132 results about "Lithium titanate" patented technology

The invention relates to the field of lithium ion batteries, and discloses a lithium titanate composite material and a preparation method thereof, a negative pole piece and a preparation method thereof, a lithium battery and a battery pack. The surfaces of lithium titanate particles are sequentially coated with the nitrogen-doped carbon intermediate layer and the two-dimensional MXene material outer layer, and the MXene material outer layer is formed by bridging adjacent particles through hydrogen bonds, so that a'core-shell-bridge 'three-dimensional conductive network structure is constructed, the electronic conductivity of the lithium titanate composite material is remarkably improved, the electron / ion transmission efficiency of the lithium titanate negative electrode is improved, and the lithium titanate negative electrode has a good application prospect. The lithium ion battery has excellent rate capability and cycle performance; and through collaborative optimization of the three-dimensional composite material and the electrolyte, the interface impedance is reduced, and polarization is inhibited, so that the lithium battery still keeps high capacity and long cycle stability under ultrahigh rate, and meanwhile, the problems of discontinuous conductive network and high interface impedance in the prior art are solved. And excellent rate capability and cycle performance can be achieved under ultrahigh rate.

The invention discloses a lithium titanate battery, and relates to the technical field of batteries. The battery comprises a positive electrode, a negative electrode, an electrolyte and a diaphragm, and an addition product synthesized by dimethyl fumarate and benzidine according to a specific molar ratio is added into the electrolyte as a viscosity modifier, so that the viscosity increasing trend of the electrolyte at a low temperature is effectively reduced, and the migration rate of lithium ions is improved. And the electrolyte also comprises a lithium salt, an organic solvent and an auxiliary additive, so that the low-temperature performance and the cycling stability of the battery are favorably optimized. A positive active material is one or more of lithium iron phosphate, lithium manganate, lithium cobalt oxide or nickel manganese cobalt ternary materials, a negative active material is lithium titanate, and additives such as lithium nitrate and fluoroethylene carbonate are further combined, so that the capacity retention ratio and the charge-discharge efficiency of the battery in an extreme low-temperature environment of-40 DEG C are remarkably improved. The lithium titanate battery provided by the invention has excellent low-temperature adaptability, safety and long cycle life, and is applicable to power batteries and energy storage systems in alpine regions.

The invention discloses a negative pole piece and a secondary battery prepared from the negative pole piece, and belongs to the technical field of electrochemical energy storage, the negative pole piece takes a compound of silicon-based particles and graphite particles as an active material, and meanwhile, a coating layer containing lithium titanate is arranged on the surfaces of the graphite particles, so that the ionic crosstalk phenomenon of a traditional silicon-carbon negative pole is effectively avoided, the dynamic performance is excellent, and the service life is long. And ideal stability and fast charging performance can be realized when the lithium ion battery is applied to a secondary battery.

The invention discloses a method for preparing a carbon-coated lithium titanate negative electrode material by a one-step solid phase method, and belongs to the technical field of lithium ion battery materials. The method comprises the following steps: uniformly mixing and dispersing carbon-containing lithium salt, titanium salt and metal hydride to obtain a solid mixture; and roasting the obtained solid mixture in a protective atmosphere to obtain the carbon-coated lithium titanate negative electrode material. According to the preparation method, a certain amount of metal hydride is added into the reaction raw materials, a high-temperature solid-phase method is used, and carbon in the carbon-containing lithium source is reduced by the metal hydride to serve as a carbon source, so that the carbon-coated lithium titanate negative electrode material can be directly synthesized in one step, additional carbon sources and technological processes are not needed, and the preparation technology is greatly simplified.

