31results about How to "Good charge and discharge cycle" patented technology

An alkali metal, solid cathode, nonaqueous electrochemical cell capable of delivering high current pulses, rapidly recovering its open circuit voltage and having high current capacity, is described. The stated benefits are realized by the addition of at least one nitrate additive to an electrolyte comprising an alkali metal salt dissolved in a mixture of a low viscosity solvent and a high permittivity solvent. A preferred solvent mixture includes propylene carbonate, dimethoxyethane and an alkali metal nitrate, alkaline earth metal nitrate and/or an organic alkyl nitrate additive.

An alkali metal, solid cathode, nonaqueous electrochemical cell capable of delivering high current pulses, rapidly recovering its open circuit voltage and having high current capacity, is described. The stated benefits are realized by the addition of at least one phosphonate additive to an electrolyte comprising an alkali metal salt dissolved in a mixture of a low viscosity solvent and a high permittivity solvent. A preferred solvent mixture includes propylene carbonate, dimethoxyethane and an alkyl phosphonate additive.

An alkali metal, solid cathode, nonaqueous electrochemical cell capable of delivering high current pulses, rapidly recovering its open circuit voltage and having high current capacity, is described. The stated benefits are realized by the addition of at least one nitrite additive to an electrolyte comprising an alkali metal salt dissolved in a mixture of a low viscosity solvent and a high permittivity solvent. A preferred solvent mixture includes propylene carbonate, dimethoxyethane and an alkyl nitrite additive.

The present invention discloses a cathode material for lithium ion secondary battery. The cathode material is in the form of powder particles. The powder particle includes a bulk portion and a coating portion coated on the outer surface of the bulk portion. The bulk portion is formed of at least one first cathode material which is a lithium-nickel based composite oxide. The first cathode material has electrochemical activity and has high charging-discharging specific capacity at a charged voltage of 4.2V versus Li/Li⁺. The coating portion is formed of at least one second cathode material. The second cathode material has no electrochemical activity or has low charging-discharging specific capacity at a charged voltage of 4.2V versus Li/Li⁺. Lithium ion secondary battery using the cathode material has high energy density, cycling stability, security, and output power.

The invention presents a manufacturing method of an electrode for an electrochemical element for inserting and extracting a lithium ion reversibly, comprising; forming a concave portion and a convex portion at least on one side of a current collector, preparing a raw material containing a element for composing an active material, introducing a specified supply amount of the raw material and a carrier gas into a film forming device to form a plasma, and injecting the plasma of the raw material on the current collector, in which the active material is grown on the convex portion of the current collector, and a columnar body is formed by covering at least a part of respective sides of the convex portion.

A nonaqueous electrolyte secondary battery in which the decomposition of an electrolyte solution is reduced exhibits high coulombic efficiency and excellent charge and discharge cycle performance, and has high energy density. This nonaqueous electrolyte secondary battery includes a negative electrode that is formed by depositing a thin film of active material on a collector by a CVD method, sputtering, evaporation, thermal spraying, or plating, wherein the thin film of the active material can lithiate and delithiate and is divided into columns by cracks formed in the thickness direction, and the bottom of each column is adhered to the collector; a positive electrode that can lithiate and delithiate; and a nonaqueous electrolyte solution containing a lithium salt in a nonaqueous solvent. The electrolyte solution contains a compound expressed by a general formula (I).

(wherein, R¹, and R², R³ are hydrogen atoms or alkyl groups each optionally having a substituent, may be identical or different from one another, may be independent substituents, or may be bound together to form a ring)

The invention relates to high-proportion zinc borate battery electrolyte and a preparation method. The molar ratio of potassium ions or/and sodium ions in the zinc battery electrolyte to boric acid ions is 0.28-2, and the total content of an additive in the electrolyte is less than or equal to 40 g/L. According to KOH or/and NaOH 2-6.2 mol/L, H3BO3 3.1-7 mol/L, LiOH.H2O 0.1-0.5 mol/L, a base solution is formed by blending with water as a solvent, then phytic acid, benzene-m-disulfonic acid, isophthalic acid-sulfonic acid, micro-nano SiO2 or micro-nano TiO2 are added, and after stirring, standing and naturally cooling, a 400-mesh screen is used for filtering to obtain the high-proportion zinc borate battery electrolyte. The high-proportion zinc borate battery electrolyte and the preparation method provided by the invention substantially solve the problems of dendrite growth, zinc element transfer, polar plate deformation and the like of a zinc cathode in charging and discharging processes, the cycle performance is significantly improved, and reliable technical guarantee is provided for enabling zinc series alkaline batteries to become a new generation of power batteries.

The invention discloses a rod-shaped nano iron oxide electrode material, and a preparation method thereof. The preparation method comprises the steps of carrying out a hydrothermal reaction by using FeCl3.6H2O, ammonium dihydrogen phosphate and water as raw materials; and washing produced precipitate to obtain the rod-shaped nano iron oxide. The nano iron oxide is in a rod shape, with an average diameter being 60-80 nm, length being 250-300 nanometers, purity higher than 99.9% and crystal phase being alpha-Fe2O3. The rod-shaped nano iron oxide electrode material can be used as both a positive electrode active material and a negative electrode active material for a lithium ion battery. Raw materials used in the preparation method are easily available, nontoxic and pollution-free to environment. A preparation process is simple; operation is convenient; and the preparation method is suitable for large-scale production. By using the rod-shaped nano iron oxide electrode material as the positive and negative electrode active materials for the lithium ion battery, cost is low; electrochemical performance is excellent; chemical stability of the electrode material is stable; specific capacity is high; and polarization of a charge and discharge platform is small.

