152results about How to "Improve electrochemical cycle performance" patented technology

The invention relates to a nano carbon material with a network structure consisting of polymer chains, in particular to a nano carbon sulfur composite material with a network structure suitable to be used in a secondary lithium sulfur battery anode and a preparation method thereof. The carbon sulfur composite material is formed by adopting the following steps of: introducing functional groups onto carbon particles by adopting the electric conductivity and the porosity of a carbon material and the reaction capacity of similar condensed aromatics of the carbon material and by means of an irreversible chemical reaction; introducing the polymer chains, wherein the polymer chains are stretched, bent and cross-linked on the surfaces of the carbon particles to form a cross-linked network structure; and compounding a sulfur element or a polysulfide (m is more than 2) containing -Sm- structure into the network structure to form the nano carbon sulfur composite material with the network structure. The carbon sulfur composite material has a rich cross-linked network structure, nano-scale network pores constrain the sulfur element or the polysulfide (m is more than 2) containing the -Sm- structure in the network, and the active substances are limited in a certain region to react, so that the composite material has predominant electrochemical performance.

The invention discloses a method for synthesizing a Li4Mn5O12 sub-micrometer rod, belonging to the technical field of synthesis of active material of a lithium ion battery. The method includes the following steps: firstly, synthesizing a MnOOH sub-micrometer rod through hydrothemal method and secondly preparing Li4Mn5O12 through solid phase technique, wherein the MnOOH sub-micrometer rod is synthesized by taking MnSO4.H2O, KMnO4 and CTAB as raw materials through the steps of keeping the materials warm for 12h-30h under 140 DEG C to 180 DEG C, washing through alcohol and deionized water, and drying; and the Li4Mn5O12 is prepared by taking MnOOH and LiOH.H2O as raw materials through the step of keeping the materials warm for 10h-24h under 500 DEG C-900 DEG C. The method has the advantages of easy implementation, good repeatability and low material cost, and the product of Li4Mn5O12 is of one-dimensional structure which facilitates the transfer of the Li +/charges in the one-dimensional direction when the Li4Mn5O12 sub-micrometer rod is applied on the lithium ion battery and is good for improving the performance of the lithium ion battery.

The invention discloses an element co-doping modified ternary lithium ion battery cathode material, and a preparation method thereof. According to the preparation method, compounds of two kinds of metals Me<1> and Me<2> are respectively selected based on the difference of ion radiuses of lithium ion and transition metal ions in the lithium nickel cobalt manganese ternary material, and are subjected to high temperature sintering with a nickel cobalt manganese precursor, wherein the ion radius of the metal Me<1> ion is close to that of lithium ion, and the metal Me<1> ion is one or a mixture of ions selected from Zn2+ and Zr4+, the radius of the metal Me<2> ion is close to that of transition metal ion Co3+ or Mn4+, and the metal Me<2> is one or a mixture of ions selected from Al3+, V5+, and Ge4+; and then a primary product obtained via high temperature sintering is subjected to second cladding so as to obtain the element co-doping modified ternary lithium ion battery cathode material. The element co-doping modified ternary lithium ion battery cathode material is capable of achieving synergistic effects of two metal elements fully, and improving cycle performance of lithium ion batteries effectively.

The invention discloses a high-temperature type lithium manganate anode material for a power lithium ion battery. The high-temperature type lithium manganate anode material consists of a core material as shown in a formula Li1+xMn2-y-zAyQzO4, and a coating layer on the surface of the core material, wherein the coating layer is one or more of cobaltosic oxide, aluminum oxide and nickel protoxide. The anode material is excellent in high-temperature property, and is good in specific discharge capacity, capacity retention ratio and electrochemical circulation property at high temperature. In addition, the preparation method of the anode material disclosed by the invention is simple in production process, easy to achieve and low in cost, and can be applied to large-scale industrialization production.