The invention discloses a preparation method of a modified lithium titanate battery negative electrode material. The preparation method comprises the following steps: S1, weighing zirconium chloride and benzoic acid, dissolving the zirconium chloride and benzoic acid in N, N-dimethylformamide, and mixing to obtain a first solution; s2, weighing 2, 2 '-bipyridine-5, 5'-dicarboxylic acid formic acid, dissolving the 2, 2 '-bipyridine-5, 5'-dicarboxylic acid formic acid into N, N-dimethylformamide, and mixing to obtain a second solution; s3, adding the first solution into the second solution, uniformly mixing, and reacting to obtain a third solution; s4, the third solution is subjected to suction filtration, washing and drying, and powdery UiO-bpy is obtained; s5, weighing lithium titanate powder and UiO-bpy, dissolving the weighed lithium titanate powder and UiO-bpy in ethanol to obtain a fourth solution, and drying the fourth solution to obtain an intermediate sample; and S6, heating the intermediate sample in a tubular furnace under the protection of Ar atmosphere, and cooling to obtain the battery negative electrode material UiO-bpy (LTO), thereby solving the problems of low electronic conductivity, poor rate capability and insufficient energy density of the lithium titanate (LTO) negative electrode material.

The application relates to an aluminum-doped lithium titanate-coated ternary positive electrode material and a preparation method and application thereof. The preparation method comprises the following steps: adding metal salt solution, precipitant solution and complexing agent solution into a bottom liquid in parallel flow, and performing a coprecipitation reaction under stirring conditions; after the coprecipitation reaction is completed, the temperature and stirring speed are kept unchanged, aluminum-titanium solution, precipitant solution and ammonia solution are continuously mixed in parallel flow, and a spherical hydroxide is obtained after the reaction is completed; solutes in the aluminum-titanium solution include aluminum salt, titanium salt and hydrogen peroxide; a lithium source is mixed with the spherical hydroxide, and preheating treatment and heat treatment are sequentially performed to obtain the aluminum-doped lithium titanate-coated ternary positive electrode material. The preparation method adds the aluminum-titanium solution in the coprecipitation reaction process, forms an aluminum-doped lithium titanate precursor, and thus the aluminum-doped lithium titanate-coated ternary positive electrode material is obtained through heat treatment, and the interface stability is improved.

The invention discloses a chromium-site high-entropy chromium lithium titanate material as well as a preparation method and application thereof, and belongs to the technical field of electrochemical energy storage materials. The crystal structure of the chromium-site high-entropy chromium lithium titanate material is a single spinel solid solution phase, and the chemical general formula of the chromium-site high-entropy chromium lithium titanate material is Li (Cr < 1-x-y-z-w > V < x > Fe < y > Mn < z > Al < w >) TiO4. According to the preparation method, chromium trioxide serves as an oxidizing agent, carbohydrate serves as a reducing agent, and rapid synthesis is achieved through a one-step combustion method. The process is simple and efficient, and the prepared chromium-site high-entropy chromium lithium titanate material has relatively high specific capacity and excellent cycling stability and can be applied as a lithium ion battery negative electrode material. According to the invention, the problems of limited theoretical capacity and poor rate capability of the existing chromium lithium titanate material are effectively solved, and a new way is provided for developing a high-performance lithium ion battery negative electrode material.

The invention discloses a cross-battery few-sample early prediction method and system based on physical knowledge, and the method comprises the steps: obtaining the test data of a target battery through an accelerated aging experiment, and training a general life prediction model based on an iTransform architecture through a public data set; an improved dynamic time warping algorithm is provided to realize capacity ratio alignment of degradation tracks of the target battery and the reference battery, and a characteristic difference value sequence representing systematic deviation is extracted; further constructing a deviation prediction model of multi-task learning, and synchronously optimizing three sub-tasks of feature reconstruction, physical feature prediction and health state deviation estimation through an adaptive loss weight adjustment mechanism; and finally, carrying out personalized correction on the general prediction result through a double-model fusion strategy. According to the invention, the cross-battery degradation track prediction of the lithium titanate battery of the high-speed train is completed, the prediction accuracy and generalization are improved, and a reliable technical means is provided for the health management of the battery.