The present invention provides an alloy cathode for lithium battery, its manufacturing method and lithium battery. The alloy cathode for lithium battery is constituted by non-aqueous electrolyte. By filling metal lithium in a porous aluminum body, the skeleton of the porous aluminum body is further formed by using aluminum. Moreover, by forming an aluminum coating material with an aluminum layer on the surface of a core material constituted of any metal selected from the group consisting of copper, nickel and iron, the skeleton of the porous aluminum body is formed to increase the capacity and intensity and provide excellent charging and discharging cycles.

The method for preparing electrode of double electric layer capacitor includes steps: solving bonding material in solvent, dispersing powder of charcoal material and conducting material so as to prepare pulp, where volume content of solid matter is 10-25%; coating the pulp on surface of collector; pressing dried pulp to 60-150 micro to integrate and glue polarization pole and collector firmly so as to form band electrode, which is cut into two pieces of band electrode in same size; riveting leading wire to each piece of band electrode; inserting membrane in 30-80 micro to insulate electrodes; winding electrodes and membrane into core, and vacuum drying it for 8-18h. In the invention, polarization pole is composed of charcoal material, conducting material and bonding material. Advantages are: large bond strength, withstanding high voltage, and good charging and discharging periodicity.

The invention discloses a process for manufacturing a lithium sulfur battery. The process comprises the following steps: adding polyacrylonitrile resin micro powder and diatomite into a high-speed mixing stirrer according to a mass ratio of 36-39 to 64-61, adding an NMP solvent which accounts for 6-24 weight percent of the diatomite to serve as a raw material, performing pretreatment, and performing repeated dipping and high-temperature evaporation in an NMP solution of lithium salt (namely a 6-9 weight percent of NMP solution containing lithium polysulfide, lithium methylaminobutyrate, lithium perchlorate and lithium phosphate), thereby preparing a positive material; preparing all-solid-state electrolyte of the lithium sulfur battery from lithium methylaminobutyrate, lithium perchlorate and lithium phosphate; and adsorbing molten metal lithium through pores of carbon-containing diatomite at 630-660 DEG C when metal lithium and the formed carbon-containing diatomite electrode are in a vacuum electric heating furnace, thereby finishing preparation of a negative material. The all-solid-state electrolyte of the lithium sulfur battery prepared by the process has high sulfur containing capacity, high ion transport capacity and high conductive performance, and the high rate performance and high cycle performance of the lithium sulfur battery can be improved.

The invention provides a negative electrode material consisting of a lithium ion battery formed by aluminum carbon and a preparation method of the lithium ion battery. The negative electrode material is provided with a 0.2-0.3 discharge potential platform for lithium, and the discharge capacity can reach 800-1,410mAh/g. Compared with the graphite preparation process, the preparation method of the negative electrode material of the lithium ion battery has the advantages that a super-high temperature calcination stage is omitted, so that the energy is obviously saved; the required various raw materials are wide in source and low in cost; the specific capacity of the negative electrode material prepared through the process method is obviously higher than that of the graphite carbon negative electrode material; the charge and discharge cycle performance of the material is good.

An electrode group 1 which is formed by winding a positive electrode and a negative electrode into a flat shape with a separator interposed therebetween is contained in a rectangular battery case 4. The positive electrode has a tensile strength of 15 N/cm or lower when the positive electrode has a tensile extension of 1%, and the positive electrode has a tensile extension of 3% or higher when the positive electrode breaks. A gap S between a longitudinal end of the electrode group 1 and an inner surface of a short side of the rectangular battery case 4 meets the expression: S≧⅛(L×α) where L is a longitudinal length of the electrode group, and α is a tensile extension of the positive electrode when the positive electrode breaks.

The invention provides application of a LiI-KI eutectic salt in a low-temperature liquid state molten salt lithium battery, and a low-temperature liquid state molten salt lithium battery and a preparation method thereof, belonging to the field of lithium batteries. The present invention provides the application of the LiI-KI eutectic salt in the low-temperature liquid state molten salt lithium battery. The eutectic temperature of the LiI-KI eutectic salt taken as an electrolyte is 260-265 DEG C so that it is achieved that the whole liquid state molten salt lithium battery can work at an operation temperature below 300 DEG C. The experiment result shows that: The low-temperature liquid state molten salt lithium battery has good charge-discharge cycles, the open-circuit voltage is 0.76V, thedischarge platform voltage is stabilized at 0.5-0.6V, the discharge platform voltage is 0.8-0.9V, and the coulombic efficiency is basically stabilized at about 97%.

The positive pole piece comprises a current collector located on the inner layer of the positive pole piece, and a first coating, a conductive carbon cloth layer and a second coating which are sequentially and symmetrically arranged outwards from the two sides of the current collector, the first coating and the second coating comprise lithium ion active substances; the conductive carbon cloth is modified by composite slurry. The invention also provides a preparation method of the lithium battery positive pole piece and a lithium ion battery comprising the lithium battery positive pole piece. By using the conductive carbon cloth, different types of coatings can be better combined; the conductivity of the positive pole piece is improved; the tensile strength and the flexibility of the positive plate are improved; due to the constraint of the carbon cloth fibers, the active substances are not easy to fall off, more active substances and electrolyte can be accommodated, the electrolyte wettability of the active substances is better, and the capacity, the rate capability and the cycle performance of the battery are finally improved; and the safety of the battery is improved. The preparation method is simple and suitable for large-scale production.