Preparation method of nickel-rich concentration gradient nickel-cobalt-manganese anode material with low acidity or alkalinity and high processability

A concentration gradient, cathode material technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of poor application, high pH, ​​wide application of unfavorable materials, etc., to achieve excellent performance, low pH, novel preparation process Effect

Inactive Publication Date: 2015-08-26
江苏东汛锂业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, nickel-cobalt-manganese lithium manganese oxide is generally prepared by solid-phase sintering after mixing nickel-cobalt-manganese oxide and lithium salt. It has a high pH and a pH value above 11.6. It is used in the processing of lithium-ion batteries such as pulping and coating. Poor, not conducive to the wide application of this material in lithium-ion batteries

Method used

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  • Preparation method of nickel-rich concentration gradient nickel-cobalt-manganese anode material with low acidity or alkalinity and high processability
  • Preparation method of nickel-rich concentration gradient nickel-cobalt-manganese anode material with low acidity or alkalinity and high processability
  • Preparation method of nickel-rich concentration gradient nickel-cobalt-manganese anode material with low acidity or alkalinity and high processability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Mix nickel-cobalt-manganese hydroxide (nickel: cobalt: manganese = 5:2:3) and lithium carbonate uniformly according to Li: M = 1.05, and heat at 850°C for 16 hours at a heating rate of 5°C / min , the airflow is controlled at 3 m 3 / h for the first sintering, cooling, ball milling, and Li 1.05 (Ni 0.5 co 0.2 mn 0.3 )O 2 Cathode material. Then carry out the first charge and discharge test, the first charge and discharge curve is shown in figure 1 , nickel cobalt lithium manganese oxide scanning electron imaging picture see figure 2 with image 3 .

Embodiment 2

[0021] Example 2: Mix nickel-cobalt-manganese hydroxide (nickel: cobalt: manganese = 5:2:3) and lithium carbonate uniformly according to Li: M = 1.05, and heat at 850 °C for 16 hours at a heating rate of 5 °C / min , the airflow is controlled at 3 m 3 / h for the first sintering, cooling, ball milling, and Li 1.05 (Ni 0.5 co 0.2 mn 0.3 )O 2 intermediate goods. Then the intermediate product and oxalic acid were uniformly mixed at a ratio of 1:0.2%, and kept at 300°C for 6 hours at a heating rate of 3°C / min, and the air flow was controlled at 5 m 3 / h for the second sintering, cooling, ball milling, and Li 1.05 (Ni 0.5 co 0.2 mn 0.3 )O 2 Cathode material. Then carry out the first charge and discharge test, the first charge and discharge curve is shown in figure 1 , nickel cobalt lithium manganese oxide scanning electron imaging picture see figure 2 with image 3 .

Embodiment 3

[0022] Example 3: Mix nickel-cobalt-manganese hydroxide (nickel: cobalt: manganese = 5:2:3) and lithium carbonate uniformly according to Li: M = 1.05, and heat at 850°C for 16 hours at a heating rate of 5°C / min , the airflow is controlled at 3 m 3 / h for the first sintering, cooling, ball milling, and Li 1.05 (Ni 0.5 co 0.2 mn 0.3 )O 2 intermediate goods. Then the intermediate product and oxalic acid were uniformly mixed at a ratio of 1:0.6%, and kept at 300°C for 6 hours at a heating rate of 3°C / min, and the air flow was controlled at 5 m 3 / h for the second sintering, cooling, ball milling, and Li 1.05 (Ni 0.5 co 0.2 mn 0.3 )O 2 Cathode material. Then carry out the first charge and discharge test, the first charge and discharge curve is shown in figure 1 , nickel cobalt lithium manganese oxide scanning electron imaging picture see figure 2 with image 3 .

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Abstract

The invention provides a preparation method of a nickel-rich concentration gradient nickel-cobalt-manganese anode material with low acidity or alkalinity and high processability. The preparation method comprises the following steps: firstly mixing a nickel-cobalt-manganese compound and a lithium compound in a proportion of Li to M being 1-1.1, performing first sintering under certain conditions of temperature, airflow and time, and then smashing and sieving a first sintering product to initially prepare and obtain a nickel-cobalt lithium manganate intermediate product; then uniformly mixing the intermediate product with an organic matter in a certain proportion, performing second sintering through a period of time under a certain temperature condition, and then smashing and sieving a second sintering product to obtain nickel-cobalt lithium manganate with low acidity or alkalinity and high processability. The material has the advantages of novel preparation technology and low acidity or alkalinity, and is high in processability.

Description

technical field [0001] The invention relates to a preparation method of a nickel-cobalt-manganese series cathode material with low pH and excellent processing and rich nickel concentration gradient. Background technique [0002] Lithium-ion batteries have the advantages of high energy, high voltage, good cycle performance, no memory effect, and environmental friendliness. They are widely used in various electronic products, power tools, and military fields. [0003] With the development of lithium-ion battery technology, the types of cathode materials for lithium-ion batteries are gradually increasing to meet the needs of different types of products. At present, it mainly includes: lithium cobalt oxide, lithium nickel cobalt manganate, lithium iron phosphate, lithium manganate and other lithium ion battery cathode materials. Due to the high production cost of lithium cobalt oxide, the negative impact on the environment, and the gradual depletion of cobalt ore resources, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 周发章叶城
Owner 江苏东汛锂业有限公司
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