The invention provides a CeO2 / RGO / LTO ternary composite material capable of being used as a negative electrode of a lithium ion battery and a preparation method and application of the CeO2 / RGO / LTO ternary composite material in the technical field of lithium battery electrode materials, and the CeO2 / RGO / LTO ternary composite material is formed by ternary compounding of cerium dioxide, reduced graphene oxide and lithium titanate. By means of step design, morphology control and interface construction, it is ensured that all components are evenly distributed, a strong synergistic effect is generated, the electrochemical performance of lithium titanate is remarkably improved, the problems that lithium titanate is low in conductivity and rapid in capacitance fading are solved, solidified lithium ions are converted into oxide with a stable structure, and the technical effect of restraining gas production is achieved. And the lithium ion battery is expected to be used for high-power and long-life lithium ion batteries, and particularly shows huge potential in the field with extremely high requirements on safety and fast charging performance.

The invention relates to the technical field of lithium ion batteries, and provides a negative plate and a lithium ion battery. The negative plate comprises a negative current collector and a negative active layer arranged on at least one side surface of the negative current collector, the negative active layer comprises a first active layer and a second active layer, and the second active layer is located between the negative current collector and the first active layer; the first active layer comprises a first active material, the first active material comprises lithium titanate, the second active layer comprises a second active material, and the second active material comprises a graphite material; after the negative plate is rolled, the porosity of the first active layer is recorded as A%, and the porosity of the second active layer is recorded as B%; a < B. The negative plate can effectively improve the rapid charging capability of the negative plate, reduce the lithium precipitation risk of the negative plate in the rapid charging process, improve the safety performance of the battery and prolong the cycle life of the battery.

The application relates to a negative pole piece, an electrochemical device and an electronic equipment, and belongs to the technical field of electrochemical energy storage. The negative pole piece comprises a negative pole current collector and a first active layer, a second active layer and a third active layer arranged on at least one surface of the negative pole current collector in sequence; the first active layer comprises a first active material, and the first active material comprises first silicon carbon and graphite; the second active layer comprises a second active material, and the second active material comprises second silicon carbon; and the third active layer comprises a third active material, and the third active material comprises hard carbon and lithium titanate. The negative pole piece provided by the application solves the problem of unstable interface of high-silicon materials, enables the battery to maintain high energy density, improves the cycle life, and inhibits lithium precipitation.

The invention discloses a silicon-carbon composite negative electrode material and a preparation method thereof, the silicon-carbon composite negative electrode material comprises a core-shell active unit, a conductive network layer and a composite coating layer, the core-shell active unit is a structure formed by loading boron-doped silicon quantum dots in hollow carbon spheres; the composite material is prepared from the following components in percentage by mass: 11 to 18 weight percent of boron-doped silicon quantum dots, 24 to 36 weight percent of hollow carbon spheres, 31 to 42 weight percent of polyimide-derived nitrogen-doped carbon nanofibers, 3 to 8 weight percent of fluorophosphate-aluminum oxide composite coating layer and 2 to 5 weight percent of lithium titanate modified montmorillonite, the mass ratio of fluorophosphate to aluminum oxide in the fluorophosphate-aluminum oxide composite coating layer is 3: 1, the particle size of the boron-doped silicon quantum dots is 2-5nm, the doping amount of the boron element is 1-3at%, and the purity is not lower than 99.95%. The core-shell structure is used for buffering silicon expansion, the nitrogen-doped carbon fiber is used for constructing a high-efficiency conductive network, the composite coating layer is used for stabilizing an interface, and the inorganic dispersed phase is used for inhibiting agglomeration, so that the specific capacity, the cycling stability and the first charge-discharge efficiency of the lithium ion battery are remarkably improved.

