294 results about "Lyonium ion" patented technology

The invention discloses a manganese/lithium phosphate of lithium iron battery positive pole material and a production method thereof, the technical issue to be solved is to improve electrochemical performances of the positive pole material. The material of the invention includes substrates of manganese/lithium phosphate which are covered by a carbon material covering layer, the lithium covering the manganese/lithium phosphate behind the carbon material covering layer is spherical and has microscopic characteristics of being near spherical, rhombic, tapered, tabular, layered or/and block-shaped as well as of having 0.5-30 mum long and short axles. The production method comprises the following steps of: production of nanometer particles, liquid phase mixed reaction, production of precursor, sintering treatment, covering organic substances. Compared with the prior art, the invention improves the electron conductivity of the manganese/lithium phosphate by covering with carbon liquid phase, the carbon sufficiently covers active materials to efficiently prevent particle aggregation, the invention has the characteristics of about 4V of discharge voltage, high discharge and charge capacitance, excellent circulation stability, high safety, simple process, low cost and little influence on the environment.

A lithium ion conductive material that excels in mechanical strength, exhibiting high ion conductivity; a bacterial cellulose composite material having an inorganic material and/or organic material incorporated therein; and a bacterial cellulose aerogel. The water of bacterial cellulose hydrogel is replaced by a nonaqueous solvent containing a lithium compound. Bacterial cellulose producing bacteria are grown in a culture medium having an inorganic material and/or organic material added thereto. The bacterial cellulose hydrogel is dehydrated and dried.

The present invention belongs to the field of electrochemical power source material preparing technology, and is especially preparation process of oxygen place doped lithium ferric phosphate powder. The oxygen place doped lithium ferric phosphate as positive pole material in lithium ion cell has the molecular expression LiFeP(MxO4-x), and is prepared through mixing the dopant and the mother body material and sintering the mixture, or through solid phase reaction of the dopant and the mother body material. The preparation process has effective doping in the oxygen place of mother body material and the prepared material can raise the capacity and the circular discharge performance of the cell effectively and thus can find its wide application as positive pole material in secondary lithium ion cell and power cell.

A composite-coated lithium iron phosphate in a three-dimensional nanonetwork layered structure and a preparation method therefor, and a lithium ion battery, wherein a composite is prepared by compounding a conducting polymer, graphene and a carbon nano tube. The preparation method for the coated lithium iron phosphate comprises the following steps: doping the composite and anhydrous ferric phosphate in situ in the process of preparing the anhydrous ferric phosphate, serving as a lithium iron phosphate precursor, then mixing the composite in-situ doped anhydrous ferric phosphate, a lithium source, a traditional carbon material and a solvent to obtain slurry, spray drying the slurry, and calcining to obtain the composite-coated lithium iron phosphate in a three-dimensional nanonetwork layered structure. The preparation method is simple and has a wide raw material source, low cost and very broad practical application prospect. Serving as an anode material of the lithium ion battery, the coated lithium iron phosphate has higher electrical conductivity and cycling stability, and more excellent comprehensive electrochemical performance.

A process for recovering Li from used Li-ion battery by ion sieve includes dissolving the Li-ion battery in acid, adsorbing the Li ions by lambda-MnO2 ion sieve, and eluting Li ions out by diluted hydrochloric acid solution. Its advantages are high recovery yield and purity, and environmentally friendly.

The invention relates to a method for preparing a LiCoxNiyMnzO2 anode material for a lithium ion battery. The method comprises the following steps that soluble salts of nickel, cobalt and manganese undergo coprecipitation to prepare composite carbonate of nickel, manganese and cobalt; then, the carbonate is reacted with lithium hydroxide; moreover, when the carbonate is converted into hydroxide, lithium is deposited on the surface of the prior particles containing nickel, cobalt and manganese in the form of lithium carbonate. In this way, even mixing of lithium and elements such as nickel, cobalt and manganese is realized to obtain a top-quality precursor for preparing the LiCoxNiyMnzO2 material; moreover, the precursor can be made into a LiCoxNiyMnzO2 product with excellent properties after twice sintering. The method has the advantages of simple and easily controlled technological process, low production cost of prepared product and stable and controllable product performance, and can be used in industrial production.

