53results about How to "Full use of capacity" patented technology

The invention discloses a preparing method for a silicon-carbon composite negative electrode material for a lithium ion battery. The preparing method includes the following steps that 1, flake graphite, a polymer solution and nanometer silicon dispersion liquid are evenly mixed, dried and carbonized in a protective atmosphere; 2, pitch and spherical graphite are mixed, ground, placed in an inert protective atmosphere, and subjected to heat treatment to obtain modified spherical graphite; 3, a binder, the modified spherical graphite and the mixed material obtained after carbonization in the step 1 are added into solvent, dispersed evenly and dried to obtain a precursor material; 4, the precursor material is carbonized to obtain the silicon-carbon composite negative electrode material. In the process of the preparing method, it is unnecessary to add special dispersant, nanometer silicon is evenly dispersed in the graphite by means of some ionic groups existing in the polymer solution and high viscosity, the polymer solution has certain stability, and the possibility of nanometer silicon aggregation in the drying process is reduced.

The invention provides a high-concentration electrolyte for a lithium ion battery. The electrolyte comprises lithium salt, a non-aqueous solvent and a wetting agent; the concentration of the lithium salt is higher than 2 mol/L; and the wetting agent is selected from fluoro-ether compounds. The wetting agent is added in the electrolyte, so that the viscosity of the electrolyte is reduced and the wettability is improved while the high concentration is ensured; the dynamic characteristic of the electrochemical reaction on the electrode/electrolyte interface is good, and the reaction polarizationis small. Therefore, the wetting agent is added in the electrolyte so that the safety of the electrolyte can be improved, the protection of an aluminum current collector is realized, the viscosity ofthe high-concentration electrolyte is reduced, and the problem of poor wettability of the electrolyte is solved; and the electrochemical stable voltage of the electrolyte exceeds 4.5V, so the electrolyte is suitable for a high-voltage positive electrode material; the capacity of the battery is fully played; and the energy density of the battery is improved.

The invention discloses an electrolyte for a lithium-ion power battery, which comprises lithium salts, organic solvents and additives, wherein the lithium salts comprise at least one of LiODFB, LiPF6, LiClO4, LiBF4, LiAsF6, LiCF3SO3, LiN(SO2CF3)2 and LiBOB; the invention also discloses a preparation of the electrolyte, which comprises the following steps: mixing the organic solvents after impurities and water are removed; (2) adding the lithium salts in the mixed organic solvents, evenly stirring till the solution is clear and has no sediments, and allowing the solution to stand for at least half an hour to obtain mixed solution; (3) adding the additives into the mixed solution, evenly stirring, and then allowing the mixed solution to stand to obtain the required electrolyte. The invention improves the cycle performance of the battery at the high temperature, prevents gas explosion caused by electrolyte decomposition, can remarkably promote the long-life function of the volume conservation rate of the lithium-ion power battery at the high temperature, and has simple preparation method and easy industrialization production simultaneously.

The invention discloses safe non-aqueous electrolyte for a battery. The electrolyte comprises a lithium salt, an organic solvent and an additive, wherein the organic solvent comprises a cyclic compound and chain carbonate; the cyclic compound comprises propylene carbonate and a cyclic phosphonitrile compound. The electrolyte takes a flame-retardant compound as a solvent, has high safety performance, low-temperature performance and high-temperature cycle performance and is safe electrolyte which can be used in a wide temperature range. Meanwhile, due to a matched synergistic effect of the solvent and the additive, the battery has high electrochemical performance, the capacity of a lithium ion battery using the electrolyte can be fully exerted, and the battery has excellent safety performance, high-temperature resistance, low-temperature performance and long cycle life.

The invention relates to a novel control method for improving lithium ion soft-package laminated battery diaphragm fold. The problem that the battery performance is influenced due to the fold of the soft-package laminated lithium ion battery diaphragm is solved. The control method comprises the following steps: laying down a battery after liquid injection, thereby ensuring that the electrolyte sufficiently infiltrates a pole piece; and then performing rolling on the lay-down battery, and controlling the pressure and speed of the rolling in the rolling process; pre-charging the battery after the rolling is ended; and performing secondary rolling on the completely pre-charged battery, further shaping the diaphragm, and releasing the gas to finish the secondary package. The contacting interface between a positive/negative pole piece and the diaphragm is better by comparing the lithium ion soft-package laminated battery prepared based on the control method with the battery without performing the rolling shaping, the dead lithium existing in the fold area caused by the diaphragm fold is avoided, thus the capacity of the positive/negative material is sufficiently played, and the batteryperformance is improved.

The invention provides a negative electrode of a secondary battery and a preparation method thereof, and the secondary battery. The negative electrode of the secondary battery is composed of a currentcollector and a lithium film and/or a lithium composite film located on one or both sides of the current collector, wherein the thickness of the lithium film or the lithium composite film is no lessthan 1 [mu]m and less than 40 [mu]m. The preparation method for the negative electrode of the secondary battery comprises a step of forming the lithium film and/or lithium composite film on one side or both sides of a current collector by vacuum plating. Films with different thicknesses can be plated directed at different battery systems so as to give full play to the capacity of metallic lithiumor a lithium composite material.

