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Preparation method of nano positive material for lithium ion battery

A lithium-ion battery and positive electrode material technology, applied in the field of nano-material preparation technology and green energy, can solve the problems of material composition inhomogeneity, long reaction time, complex preparation process, etc., achieve outstanding charge and discharge performance, and be easy to industrialize. , the effect of uniform particle size distribution

Inactive Publication Date: 2014-01-15
ADVANCED MFG TECH CENT CHINA ACAD OF MASCH SCI & TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 The material has broad development prospects, but its preparation process is complex and not suitable for industrial production, which limits its practical application
The commonly used solid-phase synthesis method has simple operation steps, but the energy consumption is large, the reaction time is long, and the heterogeneity of the synthesized material components is not enough; although liquid-phase methods such as sol-gel method and precipitation method can synthesize components with uniform However, the calcination temperature of heat treatment is very high (over 900 ℃), and the calcination time is long, which makes the energy consumption of the preparation material large
At the same time, the low conductivity of the cathode material seriously affects its electrochemical performance under high current.

Method used

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  • Preparation method of nano positive material for lithium ion battery
  • Preparation method of nano positive material for lithium ion battery
  • Preparation method of nano positive material for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: Get 11.63 g nickel nitrate, 7.158 g manganese nitrate and 11.64 g cobalt nitrate, dissolve in deionized aqueous solution, the concentration of metal ion is 2 mol / L, add 0.5 g polypropylene glycol simultaneously, stir 0.5 with 800 rpm Hour. in N 2 Under the atmosphere, 0.08 mol aqueous solution containing lithium hydroxide and 0.08 mol urea aqueous solution were added dropwise to the above solution at the same time, and stirred at 800 rpm, the reaction temperature was kept at 45 °C, and the pH value of the reaction system was kept at 10. Stirring was continued for 2 hours after the precipitate formed. The formed precipitate and solution were transferred to a hydrothermal kettle with a filling degree of 70%. After reacting in a hydrothermal environment at 160 °C for 12 hours, the precipitate was taken out, filtered and cleaned, and the filter cake was dried to obtain the precursor nickel manganese cobalt oxide. The precursor was mixed with 2.76 g lithium n...

Embodiment 2

[0029] Embodiment 2: Get 9.95 g nickel acetate, 9.80 g manganese acetate and 9.96 g cobalt acetate and dissolve in deionized aqueous solution, the concentration of metal ion is 2 mol / L, add 1.5 g carbon nanotubes simultaneously, stir 0.6 with 1000 rpm Hour. in N 2 Under the atmosphere, 0.12 mol aqueous solution containing sodium hydroxide and 0.05 mol urea aqueous solution were added dropwise to the above solution at the same time, and stirred at 1200 rpm, the reaction temperature was kept at 40°C, and the pH value of the reaction system was kept at 11. Stirring was continued for 2 hours after the precipitate formed. The formed precipitate and solution were transferred to a hydrothermal kettle with a filling degree of 70%. After reacting in a hydrothermal environment at 150 °C for 16 hours, the precipitate was taken out, filtered and cleaned, and the filter cake was dried to obtain the precursor nickel manganese cobalt oxide. Mix the precursor with 4.08 g lithium acetate in ...

Embodiment 3

[0030] Example 3: Dissolve 17.06g of nickel oxalate, 19.06g of manganese oxalate, and 19.59g of cobalt oxalate in a deionized aqueous solution. The concentration of metal ions is 2 mol / L. At the same time, 0.7 g of corn stalks are added and stirred at 1000 rpm for 1 hour . in N 2 Under the atmosphere, 0.16 mol aqueous solution containing lithium hydroxide and 0.05 mol urea aqueous solution were added dropwise to the above solution at the same time, and stirred at 1100 rpm, the reaction temperature was kept at 45 °C, and the pH value of the reaction system was kept at 12. Stirring was continued for 2 hours after the precipitate formed. The formed precipitate and solution were transferred to a hydrothermal kettle with a filling degree of 85%. After reacting in a hydrothermal environment at 200 °C for 12 hours, the precipitate was taken out, filtered and cleaned, and the filter cake was dried to obtain the precursor nickel manganese cobalt oxide. Mix the precursor and 4.08 g li...

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Abstract

The invention belongs to the field of preparation techniques of nanophase materials and green energy resources, and relates to a preparation method of a nano positive material LiNi1 / 3Mn1 / 3Co1 / 3O2 applied to a lithium ion battery. By using the method, the defects that the calcining temperature needed by a current synthetic material is high, the calcining time is long, the particle sizes of a product are not uniform, and the like, are mainly solved. The preparation method comprises the following steps: adding a certain amount of template agent in a mixed aqueous solution of a nickel salt, a manganese salt and a cobalt salt, and then, dripping a precipitant and a complexing agent into the obtained mixture to form a precipitate; subjecting the precipitate and the mixed aqueous solution to a high-pressure thermal reaction in a hydrothermal kettle, cleaning and baking the obtained product to be dry, so as to obtain a nickel manganese cobalt oxide; and finally, uniformly mixing the nickel manganese cobalt oxide with the lithium salt to prepare a final product by calcining and cooling. By using the preparation method, the product with favorable electrochemical performance can be obtained within a shorter calcining time; the energy consumption is decreased; and the preparation method has obvious economic benefit in the large-scale application of industrial synthesis.

Description

technical field [0001] The invention belongs to the field of nanomaterial preparation technology and green energy, and relates to a nanoscale positive electrode material LiNi applied to lithium ion batteries 1 / 3 mn 1 / 3 co 1 / 3 o 2 method of preparation. Background technique [0002] The two major tasks of lithium-ion battery research are to improve performance (mainly high energy density and power density, long life, safety) and reduce cost. The cathode material is the key to improving the performance of lithium-ion batteries, which determines the main performance indicators of lithium-ion batteries. In terms of positive electrode materials in power lithium-ion secondary batteries, lithium cobalt oxide (LiCoO 2 ) There are problems such as thermal runaway risk and high cost of large batteries; lithium manganate (LiMn 2 o 4 ) has the advantages of low cost, environmental friendliness, and high safety, but it has low energy density, poor cycle performance, and prominent ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1391H01M4/525H01M4/505B82B3/00
CPCY02E60/122Y02E60/10
Inventor 王萌陈蕴博陈林左玲立谷亦杰牟锐张钊李青海林道勇
Owner ADVANCED MFG TECH CENT CHINA ACAD OF MASCH SCI & TECH
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