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76results about How to "Excellent high magnification performance" patented technology

Preparation method of lithium titanate-graphene combination electrode material

The invention relates to a preparation method of lithium titanate-graphene combination electrode material, belonging to the field of electrochemical power source; in the invention, the lithium titanate and graphite oxide are mixed and are prepared into titanate-graphene combination electrode material by heating under inert atmosphere; in the synthesized lithium titanate-graphene combination electrode material, metallic lithium is used as the cathode for preparing a battery, and the first charging and discharging capacity exceeds 186mAh / g when 10C charging and discharging is carried out; after 100 circles of the charging and discharging are carried out, the discharging capacity is higher than 116mAh / g. the method in the invention has low cost, and simple and flexible preparation procedures, and is suitable for industrial large-scale production. High multiplying power of the prepared titanate-graphene combination electrode material has good performance, and the combination electrode material has high specific capacity and can be widely applied to lithium ion batteries of various kinds of potable electronic equipment and various electric motors.
Owner:SOUTH CHINA UNIV OF TECH

Nickel cobalt lithium manganate composite anode material of lithium ion battery and preparation method of nickel cobalt lithium manganate composite anode material

The invention relates to a nickel cobalt lithium manganate composite anode material of a lithium ion battery and a preparation method of the nickel cobalt lithium manganate composite anode material, and belongs to the technical field of anode materials of lithium ion batteries. The composite anode material comprises nickel cobalt lithium manganate and lithium lanthanum titanate wrapping the surface of the nickel cobalt lithium manganate. The chemical formula of the composite anode material is LiNixCoyMn(1-x-y) O2 / LizLa (2-z) / 3TiO3, x is greater than 1 and smaller than 1, y is greater than 0 and smaller than 1, (x+y) is greater than 1 and smaller than 1, z is greater than or equal to 0.5 and smaller than or equal to 1.5, and the mass percent of the lithium lanthanum titanate is 0.5-1.5%wt. A layer of stable conductive materials which are the lithium lanthanum titanate wraps the surface of the nickel cobalt lithium manganate composite anode material. On one hand, the structure of the nickel cobalt lithium manganate composite anode material is quite stable; and on the other hand, the ionic conductivity of the nickel cobalt lithium manganate material is quite high, so that dissolution of the nickel cobalt lithium manganate material is restrained, the conductivity is improved, and the rate capability and the recycling performance of the material are greatly improved.
Owner:中国东方电气集团有限公司

Sandwich core-shell structured lithium-rich manganese base, spinel and graphene flexible composite positive electrode and production method thereof

The invention discloses a sandwich core-shell structured lithium-rich manganese base, spinel and graphene flexible composite positive electrode and a production method thereof, and belongs to the field of material synthesis. The chemical formula of a lithium-rich manganese base positive electrode material is aLi2MnO3.(1-a)LiMO2, and the chemical formula of a spinel material is LiMn2-xMxO4, wherein x is not less than 0.1 and is less than 1, M = Mn1-x-yNixCoy, x is not less than 0 and not more than 0.5, and y is not less than 0 and not more than 0.5. The production method comprises the following steps: carrying out a coprecipitation technology to obtain a manganese nickel cobalt carbonate spherical precursor, uniformly mixing the precursor with a lithium salt compound, calcining the obtained mixture to obtain the spherical lithium-rich manganese base positive electrode material, mixing the positive electrode material with a graphene oxide dispersion, carrying out a vacuum suction filtration technology to produce a sandwich structured lithium-rich manganese base and graphene oxide composite film, and carrying out high-temperature in-situ carbothermal reduction to produce the sandwich core-shell structured lithium-rich manganese base, spinel and graphene flexible composite positive electrode. The production method has the advantages of simple process and low production cost; and the sandwich core-shell structured lithium-rich manganese base, spinel and graphene flexible composite positive electrode has the advantages of obviously improved and reliable performances, large specific capacity, excellent rate and excellent cycle performances.
Owner:黑龙江瑞霭科技有限公司