The invention discloses a clinical medicine entity identification method and a clinical test knowledge mining method, and the clinical test knowledge mining method comprises the steps of clinical medicine entity identification, clinical test argument mining and clinical test result reasoning. According to the method, on the basis of a BERT pre-model, further pre-training of abstract literatures of RCT is added, a text model in the clinical test field is obtained, entity category information is fused into model prediction, and the effect of a clinical test entity mining task is improved; in the information extraction stage, while a PICO entity is recognized, IC and an evidence sentence containing O are matched, then the logic relation of the IC and the O is judged, and the mask language model architecture of BERT is fully utilized for prediction.

The invention discloses an in-situ self-assembled nano-flower-like cobalt disulfide/rGO composite material and a preparation method and an application thereof. The in-situ self-assembled nano-flower-like cobalt disulfide/rGO composite material is obtained through steps that by adding GO solution to mixed solution of soluble cobalt salt solution and vulcanizing agent solution, and after stirring, ultrasonically, the obtained GO mixed solution is reacted in a stainless steel kettle at 150-280 DEG C, after cooling with the furnace, and the solid is obtained by freezing-drying treatment after suction filtration. The composite material has a nano-flower-like three-dimensional microstructure, nanoflowers are composed of single crystals of cobalt disulfide and grow in situ on a two-dimensional rGO nano sheet substrate, the substrate can effectively accommodate the volume effect of cobalt disulfide during charging and discharging and has good electrical conductivity, moreover, the composite material has excellent charging and discharging cycle performance and rate capability and can be applied in the field of lithium ion battery cathode materials.

The invention discloses a negative active material for a lithium-ion battery. A chemical formula of the negative active material is FexSiOy/C, wherein x is smaller than or equal to 2 and greater than or equal to 2/3; and y is smaller than or equal to 4 and greater than or equal to 3. In addition, the invention further discloses a preparation method of the negative active material for the lithium-ion battery and the lithium-ion battery employing the negative active material. Compared with the prior art, the negative active material FexSiOy/C for the lithium-ion battery disclosed by invention has the advantages of high specific capacity, high cycling stability, low cost and the like; the preparation method is simple, convenient and feasible; the prepared FexSiOy/C is high in purity and excellent in electrochemical property; and the lithium-ion battery has the advantages of high energy density, long service lifetime, high safety and the like.

The present invention is one method and apparatus to load and tamp coal in horizontal coking furnace. An improved coal bogie is used, which has movable connection, rather than fixed connection, to coal baffle, and two sets of replaceable coal baffle and coal supporting board and two damping platforms for distributing coal and damping coal are used, so as to perform coal loading and coal distributing and damping synchronously and circularly. The present invention has shortened operation period and raised apparatus utilization.

The invention discloses a forming method of a lithium ion battery, which is characterized by comprising the following steps of: (1) after fluid injection of the battery, under the condition that the temperature is between -10 and 35 DEG C, performing partial formation on the battery through low-current low-voltage section charge-discharge circulation; (2) performing high-current medium-voltage section fast charge-discharge circulation on the battery until the internal temperature of the battery reaches and keeps between 30 and 45 DEG C, and then performing local formation on the battery through low-current high-voltage section charge-discharge circulation; and (3) performing deep formation on the lithium ion battery through high-current deep charge-discharge circulation. All the steps arecarried out by using the same equipment at the same environmental temperature. After the formation by the method, the cathode surface SEI film of the battery is thinner, more compact and firmer, the stability of an electrode surface is effectively enhanced, an anode active material is fully used, the energy of the battery is high, the capacitive properties, the cycle performance, the rate capability and the safety performance of the battery are also improved, and simultaneously, the process is effectively simplified, the productivity is improved, and the equipment investment and the maintenance cost are reduced.

The invention provides a negative electrode plate which comprises a current collector and a coating arranged on the surface of the current collector, the coating comprises at least two active layers and a porous diffusion layer arranged between the two adjacent active layers, the porosity of the porous diffusion layer is larger than that of the adjacent active layers, and the thickness of the porous diffusion layer is smaller than that of the adjacent active layer. According to the negative electrode plate with the structure, the porous diffusion layer with large porosity and thin thickness is introduced between the active coatings of the negative electrode plate, so that the overall energy density of the negative electrode plate is not influenced, the transmission of lithium ions in the coatings is facilitated, the high-rate charge-discharge performance of the battery can be improved, and the capacity of the active material in the negative electrode plate can be fully exerted, so that the energy density of the battery is further improved.

The invention relates to a difunctional electrolyte applicable to an embedded and conversion type lithium battery, a preparation method, and a lithium battery comprising the electrolyte. The electrolyte is formed by dispersing a multi-component ether type ionic liquid into a fluoro-ether type solvent; the positive ions of the multi-component ether type ionic liquid are a lithium ion chelate; freeof free-state ether or carbonic ester, a secondary reaction with graphite or polysulfide ions can be prevented effectively, so that the electrolyte can be applicable to an embedded type electrode material and a conversion type electrode material; by introducing fluoro-ether, the electrolyte viscosity is lowered, and meanwhile, electrochemical stability and thermal stability of the electrolyte arenot influenced; the initial charging efficiency can reach 80% or above, and after 100 cycles, the specific capacity has little loss; in addition, the electrolyte has high flame retardant effect, and high temperature performance and safety of the electrolyte are improved, so that joint use of the conversion type electrode material and the embedded type electrode material can be realized; and consequently, the battery energy density is improved, and battery cost is lowered.