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Method for preparing layered lithium, nickel, cobalt and manganese oxide anode material for lithium ion battery

A lithium-ion battery, lithium-nickel-cobalt-manganese technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of uneven mixing of various raw materials, low tap density of products, etc., and achieve easy large-scale industrial production and low cost. , to avoid the effect of complex processes

Active Publication Date: 2008-03-12
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the defect of the general high-temperature solid-phase method is that it is easy to cause uneven mixing of various raw materials. In order to improve the mixing effect, the commonly used method is to add solvents such as ethanol and ball milling. However, the result of adding solvents and ball milling often results in vibration of the product. Solid density is low

Method used

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  • Method for preparing layered lithium, nickel, cobalt and manganese oxide anode material for lithium ion battery
  • Method for preparing layered lithium, nickel, cobalt and manganese oxide anode material for lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Weigh LiOH.H 2 O2 2.53 g, Co 3 o 4 Put 20.07 grams, 9.43 grams of NiO and 6.94 grams of metal manganese powder into a ball mill, add 100 ml of absolute ethanol to soak, add 50 grams of agate balls, wet grind for 2 hours, take it out, filter, dry and put it into a corundum crucible , put it into a high-temperature furnace for sintering, raise the temperature to 1000°C at a heating rate of 3°C / min, keep it warm for 15 hours, cool down at a rate of 0.6°C / min, take it out, grind it, and pass through a 300-mesh sieve to obtain the final product. The XRD pattern of lithium nickel cobalt manganese oxide prepared by the method of Example 1 is shown in Figure 1a. The first charge and discharge curve of the lithium nickel cobalt manganese oxide synthesized by the method of Example 1 is shown in Fig. 2. In the charge and discharge curve in Fig. 2, the abscissa is the specific capacity, and the ordinate is the voltage. The charge and discharge voltage range of lithium nickel cob...

Embodiment 2

[0024] Weigh LiOH.H 2 O2 2.53 grams, metal Co powder 14.8 grams, Ni 2 o 3 10.19 grams and 6.94 grams of metal manganese powder, put them into a ball mill, add 100 ml of absolute ethanol to soak, add 60 grams of agate balls, wet mill for 3 hours, take them out, filter, dry them, put them into a corundum crucible, and put them into a high-temperature furnace Carry out sintering in the medium, heat up to 1150°C at a heating rate of 10°C / min, keep it warm for 20 hours, cool down at a rate of 2°C / min, take it out, grind it, and pass through a 300-mesh sieve to obtain the final product. The XRD pattern of the lithium nickel cobalt manganese oxide prepared in Example 2 is shown in Figure 1b.

Embodiment 3

[0026] Weigh LiOH.H 2 O2 2.53 g, Co 3 o 4 20.07 g, Ni 2 o 3 10.19 grams and 6.94 grams of metal manganese powder, put them into a ball mill, add 100 milliliters of absolute ethanol and water mixture to soak, add 40 grams of agate balls, wet mill for 5 hours, take them out, filter, dry and put them in a corundum crucible. Put it into a sintering furnace, heat up to 950°C at a heating rate of 4°C / min, keep it warm for 25 hours, cool down at a rate of 0.6°C / min, take it out, grind it, and pass through a 300-mesh sieve to obtain the final product. The XRD pattern of the lithium nickel cobalt manganese oxide prepared in Example 3 is shown in Figure 1c. The cycle curve of the lithium nickel cobalt manganese oxide synthesized by embodiment 3 is shown in Fig. 3, and in the cycle curve of the lithium nickel cobalt manganese oxide of Fig. 3, the abscissa is the number of cycles, and the ordinate is the specific capacity (mAh / g) .

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Abstract

The present invention relates to a method to prepare cathode material of layered lithium-nickel-cobalt-manganese oxide applied to lithium ion battery. The corresponding materials of metal manganese powers, compounds of lithium, metal cobalt or compounds of cobalt and compounds of nickel are weighted according to the molar ratio expressed and required in the chemical formula LiyNixCo1-2xMnxO2. In the formula, x is more than zero but less than 0.5 and y is more than or equal to 0.9 but less than 1.1; a solvent is added in the materials for wetmilling; and to be dried after wetmilling; then the materials is sintered under high temperature and then to be grinded to acquire the cathode material of layered lithium-nickel-cobalt-manganese oxide. The present invention has the advantages that a wetmilling mixing method is adopted which improves the mixing effect of the materials; a solid phase method is adopted to compound which has the advantages of simple technics process and low cost and is suitable for Industrialized mass production and avoids the complex flows of the body of a wet method before preparation; the metal manganese powers are adopted to replace the traditional manganese compound as materials which greatly improves the tap density of products and can realize higher volume capacity.

Description

technical field [0001] The invention relates to a method for preparing a layered lithium-nickel-cobalt-manganese oxide cathode material for lithium-ion batteries, and belongs to the technical field of preparation of cathode materials for lithium-ion batteries. Background technique [0002] Since Sony developed commercial lithium-ion batteries in 1992, lithium-ion batteries have developed rapidly due to their significant characteristics such as large specific energy, light weight, and no memory effect. They are used in mobile phones, portable appliances, military equipment power supplies, and small satellite power supplies. It has been widely used in fields such as electric bicycles and electric vehicles. At present, lithium-ion battery cathode materials on the market are mainly lithium cobalt oxide, which has good electrochemical performance, but its low capacity, poor safety, high price and other problems have gradually emerged with the development of batteries, and there i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G1/02H01M4/48H01M4/505H01M4/525
CPCY02E60/12Y02E60/10
Inventor 卢世刚阚素荣王昌胤张向军金维华伍乐庞静刘莎
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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