Hollow-structure carbon and silicon negative pole material used for lithium ion battery, and preparation method of hollow-structure carbon and silicon negative pole material

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a hollow-structure carbon and silicon negative pole material used for a lithium ion battery. The inner side of the negative pole material is of a hollow structure, and a wall layer of the negative pole material comprises an inner wall and an outer wall; the inner wall is subjected to homogeneous phase compounding by nanometer silicon and a low carbon residue carbon source; the outer wall is a carbon coating layer formed by an original pyrolysis carbon source; the particle size of the nanometer silicon is 5-300nm; the softening point of the low carbon residue carbon source is less than 200DEG C, and a carbon residue rate is less than 40%; the thickness of the outer wall is 0.1-10 microns; thethickness of the inner wall is 1-8 microns. The invention designs the large hollow-structure carbon and silicon negative pole material used for the lithium ion battery, a large hollow part is reservedfor the volume expansion of silicon, the volume expansion problem of a silicon negative pole can be obviously solved, the formation of the large hollow structure is guaranteed by the low carbon residue carbon source, meanwhile, the nanometer silicon is subjected to homogeneous phase dispersion, a transmission channel and rate of electrons and lithium ions can be guaranteed, and the carbon coatinglayer coats the outmost layer so as to form a protection shell for isolating electrolyte.
Owner:MAANSHAN KEDA PURUI ENERGY TECH CO LTD

Lithium-ion battery cathode material with long service life and high power as well as preparation method thereof

The invention relates to a novel energy storage device and a preparation method of a spinel lithium titanate/carbon composite material of a lithium-ion battery cathode material with long service life and high power. The lithium titanate/carbon composite material is prepared by adopting a sol-gel method and taking inorganic lithium salts and tetrabutyl titanate as materials and carbon black as a carbon source. The prepared lithium titanate/carbon composite material has small particles and even particle size distribution and shows excellent large-rate capability and cycling performance as the cathode of a lithium-ion battery with long service life and high power. When the lithium titanate/carbon composite material and metallic lithium form a half-cell, the first specific capacity of the half-cell can still reach 108.9mAh/g in the 60C discharging process, and the capacity retention ratio of the half-cell after 2000 cycles is 75.9 percent. When the lithium titanate/carbon composite material and spinel lithium manganite form the lithium-ion battery and the current density reaches 1A/g (about 60C multiplying power), the discharge capacity can still reach 85 percent of discharge capacity when the current density reaches 60mA/g. Therefore, the invention has wide application potential in the lithium-ion battery with long service life and high power.
Owner:CSI CELLS CO LTD

A double-layer coated core-shell negative electrode material for lithium ion battery and a preparation method thereof

The invention discloses a double-layer coated core-shell negative electrode material for lithium ion battery and a preparation method thereof. A CVD deposition method is used for depositing nano silicon on that graphite particle to obtain a precursor of a negative electrode material; The titanium dioxide, the lithium carbonate and the organic pyrolysis carbon source are dispersed in an organic solvent to prepare a gel; the precursor of anode material was added into the gel, and the core-shell structure anode material was prepared by low temperature treatment, homogeneous dispersion and high temperature reaction. The core of double-layer coated core-shell negative electrode material for the lithium ion battery is nano silicon and graphite, the nano silicon is deposited on the surface of graphite particles, the outer shell is an organic pyrolytic carbon layer, and the inner shell is formed by attaching lithium titanate to the inner wall of the organic pyrolytic carbon layer. The core-shell negative electrode material has high capacity, high rate and excellent cycling performance, and the preparation process is simple, green and pollution-free, suitable for large-scale production.
Owner:MAANSHAN KEDA PURUI ENERGY TECH CO LTD

Cobalt nickel manganese lithium oxide-cooper oxide compound positive material for lithium ion battery and preparation method thereof

