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Preparation method of high-nickel lithium ion battery positive electrode material

A technology for lithium-ion batteries and positive electrode materials, which can be applied to battery electrodes, positive electrodes, secondary batteries, etc., and can solve the problems that lithium carbonate cannot be used

Active Publication Date: 2021-07-06
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention aims to propose a kind of preparation method of high-nickel lithium-ion battery cathode material, to overcome the deficiencies in the prior art, reduce the melting and thermal decomposition temperature of lithium carbonate by developing a kind of mode of organic additive, improve A reactive method to solve the problem that lithium carbonate cannot be applied to the preparation of high-nickel ternary materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Prepare 20L of nickel-cobalt-manganese salt solution with a concentration of 2M, the molar ratio of nickel-cobalt-manganese is 8.3:1.2:5, and 0.02mol% aluminum nitrate until completely dissolved. In the reaction kettle with nitrogen protection at the bottom, the rotation speed is 600rpm, and the prepared salt solution is added at a constant speed of 1L / h. At the same time, the pH value is controlled at 10.6±0.02 with the sodium hydroxide solution added with ammonia water until the salt solution is completely injected. After solid-liquid separation, the 811 precursor can be obtained after drying at 100°C for 4 hours.

[0020] Add methylcellulose: acrylamide: methyl formate (mass ratio 3:1:1) to a 1:1 solution of deionized water and absolute ethanol at a temperature of 60°C, and add 1‰ hydrogen peroxide. Continue stirring to evaporate the solvent and dry at 120°C for 4h. The dried solid particles are pulverized to obtain a powder with a median diameter of about 50um.

...

Embodiment 2

[0024] Prepare 20L of nickel-cobalt-manganese salt solution with a concentration of 2M, the molar ratio of nickel-cobalt-manganese is 7:1:2, and a mixture of 0.05mol% ammonium molybdate and magnesium nitrate (molar ratio of Mo metal to Mg is 1:1) until completely dissolved. In the reaction kettle with nitrogen protection at the bottom, the rotation speed is 600rpm, and the prepared salt solution is added at a constant speed of 1L / h. At the same time, the pH value is controlled at 11±0.02 with the sodium hydroxide solution added with ammonia water until the salt solution is completely injected. After solid-liquid separation, the 712 precursor can be obtained after drying at 100°C for 4 hours.

[0025] Add methylcellulose: acrylamide: methyl formate (mass ratio 3:1:1) to a 1:1 solution of deionized water and absolute ethanol at a temperature of 60°C, and add 1‰ hydrogen peroxide. Continue stirring to evaporate the solvent and dry at 120°C for 4h. The dried solid particles are p...

Embodiment 3

[0029]Prepare 20L of nickel-cobalt-manganese salt solution with a concentration of 2M, the molar ratio of nickel-cobalt-manganese is 7.5:0.5:2, and a mixture of 0.05mol% ammonium molybdate and strontium nitrate (molar ratio of Mo to Sr is 1:2) until completely dissolved. In the reaction kettle with nitrogen protection at the bottom, the rotation speed is 600rpm, and the prepared salt solution is added at a constant speed of 1L / h. At the same time, the pH value is controlled at 11±0.02 with the sodium hydroxide solution added with ammonia water until the salt solution is completely injected. After solid-liquid separation, the 7505 precursor can be obtained after drying at 100°C for 4 hours.

[0030] Add methylcellulose: acrylamide: methyl formate (mass ratio 3:1:1) to a 1:1 solution of deionized water and absolute ethanol at a temperature of 60°C, and add 1‰ hydrogen peroxide. Continue stirring to evaporate the solvent and dry at 120°C for 4h. The dried solid particles are pul...

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PUM

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Abstract

The invention provides a preparation method of a high-nickel lithium ion battery positive electrode material, and aims to overcome the defect that lithium carbonate cannot be applied to preparation of a high-nickel ternary material by a method for reducing melting and thermal decomposition temperatures of lithium carbonate and improving reaction activity in a manner of developing an organic additive. According to the method, the process difficulty of the high-nickel lithium carbonate is greatly reduced under the condition of high nickel (Ni mol% is more than or equal to 60% and less than or equal to 98%), and meanwhile, the cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion positive electrode materials, and in particular relates to a preparation method of high-nickel lithium-ion battery positive electrode materials. Background technique [0002] Nickel-cobalt lithium manganate multi-component positive electrode material is a new high-capacity lithium-ion battery positive electrode material. Generally, nickel is the main electrochemically active material, cobalt can reduce the electrochemical polarization of the material and increase the rate, and manganese can improve structural stability and thermal stability. Therefore, the synergistic effect of two or three elements in nickel-cobalt-manganese makes the multi-component positive electrode material have good structural stability and comprehensive electrochemical performance, and has certain advantages in safety performance, cycle performance and cost. The material has good safety performance. , the price is relat...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006H01M4/505H01M4/525H01M10/0525C01P2006/40H01M2004/021H01M2004/028Y02E60/10
Inventor 郭建
Owner TIANJIN ENERGIES
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