Method for improving tap density of ternary nickel-cobalt-manganese cathode material for lithium-ion battery

A technology for lithium ion batteries and positive electrode materials, which is applied to battery electrodes, positive electrodes, electrical components, etc., can solve problems such as being unsuitable for large-scale industrial production, complex synthesis processes, etc. The effect of volume to capacity

Inactive Publication Date: 2016-04-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the method of increasing the volume specific energy of materials is generally to increase the tap density of the material particles themselves, and prepare spherical or spherical particles with high density, but the synthesis process is complicated and not suitable for large-scale industrial production.

Method used

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  • Method for improving tap density of ternary nickel-cobalt-manganese cathode material for lithium-ion battery
  • Method for improving tap density of ternary nickel-cobalt-manganese cathode material for lithium-ion battery

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specific Embodiment approach 1

[0017] Specific implementation mode 1: This implementation mode provides a method for increasing the tap density of the ternary nickel-cobalt-manganese positive electrode material for lithium-ion batteries. First, sieve commercialized ternary material precursors with different particle sizes, and then add lithium salt and mix evenly Post-baking to obtain ternary positive electrode materials with different particle sizes, and then mix ternary positive electrode materials with different particle sizes in a certain proportion and then perform secondary low-temperature roasting to obtain high tap density ternary nickel-cobalt-manganese positive electrode materials. The specific steps are as follows:

[0018] 1) The commercial ternary material precursor Ni 0.5 co 0.2 mn 0.3 (OH) 2 Sieve out particles with a particle size of 9 microns, 6 microns and 3 microns, respectively, add lithium carbonate with a molar excess of 7%, use ethanol as a dispersant, stir at high speed to form a s...

specific Embodiment approach 2

[0020] Specific embodiment 2: In this embodiment, a high tap density ternary nickel-cobalt-manganese positive electrode material is prepared according to the following steps:

[0021] 1) The commercial ternary material precursor Ni 0.6 co 0.2 mn 0.2 (OH) 2 Sieve out particles with a particle size of 11 microns, 7 microns and 2 microns, add lithium carbonate with a molar excess of 9% respectively, use ethanol as a dispersant, stir at high speed to form a suspension until evaporated to dryness, and then put it into a constant temperature box for 80 After drying the mixed powder at ℃ for 4 hours, the first high-temperature roasting is carried out, and the temperature is raised from room temperature to 600 ℃ at a rate of 5 ℃ / min, and the temperature is kept at a constant temperature for 6 hours. After cooling down for 2 hours, oxygen flow was started, and then it was naturally cooled to room temperature to prepare ternary nickel-cobalt-manganese cathode materials with particle ...

specific Embodiment approach 3

[0023] Specific embodiment three: In this embodiment, a high tap density ternary nickel-cobalt-manganese positive electrode material is prepared according to the following steps:

[0024] 1) The commercial ternary material precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 Sieve out particles with a particle size of 13 microns, 7 microns and 3 microns, add lithium carbonate with a molar excess of 10% respectively, use ethanol as a dispersant, stir at high speed to form a suspension until evaporated to dryness, and then put it into a constant temperature box for 80 After drying the mixed powder at ℃ for 4 hours, the first high-temperature roasting is carried out, and the temperature is raised from room temperature to 600 ℃ at a rate of 5 ℃ / min, and the temperature is kept at a constant temperature for 6 hours. After cooling down for 2 hours, oxygen flow was started, and then naturally cooled to room temperature to prepare ternary nickel-cobalt-manganese cathode materials with particle si...

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Abstract

The invention discloses a method for improving tap density of a ternary nickel-cobalt-manganese cathode material for a lithium-ion battery. The method comprises the following steps: (1) screening ternary material precursors Ni<x>Co<y>Mn<z>(OH)<2> with large, medium and small particle sizes; (2) carrying out ball-milling wet-mixing roasting on the ternary material precursors screened in the step (1) and a lithium salt respectively, so as to obtain ternary nickel-cobalt-manganese cathode materials with large, medium and small particle sizes; and (3) mixing the ternary nickel-cobalt-manganese cathode material with the large particle size obtained in the step (2) with the ternary nickel-cobalt-manganese cathode materials with the medium and / or small particle sizes, and then carrying out secondary low-temperature roasting to obtain the ternary nickel-cobalt-manganese cathode material with high tap density. According to the method, the tap density and the volumetric specific energy of the ternary nickel-cobalt-manganese cathode material for the lithium-ion battery can be improved; the gram volume of the material is improved on the basis of ensuring the stability of the material in the cyclic process; and the rate capability is improved.

Description

technical field [0001] The invention relates to a preparation method of a ternary nickel-cobalt-manganese cathode material for a lithium-ion battery with high tap density. Background technique [0002] The ternary nickel-cobalt-manganese material for lithium-ion batteries is considered to be a positive electrode material for power lithium-ion batteries with development potential due to its high specific energy, stable structure, good safety performance, environmental friendliness, and lower cost than lithium cobalt oxide. The low volume-specific capacity and volume-specific energy of lithium-ion batteries is one of the bottlenecks currently limiting the application and development of lithium-ion batteries, which cannot meet the needs of consumers. The tap density of lithium-ion battery cathode materials is a key factor to determine whether it has high volume specific capacity and high volume specific energy. Therefore, improving the tap density of materials has become a tec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/131H01M10/0525
CPCH01M4/131H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 王振波张音聂敏刘宝生玉富达夏云飞顾大明
Owner HARBIN INST OF TECH
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