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Method for preparing single crystal morphology nickel cobalt manganese lithium ion battery cathode material

A technology of nickel-cobalt-manganese-lithium and ion batteries, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low single crystal degree of secondary particles and affect the electrochemical performance of positive electrode materials, and achieve high single crystal degree, The effect of reducing the loss of lithium source and better electrochemical performance

Inactive Publication Date: 2018-08-28
淮安新能源材料技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the secondary particles of single crystal ternary cathode materials prepared by many methods have low single crystallinity, and many of them are formed by agglomeration of primary particles, which seriously affects the electrochemical performance of cathode materials.

Method used

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  • Method for preparing single crystal morphology nickel cobalt manganese lithium ion battery cathode material
  • Method for preparing single crystal morphology nickel cobalt manganese lithium ion battery cathode material
  • Method for preparing single crystal morphology nickel cobalt manganese lithium ion battery cathode material

Examples

Experimental program
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Effect test

example 1

[0026] 1. Synthesize the positive electrode material precursor by co-precipitation method, add 1 mol / l metal salt (nitrate) mixed solution, 3 mol / l sodium hydroxide solution, and 1 mol / l ammonia water into the reaction kettle dropwise, The ratio of nickel-cobalt-manganese elements in the solution is 5:2:3, the pH value of the control system is 9, water bath at 50°C for 12 hours, suction filtration, and vacuum drying at 120°C for 12 hours to obtain a precursor with a particle size distribution of D50=2-4um;

[0027] 2. Weigh 100g of the precursor in step 1, add boron oxide according to the mass percentage of the precursor at 0.2%, add molten salt sodium chloride at a mass ratio of 1:1, and mix evenly; keep warm at 500°C under the air atmosphere of the muffle furnace 2h. After primary sintering, the material is washed, filtered, vacuum-dried at 60°C, and passed through a 300-mesh sieve;

[0028] 3. According to the Li / M molar ratio of 1.10, mix the lithium carbonate with the po...

example 2

[0031] 1. Synthesize the positive electrode material precursor by co-precipitation method, add 1 mol / l metal salt (nitrate) mixed solution, 3 mol / l sodium hydroxide solution, and 1 mol / l ammonia water into the reaction kettle dropwise, The ratio of nickel-cobalt-manganese elements in the solution is 5:2:3, the pH value of the control system is 9, water bath at 50°C for 12 hours, suction filtration, and vacuum drying at 120°C for 12 hours to obtain a precursor with a particle size distribution of D50=2-4um;

[0032] 2. Weigh 100g of the precursor in step 1, add boron oxide according to the mass percentage of the precursor at 5.0%, add molten salt potassium chloride at a mass ratio of 5:1, and mix evenly; keep warm at 800°C in the air atmosphere of the muffle furnace 10h. After primary sintering, the material is washed, filtered, vacuum-dried at 60°C, and passed through a 300-mesh sieve;

[0033] 3. According to the Li / M molar ratio of 1.40, mix the lithium carbonate with the p...

example 3

[0036] 1. Synthesize the positive electrode material precursor by co-precipitation method, add 1 mol / l metal salt (nitrate) mixed solution, 3 mol / l sodium hydroxide solution, and 1 mol / l ammonia water into the reaction kettle dropwise, The ratio of nickel-cobalt-manganese elements in the solution is 5:2:3, the pH value of the control system is 9, water bath at 50°C for 12 hours, suction filtration, and vacuum drying at 120°C for 12 hours to obtain a precursor with a particle size distribution of D50=2-4um;

[0037] 2. Weigh 100g of the precursor in step 1, add boron oxide according to the mass percentage of the precursor at 2.5%, and add molten salt sodium chloride at a mass ratio of 2.5:1, and mix evenly; keep warm at 650°C in the air atmosphere of the muffle furnace 6h. After primary sintering, the material is washed, filtered, vacuum-dried at 60°C, and passed through a 300-mesh sieve;

[0038]3. According to the Li / M molar ratio of 1.25, mix the lithium carbonate with the ...

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Abstract

The invention discloses a method for preparing a single crystal morphology nickel cobalt manganese lithium ion battery cathode material. By simultaneously adding sintering aids, namely boric oxide andfused salt, a ternary cathode material which is relatively good in morphology and processing property and has single crystal morphology can be prepared. Scanning electron microscope testing shows that the ternary cathode material prepared by using the method is large in primary single crystal granule and high in single crystal degree, and a prepared single crystal ternary cathode material is goodin electrochemical property at a high voltage.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and more specifically relates to a preparation method of a single-crystal nickel-cobalt-manganese lithium-ion battery cathode material. Background technique [0002] Lithium-ion batteries are widely used in portable electronic products. With the popularization and progress of electronic products, the requirements for battery performance are getting higher and higher. At present, the specific capacity of the negative electrode material of lithium ion battery is much higher than that of the positive electrode material, so the positive electrode material is the bottleneck restricting the development of lithium ion battery. Lithium cobalt oxide (LiCoO 2 )’s 4.3V 0.1C theoretical charging specific capacity can reach 274mAh / g, but cobalt is expensive and highly toxic, and high energy density charging and discharging will reduce its capacity due to the collapse of the material structure, t...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 顾冬生周翔李明尹延谋卢鹏刘耀春张远刘清泉
Owner 淮安新能源材料技术研究院
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