The invention discloses a polymer electrolyte based on vinylene carbonate and polyethylene (methyl) acrylate and a preparation method of the polymer electrolyte. The electrolyte is characterized in that a lithium salt is dispersed in a solid-state polymer matrix, the content of the lithium salt in the solid-state polymer matrix accounts for 5-50wt%, and the solid-state polymer matrix is a copolymer of the vinylene carbonate and the polyethylene (methyl) acrylate or a copolymer of the vinylene carbonate, the polyethylene (methyl) acrylate and a framework monomer. The solid-state polymer electrolyte is simple to prepare, is high in room-temperature conductivity and can be used as an electrolyte of a lithium ion battery.

The invention discloses a lithium vanadium phosphate anode material used in a lithium battery and a preparation method thereof, and solves the technical problem that can improve the electrical conductivity and high-rate discharge property of the anode material. The inventive anode material comprises a matrix coated outside with a conductive nano-composite material with a particle size of 5-50 Mu m and a specific surface area of 5-25m<2>/g. The inventive anode material is prepared by the following steps: wet-method superfine ball mill, liquid-phase mixture reaction, spray drying, pretreatment, calcinations treatment, coating with conductive composite material, and fusion. Compared with the prior art, the invention can synthesize lithium vanadium phosphate anode material by the secondary molding liquid phase method of nanoparticles, and the product purity is high, the particle agglomeration is efficiently prevented. The synthetic lithium vanadium phosphate anode material has a discharge voltage about 4V, three discharge voltage platform zones, higher charge/discharge capacity, excellent rate discharge capability and loop stability, and low cost; and is suitable for the industrial production.

The invention is a preparation method for lithium iron phosphate which is the anode material for lithium ion battery. The invention relates to a manufacturing method for electrode material, whose steps are composed of: directly mixing the organic trivalence malysite and lithium dihydrogen phosphate according to the mol ratio of Fe:Li:PO4 equals to 0.8 to 1.2:1:1, adding acetone in weight of two to five times of the said substance and milling it for two to twenty hours in globe mill; drying, smashing and pelleting the sizing agent after milling; compacting with surface pressing of 0.01 to 5Kg/cm3 and calcining for two to thirty hours under the temperature of 500 to 800 degrees centigrade. The lithium iron phosphate material product Thus is produced. The invention can get the finished product after one-time agglomeration, which is characterized in producing little gas during the agglomeration, having simple producing equipment, being able to stably and reliably produce lithium iron phosphate material in large scale and producing upstanding products in appearance with good conductivity and steady electrochemical character.

The invention discloses a composite anode material LiFePO4-Li3V2(PO4)3/C for lithium ion batteries and a preparation method for the composite anode material, wherein, the LiFePO4 and the Li3V2(PO4)3 of the complex chemical compound LiFePO4-Li3V2(PO4)3/C are stoichiometrie compounds; the substance quantity ratio of the LiFePO4 and the Li3V2(PO4)3 is that LiFePO4/ Li3V2(PO4)3 is equal to an 1/x, and the x is more than zero and less than or equal to 1; the LiOH®qH2O, Li2CO3 or CH3COOLi®q2H2O is mixed uniformly with FePO4, 4H2O,V2O5, NH4H2PO4 and the polyethylene glycol to be blended to be the rheological phase after being added with water, and an obtained rheological phase precursor is roasted in the inert atmosphere for three to twenty hours under the temperature of 600-800 DEG C, which produces the composite anode material LiFePO4-Li3V2 (PO4)3/C for lithium ion batteries. The prepared composite anode material for lithium ion batteries has the advantages of large capacity, high efficiency of charge-discharge, good cycle efficiency, good high-rate performance, which is suitable for industrial production.

The invention discloses a multi-element in-situ co-doped ternary material precursor as well as a preparation method and an application thereof. The chemical formula of the precursor is (NixCoyMnz)(1-a-c)MaNc(OH)(2+k), wherein x is larger than or equal to 1/3 and smaller than or equal to 0.9, y is larger than 0 and smaller than or equal to1/3, z is larger than 0 and smaller than or equal to 0.4, the sum of x, y and z is 1, a is larger than or equal to 0.0001 and smaller than or equal to 0.01, and c is larger than or equal to 0.0001 and smaller than or equal to 0.01; radius of a doped ion M is close to that of the lithium ion, and M is selected from one or more of Mg<2+>, Zn<2+>, Zr<4+>, Nb<5+>, Ta<4+>, In<3+>, Sc<3+>, Y<3+>, Ce<4+> and Gd<3+>; radius of a doped ion N is close to that of metal ions Mn and Co in the ternary material, and N is selected from one or more of Al<3+>, Ti<4+>, Ge<4+>, W<6+> and V<5+>. In the preparation process of the ternary material precursor, two kinds metalions with different radii are introduced in situ, so that the doped metal ions are uniformly distributed in a precursor phase, and uniform mixing on the atomic grade is realized. The two kinds of metal ions with different radii are doped in different positions, cell parameters have coordinated variation, so that not only can a lithium ion transmission channel be expanded, but also good lattice structure of the ternary material can be kept, and the ternary material with excellent electrochemical performance is obtained.

