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Preparation method of magnesium-doped lithium nickel cobalt oxide anode material for lithium ion battery

A technology for lithium-magnesium-nickel-cobaltate and lithium-ion batteries, which is applied in the field of preparation of high-density magnesium-nickel-nickel-cobaltate positive electrode materials for lithium-ion batteries, can solve the problems of complex process, high difficulty in industrialization, and large crystal size, and achieve The effect of simple process and low cost

Active Publication Date: 2012-04-11
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

Chinese patent document CN03112435.6 announced "the method for preparing lithium cobaltate lithium ion battery anode material with nano-cobalt tetroxide as raw material". This method is a traditional high-temperature solid-phase synthesis method. The material has a wide particle size distribution range, large crystal size, and poor electrochemical performance.
The Chinese patent document CN200810052730 announced "the preparation method of doped and surface-coated lithium nickel cobalt oxide", which replaces part of the cobalt which is expensive and has few resources with nickel which is cheap and has many resources, which has certain advantages. The production process adopts liquid The phase synthesis method is the liquid phase synthesis method that produces the precursor first, but this method has problems and shortcomings such as long production process, high cost, complicated process, high equipment requirements, high difficulty in industrialization, and sewage discharge.

Method used

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  • Preparation method of magnesium-doped lithium nickel cobalt oxide anode material for lithium ion battery
  • Preparation method of magnesium-doped lithium nickel cobalt oxide anode material for lithium ion battery
  • Preparation method of magnesium-doped lithium nickel cobalt oxide anode material for lithium ion battery

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Embodiment 1

[0032] (1) According to the ratio of Li:Ni:Co:Mg molar ratio of 1.01:0.8:0.15:0.05, weigh the reactant raw material LiOH·H with high purity 2 O, Ni(OH) 2 、Co 3 o 4 , MgO;

[0033] (2) The prepared raw materials are prepared according to the proportion: alcohol: water: zirconium ball = 1: 0.05: 2: 4 (wt%), and the wet ball milling is carried out for 10 hours, and the particle size of the mixed slurry is 0.5 ~1.5μm;

[0034] (3) Spray drying the mixed slurry;

[0035] (4) Put the dry material into a ceramic bowl, heat it in a tube furnace, and heat it up in an oxygen atmosphere of 1.5 atmospheres of oxygen pressure for preheating treatment. The heating rate is 15°C / min, and it is kept at 400°C. Pre-fired for 2 hours to obtain pre-fired material;

[0036] (5) Crush the pre-fired material to a particle size of 2-5 μm, add 0.5wt% PVA binder to the pre-fired material, at 1800kg / cm 3 Under pressure, pressed into a dense block;

[0037] (6) Put the compacted block into a ceramic...

Embodiment 2

[0041] (1) Weigh lithium carbonate, nickel carbonate, cobalt carbonate, and magnesium carbonate as reactant raw materials with higher purity according to the ratio of Li:Ni:Co:Mg molar ratio of 1.01:0.8:0.15:0.05;

[0042] (2) The prepared raw materials are proportioned as material: alcohol: zirconium balls = 1: 0.05: 2.5: 4 (wt%), wet ball milling for 12 hours, and the particle size of the mixed slurry is 0.5-1.5 μm;

[0043] (3) Spray drying the mixed slurry;

[0044] (4) Put the dry material into a ceramic bowl, heat it in a tube furnace, and heat it up in an oxygen atmosphere of 1.5 atmospheres of oxygen pressure for preheating treatment. The heating rate is 10°C / min, and it is kept at 450°C. Pre-fired for 2 hours to obtain pre-fired material;

[0045] (5) Crush the pre-fired material to a particle size of 2-5 μm, add 0.5wt% PVA binder to the pre-fired material, at 1800kg / cm 3 Under pressure, pressed into a dense block;

[0046] (6) Put the compacted block into the cer...

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Abstract

The invention belongs to the technical field of battery material preparation, and in particular relates to a preparation method of a magnesium-doped lithium nickel cobalt oxide anode material for a lithium ion battery. The preparation method comprises the following steps: proportionally preparing a Li source, a Ni source, a Co source and a Mg source, and mixing the materials by wet ball-milling to obtain blended slurry; spray-drying the blended slurry; preheating the dried material in a heat treatment atmosphere to obtain a pre-sintering material; pulverizing the pre-sintered material, adding a PVA (polyvinyl alcohol) binder, and compacting to obtain a dense block; heating the compacted block and performing heat preservation in the heat treatment atmosphere to obtain a sintered material; and finally cooling, pulverizing, and screening the sintered material to obtain the magnesium-doped lithium nickel cobalt oxide anode material. The magnesium-doped lithium nickel cobalt oxide anode material prepared by the method has the characteristics of uniform particle distribution, high capacity and high tap density. The preparation method has the advantages of simple process and low cost, thus being applicable to industrial production.

Description

technical field [0001] The invention belongs to the technical field of battery material preparation, and in particular relates to a method for preparing a high-density magnesium-nickel-nickel-cobaltate positive electrode material for a lithium-ion battery. Background technique [0002] LiCoO 2 It is the main cathode material for commercial lithium-ion batteries at present, but it has disadvantages such as expensive, not conducive to environmental protection, and low specific capacity. LiNiO 2 The positive electrode material doped with Co element also has LiNiO 2 The high discharge specific capacity of the material stabilizes the layered structure of the material and enhances the cycle stability of the material, but this material also has defects such as poor overcharge resistance, poor thermal stability, and high irreversible capacity for the first discharge. . In order to solve the above problems, so that nickel-cobalt materials can be applied to the commercial field as...

Claims

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Application Information

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IPC IPC(8): H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 朱伟包大新金江剑于洋栋王国光俞晓峰徐君陈文洪
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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