The invention provides a high-performance silicon/carbon anode nanocomposite and a preparation method thereof. The high-performance silicon/carbon anode nanocomposite is characterized by containing carbon nano-spherical particles with mesoporous channels, and the spherical particles and/or the mesoporous channels are filled with elementary silicon particles. The prepared silicon/carbon anode nanocomposite is of a porous structure, the elementary silicon particles are dispersed in a carbon skeleton and the mesoporous channels, the volume expansion effect during lithium-ion charge and dischargeis low, and electrochemical cycle performance is stable.

The invention discloses a composite metallic-oxide-cladded lithium nickel cobalt manganese oxide anode material and a preparation method thereof. One metallic element in the composite metallic oxide in the anode material is Al of which the mass is 0.02%-0.92% of that of the lithium nickel cobalt manganese oxide; and the other metallic element in the composite metallic oxide in the anode material is one selected from transition metal Co or Zn, and the mass of the other metallic element is 0.2%-4.0% of that of the lithium nickel cobalt manganese oxide. The composite metallic-oxide-cladded lithium nickel cobalt manganese oxide anode material can be used to exert the respective advantages of the two metallic oxides and the synergy effect between the two metallic oxides sufficiently, thus improving the electrochemical cycle performance and the specific discharge capacity of the anode material under the condition of higher charge cut-off voltage obviously. The preparation method comprises the following steps: forming a hydrotalcite precursor layer on the surface of the lithium nickel cobalt manganese oxide firstly; and roasting to obtain the composite metallic-oxide-cladded lithium nickel cobalt manganese oxide anode material, thus ensuring the uniform distribution of two kinds of metallic ions in the hydrotalcite precursor and the oxide cladding layer of the final product, thereby exerting the best cladding effect.

This invention provides a spinel compound metal oxide electrode material and its preparation method, in which, the composition of the electrode material is Mfe204, M is one element or composition of any two elements in Co, Ni Cu and Fe of +2 valence transition metal elements. Taking compound metal oxide M-Fe2+-Fe3+|-LDHs as the precursor and M is one element or composition of any two elements in Co, Ni, Cu, Fe elements, the electrode material is got by baking them under a certain temperature, compared with carbon materials, said electrode material has higher mass ratio capacity and volume ratio capacity.

The invention discloses a lithium ion battery anode material and a manufacturing method of the lithium ion battery anode material. The anode material is cobalt nickel oxide manganese with a layer structure and has the chemical composition of LiNil-x-yCoxMnyO2, wherein x is equal to and larger than 0.15 and is equal to and less than 0.3, and y is equal to and larger than 0.2 and is equal to and less than 0.4. The manufacturing method provided by the invention has the following steps: the cobalt nickel oxide manganese powder is manufactured through a coprecipitation method, metal phosphate is adopted as a cladding material with the cladding quantity as 0.5-1.5% of the anode material; and the cobalt nickel oxide manganese is externally cladded by zinc phosphate through fluidization. The cladded battery material after modification with the manufacturing method has high special capacity and has good cycling stability at high temperature.

The invention relates to a method for preparing a sandwich Co-Al-hydroxide composite metal oxide (Co-Al-LDH) electrode material of super capacitor, belonging to the technical field of preparing the electrode material of super capacitor. The invention uses an all-returning mixed solution film reactor to make coprecipitation reaction on Co-Al mixed salt solution and basic solution, making nucleation/crystallization separation, controlling the nucleating and growing conditions of the crystal, respectively, then baking at a certain temperature, and fully exposing the electrochemical active situ of the Co on the basis of keeping the sandwich of Co-Al-LDH. The prepared Co-Al-LDH has the advantages of high specific capacitance, good multiplication property, and excellent electrochemical circulating performance.

