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Method for preparing nickel-manganese-based cobalt-covering lithium ion anode material

A cathode material, a technology of cobalt-lithium-coated base, which is applied in the field of preparation of lithium ion batteries

Active Publication Date: 2009-03-04
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] So far, using this method to prepare coated LiNi 0.5-x co 2x mn 0.5-x o 2 (0.03

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add the prepared 100L 0.5mol / L cobalt sulfate solution into a 200L reaction kettle, and slowly add 15L 5mol / L ammonia water using a peristaltic pump under strong stirring conditions to adjust the pH to about 8. After adding the ammonia water, Stir for half an hour to form a uniform cobalt-ammonia complex solution, slowly add the weighed Ni 0.5 mn 0.5 (OH) 2 The matrix is ​​41.78kg. After the addition, stir for one hour. After fully soaking, add 5mol / L sodium hydroxide solution at a constant speed with a constant flow pump until the end point pH is 11. Continue to stir and age for 12 hours, and control the reaction temperature to 40 °C, after separation and washing, dry in a constant temperature drying oven at 80 °C for 24 hours, the cobalt-coated Ni 0.5 mn 0.5 (OH) 2 Precursor. According to Li / (Ni+Mn+Co)=1.05:1, carry out lithium coordination and sinter at 850°C for 12 hours to obtain coated LiNi 0.45 co 0.1 mn 0.45 o 2 Cathode material.

Embodiment 2

[0022] Add the prepared 100L1mol / L cobalt chloride solution into a 200L reaction kettle, and slowly add 15L5mol / L ammonia water using a peristaltic pump under strong stirring conditions to adjust the pH to about 8. After adding the ammonia water, stir Half an hour to form a uniform cobalt-ammonia complex solution, slowly add the weighed Ni 0.5 mn 0.5 (OH) 2 The matrix is ​​41.78kg. After the addition, stir for one hour. After fully soaking, add 5mol / L sodium hydroxide solution at a constant speed with a constant flow pump until the end point pH is 11. Continue to stir and age for 12 hours, and control the reaction temperature to 40 °C, after separation and washing, dry in a constant temperature drying oven at 80 °C for 24 hours, the cobalt-coated Ni 0.5 mn 0.5 (OH) 2 Precursor. According to Li / (Ni+Mn+Co)=1.05:1, carry out lithium coordination and sinter at 850°C for 12 hours to obtain coated LiNi 0.4 co 0.2 mn 0.4 o 2 Cathode material.

Embodiment 3

[0024] Add the prepared 100L 1.5mol / L cobalt chloride solution into a 200L reaction kettle, and slowly add 20L 5mol / L ammonium chloride using a peristaltic pump under the condition of strong stirring, adjust the pH to about 8, and finish adding After ammonia water, stir for half an hour to form a uniform cobalt-ammonia complex solution, and slowly add the weighed Ni 0.5 mn 0.5 (OH) 2 The matrix is ​​41.78kg. After the addition, stir for one hour. After fully soaking, add 5mol / L sodium hydroxide solution at a constant speed with a constant flow pump until the end point pH is 11. Continue to stir and age for 12 hours, and control the reaction temperature to 40 °C, after separation and washing, dry in a constant temperature drying oven at 80 °C for 24 hours, the cobalt-coated Ni 0.5 mn 0.5 (OH) 2 Precursor. According to Li / (Ni+Mn+Co)=1.05:1, carry out lithium coordination and sinter at 850°C for 12 hours to obtain coated LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Cathode material.

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Abstract

The invention relates to a preparation method of the anode material of a nickel-manganese-based cobalt-coated lithium ion battery, which is the preparation method of the anode material LiNi<0.5-x>Co<2x>Mn<0.5-x>O2(x is more than 0.03 and less than or equal to 0.4) of a nickel-manganese-based lithium ion battery with the structure of Alpha-NaFeO2; a cocrystallization method is used for preparing an Ni0.5Mn0.5(OH)2 precursor, then a mode of gradient coating is adopted to carry out the processing of cobalt coating to the precursor so as to obtain a y(Ni0.5Mn0.5(OH)2) question mark (1-y)(Co(OH)2) precursor (y is equal to or more than 0.2 and equal to or less than 0.8); the coated precursor is pre-treated, then is added with lithium and sintered for 8 to 24 hours at the temperature of 750 to 1000 DEG C so as to obtain the nickel-manganese-based lithium ion battery LiNi<0.5-x>Co<2x>Mn<0.5-x>O2. The preparation method has the advantages of high specific volume, stable cycle performance, low cost and convenient operation and is easy for industrial production.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery. Background technique [0002] At the end of the last century, Japan's Sony Corporation successfully developed lithium-ion batteries, which attracted worldwide attention. Due to its high working voltage, small size, no memory effect, long cycle life and other advantages, it has gradually replaced traditional secondary batteries such as lead-acid batteries, nickel-cadmium batteries, and nickel-metal hydride batteries. Among them, the research of cathode materials is a very important link in the research and development of lithium-ion batteries. At present, the main cathode materials used are LiCoO 2 , LiNiO 2 、LiNi 1-x CoO 2 , LiMnO 2 and LiMn 2 o 4 . Commercial lithium-ion battery cathode materials include LiCoO 2 、LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 、LiNi 0.4 co 0.2 mn 0.4 o 2 、LiNi 0.8 co 0.2 o 2 , LiMn 2 o 4 . LiCoO 2 The cycle performance is excellent, the synthe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/122H01M4/525H01M10/0525H01M4/505Y02E60/10
Inventor 陈明峰何金华周汉章
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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