The invention provides a positive electrode material and a preparation method thereof, an electrochemical device and electronic equipment, and particularly relates to the technical field of battery materials. The positive electrode material comprises an inner core and a shell, wherein the inner core is selected from active substances capable of reversibly embedding and removing lithium ions; the surface of the inner core is coated with the shell, the material of the shell comprises Li4Ti5-xMxO12, x is more than 0 and less than or equal to 0.3, and M comprises one or more of V, Ta and Nb. The transition metal element doped lithium titanate shell is constructed on the surface of the common positive electrode active material, so that the cycle performance of the positive electrode active material can be effectively improved.

The invention relates to composite ceramic, a preparation method thereof, aluminum segregation purification equipment and an aluminum segregation purification method. The preparation raw materials of the composite ceramic comprise silicon nitride, lithium titanate and silicon carbide. The composite ceramic is high in mechanical property, high in thermal conductivity and good in chemical stability and can be used as a crystallization rod in aluminum segregation and purification equipment for segregation, crystallization and purification of aluminum, and the crystallization rod made of the composite ceramic has longer service life compared with a graphite crystallization rod, so that the replacement frequency of the crystallization rod can be reduced, and the production cost is reduced. And the cost of aluminum segregation extraction is reduced.

The application discloses a lithium titanate battery power test method and belongs to the technical field of battery performance test. The method solves the problem that the existing battery power density test method cannot be applied to the continuous pulse power discharge working condition. The application comprises the following steps: based on the HPPC method, adjusting the pulse discharge test time to 18s, standing for 40s-5min, and subtracting the 18s discharge cutoff voltage from the voltage after standing; alternately charging or discharging the battery in the test, discharging for 10s, charging to the capacity consistent with that before discharging, recording the voltage, and calculating the power capacity; calculating the power change curve at different discharge times; the internal resistance obtained by the test presents a trend of first increasing and then decreasing with the increase of the discharge time, which is affected by the cell polarization and temperature rise; the JEVS method is used to obtain the maximum charging or discharging current; and the power verification of the final result is performed. The application is used for the battery power density test under the continuous pulse power discharge working condition.

The invention discloses a preparation method of a carbon-coated lithium titanate composite silicon negative electrode material, which comprises the following steps: mixing raw materials, carrying out two-stage high-temperature calcination, converting a lithium source and a titanium source into lithium titanate, carrying out disproportionation reaction to convert silicon monoxide into silicon simple substance silicon dioxide, removing silicon dioxide by acid etching, and carrying out carbon coating by chemical vapor deposition to obtain the carbon-coated lithium titanate composite silicon negative electrode material. A final product is obtained. The porous lithium titanate has the characteristics of zero volume expansion, high safety, long service life and low energy density, and the nano silicon has the characteristics of high specific capacity, large volume expansion and poor cycle performance, so that the comprehensive performance of high capacity, long cycle and high safety is finally realized by utilizing the synergistic effect of the porous lithium titanate and the nano silicon; compared with a silane chemical vapor deposition silicon process, the process is safe and low in cost; compared with a process of respectively preparing porous lithium titanate and nano silicon and then mixing, the preparation method disclosed by the invention has the advantages that the problem that nano silicon is easy to agglomerate is avoided, and the electrochemical performance of a finished product is effectively improved.

The utility model provides a lithium titanate slurry preparation device which comprises a treatment tank, the inner side wall of the treatment tank is rotatably connected with a dispersion box, the inner side wall of the dispersion box is rotatably provided with a first dispersion disc and a second dispersion disc respectively, the top end of the treatment tank is slidably connected with two connecting frames, and one ends of the two connecting frames are fixedly provided with a top frame; the slurry dispersing device has the beneficial effects that the slurry in the dispersing box is in a rolling annular flow during rotation and generates a strong vortex through the rotation of the arranged dispersing box for treating the slurry and the non-rotation of the first dispersing disc in the dispersing box and the reverse rotation of the second dispersing disc; under the action of centrifugal force, slurry is extruded out of meshes of the first dispersion disc and the second dispersion disc to form a turbulent flow area, the slurry and particles are strongly sheared and impacted, an upper beam and a lower beam are formed outside the area, and the slurry is fully circulated and turned over, so that the dispersion effect is achieved, and the slurry treatment efficiency of the whole preparation device is improved.

