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1811results about How to "Improve cycle stability" patented technology

Silicon-carbon negative electrode material of lithium ion battery and preparation method thereof

ActiveCN102394287AExcellent intercalation and delithiation abilityImprove cycle stabilityCell electrodesFiberCarbon composites
The invention discloses a silicon-carbon negative electrode material of a lithium ion battery and a preparation method thereof, and solves the technological problem of improving the charge and discharge cycling stability of the electrode material. The silicon-carbon negative electrode material is prepared by mixing a silicon-carbon composite material and a natural graphite material, wherein the weight of the silicon-carbon composite material is 7-20% and the silicon-carbon composite material is prepared by depositing carbon nanotube and/or carbon nanofiber on the surface of nanometer silica fume and/or embedding into the nanometer silica fume to form core, the surface of which is covered with 3-15wt% of a carbon layer. The preparation method provided by the invention comprises steps of: precursor silicon powder preparation; chemical vapor deposition; liquid-coating roasting; crushing; and mixing. In comparison with the prior art, the reversible specific capacity of the silicon-carbon composite negative electrode material is greater than 500mAh/g; the coulombic efficiency for a first cycle is greater than 80%; the capacity conservation rate of cycling for 50 weeks is greater than 95%. The preparation method is simple, is easy to operate, requires low cost and is suitable for a high-volume negative electrode material of lithium ion batteries used for various portable devices.
Owner:BTR NEW MATERIAL GRP CO LTD

Hard carbon material for power and energy-storage battery and preparation method thereof

ActiveCN101916845AExcellent intercalation and delithiation abilityImprove cycle stabilityCell electrodesHigh rateCharge discharge
The invention discloses a hard carbon material for a power and energy-storage battery and a preparation method thereof, and aims to solve the technical problem of improving high-rate charge-discharge performance of lithium-ion batteries. The material is provided with a hard carbon matrix, and a coating is coated outside the hard carbon matrix; and the surface of the hard carbon matrix has a honeycomb opening structure. The preparation method comprises the following steps of: dipping, washing, dewatering and drying, presintering at low temperature, crushing, pyrolyzing, crushing and coating. Compared with the prior art, the hard carbon material has the reversible specific capacity of more than 450mAh/g, the first cycle columbic efficiency of over 81 percent, 0.2C 300-cycles capacity-retaining rate of over 97 percent at the temperature of 60 DEG C, and the 0.2C 300-cycles capacity-retaining rate of over 88 percent at the temperature of -30 DEG C, has the advantages of excellent lithium intercalation and deintercalation capability and cycling stability, and simple preparation process, and is applicable to the lithium ion battery cathode materials for lithium ion power batteries, various portable devices and electric tools.
Owner:深圳贝特瑞钠电新材料科技有限公司

Nanometer lithium titanate/graphene composite negative electrode material and preparation process thereof

The invention relates to the field of negative electrode materials of lithium ion batteries, and specifically to a nanometer lithium titanate/graphene composite negative electrode material and a preparation process thereof. According to the invention, micron-sized lithium titanate prepared by the solid phase method is subjected to ultrafine ball milling to obtain nanometer powder, and the nanometer lithium titanate powder and graphene are uniformly compounded and subjected to heat treatment so as to obtain a high performance lithium ion battery negative electrode material; the invention is characterized in that uniform distribution of graphene in the nanometer lithium titanate powder is realized through in situ compounding; the weight of graphene in the composite negative electrode material accounts for 0.5 to 20%, and the weight of lithium titanate accounts for 80 to 99.5%. The lithium ion battery negative electrode material has good electrochemical performance, 1C capacity greater than 165 mAh/g, 30C capacity greater than 120 mAh/g and 50C capacity greater than 90 mAh/g. Nanometer lithium titanate in the lithium ion battery negative electrode material prepared in the invention has high phase purity; the preparation process of the material is simple and is easy for industrial production.
Owner:INST OF METAL RESEARCH - CHINESE ACAD OF SCI

Method for preparing multilevel porous carbon base composite phase change material

The invention provides a method for preparing a multilevel porous carbon base composite phase change material, and belongs to the field of composite phase change materials. The method comprises the following steps: at first, preparing an organic metal skeleton material by using such methods as a solution method, a solvothermal method or a stirring synthesis method; with the organic metal skeleton material as a template, high temperature carbonizing under the protection of an inert gas, and changing the carbonizing temperature and the post treatment manner to obtain a multilevel porous carbon material with a super-large specific surface area and a super-large pore volume; selecting proper solvents according to different kinds of phase change core materials, preparing the phase change core materials to a solution, dispersing the porous carbon material into the solution, removing the solvent by such manners as heating, and meanwhile the phase change core materials are adsorbed and limited in the porous carbon material. The composite phase change material prepared by the method provided by the invention has good thermal storage property, can effectively avoid the leakage problem of the phase change core material, and has the advantages of excellent heat transfer property, good cycling stability and wide application range, and the process is simple and is suitable for large-scale production.
Owner:UNIV OF SCI & TECH BEIJING

