99results about How to "Improve overcharge resistance" patented technology

This invention relates to a lithium-sulfur buttery electrolyte and chargeable lithium-sulfur buttery, wherein the electrolyte uses one or more than one quaternary amine salt ion liquid as solvent to inhibit the soluble capability of the middle product polysulfide from electrode reaction in electrolyte, which improves the capacity and circle life of Li-S battery. Li-S battery used this electrolyte has many advantages, such as the reversible capacity is large, the circle capability is well, and it has nice safety capability and a bright application future.

The invention relates to manganese department positive electrode material of a lithium secondary battery, which can combine with electrolyte solution or solid electrolyte, and negative electrode active material to form lithium secondary battery. Its characteristics are: the positive electrode material of lithium secondary battery is LiMn1-x-y NixMyO2(x is not less than 0.2 and not larger than 0.8, y is not less than 0 and not larger than 0.6, and x+y is not larger than 1.), M is chosen from Li, Mg, Co, Ni, Fe, Al, Cr. The manufacturing method for manganese department positive electrode material of the lithium secondary battery, includes preparation of usher containing Mn; decorate to the covering of usher particle containing Mn; mix with lithium salt and prepare particle; sintering and other steps. By decoration of the surface of particle to usher 6 of positive electrode containing Mn or active material itself, state of material or apparent condition of material can be changed and its capacity of powerful charge and discharge, cycle performance and thermal stability can be raised. The invention has notable advantages including low cost, capacity of powerful charge and discharge, super-long cycle performance, excellent safety, super-long circulation property and resistance to overcharge .

The invention relates to a micron single crystal modified normal spinel lithium manganate LiMn(2-z)MzO4 and a preparation method thereof, wherein z is more than or equal to 0 and is less than or equal to 0.5. The preparation method is characterized in that firstly, composite oxides of manganese and modified metal M are used as raw materials of preparation, the composite oxides are porous aggregates consisting of nanometer microcrystal, the average size of the aggregates is between 5 micrometers and 20 micrometers, and the specific surface of the composite oxides powder is more than 20m/g (measured by a BET method); secondly, the prepared modified lithium manganate material basically consists of micro regular octahedron single crystal, the average size of the single crystal granular is between 5 micrometers and 20 micrometers, the specific surface is lower and is less than 0.5m/g. In addition, the product has excellent physical and electrochemical properties, such as ultralow specific surface, reasonable granular size distribution, better electrode processing property and ultralong circulation service life, excellent multiplying power property, remarkable high-low temperature cycling and storage properties, and best safety, and can be widely used as the materials of an anode of the lithium ion battery, especially a power lithium ion battery.

The invention discloses a preparation method of a lithium ion battery anode material. The method is characterized in that the outer surface of the existing lithium ion battery anode material is sequentially coated with an aluminum oxide layer and a carbon layer, wherein the coating condition is liquid-phase coating, in the coating process of the aluminum oxide, the addition sequence of the existing lithium ion battery anode material and aluminum salt is adjusted, and the coating substance organic aluminum salt is added under the continuously stirring condition, so that a hydrolytic product is uniformly adsorbed onto the surface of an active substance. The carbon coating is carried out through a spray drying and rapid sintering way in the inert gas atmosphere, so that the problems that the metal is reduced due to the high-temperature carbon coating and the organic carbon source is difficultly carbonized in low temperature can be avoided. The invention also discloses a lithium ion battery anode material prepared through the method. The energy density and power density of the battery can be remarkably improved, and the cycling performance, the capacity retention rate and the safety performance of the battery can be improved.

The invention belongs to a high-safety lithium nickel cobalt manganate cylindrical high-rate battery and a preparation method thereof. The battery comprises a nickel-plated steel case and a lithium ion battery cell in the nickel-plated steel case, wherein an upper insulating strip and a lower insulating strip are respectively arranged at the upper part and the lower part of the lithium ion battery cell; a cap is arranged on a mechanical seal port in the upper part of the nickel-plated steel case; the lithium ion battery cell comprises a positive plate, a first diaphragm, a negative plate and a second diaphragm which are superposed in sequence and reeled; by setting the positions of a positive pole leading-out end and a negative pole leading-out end and setting the sticking position and manner of a high-temperature adhesive tape, the battery production efficiency can be effectively improved and defects in a processing procedure can be reduced; as the first diaphragm and the second diaphragm are used in combination and electrolytes containing special additives are selected and used to coordinate with one another, the destructive safety performance test of the battery is 100% qualified. The battery has the advantages that the assembly is simple, the yield is high, the cycle performance is good, and the safety performance of resistance to overcharge, short circuit, needling, squeezing, impact and the like can be improved.

The invention relates to a solid solution for a lithium ion battery with a positive spinel structure having the formula LiMn2-xMxO4.yLiAlO2 (0<=0.1, 0<y<0.5), wherein, M is one or more selected from Mg, Ca, Co, Ni, Cr and Zn. The solid solution can be used as an anode material for the lithium ion battery, characterized in that: the lithium-containing solid solution has good processability of electrodes, super long cycle lifetime, excellent multiplying performance, extraordinary high and low temperature cycle and storage performance and great safety performance, and can be widely used as anode materials for lithium ion batteries, especially for dynamic lithium ion batteries.