The invention relates to the field of lithium ion batteries, and discloses low-water-absorption lithium titanate, a preparation method thereof, a negative pole piece, a lithium battery and electric equipment. According to the invention, the specific water-resistant polymer protective layer is added on the surface of the lithium titanate material, so that the adsorption to moisture is reduced, the requirement on the humidity of the environment is reduced, and the lithium titanate battery manufacturing process environment is favorably achieved. The prepared lithium titanate pole piece is coated with the protective film, so that the side reaction between the electrolyte and the pole piece after the battery is manufactured in the later period can be reduced, and the gas production problem of the lithium titanate battery can be relieved. The polymer coated protective film on the surface of the lithium titanate material can form a protective layer similar to an SEI (solid electrolyte interface) film in the subsequent charging and discharging process of the lithium titanate battery, so that the stability of the lithium titanate battery is improved. According to the application of the low-water-absorption lithium titanate, the humidity requirement of the lithium titanate battery manufacturing process can be reduced, the lithium titanate battery manufacturing process achievement rate can be improved, the lithium titanate manufacturing process cost and energy consumption can be reduced, and large-scale manufacturing is easy.

The utility model relates to a kind of titanium capacitor batteries, including shell, electric core, positive pole guide needle, negative pole guide needle, electric core is installed in shell interior, positive pole guide needle, negative pole guide needle is same direction and protrudes from the top of electric core, the electric core is wound by positive pole sheet, diaphragm, negative pole sheet, the positive pole sheet is composed of positive pole aluminium foil layer and positive pole coating layer, positive pole coating layer is coated in the surface of positive pole aluminium foil layer, the negative pole sheet of the utility model titanium capacitor battery is composed of negative pole aluminium foil layer and lithium titanate coating layer, lithium titanate coating layer is coated in the surface of negative pole aluminium foil layer, using lithium titanate coating has the characteristics of high safety, high stability, wide temperature range, long life and green environmental protection, titanium capacitor battery can be applicable to energy storage power supply, instrument and apparatus, UPS power supply and other fields, can replace super farad capacitor and lithium battery module in special industrial field.

The application discloses a high-density lithium titanate fine-grain ceramic rapid sintering method based on electric pulse, which comprises the following steps: lithium titanate powder is prepared by a solid phase method; lithium titanate ceramic green bodies are obtained by tabletting the lithium titanate powder; the lithium titanate ceramic green bodies are placed in the middle of two pieces of graphite felt; and the rapid sintering is carried out under the action of a high-frequency direct-current pulse power, so that the high-density lithium titanate fine-grain ceramic is obtained. The high-frequency pulse direct-current is applied to both ends of the graphite felt, so that the Joule heat is generated in the graphite felt, the lithium titanate ceramic green bodies sandwiched in the middle of the graphite felt are rapidly sintered and densified, the lithium ceramic grain growth and lithium evaporation under long-time sintering are overcome, the density and grain size of the lithium titanate ceramic can be controlled by adjusting the pulse voltage and time; due to the high heating rate and short sintering time, the prepared fine-grain high-density lithium titanate ceramic has high compressive strength and bending strength, and the comprehensive mechanical properties of the lithium titanate ceramic during service are ensured to a certain extent.

The present disclosure provides a negative electrode layer having low resistance. The negative electrode layer is a negative electrode layer for a full-solid battery, and contains lithium titanate, a sulfide solid electrolyte, and a rubber-based binder. The proportion (A / B) of the adsorption amount (A) of the rubber-based binder adsorbed on the lithium titanate with respect to the total content (B) of the rubber-based binder contained in the negative electrode layer is 1.35% or less.

