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Nickel-cobalt-manganese ternary precursor with stable granularity and preparation method and preparation device thereof

A nickel-cobalt-manganese ternary and precursor technology, applied in chemical instruments and methods, electrical components, nickel compounds, etc., can solve problems such as large particle size fluctuations and unstable control

Pending Publication Date: 2020-05-15
湖北容百锂电材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the technical defects of large particle size fluctuations and unstable control in the production of lithium battery cathode material precursors, and provide a nickel-cobalt-manganese ternary precursor with stable particle size and its preparation method and preparation device

Method used

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  • Nickel-cobalt-manganese ternary precursor with stable granularity and preparation method and preparation device thereof
  • Nickel-cobalt-manganese ternary precursor with stable granularity and preparation method and preparation device thereof
  • Nickel-cobalt-manganese ternary precursor with stable granularity and preparation method and preparation device thereof

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Embodiment 1

[0091] A method for preparing a nickel-cobalt-manganese ternary precursor with stable particle size, comprising the steps of:

[0092] (1) Preparatory conditions: within 5m 3 Add deionized water to the reactor to about 20cm below the overflow port, start stirring, add NaOH solution until the pH is 10.9-11.2, add ammonia water until the concentration of ammonia water in the system is 0.5-0.6mol / L, and feed nitrogen into the reactor. The flow rate of nitrogen is 5~10m 3 / h, while raising the temperature to 59.5~60.5℃;

[0093] (2) Start the machine to prepare 10 μm NCM811 precursor: After the above conditions are met, feed 8mol / L NaOH solution into the reactor, control the flow rate of NaOH to 56-61L / h, and the NaOH solution gradually diffuses in the aqueous solution in the reactor, The concentration is gradually diluted, and the NaOH solution before complete dilution forms a high pH environment, pH > 11.4; the fully diluted NaOH solution forms a low pH environment, with a pH ...

Embodiment 2

[0096] A method for preparing a nickel-cobalt-manganese ternary precursor with stable particle size, comprising the steps of:

[0097] (1) Preparatory conditions: within 5m 3 Add deionized water to the reaction kettle to about 20cm below the overflow port, start stirring, add NaOH solution until the pH is 11.3-11.6, add ammonia water until the ammonia concentration of the system is 0.3-0.4mol / L, and feed nitrogen into the reaction kettle. The flow rate of nitrogen is 5~10m 3 / h, while raising the temperature to 59.5~60.5℃;

[0098] (2) Start the machine to prepare 3 μm NCM811 precursor: After the above conditions are met, feed 8mol / L NaOH solution into the reactor, control the flow rate of NaOH to 58-62L / h, and the NaOH solution gradually diffuses in the aqueous solution in the reactor, The concentration is gradually diluted, and the NaOH solution before complete dilution forms a high pH environment, pH > 11.4; the fully diluted NaOH solution forms a low pH environment, with...

Embodiment 3

[0101] A method for preparing a nickel-cobalt-manganese ternary precursor with stable particle size, comprising the steps of:

[0102] (1) Preparatory conditions: within 5m 3 Add deionized water to the reactor to about 20cm below the overflow port, start stirring, add NaOH solution until the pH is 10.90-11.00, add ammonia water until the concentration of ammonia water in the system is 0.5-0.6mol / L, and feed nitrogen into the reactor. The flow rate of nitrogen is 5~10m 3 / h, while raising the temperature to 59.5~60.5℃;

[0103] (2) Start the machine to prepare 15 μm NCM9055 precursor: After the above conditions are met, feed 8mol / L NaOH solution into the reactor, control the NaOH flow rate to 55-60L / h, and the NaOH solution gradually diffuses in the aqueous solution in the reactor, The concentration is gradually diluted, and the NaOH solution before complete dilution forms a high pH environment, pH > 11.4; the fully diluted NaOH solution forms a low pH environment, with a pH ...

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Abstract

The invention discloses a nickel-cobalt-manganese ternary precursor with stable granularity and a preparation method and a preparation device of the nickel-cobalt-manganese ternary precursor. The preparation method comprises the following steps: (1) introducing deionized water into a reaction kettle; (2) introducing alkali liquor, wherein the alkali liquor before complete dilution forms a high-pHenvironment, and the alkali liquor after complete dilution forms a low-pH environment; (3) introducing a main material flow and a complexing agent into the low-pH environment to generate nickel-cobalt-manganese ternary precursor particles; and (4) when the particle size of the nickel-cobalt-manganese ternary precursor particles reaches a qualified range, introducing an auxiliary material flow intothe high-pH environment, maintaining the pH of the low-pH environment to be basically unchanged, reducing the flow rate of the auxiliary material flow if the granularity of the nickel-cobalt-manganese ternary precursor is continuously reduced, otherwise, increasing the flow rate of the auxiliary material flow, and finally preparing the nickel-cobalt-manganese ternary precursor with stable granularity. On the premise of controlling the pH in the reaction kettle to be stable, nucleation and growth of small particles in the reaction process are stably carried out at the same time, so that the purpose of stably controlling the particle size is achieved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a nickel-cobalt-manganese ternary precursor with stable particle size, a preparation method and a preparation device thereof. Background technique [0002] Lithium-ion batteries are widely used due to the advantages of high voltage, high specific capacity, and environmental protection. Lithium-ion batteries are mainly composed of positive electrode materials, negative electrode materials and electrolytes, and the positive electrode materials play a vital role in the performance of lithium-ion batteries. The cathode material precursor is extremely important to the performance of the cathode material. At present, the co-precipitation method is mainly used to produce precursors in China, including continuous method and batch method. The particle size of precursor affects key indicators such as tap density, compaction density and cycle performance of positive electrode...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 焦凯龙刘瑞倪湖炳朱珠
Owner 湖北容百锂电材料有限公司
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