A method for preparing positive electrode material of ternary composite Li ion cell includes mixing soluble compound of Ni and Mn as well as Co to be transition metal soluble, filling certain amount of ammonia water in reactor then adding transition metal solution into reactor by ejecting gun and pumping mixed liquid of ammonia and sodium hydroxide into reactor by precipitation then wet-mixing it with Li compound, sintering mixture of presoma and Li compound with high temperature under oxygen atmosphere then grinding sintered material to obtain positive electrode material.

The invention discloses a preparation method of a nano-composite membrane electrode material. The preparation method comprises the following steps: (1) dissolving a precursor of manganese, a precursor of titanium and a precursor of carbon in an organic solvent to prepare a spinning solution; (2) performing electrostatic spinning on the spinning solution to obtain a nano-fiber material; and (3) after performing pre-oxidation treatment on the nano-fiber material, performing carbonization treatment in an inert atmosphere to obtain the required nano-composite membrane electrode material. The MnOx/TiO2/C nano-fiber composite membrane electrode material prepared by the preparation method is excellent in performance, nano particles of MnO2 and TiO2 are distributed on carbon nanofibers with good electric conductivity and porous structure in a mutually interlaced manner, and crystal structures of MnO2 and TiO2 nano particles affect each other and the MnO2 and TiO2 nano particles coordinately distribute on the carbon nanofiber membrane , so that the intercalation and deintercalation efficiency of lithium is improved, and the cycle performance and rate performance of the electrode material are improved; and moreover, the porous structure of the carbon nano-fibers provides a passage for the intercalation and deintercalation of lithium ions, and the electric conductivity is improved.

A composite lithium ion battery anode material coated with orthosilicate and the preparation method thereof are disclosed, belonging to battery electrode material field and the preparation method field. The formula of orthosilicate is MSiO4(M is Mn,LiCo, LiFe) and the orthosilicate contains 0.1%-5.0% the mass of the electrode material. The preparation method of the composite anode material includes the following steps: firstly, preparing orthosilicate sol; adding the target anode material into the orthosilicate sol and mix the two thoroughly; drying and baking the mixture; in this way, coated and modified anode material can be obtained. The anode material is greatly improved in over-charging resistance and thermal stability while not reduced in specific capacity. Furthermore, the preparation method is simple in technique and convenient to operate and can effectively avoid the dissolution of the lithium ions and is easy to realize in large scale industrial production.

The invention discloses a high-capacity long-service-life double-bag nickel-hydrogen battery. A battery pole plate consists of a bag type nickel positive electrode plate, a bag type hydrogen storage alloy negative electrode pole plate and a multilayer composite membrane or separation electrode grid positioned between the bag type nickel positive electrode plate and the bag type hydrogen storage alloy negative electrode pole plate; an electrode material of the bag type nickel positive electrode plate is prepared from positive electrode active materials, conducting agents, additives and bondingagents; an electrode material of the bag type hydrogen storage alloy negative electrode pole plate is prepared from hydrogen storing alloy powder, conducting agents and bonding agents; electrolyte isa KOH alkaline solution containing additives in a rich liquid state. Through positive and negative electrode formula optimization, electrolyte formula optimization, electrode preparation method process improvement and separation plate optimization selection, the electrode structure of the positive and negative electrodes is greatly optimized; the utilization rate of positive and negative electrodeactive substances is improved; the internal resistance of the battery is optimized and reduced; the chalking resistant and anticorrosion capability of negative electrode hydrogen storage alloy is improved; the low-temperature performance of the battery is improved; the cycle service life of the battery is prolonged.

The invention discloses a battery and a cathode composition thereof. The composition comprises the following components in percentage by weight: 80.8-82.6 percent of lead powder, 0.13-0.17 percent of carbon black, 0.06-0.1 percent of sodium lignosulfonate, 0.39-0.43 percent of humic acid, 0.1-0.13 percent of oxygen resistant agent, 0.32-0.5 percent of barium sulfate, 0.03-0.05 percent of short fiber, 7.1-8.0 percent of sulfuric acid and 8.9-9.9 percent of pure water. In the invention, the battery has high over-charge and over-discharge resistance and prolonged service life, and reserves simultaneously the advantages of high capacity, good large-current discharge performance, good low-temperature characteristic, and the like.

The invention provides a nickel-based material. The nickel-based material comprises a core material represented by the FORMULA (I) and a Li<4>SiO<4> coating layer coated on the surface of the core material. The invention further provides a preparation method of the nickel-based material. The preparation method of the nickel-based material comprises the following steps of: mixing methyl silane with an organic solvent, then, adjusting the pH value, and reacting to obtain coating liquid; mixing the coating liquid with a precursor material represented by the FORMULA (II) to stir, so that an initial nickel-based material is obtained; and, performing high-temperature solid-phase reaction after mixing the initial nickel-based material with lithium salt, so that the nickel-based material is obtained. Li<4>SiO<4> is coated on the surface of the core nickel-based material; the obtained nickel-based material is used as the cathode material; and thus, a lithium ion battery has better cycle performance and rate capability.