The invention discloses an intelligent early warning system and method for a 5T detection station overhaul coming vehicle, and solves the problems of human negligence, communication interruption and insufficient response of'human staring 'protection. The system comprises a detection terminal (2 kilometers, double magnetic steel / radar, wide-temperature lithium titanate battery + solar energy and IP67 protection), an alarm terminal (machine room sound-light alarm and differential mode) and a cloud platform (monitoring, log and remote configuration). The core functions are as follows: reverse coming vehicle locking (direction judgment to prevent false alarm), multi-level early warning (preparation in 2 kilometers and immediate lane descending in 1 kilometer) and self-inspection diagnosis; 4G / 5G / LoRa transmission is adopted, the reliability is ensured by dual-computer hot standby, the civil defense is replaced by technical defense, the intrinsic safety is improved, and the probability of maintenance accidents is reduced.

The application discloses a carbon-coated metal-doped lithium titanate composite material and a preparation and application thereof. The carbon-coated metal-doped lithium titanate composite material is prepared by using a proper amount of metal doping and carbon coating, so that the gas production problem of the lithium titanate material is improved, and the electronic conductivity of the lithium titanate material is enhanced, and the long service life of the lithium titanate material is fully utilized. In the application, a lithium ion battery is also provided, and the negative electrode material of the lithium ion battery is the carbon-coated metal-doped lithium titanate composite material. The lithium ion battery has excellent cycle stability, and the capacity retention rate can be kept above 90% after 8000 cycles of charging and discharging at a 3C rate.

The utility model provides a spray drying device of a lithium titanate electrode material, which relates to the technical field of spray dryers, and comprises a drying tank body, an atomizing nozzle and a hot air pipe, an air curtain mechanism is arranged right below the hot air pipe, and the air curtain mechanism comprises a mounting shell, a driving assembly, a centrifugal sliding block, a closed ring, an abutting rod and an air curtain nozzle, an annular cavity is formed in the mounting shell, a driving assembly is rotationally connected into the mounting shell, a plurality of driving blades are connected to the upper side of the driving assembly, a centrifugal guide rod is connected to the lower side of the driving assembly, a centrifugal sliding block is connected to the centrifugal guide rod in a sliding mode, and an abutting rod is connected to the upper side of the closed ring. According to the utility model, the driving blade drives the air curtain mechanism to neatly rotate in the mounting shell through the hot air pipe, so that hot air forms a hot air curtain through the air curtain nozzle, atomized particles are prevented from being attached to the inner wall of the drying tank body, and the uniformity of the dried particles is ensured.

The invention discloses a preparation method of a lithium titanate material and a lithium titanate battery containing the lithium titanate material, and the preparation method comprises the following steps: (1) mixing lithium titanyl oxalate and ammonium titanyl oxalate in water, and carrying out spray drying granulation to obtain ammonium titanyl oxalate double salt; and (2) sintering the obtained lithium titanyl ammonium oxalate double salt to obtain the lithium titanate material. The lithium titanate material is prepared by sintering the compound containing both titanium and lithium in molecules, and titanium atoms and lithium atoms are uniformly mixed in the molecular-level size, so that the lithium titanate material obtained after high-temperature decomposition has more ideal distribution uniformity of lithium and titanium elements; moreover, after the decomposition reaction, except the lithium titanate, other byproducts are gas, and high-purity lithium titanate can be obtained.

The invention provides a coated lithium manganese iron phosphate positive electrode material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion battery positive electrode materials. According to the invention, lithium manganese iron phosphate, a lithium source, a titanium source and a solvent are mixed, and the surface of lithium manganese iron phosphate is successfully coated with lithium titanate by combining hydrothermal reaction and calcination treatment; through surface coating modification, the problems of low ionic conductivity and manganese dissolution of the lithium manganese iron phosphate material are solved at the same time, so that the positive electrode material with high rate performance, excellent cycle stability and high-temperature performance is obtained.

