Pre-oxidized ternary precursor for positive electrode material and preparation method of pre-oxidized ternary precursor

A technology for pre-oxidizing ternary and cathode materials, applied in chemical instruments and methods, inorganic chemistry, nickel compounds, etc., can solve problems such as low metal content, and achieve the effect of increasing total metal content, improving cycle performance, and increasing production capacity

Pending Publication Date: 2021-03-09
南通金通储能动力新材料有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The invention provides a pre-oxidized ternary precursor for positi

Method used

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  • Pre-oxidized ternary precursor for positive electrode material and preparation method of pre-oxidized ternary precursor
  • Pre-oxidized ternary precursor for positive electrode material and preparation method of pre-oxidized ternary precursor
  • Pre-oxidized ternary precursor for positive electrode material and preparation method of pre-oxidized ternary precursor

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Example 1: A pre-oxidized ternary precursor for positive electrode materials and its preparation method

[0035] (1) Add 2 mol / L nickel-cobalt-manganese mixed sulfate solution and 2 mol / L ammonia solution in parallel flow at a constant speed. The ammonia solution contains tetraethylammonium hydroxide with a mass fraction of 1%, and at the same time Supply 8 mol / L sodium hydroxide solution to control the pH value of the process to be 11.5-12.0; nitrogen protection during the reaction, stirring speed at 500 rpm and reaction device temperature at about 50°C, control the reaction time to obtain D 50 Ni with 6.2µm and SPAN of 0.7 2+ 0.65 co 2+ 0.1 mn 2+ 0.25 (OH) 2 ;

[0036] (2) Aging the product obtained in step (1) for 2 hours, centrifuging and washing with water 2-3 times;

[0037] (3) Put the product of step (2) into a hot air circulation drying oven, and calcine at a low temperature of 95°C for 2 hours to obtain a low-temperature calcined product;

[0038] (4)...

Embodiment 2

[0046] (1) Add a 2 mol / L nickel-cobalt-manganese mixed sulfate solution and a 2 mol / L ammonia solution in parallel flow at a uniform speed. The ammonia solution contains 0.5% tetraethylammonium hydroxide, and at the same time Supply 8 mol / L sodium hydroxide solution to control the pH value of the process to be 11.5-12.0; nitrogen protection during the reaction, stirring speed at 500 rpm and reaction device temperature at about 50°C, control the reaction time to obtain D 50 6.7 µm Ni with a SPAN of 0.81 2+ 0.65 co 2+ 0.1 mn 2+ 0.25 (OH) 2 ;

[0047] (2) Aging the product obtained in step (1) for 2 hours, centrifuging and washing with water 2-3 times;

[0048] (3) Put the product of step (2) into a hot air circulation drying oven, and calcine at a low temperature of 100°C for 2 hours to obtain a low-temperature calcined product;

[0049] (4) transferring the low-temperature calcined product obtained in step (3) to a calciner, and calcining at 500° C. for 5 hours to obtai...

Embodiment 3

[0055] (1) Add 2 mol / L nickel-cobalt-manganese mixed sulfate solution and 2 mol / L ammonia solution in parallel flow at a constant speed. The ammonia solution contains tetraethylammonium hydroxide with a mass fraction of 1%, and at the same time Supply 8 mol / L sodium hydroxide solution to control the pH value of the process to be 11.5-12.0; nitrogen protection during the reaction, stirring speed at 500 rpm and reaction device temperature at about 50°C, control the reaction time to obtain D 50 6.3µm Ni with a SPAN of 1.0 2+ 0.33 co 2+ 0.33 mn 2+ 0.33 (OH) 2 ;

[0056] (2) Aging the product obtained in step (1) for 2 hours, centrifuging and washing with water 2-3 times;

[0057] (3) Put the product of step (2) into a hot air circulation drying oven, and calcine at a low temperature of 105°C for 2 hours to obtain a low-temperature calcined product;

[0058] (4) transferring the low-temperature calcined product obtained in step (3) to a calciner, and calcining at 534° C. fo...

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Abstract

A pre-oxidized ternary precursor for a positive electrode material has a general formula of Ni1-x-yCoxMnyO, and x + y is more than or equal to 0.3 and less than or equal to 0.66. The preparation method comprises the following steps: (1) preparing a nickel-cobalt-manganese soluble salt mixed aqueous solution according to a molar ratio recorded in a general formula; preparing an ammonia water solution, wherein the ammonia water solution contains tetraethylammonium hydroxide with the mass fraction of 0.1%-1%; and adding the nickel-cobalt-manganese soluble salt mixed aqueous solution and the ammonia aqueous solution into a reactor in a nitrogen atmosphere in a uniform-speed parallel flow manner, adding a sodium hydroxide aqueous solution, controlling the pH value of a reaction system to be 11.5-12.0, keeping the reaction temperature at 45-60 DEG C, carrying out solid-liquid separation after the reaction is finished, and aging, washing, centrifuging and drying precipitates; (2) calcining the nickel-cobalt-manganese hydroxide at 90-110 DEG C to obtain a low-temperature calcined product; (3) continuously calcining the low-temperature calcined product at 450-550 DEG C for 1-5h to obtain nickel-cobalt-manganese oxide; and (4) washing and drying the nickel-cobalt-manganese oxide to obtain a pre-oxidized ternary precursor;.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium batteries, in particular to a pre-oxidized ternary precursor for positive electrode materials and a preparation method thereof. Background technique [0002] The main constituent materials of lithium-ion batteries include electrolyte, separator materials, positive and negative electrode materials, etc. Cathode material is a key component of lithium-ion batteries, and its performance directly affects the performance of lithium-ion batteries. [0003] At present, the positive electrode materials for lithium-ion batteries on the market are usually lithium cobalt oxide, lithium iron phosphate and ternary materials. However, the theoretical capacity of lithium iron phosphate is low, the conductivity is small, the cycle performance is poor, and the diffusion rate of lithium ions is slow, and the rate performance is poor; lithium cobalt oxide is the earliest positive electrode mat...

Claims

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Application Information

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IPC IPC(8): C01G53/00
CPCC01G53/006C01P2002/72C01P2004/03C01P2004/61C01P2006/11C01P2006/12
Inventor 李佰康张文静王梁梁朱用赵亮朱涛褚凤辉黄帅杰顾春芳
Owner 南通金通储能动力新材料有限公司
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