The invention discloses a cobalt nickel manganese lithium oxide-cooper oxide compound positive material for a lithium ion battery and a preparation method thereof. The compound positive material is obtained by coating cooper oxide on the surface of cobalt nickel manganese lithium oxide; and the chemical general formula of the compound positive material is LiCoxNiMn(1-x-y)O2 / CuO, wherein x is large than or equal to 0.2 and less than or equal to 0.4, and y is more than or equal to 0.3 and less than or equal to 0.7. The preparation method comprises the following steps: preparing cobalt nickel manganese lithium oxide ternary compound oxide lithium salt by a high temperature solid method; and then coating the copper oxide on the surface of the cobalt nickel manganese lithium oxide through high-temperature sintering so as to obtain the cobalt nickel manganese lithium oxide-cooper oxide compound positive material for the lithium ion battery. The material provided by the invention has the advantages of high specific capacity, good circulation characteristic, short production period and the like, is suitable for industrial production, and can be applied to the fields of electromobiles, energy storing equipment, electric power tools and the like.
Owner:HEFEI UNIV OF TECH

A kind of multi-component doped lithium phosphate cathode material and preparation method thereof, and lithium ion power battery

The invention relates to a multi-doped lithium phosphate anode material for a lithium ion power cell, LiFe1 minus x minus y Ti0.5x Mn0.1 minus y PO4 as base material is clad by a carbon material particle layer, the base material and the carbon material particle layer are combined to form composite particles, the composite particles are evenly dispersed in the conductive network of carbon materialparticles, wherein x / 2 plus y is larger than or equal to 0.03 and less than or equal to 0.10, x is larger than or equal to 0.02 and less than or equal to y, y is less than or equal to 0.08, organic carbon source compound is decomposed to produce C, and the added amount of the organic carbon source compound is 1 to 10 percent of the total weight of the base material; the average grain size of the composite particles is between 0.5Mu m and 5Mu m, and the diameter of the carbon material particle is between 5nm and 50nm; and the specific surface area of the composite particle is 12m<2> / g to 35m<2> / g. The anode material has the advantages of good high-rate performance, good product consistency and good cell processability, and the power cell adopting the material as anode material has the advantages of high safety performance, high rate performance and high cycle performance.
Owner:FIRST NEW ENERGY GRP CO LTD

Carbon-supported porous spherical MoN formed by nanosheets, and application of porous spherical MoN as negative material in lithium batteries

The invention relates to a carbon-supported porous spherical MoN lithium battery negative material formed by nanosheets. A preparation method of the material comprises the following steps: adding 0.1gof MoO2(acac)2, 0.2g of CH4N2S and 0.1g of glucose into 20ml of H2O and stirring for 1h, then placing in an oven at 200 DEG C for 12h, then taking out, centrifuging the product when the product is cooled to the room temperature, washing with ethanol and deionized water for a plurality of times, and placing in the oven at 70 DEG C to obtain a precursor of MoN; then, placing the obtained precursorin a tube furnace, and calcining for 4h at 800 DEG C in an ammonia atmosphere to obtain the carbon-supported porous spherical MoN material formed by the nanosheets. The prepared spherical MoN nanosheets having sizes of 500nm have good cycle stability and high rate performance as negative electrodes of lithium ion batteries, and has a specific capacity of 600mAh / g after 400 cycles of charge and discharge when the current density is 1A.
Owner:FUZHOU UNIVERSITY

Metal doped and Mxene coated double modified lithium iron phosphate composite material, and preparationmethodand application