The invention discloses an ionic liquid mixed electrolyte for a lithium ion battery. The ionic liquid mixed electrolyte comprises lithium salt, ionic liquid and a non-aqueous organic solvent, wherein the lithium salt is one or mixture of two of lithium bis borate and lithium difluoroborate; cations in the ionic liquid are selected from one of imidazole cations, piperidine cations, pyridine cations, pyrrole cations, quaternary ammonium cations and quaternary phosphine cations; anions in the ionic liquid are selected from one of tetrafluoroborate radicals, hexafluorophate radicals, difluorosulfimide anions and diperfluoroalkylsulfimide anions; and the non-aqueous organic solvent is selected from any one or mixture of several of linear carbonate, cyclic carbonate, linear ether and cyclic ether. The ionic liquid mixed electrolyte is high in thermal stability, wide for an electrochemical stability window, high in conductivity, low in viscosity and good in compatibility with an anode material and a cathode material of the lithium ion battery at the same time.

The invention relates to a method for preparing lithium iron phosphate of an anode material of a lithium ion battery. The method synthesizes a reactive precursor under the liquid-phase condition and calcines the precursor at high temperature to prepare the lithium iron phosphate of the anode material of the lithium ion battery, and comprises the following steps: dissolving a lithium source, a phosphorus source compound and a doped element compound in deionized water; adjusting the pH value of the mixture between 2 and 4; and after carrying out sufficient reaction, adding the conductive organicprecursor and an iron source compound into the reacted mixture and stirring and mixing the obtained mixture evenly to obtain a mixture containing lithium, iron and phosphorus and doped metal elements, and then calcining the mixture to obtain the lithium iron phosphate of the anode material of the lithium ion battery. Compared with the prior art, the method has reasonable process and simple operation, well controls the chemical composition of the material and the shape and size of granules through simple process steps, improves the electrical conductivity and the lithium-ion diffusion rate ofthe material, greatly improves the magnification charge-discharge and cycle performance of the synthesized material, and is suitable for industrialized production.

The invention relates to a lithium anode material doped with phosphate ferrous iron, and relative preparation. Wherein, the product has common advantages of lithium battery, while its discharge capacity can reach 150mAh/g, the 500-circled capacity is over 90%, with low cost. The invention is characterized in that: its formula is LiFe0.99M0.01PO4/C; M is Cr, Zn, and Ca; the preparation comprises that (1) mixing and grinding lithium carbonate, ferrous salt, chromate salt, zinc salt, calcium salt, phosphorus source and glucose; (2), preheating the powder material in step (1) in inertia gas and low temperature; (3), grinding the material in step (2), under inertia gas, to be burnt, cooled and screened at 300-deal screen. The invention can be used in the anode of lithium battery.

Electrolytes, lithium ion cells and corresponding methods are provided, for extending the cycle life of fast charging lithium ion batteries. The electrolytes are based on fluoroethylene carbonate (FEC) and/or vinylene carbonate (VC) as the cyclic carbonate component, and possibly on ethyl acetate (EA) and/or ethyl methyl carbonate (EMC) as the linear component. Proposed electrolytes extend the cycle life by factors of two or more, as indicated by several complementary measurements.

The present invention provides a method for preparing ferrous lithium phosphate by using semi-wet method. Said method includes the following steps: in the compounds containing Li, Fe and P selecting one water-insoluble compound and others are water-soluble, placing the above-mentioned water-insoluble compound into the above-mentioned water-soluble compound solution to obtain a suspension; in said suspension Li content, Fe content and P content must be met with the following formula: [mLi+n(1-m)/n M]:Fe:qPO4=1:1:1(1), in formula (1) n is chemical valence of alloying element M, m is mole number of Li, (1-m)/n is mole number of alloying element M and P and q respectively are mole numbers of Fe and PO4; adding reduction electro-conductive additive, spraying and pyrolyzing suspension so as to obtain precursor powder, roasting said precursor powder and pulverizing to obtain the invented product.

