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Method for cladding LiNi0.133Co0.133Mn0.544O2 material

A technology of coating and lithium salt, which is applied in the field of high specific energy lithium-rich cathode materials for lithium-ion batteries, to achieve the effect of improving coating effect, improving electrochemical performance and preventing contact

Active Publication Date: 2012-03-28
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nowadays, there are higher and higher requirements for the specific capacity of batteries, and it is inevitable to develop some new high specific energy materials. Through research, it is found that LiNi 0.133 co 0.133 mn 0.544 o 2 It is a very good high specific energy lithium-rich cathode material, and its specific capacity can reach more than 250mAh / g, but its stability and cycle performance need to be further improved

Method used

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  • Method for cladding LiNi0.133Co0.133Mn0.544O2 material
  • Method for cladding LiNi0.133Co0.133Mn0.544O2 material
  • Method for cladding LiNi0.133Co0.133Mn0.544O2 material

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Experimental program
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Effect test

Embodiment 1

[0028] Add 0.4224g of lithium acetate to 200ml of ethanol, then add 10g of citric acid, stir to dissolve, then add 1.3176g of pentaethoxyniobium to the solution, stir and mix well, then add 30g of LiNi 0.133 co 0.133 mn 0.544 o 2 Stir for 12 hours to make them fully mix to form a sol; then heat and stir at 80°C to slowly volatilize the ethanol solution to form a dry gel precursor; grind the precursor evenly and put it in a muffle furnace to The temperature was raised to 800°C at a rate of 5°C / min, and the constant temperature was calcined for 5 hours in an air atmosphere; during this high-temperature calcination process, LiNi 0.133 co0.133 mn 0.544 o 2 LiNiO formed on the surface of the material 3 crystals, obtained after natural cooling coated with LiNiO 3 LiNi 0.133 co 0.133 mn 0.544 o 2 Cathode material.

Embodiment 2

[0030] Add 0.1530g of lithium carbonate to 200ml of ethanol, then add 10g of citric acid, stir to dissolve, then add 1.3176g of pentaethoxyniobium into the solution, stir and mix well, then add 30g of LiNi 0.133 co 0.133 mn 0.544 o 2 Stir for 12 hours to make them fully mix to form a sol; then heat and stir at 80°C to slowly volatilize the ethanol solution to form a dry gel precursor; grind the precursor evenly and put it in a muffle furnace to The temperature was raised to 600°C at a rate of 5°C / min, and the constant temperature was calcined for 4 hours in an air atmosphere; during this high-temperature calcination process, LiNi 0.133 co 0.133 mn 0.544 o 2 LiNiO formed on the surface of the material 3 crystals, obtained after natural cooling coated with LiNiO 3 LiNi 0.133 co 0.133 mn 0.544 o 2 Cathode material.

[0031] according to figure 1 The test results show that the coated LiNiO 3 LiNi before and after 0.133 co 0.133 mn 0.544 o 2 material, its XRD patt...

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Abstract

The invention relates to a method for cladding a LiNi0.133Co0.133Mn0.544O2 material, which comprises the following steps: 1) weighing Li source, Nb source, organic acid, LiNi0.133Co0.133Mn0.544O2 and an organic solvent according to proportion; 2) dissolving the weighted lithium salt in the organic solvent, adding organic acid, Nb source and LiNi0.133Co0.133Mn0.544O2 and then stirring to obtain sol; volatilizing the solution to form a gel precursor; 3) grinding the precursor and calcining, cooling to obtain the LiNbO3-cladded LiNi0.133Co0.133Mn0.544O2 positive material. According to the invention, niobium source and lithium-rich LiNi0.133Co0.133Mn0.544O2 positive material are added in the organic solution containing lithium source and organic acid, LiNiO3 is cladded on the surface of the positive material, under the premise that the high-quality performance of the LiNi0.133Co0.133Mn0.544O2 material is not changed, the stability and circularity during the charge and discharge process can be enhanced and the electrochemical performance of the material can be increased.

Description

technical field [0001] The invention belongs to the technical field of high specific energy lithium-rich cathode materials for lithium ion batteries, and in particular relates to a LiNi 0.133 co 0.133 mn 0.544 o 2 Material wrapping method. Background technique [0002] With the development of social informatization and the increasing popularity of portable electronic products such as notebook computers and mobile communication tools, researchers are urgently required to develop high-performance chemical power supplies that are small in size, light in weight, high in energy density, long in cycle life, and safe in performance. High and pollution-free new green power supply. However, some traditional chemical power sources, such as lead-acid batteries, zinc-manganese batteries, nickel-cadmium batteries, etc., cannot meet the needs of these developments. Lithium-ion battery is a new type of high-energy battery developed under this situation, and has become a research hotsp...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/505
CPCY02E60/122Y02E60/10
Inventor 孙文彬彭庆文卢志威刘兴江
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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