The invention discloses a silicon embedded redox graphene/graphite phase carbon nitride composite material, preparation and application thereof. The silicon embedded redox graphene/graphite phase carbon nitride composite material comprises a redox graphene/graphite phase carbon nitride composite matrix serving as the base material, nano-silicon spheres that act as the active centre and are evenlydispersed and embedded in the lamellar gap of the redox graphene/graphite phase carbon nitride composite matrix, and a carbon layer that is located on the surfaces of the nano-silicon spheres and canstrengthen the chemical bonding force between the active centre and the base material. The silicon embedded redox graphene/graphite phase carbon nitride composite material provided by the invention has good electrochemical cycle performance, excellent compatibility and structural stability, can give play to good synergistic effect between the components, also has high batch stability, and is easyfor large-scale production.

The invention relates to a lithium-sulfur battery positive pole material and a preparation method thereof, and belongs to the technical field of battery materials. The provided positive pole material has abundant micropores and mesopores; porous nano carbon thin sheets with a three-dimensional communicated net structure are taken as the skeleton; nano sulfur dots are filled into the pores of the net structure, and the outer layer of the skeleton is wrapped by reduced oxidized graphene. The preparation method comprises the following steps: mixing porous nano carbon thin sheets with a sulfur single substance, subjecting the mixture to ball milling, carrying out reactions at a temperature of 180 to 200 DEG C in an enclosed environment in the absence of oxygen and water under the protection of inert gas to obtain a porous nano carbon thin sheet/nano sulfur compound; dissolving the compound into an ethanol solution, dispersing the compound by ultrasonic waves, adding oxidized graphene, adjusting the pH to 10.1 by ammonia water, carrying out ultrasonic dispersion, carrying out hydrothermal reactions at a temperature of 80 to 100 DEG C, filtering, washing the reaction product until the reaction product becomes neutral, and drying to obtain the positive pole material. The positive material has the advantages of high specific capacity and stable electrochemical circulation performance, moreover, the preparation method is simple, the price is low, and the positive material is environment-friendly and can be easily produced in batches.

The invention discloses a manufacturing method of a negative plate of a safety lithium-ion battery. The method comprises the steps of mixing a negative active material with a conductive agent at a certain mass ratio to obtain a mixture A; carrying out ball-milling and mixing on an additive B and the mixture A at a certain mass ratio to form a mixture C; preparing a certain mass percent of water solution from CMC which accounts for a certain mass ratio of the mixture C, carrying out constant-temperature stirring, adding an SBR which accounts for a certain mass ratio of the mixture C in batches, simultaneously adding an NMP which accounts for a certain ratio of the mixture C and carrying out constant-temperature stirring to form a sizing material D; adding the mixture C to the sizing material D in batches, controlling the solid content of the mixture C and stirring to obtain slurry; adding a proper amount of water, adjusting, controlling the viscosity and stirring to obtain negative slurry E; employing copper foil as a current collector F, intermittently coating a single side or double sides of the current collector F with the negative slurry E, reserving a certain current collector, carrying out drying, controlling the surface density, carrying out rolling and controlling the compactness and the thickness of the negative plate; and dividing, cutting, welding and pasting a tab adhesive tape to obtain the negative plate of the safety lithium-ion battery. The lithium-ion battery assembled by the negative plate has good electric cycle performance and safety performance.

The invention discloses an organic cathode material for a sodium ion battery capable of being repeatedly charged and discharged, and belongs to the field of batteries. According to the organic cathode material for the sodium ion battery disclosed by the invention, an active substance of the organic cathode material is para-phthalate or a mixture of different para-phthalates; the chemical composition of the para-phthalate is C8H4O4.Rx, wherein R is Li, K, Rb, Cs, Mg, Ca, Sr, Ba, Ni, Cu, Sn, Fe, Zn, Cr, Al or Mn, and x is equal to 2/7, 1/3, 2/5, 1/2, 2/3, 1 or 2. The organic cathode material disclosed by the invention has low reaction potential, high quality specific capacity and excellent electrochemical cycle stability, and is simple in synthetic method and good in repeatability; the production cost is reduced, the requirement of sustainable development is met, and the organic cathode material has a wide application prospect in the field of sodium ion batteries.

