Carbon-coated lithium-rich positive electrode material as well as preparation method thereof

A technology of lithium-rich cathode material and lithium-rich material, applied in battery electrodes, electrical components, circuits, etc., can solve the problem that transition metals cannot be oxidized, and achieve the effects of low raw material cost, convenient large-scale industrial production, and low production cost

Active Publication Date: 2014-01-29
SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report on the use of carbon coating to improve the rate performance of lithium-rich cathode materials, which may be due to the fact that the addition of carbon in the traditional preparation method will prevent the transition metal from being oxidized to a high valence state.

Method used

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  • Carbon-coated lithium-rich positive electrode material as well as preparation method thereof
  • Carbon-coated lithium-rich positive electrode material as well as preparation method thereof
  • Carbon-coated lithium-rich positive electrode material as well as preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 3.74g Ni(CH 3 COO) 2 4H 2 O and 8.58g Mn(CH 3 COO) 2 4H 2 O was dissolved in 100 mL of ethanol deionized water (the volume ratio of ethanol to deionized water was 3:1), and magnetically stirred at room temperature for 2 h to fully dissolve it. Prepare ammonia water with a concentration of 0.5 mol / L, add the ammonia water dropwise to the metal salt solution, and adjust its pH value to 11. Take 7.02mL of hydrogen peroxide and add it dropwise to the above solution. Weigh 7.50g CH according to the molar ratio of Li:(Ni+Mn) of 1.47:1 3 COOLi·2H 2 O, Lithium acetate is added to the prepared nickel-manganese metal salt solution. Place the above prepared solution in a water bath at 80°C, stir magnetically until all the liquid disappears, put it in a drying oven at 80°C for 20 hours, grind the dried solid into powder, and keep it warm in an air atmosphere at 450°C for 4 hours , to obtain a lithium-rich mesophase.

[0024] Weigh 3 g of the above lithium-rich mater...

Embodiment 2

[0029] Weigh 4.98g Ni(CH 3 COO) 2 4H 2 O and 15.00g Mn(NO 3 ) 2 4H 2 O was dissolved in 80 mL of ethanol deionized water (the volume ratio of ethanol to deionized water was 3:1), and magnetically stirred at room temperature for 2 h to fully dissolve it. Prepare ammonia water with a concentration of 0.8 mol / L, add the ammonia water dropwise to the metal salt solution, and adjust its pH value to 10.5. Take 12.04mL hydrogen peroxide and add dropwise to the above solution. Weigh 12.89g CH according to the molar ratio of Li:(Ni+Mn) of 1.58:1 3 COOLi·2H 2 O, Lithium acetate is added to the prepared nickel-manganese metal salt solution. Place the above prepared solution in a water bath at 80°C, stir magnetically until all the liquid disappears, put it in a drying oven at 80°C for 26 hours, grind the dried solid into powder, and keep it warm in an air atmosphere at 450°C for 5 hours , to obtain a lithium-rich mesophase.

[0030] Weigh 4g of the above lithium-rich material me...

Embodiment 3

[0034] Weigh 6.21g Ni(NO 3 ) 2 ·6H 2 O and 9.64g Mn(NO 3 ) 2 4H 2 O was dissolved in 100 mL of ethanol deionized water (the volume ratio of ethanol to deionized water was 3:1), and magnetically stirred at room temperature for 2 h to fully dissolve it. Prepare ammonia water with a concentration of 0.6 mol / L, add the ammonia water dropwise to the metal salt solution, and adjust its pH value to 10.5. Take 7.73mL hydrogen peroxide and add dropwise to the above solution. Weigh 3.40g LiOH·H at a molar ratio of Li:(Ni+Mn) of 1.35:1 2 O, the LiOH·H 2 O was added to the prepared nickel-manganese metal salt solution. Place the above-mentioned prepared solution in an 80°C water bath, stir magnetically until all the liquid disappears, put it into an 80°C drying oven to dry for 24 hours, grind the dried solid into a powder, and place the powder in 450°C air The atmosphere was kept warm for 6 hours to obtain a lithium-rich mesophase.

[0035] Weigh 3.5g of the above lithium-rich m...

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Abstract

The invention belongs to the technical field of lithium ion battery positive electrode materials and discloses a carbon-coated lithium-rich positive electrode material as well as a preparation method thereof. The surface-coated lithium-rich material comprises a principal phase Li[LiaNi(1/2-3a/2)M(n1/2+a/2)]O2 (a being greater than 0 and less than 1/3) as well as a coated carbon layer. The preparation method of the material comprises the following steps: a step of preparing an intermediate phase of the lithium-rich material, namely Li[LiaNi(1/2-3a/2)M(n1/2+a/2)]O2 (a being greater than 0 and less than 1/3), a step of uniformly mixing the lithium-rich intermediate phase and a carbon source, and a step of quickly and thermally treating at a high speed. The lithium ion battery positive electrode material prepared by the preparation method disclosed by the invention greatly improves charging and discharging performances of the material under high multiplying power and can satisfy high-power development requirements. Moreover, the carbon-coated lithium-rich positive electrode material is low in material cost, simple in process, high in cost performance and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and in particular relates to a carbon-coated lithium-rich lithium-ion battery cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in people's daily life, especially in a large number of portable electronic products such as mobile phone batteries, notebook batteries, and mobile power supplies. At present, countries around the world are also increasing investment in the research of the application of lithium-ion batteries in technical fields such as electric vehicles and aerospace. With the implementation of new energy vehicle policies around the world, the demand for lithium-ion batteries in electric vehicles and grid energy storage may show explosive growth in the future. This puts forward higher requirements for each component that constitutes a lithium-ion battery. Research and development of high-power, high-rat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583
CPCH01M4/505H01M4/525H01M4/62Y02E60/10
Inventor 范丽珍李红萧
Owner SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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