Silicon/graphene laminar composite material for lithium ion battery cathode and preparation method thereof

The invention relates to a preparation method of a silicon/graphene laminar composite material for lithium ion battery cathode. The composite material adopts a laminar sandwich structure, silicon nano-particles are dispersed on each lamina of the grapheme, the laminas of the grapheme are separated from one another by the silicon nano-particles and the edges of the laminas are in lapped joint so as to constitute a laminar conductive network structure. The preparation method thereof comprises the steps of: formulating anhydrous silicon tetrachloride, surface active agent, sodium naphthalene and graphite oxide to tetrahydrofuran solution, adding the tetrahydrofuran solution into a reactor for reaction in vacuum at the temperature ranging from 380 to 400 DEG C, filtering the reactant to result in the product, and then washing, drying and heating the product to obtain the silicon/grapheme composite material. The preparation method of the invention has the advantages of simple preparation process and great easiness for industrial production; and the silicon/graphene laminar composite material prepared according to the method includes excellent conductivity, power performance, electrochemical activity and cycle stability, and is particularly suitable for manufacturing lithium ion battery cathode.
Owner:深圳清研紫光科技有限公司

Carbon cladded ferriferrous oxide negative electrode material of lithium ion battery and preparation method thereof

The invention discloses a carbon cladded ferriferrous oxide negative electrode material of a lithium ion battery and a preparation method thereof. The negative electrode material is a carbon cladded Fe3O4 composite material and has a particle size in a range of 1 to 100 nm. The preparation method comprises the following steps: with NaCl used as a dispersing agent and a supporter, fully mixing NaCl with a metal oxide source and a solid carbon source; drying an obtained mixed solution under vacuum to obtain a mixture; placing the mixture into a tubular furnace for calcination in an inert atmosphere so as to obtain a calcined product; and rinsing and grinding the calcined product to obtain carbon cladded metal oxide nanometer particles. The method is safe and non-toxic and is simple to operate; during charging and discharging tests of a lithium ion button cell made of the carbon cladded ferriferrous oxide negative electrode material, discharge specific capacity can be maintained at 620 to 900 mAh/g after 30 cycles of charging and discharging at a current of 0.1C (with current density being 92 mA/g), and discharge specific capacity can be maintained at 600 to 760 mAh/g after 50 cycles of charging and discharging at a current of 1C (with current density being 920 mA/g); and the negative electrode material of the lithium ion battery has high reversible capacity and good cycling stability.
Owner:TIANJIN UNIV

Graphene-cladding manganese dioxide combination electrode material and method for producing same

A graphene-cladding manganese dioxide combination electrode material and a method for producing the same, belonging to the technical field of electronic functional materials, the graphene-cladding manganese dioxide combination electrode material comprises nano manganese dioxide particles and graphene cladded with manganese dioxide particles, wherein the mass ratio of graphene and the nano manganese dioxide particles is 1:(1.25-10). The method comprises the following steps: preparing the nano manganese dioxide particles and graphite oxide respectively, and mixing and ultrasonically dispersing to obtain the graphene-cladding manganese dioxide dispersing agent, finally, reducing the graphite oxide to obtain the graphene-cladding manganese dioxide combination electrode material. The graphene is used to clad the manganese dioxide, so the electrical conductivity and cycling stability of the electrode material parts can be improved; and meanwhile, the existence of the manganese dioxide particles also effectively prevents the graphene from reunion, so the specific capacity of the electrode material of a supercapacitor is obviously increased. The method has a simple technology, reaction products are easy to control, the purity is high, and the produced combination electrode material is suitable for producing an electrode plate of the supercapacitor.
Owner:UNIV OF ELECTRONIC SCI & TECH OF CHINA

Application of borate compound serving as additive for high-voltage lithium-ion battery electrolyte