The invention relates to a polymer and nanometer sulfur composite material with a shell and egg yolk structure and a preparation method of the composite material. The composite material is provided with the shell and egg yolk double-layer structure, a central nucleus is formed by sulfur particles, an outer shell is formed by a polymer, a gap is preserved between the central nucleus and the shell, so that the double-layer structure like an egg shell and an egg yolk is formed; elemental sulfur is shrunk in the process that the temperature is quickly changed by using the change of crystal form and the change of density in different temperatures, and the elemental sulfur is partially dissolved and separated out by using a solvent, so that the composite material of the shell and egg yolk structure is formed. The composite material of the structure is applicable to cathodes of lithium sulfur batteries, structure collapse caused by volume expansion in the discharge process of the elemental sulfur is relieved, the dissolution and loss of discharge products are inhibited, and the electrical conductivity and circularity of the material are improved.

The method for preparing lithium-manganese oxide by using low-beat solid phase reaction includes the following steps: according to stoichiometric ratio mixing lithium acetate, manganese acetate and solid phase organic acid or alcohol or sugar or amino acid; grinding at room temp., drying the obtained mixture at 75-85 deg.C and calcining at 350-850 deg.c for 12-18 hr. so as to obtain the invented final product Li1+xMn2O4 or Li1+xMnO2, in which x=-0.1í½+0.2. According to different stoichiometric ratio the spinelle type LiMn2O4 or laminate LiMnO2 can be obtained.

The invention discloses a nitrogen-doped carbon-coated silicon nanoparticle composite material and a preparation method thereof. The preparation method comprises the following steps that: S1: puttinga silicon nanoparticle of which the grain diameter is 30-50nm in Tris-HCl buffer solution of which the pH (Potential of Hydrogen) is 7.5, cleaning, and drying to obtain processed silicon nanoparticles; S2: adding dopamine hydrochloride into Tris-HCl buffer solution of which the pH is 8.5, and dissolving to obtain dopamine solution; S3: adding the silicon nanoparticle processed in S1 into the dopamine solution obtained in S2, evenly dispersing, carrying out stirring reaction at the room temperature for 1-8 days, and carrying out separation and drying to obtain reactant; and S4: under an inert atmosphere, calcinating the reactant obtained in S3 at a temperature of 700-900DEG C for 1-2h to obtain a composite material. The invention also discloses the application of the above composite material on a lithium battery negative electrode. The composite material synthesized by the preparation method has excellent cycling stability.

The invention relates to a new anode material with interlaminar doping Li(1-2beta)(AE) (beta)CoO2 (AEú¢Mgú¼Ca) by substituting lithium ion by alkaline-earth metal ion and opposite fused salt ion exchange reaction preparation method. Wherein, the preparation method comprises: preparing layer-shape LiCoO2 predecessor with little and even size with citrate sol-gel method; substituting part lithium ion with Mg2+ or Ca2+ by fused salt ion exchange reaction; baking to distribute lithium ion and alkaline-earth metal ion evenly in main body layer constructed by CoO2. This product has more stable structure, better anti-overcharge performance, higher specific capacity and super electrochemical circulation property.

The invention provides a method for recycling valuable metals of a waste lithium ion battery and regenerating a ternary positive electrode material. The method comprises the following steps of: discharging the waste lithium ion battery, performing disassembling, and removing impurities to obtain a positive plate, and removing a conductive agent and a binder in the positive plate at high temperature to obtain the waste ternary positive electrode material; according to a first regeneration route, valuable metal ions can be leached out from organic acid or a eutectic solvent added with a reducingagent, a sodium alginate solution is adopted to crosslink the metal ions to form an egg box structure gel with a three-dimensional net structure, and the regenerated ternary positive electrode material is obtained after calcination; according to a second regeneration route, ball milling nanocrystallization is beneficial for lithium ions to enter particles to supplement lithium, gel is used for repairing an uneven surface, and the regenerated ternary positive electrode material is obtained after calcination. The two regeneration routes are simple and easy to operate, the steps of separation and purification of valuable metal ions and the like are avoided, the method is novel, low in cost, and easy to realize industrialization, and the prepared material has excellent electrochemical performance.

