Method for treatment on high-voltage Ni-Co-Mn ternary positive electrode material by surface drying method

A ternary material, dry processing technology, applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems of poor process controllability, impact on the capacity of ternary materials, complex process, etc., to achieve high batch stability, Taking into account the effect of recycling and reducing the amount of residual lithium

Inactive Publication Date: 2016-03-02
CAIHONG GRP ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, wet coating is the most widely used coating of ternary materials, but its process is complicated, high cost, poor process controllability, high requirements for coating equipment, and wet processing has an impact on the capacity of ternary materials , the degree of improvement in high temperature and safety is controversial in the industry; adopting a simple and effective coating method to solve the problem of surface instability of nickel-cobalt-manganese ternary materials has become a bottleneck in the lithium battery industry

Method used

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  • Method for treatment on high-voltage Ni-Co-Mn ternary positive electrode material by surface drying method
  • Method for treatment on high-voltage Ni-Co-Mn ternary positive electrode material by surface drying method
  • Method for treatment on high-voltage Ni-Co-Mn ternary positive electrode material by surface drying method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Step 1, preparation of highly dispersed nickel-cobalt-manganese ternary material matrix:

[0019] Mixing: sieve and disperse the lithium salt with 70 meshes, remove slag and mix with nickel-cobalt-manganese hydroxide at a molar ratio of 1.05:1, add it to a mixer with a speed of 500n / min, and mix thoroughly for 1.5 hours to obtain mixed cornstarch;

[0020] Sintering: Put the mixed raw powder into a crucible and compact it, and sinter it in an air sintering furnace with a temperature of 960°C for 8 hours, then lower the temperature to a furnace temperature ≤80°C, take out the powder, and carry out weak crushing, dispersion, and passing through a 300-mesh sieve in the drying room After treatment, a highly dispersed nickel-cobalt-manganese ternary material matrix can be obtained.

[0021] Step 2, dry surface coating treatment:

[0022] Mixing materials: highly dispersed nickel-cobalt-manganese ternary material matrix and coating agent A are weighed at a molar ratio of 1:...

Embodiment 2

[0025] Step 1, preparation of highly dispersed nickel-cobalt-manganese ternary material matrix:

[0026] Mixing: sieve and disperse the lithium salt with 100 meshes, remove slag and mix it with nickel-cobalt-manganese hydroxide at a molar ratio of 1.08:1, add it into a mixer with a rotation speed of 600n / min, and fully mix for 1 hour to obtain mixed cornstarch;

[0027] Sintering: Put the mixed raw powder into a crucible and compact it, and sinter it in an air sintering furnace at a temperature of 940°C for 12 hours, then lower the temperature to a furnace temperature ≤80°C, take out the powder, and carry out weak crushing, dispersion, and passing through 300 meshes in the drying room After sieve treatment, a highly dispersed nickel-cobalt-manganese ternary material matrix is ​​obtained.

[0028] Step 2, dry surface coating treatment:

[0029] Mixing: Highly dispersed nickel-cobalt-manganese ternary material matrix and coating agent A are weighed at a molar ratio of 1:0.03, ...

Embodiment 3

[0032] Step 1, preparation of highly dispersed nickel-cobalt-manganese ternary material matrix:

[0033] Mixing: sieve and disperse the lithium salt with a 150-mesh sieve, remove the slag and mix it with nickel-cobalt-manganese hydroxide at a molar ratio of 1.1:1, add it into a mixer with a rotation speed of 400n / min, and mix thoroughly for 2 hours to obtain mixed cornstarch;

[0034] Sintering: Put the mixed raw powder into a crucible and compact it, and sinter it in an air sintering furnace at a temperature of 910°C for 15 hours, then cool down to a temperature of ≤80°C, take out the powder, and carry out weak crushing, dispersion, and passing through 300 meshes in the drying room After sieve treatment, a highly dispersed nickel-cobalt-manganese ternary material matrix is ​​obtained.

[0035] Step 2, dry surface coating treatment:

[0036] Mixing: the highly dispersed nickel-cobalt-manganese ternary material matrix and the coating agent A are weighed in a molar ratio of 1:...

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Abstract

A method for treatment on a high-voltage Ni-Co-Mn ternary positive electrode material by a surface drying method comprises the following steps of firstly, sieving and dispersing a lithium salt, weighing and adding the lithium salt and a Ni-Co-Mn hydroxide into a blending mixer for mixing according to a mole ratio of (1.0-1.2):1, mixing the lithium salt and the Ni-Co-Mn hydroxide to obtain mixed raw powder; secondly, loading and compacting the mixed raw powder in a pot, carrying out sintering in a high-temperature air atmosphere, cooling until the tapping temperature is less than or equal to 80 DEG C, taking a powder body out, and carrying out weak breaking, dispersing and sieving on the powder body in a drying room to obtain a high-dispersion Ni-Co-Mn ternary material substrate; thirdly, weighing and adding the high-dispersion Ni-Co-Mn ternary material substrate and a cladding agent A into a grinding blending mixer for mixing according to a mole ratio of 1:(0.1-0.001), and allowing the high-dispersion Ni-Co-Mn ternary material substrate and the cladding agent to be in mixed contact, thereby obtaining a mixed material; loading the mixed material in the pot, cooling after sintering the mixed material in the high-temperature air atmosphere to a solid phase until the tapping temperature is less than or equal to 80 DEG C, taking the powder body out, and carrying out sieving to obtain the high-voltage Ni-Co-Mn ternary material. According to the method, the high-voltage Ni-Co-Mn ternary positive electrode material which has the characteristics of high capacity, high cycle, high temperature and favorable safety can be prepared.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for preparing a high-voltage nickel-cobalt-manganese ternary positive electrode material with a dry surface treatment. Background technique [0002] Nickel-cobalt-manganese (NCM) ternary materials have attracted extensive attention from researchers because of their high capacity, good safety, and low price. In order to meet the needs of high-energy batteries, researchers have proposed many modification ideas for the surface modification of high-voltage nickel-cobalt-manganese ternary materials. At present, wet coating is the most widely used coating of ternary materials, but its process is complicated, high cost, poor process controllability, high requirements for coating equipment, and wet processing has an impact on the capacity of ternary materials , The degree of improvement in high temperature and safety is controversial in the industry; the use of si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 王慧萍李春春张斌虎
Owner CAIHONG GRP ELECTRONICS CO LTD
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