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Lithium ion positive electrode material and preparation method thereof

A cathode material, lithium ion technology, applied in the field of cathode active material of lithium ion battery and its electrochemical synthesis, can solve the problems of decreasing current efficiency, reducing the conductivity of electrolyte, accelerating the hydrolysis of transition metal ions, etc., and reducing the reaction diffusion path. Small size, shortened solid-phase reaction time, and high crystal phase purity

Inactive Publication Date: 2003-10-22
GUIZHOU ZHENHUA E CHEM INC
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Problems solved by technology

[0006] The electrolytic synthesis methods of these several metal oxides or hydrated oxides all use aqueous solution as the electrolyte solution, and there are the following problems: one, due to cobalt (II), cobalt (III), nickel (II), manganese (II), vanadium (III) The solubility product constant of the hydroxide, represented by the negative logarithm of the solubility product constant-lgKsp, is 14.2, 44.5, 15.2, 12.8, 34.3 respectively, and its hydroxide or metal oxide is very easy on the electrode surface A passivation layer is formed to reduce the current efficiency; 2. The corresponding colloidal particles of metal hydroxide or metal oxide are directly formed in the electrolysis device, which will reduce the conductivity of the electrolyte, and it is necessary to continuously adjust the pH value and conductivity of the electrolyte , to ensure that the electrolysis is carried out under stable conditions, constant current and plate voltage; 3. The electrolysis process releases heat. The temperature of the electrolyte in the electrolytic cell is generally in the range of 40 ° C to 70 ° C, which will accelerate the hydrolysis of transition metal ions

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  • Lithium ion positive electrode material and preparation method thereof
  • Lithium ion positive electrode material and preparation method thereof

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preparation example Construction

[0040] The preparation method of the above-mentioned material comprises the following steps: (1) directly electrolyzing the metal in an alcohol solution containing an organic additive to form a corresponding metal alkoxide with a general formula of R-O-M. Wherein R is an alkyl group, an alkoxy group or an aromatic hydrocarbon group, and M is at least one metal element in IIIB~VIIB, VIII, IIIA, and IVA in the periodic table of elements;

[0041] (1) Mix a metal alkoxide with an aqueous solution of an alkali metal compound containing an additive to form a sol precursor xA 2 O·yM 2 o m ·zH 2 O;

[0042] (2) The sol precursor is desolvated at 120°C to 550°C to form a powdery precursor of the positive electrode material xA 2 O·yM 2 o m ;

[0043] (3) The powdery precursor is subjected to a solid-state reaction at 450° C. to 960° C. for 0.5 to 48 hours in an oxygen-free or oxygen-free atmosphere to obtain the target product.

[0044] The method for preparing lithium-ion cath...

Embodiment 1

[0084] The cobalt block with a content of 99.7% is used as the anode, produced by Jinchuan Nonferrous Metallurgy Co., Ltd., the cathode is made of high-quality stainless steel, the brand is 310S, produced in Switzerland, and the AR absolute alcohol solution of AR lithium bromide is used as the electrolyte. Inter-voltage 5.5V, current density 1.0A / cm 2 . The area of ​​the cobalt block immersed in the electrolyte is 2.5cm 2 , after electrolysis for 100 minutes, an electrolyte solution containing 10.6 grams of cobalt ethoxide was obtained. 30 ml of battery-grade LiOH and AR polyethylene glycol, a mixed aqueous solution with a degree of polymerization of 1000, containing 2.9 grams of anhydrous lithium hydroxide and 10 grams of polyethylene glycol, were added dropwise to the solution containing For the electrolyte of cobalt alcohol, put the sol separated from the centrifuge model TGL-16C, manufactured by Shanghai Anting Scientific Instrument Factory, into a corundum crucible, and...

Embodiment 2

[0085] The cobalt block with a content of 99.7% is used as the anode, produced by Jinchuan Nonferrous Metallurgy Co., Ltd., the cathode is made of high-quality stainless steel, the brand is 310S, produced in Switzerland, the AR absolute ethanol solution of AR sodium bromide is used as the electrolyte, and the dosage is 100.0ml, which contains 2.0 grams of NaBr , inter-electrode voltage 6.5V, current density 1.0A / cm 2 . The area of ​​the cobalt block immersed in the electrolyte is 2.5cm 2, after electrolysis for 100 min, an electrolyte solution containing 10.6 g of cobalt ethoxide was obtained. 30.0 ml of battery-grade LiOH and AR polyethylene glycol, a mixed aqueous solution with a degree of polymerization of 1000, containing 2.9 grams of anhydrous lithium hydroxide and 10.0 grams of polyethylene glycol, were added dropwise to ethanol with stirring For the cobalt electrolyte, put the sol separated from the centrifuge model TGL-16C, manufactured by Shanghai Anting Scientific ...

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Abstract

This invention discloses a Li ion positive material and its preparation method solving the problem of reducing the circulation attenuation of the positive ionic material with the oxide general formula: xA2O.yM2Om.zN2On, the material is composed of 2-D hexagonal laminated crystal, compound oxide crystal of 3-D spinel structure or lithium vanadium oxide in the following processing steps: to electrolyse metal directly to form metal alkoxide in alcohol soluble absolute electrolyte containing organic additives then to mix with solution with assistant alkali salt or base to form positive sol precursor to dry to remove the solvent and form positive powder precursor under 120 to 550 deg.C. to process in solid phase reaction for 0.5-48h in 450-960 deg.c.

Description

technical field [0001] The invention relates to a positive electrode material for a lithium ion battery and a preparation method thereof, in particular to a positive electrode active material for a lithium ion battery and an electrochemical synthesis method thereof. Background of the invention [0002] As a positive electrode active intercalation material for lithium-ion batteries, the research and development hotspots mainly focus on Li x CoO 2 , Li x NiO 2 , Li x mn 2 o 4 , Li x V 2 o 5 , Li x V 3 o 8 , Li x V 6 o 13 , and its modified or doped derivatives, that is, LixCo formed by partially replacing Co, Ni, Mn and V in the above composite oxide with other metal elements 1-α m α o 2 , Li x Ni 1-α m α o 2 , where: 0<x<1.1, 0≤α≤1, M=Co, Ni, Mn, V, Al or Cr, etc., Li x mn 2-α m α o 4 , where: 0<x<1.1, 0≤α≤2, M=Co, Ni, V, Al or Cr, etc. Li x CoO 2 It is currently the best material in terms of comprehensive performance such as specific c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/00H01M4/02H01M4/04H01M4/48H01M4/50H01M4/52H01M4/58
CPCY02E60/122H01M4/525H01M4/1391H01M4/505Y02E60/10
Inventor 成弘向黔新
Owner GUIZHOU ZHENHUA E CHEM INC
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