; the heat-resistant layer contains a high-temperature polymer and a nano-material, wherein the high-temperature polymer and the nano-material are in the weight ratio of (99 to 1) to (3 to 7); the heat-resistant layer is of a porous structure, the average pore diameter is 10to 1,000 nm, and the porosity is 30 to 60 percent. The lithium-ion battery diaphragm provided by the invention has high ionic conductivity, and also has high heat resistance and high mechanical strength at a high temperature.

The invention relates to an aluminium ion battery and a preparation method thereof and belongs to the field of aluminium ion batteries and preparation thereof. The aluminium ion battery comprises a positive electrode, a negative electrode and an aluminium ion electrolyte, wherein the positive electrode is made of transition metal oxide; the negative electrode is made of high purity aluminium; the battery comprises a diaphragm material when the aluminium ion electrolyte is in a liquid state. Since abundant aluminium elements are stored, the cost for the ion battery is greatly reduced; the safety performance is improved; the transition metal oxide is applicable to hypervalent ion batteries due to relative stability under the variable valence states and different valence states. The ion liquid serves as the electrolyte for the hypervalent ion battery, so that aluminium ion is high in conductivity, good in heat stability, broad in electrochemical window and high in chemical stability and almost incapable of reacting with the positive electrode materials, the negative electrode materials, a current collector, a binder and a diaphragm in a battery system and capable of maintaining the liquid state in a board temperature range. The aluminium ion battery can be applied to various fields, such as electronic industries, communication industries and electric vehicles and the like.

The invention relates to a titanium phosphate lithium material used for the cathode of a lithium ion battery and a preparation method thereof. The crystal structure of the titanium phosphate lithium material is an NASICON structure, and the composition is LixTi2(PO4)3, wherein x is 1 to 1.05. The preparation method of the material comprises the following steps: firstly, evenly mixing lithium-contained, titanium-contained and phosphorus-contained inorganic matter raw materials, and carrying out one-step roasting in an air atmosphere with the temperature of 800 to 1000 DEG C to prepare high-purity titanium phosphate lithium; then mixing the prepared titanium phosphate lithium with organic matter of glucose and the like in a certain proportion; milling and evenly mixing by a planet ball mill; then roasting in an inert atmosphere to obtain the carbon-cladding titanium phosphate lithium material. The preparation method is simple and has low cost, and the obtained titanium phosphate lithium cathode material has high purity, complete structure, high electrical conductivity and good electrochemical properties.

The invention discloses a modified high nickel ternary positive electrode material. The surface of a high nickel ternary positive electrode material is coated with a coating layer containing a fast ion conductor. The fast ion conductor has the chemical general formula of Li3x1La2/3-x1Ma1TiNz1O3, Li2+2x2Zn1-x2GeO4 or LiM'2(PO4)3, wherein M represents Ba<2+> and/or Sr<2+>, N represents Al<3+> and/orZr<4+>, x1 is greater than or equal to 0.04 and less than or equal to 0.167, a1 is greater than or equal to 0 and less than or equal to 1, z1 is greater than or equal to 0 and less than or equal to 1, x2 is greater than -0.3 and less than 0.8, and M' represents one or more of Zr, Ti, Ge and Hf. Compared with the existing positive electrode material, the modified high nickel ternary positive electrode material is provided with the coating layer containing the fast ion conductor and the coating layer can react with residual lithium on the surface of the material to reduce residual lithium on the surface of the material and inhibit side reactions of the residual lithium and the electrolyte so that material surface stability and cycle performances are improved. The modified high nickel ternary positive electrode material has good lithium ion deintercalation ability, improves the first discharge capacity of the material and first coulombic efficiency and has a good application prospect. The invention also discloses a preparation method of the modified high nickel ternary positive electrode material and a lithium ion battery.