The invention discloses a preparation method of a metal doped and Mxene coated double modified lithium iron phosphate composite material. The preparationmethod comprises the following steps that S1, alithium iron phosphate / Mxene precursor is prepared, specifically, an iron salt solution, a phosphoric acid or a salt solution thereof and a lithium salt solution are sequentially placed in a reactionkettle, the Mxene is added after stirring evenly, the pH of a solution is adjusted to 7-10, after protective gas is introduced for reaction, cooling is conducted to the room temperature, and a precursor product is obtained by centrifugal separation and drying; and S2, the precursor product of the step 1 is placed in a high-temperature furnace, sintering is conducted at high temperature in an inert atmosphere, and cooling is conducted to the room temperature to obtain the metal doped and Mxene coated double modified lithium iron phosphate composite material. Double modifying is conducted on the lithium iron phosphate through doping and Mxene surface coating, the conductivity of an electrode material is effectively improved, and the prepared composite material shows excellent large-rate performance and cycle performance.
Owner:GUANGDONG DONGDAO NEW ENERGY +1

B and N co-doped graphene coated silicon nano negative electrode material and preparation method thereof

The invention discloses a B and N co-doped graphene coated silicon nano negative electrode material and a preparation method thereof. The negative electrode material is prepared from B and N co-dopedgraphene coated silicon nano particles. The preparation method comprises the following steps: (1) adding graphene oxide powder into water, and carrying out ultrasonic dispersion to obtain a graphene oxide aqueous dispersion; (2) adding silicon nanoparticles and a nitrogen source into the graphene oxide aqueous dispersion, carrying out primary ultrasonic dispersion, adding a boron source, carryingout secondary ultrasonic dispersion, and carrying out freeze drying to obtain a B and N-containing graphene oxide coated silicon nano composite material; and (3) in an inert atmosphere, carrying out heat treatment on the B and N-containing graphene oxide coated silicon nano composite material, washing with water, and drying to obtain the material. The battery assembled by the negative electrode material well solves the problem that the volume of the silicon negative electrode material is sharply expanded in the charging and discharging process and is good in cycle performance and high-rate electrochemical performance and low in cost; and the method is simple in process and suitable for industrial production.
Owner:CENT SOUTH UNIV

Preparation method for improving potential of lithium ion battery positive electrode material LiCoO2

The invention discloses a preparation method for improving the potential of a lithium ion battery positive electrode material LiCoO2. The method comprises the following steps: mixing cobaltosic oxide with a lithium salt, adding an additive T1, preprocessing above mixed materials, carrying out high-temperature primary sintering on the above obtained preprocessed uniformly-mixed materials, carrying out surface treatment on the obtained sintered material, carrying out secondary mixing after the treatment ends, preprocessing the secondary mixed material, carrying out low-temperature secondary sintering, and carrying out surface treatment to obtain a product. Lithium cobaltate produced through the preparation method for improving the potential of the lithium ion battery positive electrode material has original properties, and also realize 4.4 v charge and discharge; the material is processed to form a final battery undergoing test, the test current rate is 0.2 C, the discharge voltage range is 3.0-4.35 V, the specific capacity of the tested material is greater than 160 mAh / g, and the capacity retention ratio is 99.5% or above after cycling 1 C charge / 1 C discharge 10 times; and the preparation method has good economic and social benefits, and is suitable for being promoted and used.
Owner:TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD

Method of using zeolite template to prepare porous carbon

The invention relates to the technical field of application and preparation of functional materials, in particular to a method of using a zeolite template to prepare porous carbon, comprising the steps of preparing a carbon / template composite with zeolite; preparing porous carbon with the prepared carbon / template composite. A template is made with natural zeolite to prepare medium- and large-poretemplate carbon with wide particle size distribution. The template carbon has specific surface area of 41 lm<2> / g and medium-pore rate of 66%; in H2SO4 medium, the template carbon has good high-rate performance; in case of scanning speed of 1 mV / s, the template carbon has specific capacity of 185 F / g; when the scanning speed is increased to 500 mV / s, the specific capacity is still 133 F / g, the capacity retention ratio is 72%, and a good scanning curve is maintained.
Owner:SHAANXI SHENGMAI PETROLEUM
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