Method for preparing lithium ion battery anode material nickle cobalt lithium manganate

A technology of nickel-cobalt lithium manganese oxide and lithium-ion batteries, which is applied in the field of preparation of lithium-ion battery cathode materials, can solve problems such as difficulty in mixing materials uniformly, slow solid phase diffusion speed, and influence on practical applications, and achieve high tap density, The effect of excellent electrochemical performance

Active Publication Date: 2009-01-28
CHANGSHA RES INST OF MINING & METALLURGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of this method are as follows: firstly, due to the slow diffusion rate of the solid phase, it is difficult to mix the materials uniformly, and there are large differences in the structure and composition of the product, which makes it difficult to control the electrochemical performance; secondly, the bulk density of the synthesized powder material Low, the general tap density is only 1.6 ~ 1.8g/cm 3

Method used

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  • Method for preparing lithium ion battery anode material nickle cobalt lithium manganate
  • Method for preparing lithium ion battery anode material nickle cobalt lithium manganate

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Example 1 Take 5 mol each of nickel hydroxide, electrolytic manganese dioxide, and lithium cobaltate, and put them into a 10-liter hydrothermal kettle. Place 8 liters of lithium hydroxide solution in advance in the hydrothermal kettle, lithium ion concentration 25g / l. After heating to 250° C. for 5 hours, cooling to normal temperature, and filtering the washing slurry. After drying the slurry, analyze its Li / M (lithium and transition metal element molar ratio) to be 0.92. Lithium carbonate was supplemented to make Li / M 1.10, added to a ball mill, ground for 2 hours, and then roasted. The roasting system is as follows: heating up to 1020°C at a rate of 3°C / min for 10 hours, and cooling at a cooling rate of 3°C / min to obtain nickel-cobalt-lithium manganese oxide products. The resulting product shows that its phase is a layered structure through X-ray diffraction analysis; the tap density is 2.55g / cm 3 ; The product is made into R2016 button battery and tested, 0.5C cha...

Embodiment 2

[0028] Example 2 Take 5 mol each of nickel oxide, trimanganese tetraoxide, and lithium cobaltate, and add them into a 10-liter hydrothermal kettle. Place 8 liters of lithium hydroxide solution in advance in the hydrothermal kettle, lithium ion concentration 18g / l. After heating to 150° C. for 10 hours, cooling to normal temperature, and filtering the washing slurry. After drying the slurry, its Li / M was analyzed to be 0.93. Lithium carbonate was supplemented to make Li / M 1.08, added to a ball mill and ground for 2 hours, then roasted. The roasting system is as follows: heating up to 1000°C at a rate of 3°C / min for 15 hours, and cooling the material at a cooling rate of 3°C / min to obtain nickel-cobalt-lithium manganese oxide products. The resulting product shows that its phase is a layered structure through X-ray diffraction analysis; the tap density is 2.60g / cm 3 ; The product is made into R2016 button battery and tested, 0.5C charge and discharge, its initial discharge cap...

Embodiment 3

[0029] Example 3 Take 5 mol each of nickel hydroxide, trimanganese tetraoxide, and lithium cobaltate, and put them into a 10-liter hydrothermal kettle. Place 8 liters of lithium hydroxide solution in advance in the hydrothermal kettle, lithium ion concentration 30g / l. After heating to 130° C. for 18 hours, cooling to normal temperature, and filtering the washing slurry. After drying the slurry, analyze its Li / M to be 0.91. Lithium carbonate was supplemented to make Li / M 1.06, added to a ball mill and ground for 2 hours, then roasted. The roasting system is as follows: the temperature is raised to 1050°C at a speed of 5°C / min for 15 hours, and the material is cooled with the furnace to obtain nickel-cobalt-lithium manganese oxide products. The resulting product shows that its phase is a layered structure through X-ray diffraction analysis; the tap density is 2.58g / cm 3 ; The product is made into R2016 button battery and tested, 0.5C charge and discharge, its initial discharg...

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Abstract

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.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery, in particular to a preparation method of nickel cobalt lithium manganese oxide, a positive electrode material of a lithium ion battery. Background technique [0002] One of the key materials of lithium-ion batteries is the cathode material. The most widely used cathode material is LiCoO 2 (lithium cobaltate). However, due to the scarcity and high price of cobalt resources, and there are certain safety hazards during overcharging, LiCoO 2 The application in high-capacity batteries has been restricted. [0003] Nickel-cobalt lithium manganese oxide material is a new type of lithium-ion battery cathode material. Its typical representative is a ternary transition metal oxide cathode material composed of Ni, Co, and Mn in equal amounts. Its typical molecular formula for LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 . Because two-thirds (or more) of the cobalt in l...

Claims

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Application Information

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IPC IPC(8): H01M4/58C01G45/12H01M4/505H01M4/525
CPCY02E60/10
Inventor 习小明湛中魁张瑾瑾李普良徐舜
Owner CHANGSHA RES INST OF MINING & METALLURGY
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