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Preparation technology for spherical lithium cobalt oxide doped with Ti, Mg and Al

A spherical lithium cobaltate, preparation technology, applied in the direction of cobalt carbonate, electrical components, battery electrodes, etc., can solve the problems of poor anti-overcharge performance, lower specific capacity, etc., achieve stable performance, low production cost, simple process flow Effect

Inactive Publication Date: 2012-07-18
ANHUI ALAND NEW ENERGY MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Lithium cobalt oxide is the most commonly used material in lithium-ion battery cathode materials. Compared with other cathode materials, it has the advantages of high open circuit voltage, large specific energy and easy synthesis, and can be charged and discharged quickly. The prepared lithium cobalt oxide has disadvantages such as poor anti-overcharge performance and rapid decrease in specific capacity at higher charging voltages.

Method used

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  • Preparation technology for spherical lithium cobalt oxide doped with Ti, Mg and Al
  • Preparation technology for spherical lithium cobalt oxide doped with Ti, Mg and Al
  • Preparation technology for spherical lithium cobalt oxide doped with Ti, Mg and Al

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Use pure water as the bottom liquid, raise the temperature to 40-50°C, start stirring, control the stirring speed at 150r / min, add 25% ammonium bicarbonate, and adjust the alkalinity of the bottom liquid to keep it at 5.

[0031] Preparation of cobalt salt mixed solution: Add magnesium sulfate and aluminum sulfate into the cobalt salt solution with a metal ion concentration of 60g / l, stir to dissolve, mix evenly, and then add nano-sized TiO 2 and lauryl amidopropyl amine oxide, the addition ratio is 0.05% of the cobalt salt solution, stirring to keep TiO 2 suspended state.

[0032] Among them, Co:Ti=120:1, Co:Mg=400:1, Co:Al=250:1.

[0033] The cobalt salt mixed solution and the ammonium bicarbonate solution with a concentration of 25% are continuously pumped into the bottom liquid in parallel, and a precipitation reaction occurs at 40-50°C. The alkalinity of the reaction system is controlled at 10, and the solid content of the slurry is controlled at 260-300g / l.

...

Embodiment 2

[0040] Use pure water as the bottom liquid, raise the temperature to 50-60°C, start stirring, control the stirring speed at 180r / min, add 30% ammonium bicarbonate, and adjust the alkalinity of the bottom liquid to keep it at 15.

[0041] Preparation of cobalt salt mixed solution: Add magnesium chloride and aluminum chloride into the cobalt salt solution with a metal ion concentration of 80g / l, stir to dissolve, mix evenly, and then add nano-sized TiO 2 and coconut acid diethanolamide, the addition ratio is 0.25% of the cobalt salt solution, stirring to keep TiO 2 suspended state.

[0042] Among them, Co:Ti=300:1, Co:Mg=600:1, Co:Al=200:1.

[0043] The cobalt salt mixed solution and the ammonium bicarbonate solution with a concentration of 30% are continuously pumped into the bottom liquid in parallel, and a precipitation reaction occurs at 50-60°C. The alkalinity of the reaction system is controlled at 20, and the solid content of the slurry is controlled at 220-260g / l.

...

Embodiment 3

[0048] Use pure water as the bottom liquid, raise the temperature to 60-70°C, start stirring, control the stirring speed at 120r / min, add 20% ammonium bicarbonate, and adjust the alkalinity of the bottom liquid to keep it at 25.

[0049] Preparation of cobalt salt mixed solution: Add magnesium nitrate and aluminum nitrate to the cobalt salt solution with a metal ion concentration of 100g / l, stir to dissolve, mix evenly, and then add nano-sized TiO 2 and potassium lauryl ether phospholipid, the addition ratio is 0.43% of the cobalt salt solution, stirring to keep TiO 2 suspended state.

[0050] Among them, Co:Ti=600:1, Co:Mg=200:1, Co:Al=120:1.

[0051] The cobalt salt mixed solution and the ammonium bicarbonate solution with a concentration of 20% are continuously pumped into the bottom liquid in parallel, and a precipitation reaction occurs at 60-70°C. The alkalinity of the reaction system is controlled at 30, and the solid content of the slurry is controlled at 180-220g / l...

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Abstract

The invention relates to the field of lithium ion battery materials and particularly relates to a preparation technology for spherical lithium cobalt oxide doped with Ti, Mg and Al. According to the preparation technology, pure water serves as base solution under the conditions that temperature ranges from 40 DEG C to 80 DEG C and a stirring speed is controlled to 60-180 r / min, ammonium bicarbonate is added into the base solution to adjust the alkalinity of the base solution to range from 5 to 30, cobalt-salt mixed solution and ammonium bicarbonate solution are continuously pumped into the base solution in parallel flow and are subjected to sedimentation reaction under the temperature of 40-80 DEG C, the solid content and the alkalinity of slurry in a reaction system are controlled, reaction feed liquid flows out continuously from an overflow gate at the upper part of a reaction kettle to enter into an ageing kettle and then is washed by a washing press and dried by a vacuum drier, spherical cobalt carbonate is subjected to primary calcination to obtain cobaltosic oxide, and the cobaltosic oxide and a lithium source are subjected to secondary calcination to obtain the spherical lithium cobalt oxide doped with Ti, Mg and Al. According to the invention, the process is simple, the reaction is easy to control, the production cost is low, the product application range is wide, and thus, the method is relatively large in production value; and the spherical lithium cobalt oxide is stable in performance and better in overcharging prevention performance.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a preparation process of spherical lithium cobaltate doped with Ti, Mg and Al. Background technique [0002] Lithium cobalt oxide is the most commonly used material in lithium-ion battery cathode materials. Compared with other cathode materials, it has the advantages of high open circuit voltage, large specific energy and easy synthesis, and can be charged and discharged quickly. The prepared lithium cobalt oxide has disadvantages such as poor anti-overcharge performance and rapid decrease in specific capacity at a higher charging voltage. Contents of the invention [0003] In order to solve the technical problems existing in the prior art, the object of the present invention is to provide a preparation process of spherical lithium cobalt oxide doped with Ti, Mg and Al. [0004] The technical scheme that the present invention adopts is as follows: [0005] A prepa...

Claims

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Application Information

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IPC IPC(8): C01G51/06H01M4/525
CPCY02E60/122Y02E60/10
Inventor 孙朝军孙卫华王艳红王锡芬李世辉张转王大伟鲁海春张春亮
Owner ANHUI ALAND NEW ENERGY MATERIALS
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