The invention discloses an electrolyte additive, a high-voltage electrolyte and a lithium ion battery containing the electrolyte additive. The high-voltage electrolyte is prepared by adding the electrolyte additive into the conventional electrolyte; the conventional electrolyte comprises a non-aqueous organic solvent and lithium salt, wherein the content of the non-aqueous organic solvent is 80-85 percent of the total mass; the mass of the electrolyte additive is 0.01-10 percent of the total mass; and the electrolyte additive is maleic anhydride C4H2O3 or one of derivatives thereof and has the structure formula as shown in the abstract. According to the high-voltage electrolyte, a stable interfacial film can be formed on the surfaces of a positive electrode and a negative electrode, the reaction activity on the electrode surface is inhibited, oxidative decomposition of the electrolyte is reduced, and gas swelling is effectively inhibited, so that the safety performance and the cycle performance of the lithium ion battery under normal pressure and high voltage are improved and the service life of the lithium ion battery under normal pressure and high voltage is prolonged. The electrolyte is simple in preparation process and is suitable for industrial production.

The invention relates to a preparation method of a lithium vanadium phosphate (Li3V2(PO4)3)/graphene composite material for a positive electrode of a lithium ion battery. The method comprises the steps that firstly, a mixed precursor solution is prepared; pretreatment of spray drying is conducted and a precursor is obtained; and then the lithium vanadium phosphate positive electrode material of the lithium ion battery is prepared through a calcination reaction under an inert atmosphere condition. Compared with the prior art, the preparation method has the advantages that the combination mode of the Li3V2(PO4)3 and the graphene, the contents of carbon and the graphene, and the particle size of the material are effectively controlled, thereby improving the stability and the electrical conductive performance of the material.

The invention discloses a morphological control method of a metal oxide/carbon (MOx/C) composite material for the negative electrode of a lithium ion battery. The method comprises the following steps: adding metal ions and monodentate ligands with different proportions into a solvent, stirring for a period of time, then adding a multidentate ligand, and heating in a reaction kettle for a period of time to obtain the metal organic framework (MOF) precursor materials with different morphologies; and calcining the precursors in an inert gas atmosphere for a period of time to obtain the MOx/C composite materials with different morphologies. The composite materials disclosed by the invention have relatively high specific surface areas and rich pore structures, and have excellent rate performance and cycling stability as the negative electrode materials of the lithium ion battery. The morphological control method disclosed by the invention is simple to operate, easy to realize large-scale application, and can also be extended to other fields that focus on material morphology control.

The invention provides a modified lithium manganese oxide electrode material for a lithium ion secondary battery, which is characterized in that the general formula is Li(4-x)A(x+y)Mn(5-y)O12.epsilonBOz. The synthesizing method comprises the following steps: weighing and mixing raw materials evenly in accordance with the stoichiometric ratio in the general formula and then adding the mixture of the raw materials to a container; adding an oxidizing solution, evening mixing and reacting for over 10 minutes, and then taking the materials out, washing and drying; and then carrying out high-temperature calcination and reaction for 1-30 hours at a temperature of 400-1200 DEG C under an oxygen-contained atmosphere, and cooling to obtain the modified lithium manganese oxide electrode material. Compared with an existing electrode material and a synthesizing technology, the modified lithium manganese oxide electrode material produced in the production process can improve the crystalline characteristic and the purity of products as well as the specific capacity, the initial coulomb efficiency, the cyclical stability and other characteristics in electrochemical property; and the modified lithium manganese oxide electrode material improves performances of the lithium ion battery, promotes the wider applications of the lithium ion battery and has significant economic meanings and practical value.

The invention relates to an electrolyte, a lithium ion battery comprising the same and a preparation method of the lithium ion battery. The electrolyte comprises a lithium salt, an organic solvent, an addition agent A and an addition agent B. The addition agent A is one or more of phosphate ester compounds and boric acid ester compounds. The addition agent B is one or more of sulfurous ester compounds and sultone compounds. The electrolyte is applied in the lithium ion battery, and then the cycling performance, the high-temperature storage performance and the power performance of the lithium ion battery can be improved. When the lithium ion battery is prepared, some electrolyte E1 is added before being formed, and the rest of the electrolyte E2 is added before the capacity is tested. By selecting the preparation method, the lithium ion battery can have the excellent cycling performance, high-temperature storage performance and power performance.