The invention relates to a preparation method of an NCM ternary positive electrode material with La3+ doped on a surface layer, belonging to the field of chemical energy storage batteries. According to the method of the invention, La3+ is doped in the process of mixing a nickel cobalt manganese hydroxide precursor with the lithium salt, and the doped La3+ enters a transition metal layer of the surface layer to occupy the position of Ni2+ and can play roles in supporting the framework, suppressing the phase change of the surface layer structure and suppressing the mixed arrangement of Li+/Ni2+;in addition, La3+ has a relatively large ionic radius, and after La3+ is doped to enter the transition metal layer, a channel for embedding and extraction of Li+ can be widened, the transmission rateof Li+ can be improved, and the electrochemical performance of the NCM ternary positive electrode material at high voltage and high magnification (4.5V, greater than or equal to 1C) can be significantly improved.

The invention belongs to the field of lithium ion batteries and super-capacitors, and in particular relates to a lithium nitride/ceramic-based composite anode material and a preparation method thereof, wherein the lithium nitride/ceramic-based composite anode material is prepared by a mechanochemical method and has high specific capacity, electrochemical lithium intercalation-detercalation reversibility and steady cycle performance. The composite material is a composite material which takes lithium nitride as an activity reinforced body and ceramic powder containing silicon element as a matrix; in the composite material, the chemical bonding is taken as a main interfacial bonding mode between the reinforced body and the matrix, the reinforced body and the matrix have good structural stability, and the mol ratio of the reinforcement body to the matrix is 1: 1-9: 1. The material has better electrochemical cycle performance and rate performance; and the material has a wider voltage window, has good ionic conductivity and cyclicity, and has potential application value in novel super-capacitor electrode materials. The preparation method is simple and easy to control, and the needed raw materials do not contain heavy metal elements and have the advantages of environmental protection and low cost.

The invention discloses a manufacturing method for a safe lithium ion power battery positive plate. The manufacturing method comprises the steps of performing ball milling and mixing on a positive electrode active substance and a conductive agent based on mass percent to obtain a positive electrode powder mixture A; adding the positive electrode powder mixture A into solvent based on a certain proportion, and stirring to obtain a solvent sizing material B; adding the positive electrode powder mixture A into the sizing material B in multiple times, controlling the mass ratio of the solid body quantity of the positive electrode powder mixture A to the solvent, stirring and preparing positive electrode slurry, adjusting and controlling the viscosity of the slurry, and stirring to obtain positive electrode slurry; taking an aluminum foil as a current collector, coating the current collector with the positive electrode slurry in a single-surface coating manner; reserving ML current collector, drying, controlling the surface density, rolling, controlling compaction density and the pole piece thickness; and performing operations of striping, slitting, tab spot welding, and T-shaped tab rubber tape gluing to obtain the safe lithium ion power battery positive plate. The lithium ion battery assembled by the manufactured safe lithium ion power battery positive plate is good in electrical performance and extremely high in safety performance.

The invention relates to a phosphor-doped nano silicon lithium ion battery negative material and a preparation method thereof. The method comprises that a simple silicon nano-material is added into anethanol solution in the liquid-solid ratio of 3-6L/Kg, and stirred to obtain a nano silicon ethanol slurry; a phosphor source is added into the nano silicon ethanol slurry in the Si:P mol ratio of 1:0.0094-0.0360, stirred, and dried to obtain a first mixed material; the first mixed material is thermally insulated at the temperature of 750-1050 DEG C in the protective atmosphere for 4-10h, and cooled to obtain a second mixed material; and the second mixed material is added to a 5wt% of hydrofluoric acid solution in the liquid-solid ratio of 40-60L/Kg, immersed, washed, and dried to obtain thephosphor-doped nano silicon lithium ion battery negative material. Technology is simple, operation is convenient, and the prepared phosphor-doped nano silicon lithium ion battery negative material isstable in structure and high in electrochemical circulation performance.