The method consists of procedures of solid phase synthesis and burning in high temperature including following steps. (1) According to lithium: cobalt, manganese, nickel=1-1.1 : 1 (atomic ratio), and cobalt : manganese : nickel=1:1:1, polyacrylamide and neodymia are added into even mixed sources of cobalt, manganese, nickel. The above admixture is mixed round evenly till it becoming colloid. (2) Baking drys the said colloid for 30 hr. under 150 deg.C, and ball milling is carried out till powder is passed through sieve. (3) With being preburned for 10 hr. at 300-450 deg.C, the said powder is cooled to room temperature. (4) Product is obtained after fine ball milling the preburned powder, passing through sieve, burning and sifting the powder by 300 screen mesh again. Comparing with prior art, the invented method adds polyacrylamide and neodymia as well as preburning step so as to possess features of high specific capacity, good cycle performance and pollution-free.

The invention belongs to the technical field of a lithium ion battery, and relates to a preparation method of a lithium nickel manganese cobalt positive electrode material, a lithium ion battery positive electrode material and a lithium ion battery. The preparation method of the lithium nickel manganese cobalt positive electrode material, provided by the invention, comprises the following steps of preparing a ternary material precursor aqueous solution with weight concentration being 45-60%; preparing a lithium source compound aqueous solution with weight concentration being 20-30%; sending the ternary material precursor aqueous solution and the lithium source compound aqueous solution to an agitator by a pump, and performing uniform mixing and stirring to obtain a suspension liquid; performing spray drying on the suspension liquid to obtain lithium mixed powder; and sintering the lithium mixed power to obtain the lithium nickel manganese cobalt positive electrode material. By the preparation method, the mixing efficiency of a precursor and a lithium source compound and the mixed grain uniformity can be improved; and meanwhile, the preparation method is convenient to operate and easy to control and is moderate in reaction condition, and the prepared positive electrode material has excellent electrochemical performance.

The invention discloses an electrolyte solution capable of improving over-charge safety performance of a lithium battery, which comprises following four types of components: (A) lithium salt, (B) organic solvent of carbonic esters and/or ethers, (C) over-charge safety additive and (D) other functional additives, wherein the composition of the solution can be written into A+B+C+D; the molar concentration range of the (A) lithium salt in the electrolyte solution is 0.001-2 mole/L; the mass ratio range of the (C) over-charge additive in the electrolyte solution is 0.01-30%, the molar concentration range of the (D) other functional additives in the electrolyte solution is 0-0.5 mole /L. The electrolyte solution can be applied to a lithium primary battery, a lithium secondary battery and a lithium ion battery.

The invention discloses a large-capacity double-bag type iron-nickel battery. A battery pole plate is composed of a bag type nickel positive pole plate, a bag type iron negative pole plate and a multilayered composite diaphragm or isolation grid located between the bag type nickel positive pole plate and the bag type iron negative pole plate; an electrode material of the bag type nickel positive pole plate is composed of a positive pole active material, a conducting agent, an additive and a binding agent; an electrode material of the bag type iron negative pole plate is composed of iron-basedoxide powder, a conducting agent, an additive and a binding agent; electrolyte is an alkaline solution which is at a barren liquor state and contains the additive. According to the large-capacity double-bag type iron-nickel battery disclosed by the invention, a formula of positive and negative poles is optimized, a formula of the electrolyte is optimized and a battery structure is adjusted, so that the charging and discharging performance, and circulating performance of the novel iron-nickel battery are improved; furthermore, the battery also has the advantages of high charging and dischargingvoltage platform, good over-charging and over-discharging resisting performance, low cost and the like.

The invention discloses a lithium ion battery anode material and a lithium ion battery prepared therefrom. The anode material comprises15-60% by weight of lithium cobaltate, 10-45% by weight of nickel-cobalt lithium manganate and 10-40% by weight of spinel lithium manganate,. The lithium ion battery anode material prescription and the lithium ion battery made from the material prescription can improve the overcharge property resistance of the lithium ion battery and can not decrease the capacity of the lithium ion battery.

The invention discloses a hydrogen storage alloy electrode for a nickel-metal hydride battery. The hydrogen storage alloy electrode comprises a cathode collector and a cathode active substance slurry coated on the cathode collector, wherein the cathode active substance is composed of LaNi5H6 hydrogen storage alloy powder, iron phthalocyanine additive and mixed adhesive at a weight ratio of 100:(0.1-1.0):(15-20); the mixed adhesive is composed of HPMC (Hydroxy Propyl Methyl Cellulose) with a weight percentage concentration of 2% and SBR (Styrene Butadiene Rubber) with a weight percentage concentration of 50%; the weight ratio of HPMC to SBR is (2-5):1; and the LaNi5H6 hydrogen storage alloy powder is cobalt-cladding LaNi5H6 hydrogen storage alloy powder. Compared with the prior art, the hydrogen storage alloy electrode for the nickel-metal hydride (Ni-MH) battery provided by the invention has the advantages that the inner voltage of the battery is obviously reduced, the discharge capacity is higher and the overcharging resistance and the cycle performance are excellent.