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A kind of preparation method of germanium-coated lithium-ion battery ternary composite cathode material

A lithium-ion battery, ternary composite technology, applied in the direction of battery electrodes, electrical components, circuits, etc., can solve the problems of large positive electrode space, low compaction density, poor cycle performance, etc., to achieve enhanced overall performance and long service life , the effect of improving stability

Active Publication Date: 2015-11-25
山东毅聪新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such materials also have a series of insurmountable defects in practical applications.
First of all, the compaction density of this type of ternary material is low, only 3.6g / cm3, therefore, under the same capacity, the space occupied by the positive electrode sheet is relatively large, resulting in low space utilization inside the battery
Secondly, as a lithium battery cathode material, its cycle performance is poor, and it is difficult to meet the needs of higher lithium battery products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The chemical formula of the ternary composite cathode material prepared in this example is LiNi 0.56 Al 0.26 co 0.18 o 1.995 f 0.005 .

[0023] Nickel oxalate, aluminum oxalate, and cobalt oxalate are formulated into an aqueous solution according to the molar ratio of Ni:Al:Co=0.56:0.26:0.18, and the final concentration of all positive ions is a metal ion solution with a total concentration of 0.5mol / L; the prepared above-mentioned metal The ionic solution is added to the stirred reactor in an argon atmosphere, the stirring speed of the stirrer is 600rpm, and the heating temperature is controlled at 75°C; the KOH solution with a concentration of 0.1mol / L is dropped into the stirred reactor very slowly to generate Ni 0.56 Al 0.26 co 0.18 )(OH) 2 Precipitation, in the whole reaction process, the pH value of the reaction solution in the stirrer is controlled at 10; After the reaction finishes, the product is filtered, washed, and dried at 100 ° C to obtain granular ...

Embodiment 2

[0027] The chemical formula of the ternary composite cathode material prepared in this example is LiNi 0.46 Al 0.32 co 0.22 o 1.99 f 0.01 .

[0028] Nickel oxalate, aluminum oxalate, and cobalt oxalate are made into an aqueous solution according to the molar ratio of Ni:Al:Co=0.46:0.32:0.22, and the final concentration of all positive ions is a metal ion solution with a total concentration of 1mol / L; the prepared above-mentioned metal ions The solution was added into a stirred reactor in an argon atmosphere, the stirring speed of the stirrer was 800rpm, and the heating temperature was controlled at 90°C; the KOH solution with a concentration of 0.2mol / L was dropped into the stirred reactor very slowly to produce (Ni 0.46 Al 0.32 co 0.22 )(OH) 2Precipitate, in the whole reaction process, the pH value of the reaction solution in the stirrer is controlled at 12; 0.46 Al 0.32 co 0.22 )(OH) 2 Precursor.

[0029] Weigh the above precursor, lithium hydroxide and lithium f...

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Abstract

The invention relates to a preparation method for a ternary composite cathode material for a germanium-coated lithium ion battery. The chemical formula of the cathode material is LiNi1-x-yAlxCoyO2-zFz, wherein x is 0.26 to 0.32, y is 0.18 to 0.22, and z is 0.005 to 0.01. The method comprises the following steps: (1) preparing nickel oxalate, aluminum oxalate and cobalt oxalate into a mixed solution, adding argon into the prepared metal ion solution, stirring, heating, instilling a KOH solution into a stirred reactor very slowly to produce (Ni1-x-yAlxCoy)(OH)2 sedimentation, filtering, washing, and drying so as to obtain a granulous (Ni1-x-yAlxCoy)(OH)2 precursor; (2) respectively weighing the precursor, lithium hydroxide and lithium fluoride, performing ball-milling, drying, and sintering so as to obtain the ternary composite cathode material LiNi1-x-yAlxCoyO2-zFz; (3) obtaining germanium oxide coated LiNi1-x-yAlxCoyO2-zFz through the adoption of germanium sol coating. According to the preparation method for the cathode material, a wet method is adopted to prepare the ternary material precursor so as to obtain higher energy density and material activity; a solid phase sintering method is adopted to dope F in the material to further improve the stability of the material, and finally the germanium coating is adopted to improve the overall performance of the material.

Description

Technical field [0001] The invention relates to a preparation method of a germanium-coated lithium ion battery ternary composite cathode material. Background technique [0002] Lithium-ion battery is a new type of power supply, which has been widely used in portable electronic equipment, power devices, aerospace, space technology and other fields due to its advantages of high voltage, high capacity, long cycle life, good safety performance, and environmental protection. Lithium batteries are mainly composed of positive electrode materials, negative electrode materials, separators and electrolytes. [0003] There are three main types of cathode materials for lithium batteries commonly used in the market: Lithium Cobalt Oxide (LiCoO 2 ), lithium manganate (LiMn 2 o 4 ) and lithium iron phosphate (LiFePO 4 ). Lithium cobalt oxide (LiCoO 2 ) has a layered crystal structure, the storage capacity is about 140mAh / g, and the cycle performance is relatively superior. However, d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/525H01M4/485
CPCY02E60/122H01M4/485H01M4/525H01M4/62Y02E60/10
Inventor 钱和革
Owner 山东毅聪新能源有限公司
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