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A kind of preparation method of lithium cobalt oxide cathode material

A cathode material, lithium cobalt oxide technology, used in chemical instruments and methods, battery electrodes, cobalt compounds, etc., can solve the problems of difficult commercial production, strong oxidizability and high valence state of the coating technology, and improve the cycle. Performance and safety performance, improved compaction density, uniform distribution effect

Active Publication Date: 2016-11-16
XTC NEW ENERGY MATERIALS(XIAMEN) LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this series of methods is to realize the filling of small particles in the gaps of large particles through the method of acquired incorporation, the filling effect is limited, and it is difficult to obtain the best filling effect.
[0005] Regarding the improvement of the working voltage of lithium cobalt oxide products, there are two main problems to be solved: 1. When the charging cut-off voltage is higher than 4.3V, since the amount of Li desorption is higher than 50%, the structure of lithium cobalt oxide material is very unstable under this condition , it is easy to collapse, so it is first necessary to solve the problem of the stability of the structure of the lithium cobalt oxide material under high voltage; , the battery electrolyte is easy to react with the material, which eventually leads to the failure of the material
The performance of the positive electrode material modified by these oxide coatings has been improved, but there are some problems in the above solutions, such as the coating needs to go through a wet process to complicate the production process, or the coating technology is difficult to achieve commercial production

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  • A kind of preparation method of lithium cobalt oxide cathode material
  • A kind of preparation method of lithium cobalt oxide cathode material
  • A kind of preparation method of lithium cobalt oxide cathode material

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Embodiment 1

[0026] Dissolve CoCl2 in deionized water to make a salt solution with a Co concentration of 1.2mol / L, and prepare a NH4HCO3 solution with a concentration of 2mol / L. Add the two solutions into the reaction kettle slowly and dropwise, control the reaction temperature to 50°C, the stirring speed to 600r / min, and control the pH value in the early stage of the reaction to 7.5. The slurry overflows continuously during the precipitation process, and all the slurry returns to the reaction after suction filtration. The kettle continues to react, and the reaction time is about 15 days. The reaction product was washed and dried to obtain a spherical shape, D50: 15 μm, 0.45≤consistency≤0.55, and the particle size distribution diagram showed an obvious bimodal distribution of the cobalt carbonate precursor. The precursor was calcined at 700°C for 6 hours to obtain the raw material of tricobalt tetroxide.

[0027] According to Li / Co=1.03 (molar ratio), Mg addition amount is 2000ppm, weigh ...

Embodiment 2

[0035] CoCl 2 Dissolve in deionized water to make a salt solution with a Co concentration of 1.2mol / L, and configure a NH solution with a concentration of 2mol / L 4 HCO 3 solution. Add the two solutions into the reaction kettle slowly and dropwise, control the reaction temperature to 50°C, the stirring speed to 600r / min, and control the pH value in the early stage of the reaction to 7.5. The slurry overflows continuously during the precipitation process, and all the slurry returns to the reaction after suction filtration. The kettle continued to react, and the reaction time was about 18 days. The reaction product was washed and dried to obtain a spherical shape, D50: 18 μm, 0.45≤consistency≤0.55, and the particle size distribution diagram showed an obvious bimodal distribution of the cobalt carbonate precursor. The precursor was calcined at 700°C for 6 hours to obtain the raw material of tricobalt tetroxide.

[0036] According to Li / Co=1.03 (molar ratio), the addition of Zr...

Embodiment 3

[0041] CoCl 2 Dissolve in deionized water to make a salt solution with a Co concentration of 1.2mol / L, and configure a NH solution with a concentration of 2mol / L 4 HCO 3 solution. Add the two solutions into the reaction kettle slowly and dropwise, control the reaction temperature to 50°C, the stirring speed to 600r / min, and control the pH value in the early stage of the reaction to 7.5. The slurry overflows continuously during the precipitation process, and all the slurry returns to the reaction after suction filtration. The kettle continues to react, and the reaction time is about 15 days. The reaction product was washed and dried to obtain a spherical shape, D50: 15 μm, 0.45≦consistency≦0.55, and a cobalt carbonate precursor with obvious bimodal distribution characteristics can be seen from the particle size distribution diagram. The precursor was calcined at 700°C for 6 hours to obtain the raw material of tricobalt tetroxide.

[0042] According to Li / Co=1.03 (molar rati...

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Abstract

A preparation method for a lithium cobalt oxide anode material relates to ananode material for lithium ion secondary batteries. The method comprises thefollowing steps: preparing a cobalt salt solution and a precipitator solution, precipitating a cobalt carbonate precursor by adopting a controlled crystallization process, and sintering cobalt carbonate to obtain cobaltosic oxide, wherein the cobalt carbonate precursor requires that the median diameter D50 ranges from 13-20 mum and the consistency is greater than or equal to 0.40 and smaller than or equal 0.50; mixing and then sintering the cobaltosic oxide, an additive and a lithium compound, milling and screening the product of sintering to obtain a lithium cobalt oxide semi-finished product; mixing thelithium compound and a coating element M, adding the mixture of the lithium compound and the coating element M and the lithium cobalt oxide semi-finished product into a ball mill for mixing, sintering the mixed materials, and milling and screening the product of sintering to obtain the lithium cobalt oxide anode material. The prepared lithium cobalt oxide product has the advantages that the size distribution of particles is uniform, and the product compaction densitycan be remarkably improved.

Description

technical field [0001] The invention relates to a positive electrode material of a lithium ion secondary battery, in particular to a preparation method of a lithium cobalt oxide positive electrode material. Background technique [0002] At present, with the rapid development of portable electronic devices such as mobile phones, notebook computers, and digital cameras, the demand for renewable, high-energy, and long-life batteries in the energy market is increasing. Lithium-ion battery is the battery with the highest voltage and the largest energy density among the batteries that have been practical so far, and has a good development prospect. [0003] Among the currently industrialized lithium-ion battery cathode materials, the production of lithium cobalt oxide has the advantages of simple production process, high capacity density, and good cycle performance, and has firmly occupied most of the lithium-ion secondary battery market. However, with the rapid development of sm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525C01G51/00
CPCC01G51/00H01M4/525Y02E60/10
Inventor 曾雷英罗小成杨盛广詹威
Owner XTC NEW ENERGY MATERIALS(XIAMEN) LTD
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