The invention relates to the technical field of lithium-ion batteries, in particular to a high-voltage and high-compaction electrolyte for a lithium-ion battery and the lithium-ion battery employing the electrolyte. The electrolyte comprises a lithium salt, a non-aqueous organic solvent and an additive, wherein the additive comprises fluoroethylene carbonate, a nitrile compound and a compound with a structure shown in the formula I; R1, R2 and R3 in the formula I are independently selected from hydrogen, halogen, hydroxyl, amino, a sulfo group, nitryl, carboxyl, an aldehyde group and alkyl or alkoxy of which the carbon atom number is 1-3 respectively; R4 is selected from hydrogen, amino or alkyl of which the carbon atom number is 1-3; and n is selected from an arbitrary integer between 0 and 2. Compared with the prior art, the battery employing the electrolyte is excellent in infiltration effect and high in development capacity under the conditions of high voltage and high compaction and has excellent cycle performance and high-temperature storage performance through synergistic effects of the fluoroethylene carbonate, the nitrile compound and the compound with the structure shown in the formula I.

The invention discloses a preparation method of a lithium iron phosphate anode material with high conductivity of a lithium ion battery. A carbon nano-pipe is added into lithium iron phosphate which is mixed with a conductive agent and a polyvinylidene fluoride binder. The carbon nano-pipe goes through at least one of such treatments as ball milling, gas pretreatment, purification treatment, acidification treatment and esterification treatment, which can effectively improve the purity of the carbon nano-pipe and reduce surface energy and twisting degree of the carbon nano-pipe, and lead the carbon nano-pipe to be arranged in order and scattered in the lithium iron phosphate, and form a conductive network with very small volume resistivity to improve the conductivity of the lithium iron phosphate. The adoption of the carbon nano-pipe as the conductive agent causes that the lithium iron phosphate which is used as the anode material of the lithium ion second battery has relatively good charge and discharge capability with large rate.

The invention relates to a method for preparing a LiCoxNiyMnzO2 anode material for a lithium ion battery, belonging to the preparation technical filed of the anode material of the lithium ion battery. The method comprises the following steps that manganese compound, nickel compound, LiCoO2 and lithium hydroxide are taken as raw materials; a well precursor combined by lithium, manganese, cobalt and nickel is obtained through hydrothermal reaction; then, a lithium source is added in the precursor to obtain a precursor through grinding; and finally, LiCoxNiyMnzO2 with excellent properties is obtained after the precursor is baked once. The method has the advantages of simple and easily controlled technological process, low production cost of prepared product and stable and controllable product performance, and can be used in industrial production.

The invention discloses a cathode active substance and cathode used for a lithiumion secondary battery. In the cathode active substance used for the lithiumion secondary battery, a mixture of spherical or torispherical graphite, massive artificial graphite the particle length-width ratio of which is 1.0-3.0 and needle-like artificial graphite the particle length-width ratio of which is 1.0-4.0 is taken as a substrate; non-graphite carbon materials are cladded outside the mixed substrate; the cladding amount is 1-20% of the mass of the mixed substrate; the non-graphite carbon material is asphalt or resin; the gram specific capacity of the cathode active substance is 350-370mAh/g, the particle size is 4.0-45mu m, the specific surface area is 1.0-4.0m<2>/g, the compacted density of the powder body is 1.65-2.10g/cm<3>, and the layer space (d002) is 0.3354-0.3370nm. The cathode active substance provided by the invention has the beneficial effects of improving the conductivity performance of materials, ensuring the excellent multiplying power and circular stability of materials, and satisfying different high-end requirements, especially the requirements of electric automobiles (EV), hybrid electric vehicles (HEV) and batteries in the energy storage field.

The present invention provides a method for preparing ferrous lithium phosphate by using wet method. Said method includes the following steps: making required water-soluble compounds containing Li, Fe and P and containing alloying element M respectively be dissolved in water; stirring them and placing them into a reactor to obtain a suspension, in which the Li content, Fe content and P content must be met with the following formula: [mLi+n(1-m)/n M]; pFe:qPO4=1:1:1, in said formula n is chemical valence of alloying element M, m is mole number of Li, (1-m)/n is mole number of alloying element M and the P and q respectively are mole numbers of Fe and PO4; adding reduction electro-conductive additive, spray drying suspension, roasting and pulverizing so as to obtain the invented product.