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Coating method for core-shell novel positive electrode material for lithium ion battery

A technology of lithium ion battery and positive electrode material, which is applied in the field of new lithium ion battery positive electrode material, can solve the problems of inability to form a coating layer, increase the internal resistance of the battery, and cannot perform performance, and achieves inhibition of side reactions, inhibition of dissolution, and slow oxidation. effect of speed

Active Publication Date: 2013-12-25
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, their cladding materials cannot perform better at higher magnifications.
[0005] The above traditional coating methods will increase the internal resistance of the battery, and cannot completely uniformly form a coating layer on the surface of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 0.1mol LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 material, which was dispersed in 30 ml of deionized water and assisted by ultrasonic dispersion to obtain a slurry. Weigh 0.005 mol of ferric nitrate, 0.005 mol of lithium nitrate, 0.005 mol of ammonium dihydrogen phosphate and 0.02 mol of citric acid, dissolve them in 200 ml of water, and stir at room temperature for one hour to obtain a sol. Add the previously obtained slurry into the sol at a constant speed, then raise the temperature to 80°C and keep this temperature for 10 hours to form a gel, and then dry the gel at 100°C; dry the obtained dry gel under nitrogen Calcined at 650°C for 8 hours under the protection of the atmosphere, and cooled naturally to room temperature to obtain the core-shell structure LiFePO 4 LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Materials: EC:EMC:DMC (1:1:1, V / V / V) is used as the electrolyte, and lithium metal is used as the negative electrode to assemble a 2016 button battery. The 1C cycle of 200 is ...

Embodiment 2

[0028] Take 0.1mol LiMn 2 o 4 material, which was dispersed in 30 ml of deionized water and assisted by ultrasonic dispersion to obtain a slurry. Weigh 0.01 mol of ferric nitrate, 0.01 mol of lithium nitrate, 0.01 mol of ammonium dihydrogen phosphate and 0.02 mol of tartaric acid, dissolve them in 200 ml of water, and stir at room temperature for one hour to obtain a sol. Add the previously obtained slurry into the sol at a constant speed, then raise the temperature to 80°C and keep this temperature for 10 hours to form a gel, and then dry the gel at 100°C; dry the obtained dry gel under nitrogen Calcined at 600°C for 8 hours under the protection of the atmosphere, and cooled naturally to room temperature to obtain the core-shell structure LiFePO 4 LiMn 2 o 4 Materials; EC:EMC:DMC (1:1:1, V / V / V) was used as the electrolyte, and metal lithium was used as the negative electrode to assemble a 2016 button battery. It was tested on the Land charge and discharge tester to ob...

Embodiment 3

[0030] Take 0.1mol LiNi 0.5 mn 1.5 o 4 material, which was dispersed in 30 ml of deionized water and assisted by ultrasonic dispersion to obtain a slurry. Weigh 0.005mol iron phosphate, 0.005mol lithium nitrate and 0.02mol citric acid and dissolve them in 200ml water, stir at room temperature for one hour to obtain a sol. Add the previously obtained slurry into the sol at a constant speed, then raise the temperature to 80°C and keep this temperature for 10 hours to form a gel, and then dry the gel at 100°C; dry the obtained dry gel under nitrogen Calcined at 650°C for 8 hours under the protection of the atmosphere, and cooled naturally to room temperature to obtain the core-shell structure LiFePO 4 LiNi 0.5 mn 1.5 o 4Materials; EC:EMC:DMC (1:1:1, V / V / V) was used as the electrolyte, and metal lithium was used as the negative electrode to assemble a 2016 button battery. It was tested on the Land charge and discharge tester to obtain its 0.2C for the first time. The d...

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Abstract

The invention discloses a coating method for a core-shell novel positive electrode material for a lithium ion battery. A uniform core-shell structure is formed by effective compounding two materials with electrochemical activity; and an effect for enhancing electrochemical performance of the materials is achieved by improving interface state of the materials and reducing side reactions. The coating method comprises the following steps of dispersing the positive electrode material for the lithium ion battery in deionized water and auxiliarily dispersing in a certain manner to obtain a slurry; dissolving a lithium source, an iron source, a phosphate radical source and a chelating agent in water; stirring for 1 hour at a room temperature to obtain a sol; adding the slurry obtained in the first step in the sol; adjusting a pH; then heating to a temperature of 80 DEG C; keeping the temperature for 1-12 h to form a gel; then drying the gel at a temperature of 100 DEG C; sintering the dry gel obtained by the former step for 1-10 hours at a temperature of 600-900 DEG C under the protection of nitrogen; and cooling to a room temperature naturally, so that the core-shell novel positive electrode material for the lithium ion battery is obtained.

Description

technical field [0001] The invention relates to a method for modifying the cathode material of a lithium ion battery. Using the concept of a core-shell structure, a sol-gel method is adopted to prepare a novel lithium ion battery cathode material with a core-shell structure. Background technique [0002] The development of new energy materials is now a research field supported by the state. As a new type of green storage battery, lithium-ion batteries are currently mainly used in portable electronic products, and are also widely used as vehicle power supplies to provide power for electric vehicles (EV). Fields such as power storage and grid peak shaving also play an important role. Lithium-ion battery positive electrode materials that are currently studied include layered structure LiCoO2, LiNiO2, spinel LiMn2O4, and olivine structure LiFePO4. At present, the main cathode materials for lithium-ion batteries, such as LiNi1 / 3Co1 / 3Mn1 / 3O2, LiMn2O4 and LiNi0.5Mn1.5O4, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/505H01M4/525H01M4/58
CPCY02E60/10
Inventor 谢玉虎许鹏王强谢佳
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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