The invention belongs to the field of lithium-ion batteries, and particularly relates to an application of a borate compound serving as an additive for high-voltage lithium-ion battery electrolyte. The borate compound is in a structure as described in formula 1. The invention also discloses the high-voltage lithium-ion battery electrolyte which is obtained by adopting a means of adding the functional additive into common electrolyte, wherein the weight of the added functional additive accounts for 0.1%-5% that of the common electrolyte; the common electrolyte consists of a cyclic carbonate solvent, a liner carbonate solvent and conductive lithium salt; the functional additive is the borate compound. By virtue of the added additive, on one hand, the interface of a positive electrode/the electrolyte is optimized, the surface activity of the positive electrode is lowered and the oxygenolysis of the electrolyte is inhibited; on the other hand, due to the introduction of boron, the safety of the electrolyte is enhanced remarkably. By virtue of the high-voltage lithium-ion battery electrolyte, the safety performance and the cycling performance of a high-voltage (3-4.9Vvs.Li/Li<+>) lithium battery can be enhanced.
Owner:SOUTH CHINA NORMAL UNIVERSITY

Preparation method of biomass-based nitrogenous porous carbon, porous carbon prepared by method and use thereof

The invention discloses a preparation method of biomass-based nitrogenous porous carbon, the porous carbon prepared by the method and the use of the prepared nitrogenous porous carbon in a super capacitor. The preparation method comprises the steps of (1) drying a biomass material, and grinding the biomass material into fine powders, (2) evenly mixing the biomass material powders and water or a dilute acid solution, (3) placing the above mixture into a reactor for hydrothermal reaction, and (4) drying and grinding an obtained hydrothermal reaction product, and calcining the hydrothermal reaction product in a tube furnace to obtain a nitrogen-doped porous carbon material with a large surface area. According to the method of the invention, cheap and renewable plant is used as carbon and nitrogen precursors, and the porous nitrogen-doped carbon material is prepared through a hydrothermal method. The method has the advantages of simple preparation process, no need of an activator or template agent, low cost, environmental protection, and convenient operation, problems of strong corrosion, a high price of transition metal and environmental pollution caused by heavy metal are avoided, and the method is suitable for mass production.
Owner:QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI +1

Nano-Si or nano-Sn containing composite cathode material for lithium ion battery and preparation method thereof

The invention belongs to the technical field of nano-materials and chemical power sources and particularly provides a nano-Si or nano-Sn containing composite cathode material for a lithium ion battery and a preparation method thereof. The composite cathode material of the invention comprises the following components: cathode active substances, nano-Si or nano-Sn, and macromolecule polymers. The method taking the above components as raw materials comprises the following steps: firstly, preparing mixed solution; then, removing organic solvent; further coating the mixed solution with the macromolecule polymers; then, removing organic solvent; and finally, carrying out carbonization treatment to obtain the finished product. The invention has the advantages of fewer components, low cost, simple process and low energy consumption; and the composite cathode material prepared by the method of the invention has a core-shell structure and has the characteristics of high capacity, high stability and high capability of rapidly charging and discharging. Therefore, the composite cathode material of the invention is widely applicable to lithium ion batteries, super-capacitors and other components based on new energy resources and particularly applicable to lithium ion batteries for electric vehicles.
Owner:重庆锦添翼新能源科技有限公司 +1

Modified high nickel ternary positive electrode material and its preparation method and lithium ion battery

The invention discloses a modified high nickel ternary positive electrode material. The surface of a high nickel ternary positive electrode material is coated with a coating layer containing a fast ion conductor. The fast ion conductor has the chemical general formula of Li3x1La2/3-x1Ma1TiNz1O3, Li2+2x2Zn1-x2GeO4 or LiM'2(PO4)3, wherein M represents Ba<2+> and/or Sr<2+>, N represents Al<3+> and/orZr<4+>, x1 is greater than or equal to 0.04 and less than or equal to 0.167, a1 is greater than or equal to 0 and less than or equal to 1, z1 is greater than or equal to 0 and less than or equal to 1, x2 is greater than -0.3 and less than 0.8, and M' represents one or more of Zr, Ti, Ge and Hf. Compared with the existing positive electrode material, the modified high nickel ternary positive electrode material is provided with the coating layer containing the fast ion conductor and the coating layer can react with residual lithium on the surface of the material to reduce residual lithium on the surface of the material and inhibit side reactions of the residual lithium and the electrolyte so that material surface stability and cycle performances are improved. The modified high nickel ternary positive electrode material has good lithium ion deintercalation ability, improves the first discharge capacity of the material and first coulombic efficiency and has a good application prospect. The invention also discloses a preparation method of the modified high nickel ternary positive electrode material and a lithium ion battery.
Owner:CONTEMPORARY AMPEREX TECH CO
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