Multilayer structures with alternating graphene and Si thin films were constructed by a repeated process of filtering liquid-phase exfoliated grapheme film and subsequent coating of amorphous Si film using plasma-enhanced chemical vapor deposition (PECVD) method. The multilayer-structure composite films, fabricated on copper current collectors, can be directly used as anodes for rechargeable lithium-ion batteries (LIBs) without the addition of polymer binders or conductive additives. Fabricated coin-type half cells based on the new anode materials easily achieved a capacity almost four times higher than the theoretical value of graphite even after 30 cycles. These cells also demonstrated improved capacity retention and enhanced rate capability during charge/discharge processes compared to those of pure Si film-based anodes.

The invention relates to a phosphate-based electrolyte and a lithium ion battery. The electrolyte is mainly characterized by taking at least one cyclic phosphate and at least one chain phosphate as solvent components. The advantages of the phosphate-based electrolyte are that: the two kinds of phosphates both have a flame retardation characteristic, and the cyclic phosphate can be subjected to ring-opening polymerisation under abuse conditions of high temperature, over charge or the like, and the electrolyte is gelated, the internal resistance of a battery increases, and therefore the battery security is improved. The cyclic phosphate can form into membranes on an anode surface and a cathode surface of the lithium ion battery, and improves the compatibility between the electrolyte, and the anode and the cathode; the usage of the chain phosphate helps to reduce the electrolyte viscosity and improve the electrolyte conductivity, and good multiplying power performance and low temperature performance are provided in the corresponding battery system. The security of the lithium ion battery can be improved substantially by using the electrolyte.

A method for obtaining electrochemical model parameters of a lithium ion battery relates to the field of new energy research. The present invention is to solve the problems that the existing mechanismmodel parameters need to be acquired by means of an electrochemical measurement method or an intelligent algorithm, and the ability to acquire parameters quickly and without loss is not provided. Themethod comprises steps of 1, establishing an electrochemical simplification mechanism model for the lithium ion battery; 2, applying a parameter identification condition to the lithium ion battery tocharge and discharge the lithium ion battery, and obtaining voltage data and current data of the lithium ion battery under charge and discharge conditions; and 3, according to the electrochemical simplification mechanism model of the lithium ion battery and the voltage data and current data of the lithium ion battery under charge and discharge conditions, obtaining electrochemical model parameters of the lithium ion battery. The method is used to obtain electrochemical model parameters of lithium ion batteries.

The invention relates to a lithium ion battery waterborne positive electrode composite collector, a positive plate, manufacturing methods for the lithium ion battery waterborne positive electrode composite collector and the positive plate, and the lithium ion battery, and belongs to the technical field of lithium ion batteries. The lithium ion battery waterborne positive electrode composite collector is prepared by the following steps of adding a binder into a solvent to uniformly mix to obtain a binder solution, wherein the mass ratio of the binder to the solvent is 1:10-30; adding a conductive agent to the binder solution, uniformly mixing, grinding and emulsifying to obtain a conducive slurry, wherein the mass ratio of the conductive agent to the binder is 1-99:1; and coating the surface of the positive electrode collector with the prepared conductive slurry, and drying to obtain the lithium ion battery waterborne positive electrode composite collector. The problem of low flexibility of the waterborne positive plate is greatly solved by the lithium ion battery waterborne positive electrode composite collector; and meanwhile, the adhesive force of the coating layer is improved, the internal resistance of the battery is reduced, and the high-rate discharge performance and the cycle performance of the battery are improved.

The invention discloses a lithium ion battery formation sectional charging method. The lithium ion battery formation sectional charging method is carried out at room temperature and comprises four stages, namely a constant current charging stage I, a constant current charging stage II, a constant current charging stage III and a constant voltage charging stage. According to the lithium ion battery formation sectional charging method, a small current charging stage is adopted for activating an electrode material, reducing impedance of positive and negative electrodes and improving battery capacity, and a large current charging stage is used for improving formation charging efficiency. The lithium ion battery formation sectional charging method has the beneficial effects that the formation efficiency of a lithium ion battery can be improved, that the good formation of an SEI (solid electrolyte interface) membrane can be guaranteed, and that the good cycle performance of the lithium ion battery can be maintained; meanwhile, formation charging time can be effectively shortened while the good performance of the lithium ion battery is maintained to be constant, and thus the production efficiency is improved.