Method for reducing pH value of lithium ion electrode material

An electrode material, lithium-ion technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of high-temperature gas production, difficulty in getting coating, and inability to completely solve LTOPH value

Inactive Publication Date: 2014-09-17
镇江智联德科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the carbon coating method has not been very successful, mainly because it is difficult to obtain a very uniform coating along the entire particle surface
Therefore, carbon coating cannot completely solve the problem of high-temperature gas production caused by the high pH value of LTO

Method used

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  • Method for reducing pH value of lithium ion electrode material
  • Method for reducing pH value of lithium ion electrode material
  • Method for reducing pH value of lithium ion electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] a. LiCoO 2 The electrode sample is placed in the reaction chamber of the atomic layer deposition instrument, vacuumed and the temperature of the reaction chamber is heated to 400 Kelvin, so that the electrode sample is kept at the set temperature for 25 minutes, and the air pressure in the reaction chamber is 10 millitorr;

[0036] b. Open the outlet valve, pulse the cleaning gas, and clean for 15 seconds;

[0037] c. Close the outlet valve, pulse gaseous trimethylaluminum for 0.01 seconds, and then keep for a period of 60 seconds;

[0038] d. Then open the gas outlet valve, pulse sweeping gas argon, and sweep for 1 minute; close the gas outlet valve, vacuumize, and remove excess reaction by-products;

[0039] e. Then close the outlet valve, pulse gaseous water for 10 seconds, and then keep it for 5 seconds;

[0040] f. Then open the outlet valve, pulse sweeping gas argon, and sweep for 1 minute; close the outlet valve again, vacuumize, and remove excess reaction by-p...

Embodiment 2

[0044] a. LiNi 0.8 mn 0.1 co 0.1 o 2 The electrode sample is placed in the reaction chamber of the atomic layer deposition instrument, vacuumed and the temperature of the reaction chamber is heated to 450 Kelvin, so that the electrode sample is kept at the set temperature for 5 minutes, and the air pressure in the reaction chamber is 10 millitorr;

[0045] b. Open the outlet valve, pulse sweeping gas nitrogen, and sweep for 3s;

[0046] c. Close the outlet valve, pulse gaseous aluminum trichloride for 10 seconds, and then keep it for 1 second;

[0047] d. Then open the air outlet valve, pulse purge nitrogen, and sweep for 0.1 minutes; close the air outlet valve, vacuumize, and remove excess reaction by-products;

[0048] g. Return to step c and execute step c and the following steps in a loop.

[0049] An electrode with a metal oxide thickness of approximately 2 angstroms was obtained. Such as figure 2 As shown, the electrode material treated by this method, especially...

Embodiment 3

[0051] a. LiNi 0.6 mn 0.2 co 0.2 o 2 The electrode sample is placed in the reaction chamber of the atomic layer deposition instrument, vacuumized and the temperature of the reaction chamber is heated to 500 Kelvin, and the electrode sample is kept at the set temperature for 5 minutes, and the air pressure in the reaction chamber is 10 millitorr;

[0052] b. Open the outlet valve, pulse sweeping gas argon, and sweep for 10s;

[0053] c. Close the outlet valve, pulse gaseous tetraisopropyl titanate for 1 second, and then keep it for 20 seconds;

[0054] d. Then open the gas outlet valve, pulse sweeping gas argon, and sweep for 0.5 minutes; close the gas outlet valve, vacuumize, and remove excess reaction by-products;

[0055] e. Then close the outlet valve, pulse ozone for 1 second, and then keep it for 30s;

[0056] f. Then open the outlet valve, pulse sweeping gas argon, and sweep for 0.1 to 1 minute; close the outlet valve again, vacuumize, and remove excess reaction by-...

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PUM

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Abstract

The invention relates to a method for reducing the pH value of a lithium ion electrode material. The method for reducing the pH value of the lithium ion electrode material comprises the following steps: a. arranging an electrode sample into a reaction cavity of an atom layer deposition instrument, vacuumizing and heating the temperature of a reaction chamber to 300-1000 Kelvin, keeping the electrode sample at the setting temperature for 5-30 minutes, wherein the air pressure in the reaction cavity is lower than 0.01 atmospheric pressure; b. switching on a gas discharge valve, and carrying out pulse sweeping on gas for 3-60 seconds; c. switching off the gas discharge valve, and pulsing a gaseous precursor A or the mixture of the precursor A and the carried gas; d. then switching on the gas discharge valve, and carrying out pulse sweeping gas, switching off the gas discharge valve, vacuumizing, and removing residual reaction byproducts; g. returning to the step c and executing the following steps repeatedly until the required coating thickness being 2-30 angstroms is achieved. According to the method, uniform metal oxide coatings can be formed uniformly on the surface of an electrode, and the pH value of the lithium ion electrode material can be reduced, so that the service life of the lithium battery is prolonged and the safety is improved, and the method for reducing the pH value of the lithium ion electrode material is worthy of being popularized and applied.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium ion batteries, in particular to a method for reducing the pH value of lithium ion electrode materials. Background technique [0002] Lithium-ion batteries are a rapidly growing application. It has important applications in many fields, including hybrid electric vehicles and plug-in electric vehicles. These batteries typically consist of a lithium-containing transition metal oxide or lithium-containing transition metal phosphate positive electrode and a graphite negative electrode. These electrodes usually consist of electrode powders and organic binders. Therefore, the electrode exhibits a porous structure. [0003] At present, these electrodes and electrode materials have very serious performance deficiencies. Improving the ease of handling of lithium-containing cathode materials is a very headache. In general, the pH value of the electrode material affects the surface chemistr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/62
CPCY02E60/122H01M4/1391H01M4/62Y02E60/10
Inventor 解明王韫宇
Owner 镇江智联德科技有限公司
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