The application discloses a preparation method of low-dielectric-loss high Q × f value lithium titanate-based microwave dielectric ceramic material and a product thereof.The application takes Li2CO3, TiO2, Sc2O3 and Nb2O5 as raw materials, substitutes Ti in Li2TiO3 with (Sc 1 / 2Nb 1 / 2 ) 4+ , forms a lithium titanate-based microwave dielectric ceramic material with a chemical formula of Li2Ti 4+ (Sc 1‑x Nb 1 / 2 ) 1 / 2 x O3, effectively adjusts the phase structure of the microwave dielectric ceramic, optimizes the temperature frequency characteristics and dielectric loss, and obtains excellent comprehensive microwave dielectric performance with moderate dielectric constant, super high Q × f value and near-zero resonance frequency temperature coefficient, so that the lithium titanate-based microwave dielectric ceramic material has great application potential in the fields of next-generation mobile communication and satellite communication.

The invention discloses a composite lithium manganate positive electrode material, a preparation method and a lithium manganate battery, the composite lithium manganate positive electrode material comprises lithium manganate and lithium-containing phosphate, the surface of the lithium manganate is coated with the lithium-containing phosphate, the chemical formula of the lithium-containing phosphate is LiMPO4, and M is one or more of Fe, Co, Ni, V, Ti and Mo, and the preparation method comprises the following steps: firstly, mixing and sintering a manganese source, a lithium source and a metal oxide in a solvent to obtain a mixture; crushing and sieving to obtain lithium manganate powder; the lithium manganate positive electrode material is obtained by dispersing lithium manganate powder into a suspension A, preparing a solution B from a lithium source, an M source and phosphate, carrying out a co-precipitation reaction, filtering, washing and drying to obtain a precursor, and finally carrying out heat treatment in an inert atmosphere, the lithium manganate positive electrode material is used as a positive electrode and lithium titanate is used as a negative electrode of the lithium manganate battery, and the problem of dissolution of a manganese element is solved.

Provided is a control system for an all-solid-state lithium-ion battery that improves safety. An all-solid-state lithium-ion battery control system provided in a vehicle includes: an all-solid-state lithium-ion battery connected to a drive motor of the vehicle; and a control unit that controls input and output of current to the all-solid-state lithium-ion battery in such a manner that a first prescribed SOC of the all-solid-state lithium-ion battery is not exceeded during normal operation, the all-solid-state lithium-ion battery including lithium titanate in a negative electrode, the control unit accumulating the number of seconds or the current value for which the charge amount of the all-solid-state lithium-ion battery exceeds 100% of the SOC due to overcurrent, calculating a limit SOC reduction amount based on the accumulated value, calculating a second prescribed SOC based on the limit SOC reduction amount, and controlling the all-solid-state lithium-ion battery based on the second prescribed SOC.

The application discloses a kind of carbon-coated lithium ion sieve and preparation method thereof, comprising: lithium titanate is dispersed in bituminous solution, and mixed liquor is obtained;The mixed liquor is dried under vacuum condition, and precursor is obtained;The precursor is calcined, and carbon-coated lithium titanate composite material is obtained, after the carbon-coated lithium titanate composite material is pickled, centrifuged and dried, carbon-coated lithium ion sieve is obtained.Industrial waste garbage extract bituminous and lithium titanate are used as raw materials, carbon-coated lithium titanate composite material is prepared by simple high-temperature calcination, and carbon-coated lithium ion sieve is obtained by acid washing and separation. The outer layer of the ion sieve is composed of a porous carbon layer, which can provide a large number of active sites, promote the diffusion of lithium-containing brine, and facilitate lithium ion adsorption, thereby increasing the adsorption capacity. At the same time, the carbon layer protection can enhance the stability of lithium ion sieve, especially the acid resistance, reduce the solution loss, and facilitate the multiple cycle use of lithium ion sieve.