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Method for repairing ternary positive electrode material with deteriorated performance and acquired ternary positive electrode material

A technology of positive electrode material and repair method, applied in the direction of positive electrode, active material electrode, electrical components, etc., can solve problems such as electrochemical performance degradation, and achieve the effects of low price, simple process, great application value and social significance

Active Publication Date: 2019-12-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows us to create better quality replacement parts called new type ones without damaging their properties over time due to factors like environmental impacts such as exposure to moist air or water vapor from outside sources. By doing this we aim to improve the durability and lifespan of these part components while reducing costs associated therewith.

Problems solved by technology

Layered transition metal dichalides containing alkali metals like sodium and potassium are important components used in secondary cells because these elements enhance their properties while reducing manufacturing complexity compared to pure ones. However, current methods require strict control over moisture levels and atmospheric conditions when utilizing them, leading to higher production costs associated with the replacement process.

Method used

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  • Method for repairing ternary positive electrode material with deteriorated performance and acquired ternary positive electrode material
  • Method for repairing ternary positive electrode material with deteriorated performance and acquired ternary positive electrode material
  • Method for repairing ternary positive electrode material with deteriorated performance and acquired ternary positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) Using petroleum ether as a solvent, the high-nickel cathode material precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 Perform mechanical ball milling with LiOH at a molar ratio of 1:1.05 for 6 h, then evaporate petroleum ether to dryness, place the mixed material in a tube furnace, and sinter at 650 °C for 3 h in an oxygen atmosphere, and then sinter at 800 °C for 10 h. Cool to room temperature, grind and sieve for later use, number NCM811-1.

[0056] (2) Put the nickel-rich ternary material NCM811-1 in an environment with a temperature of about 30°C and an air humidity of about 80% and leave it open for 60 days to obtain NCM811-2, a ternary cathode material with degraded or deteriorated performance. The electrochemical performance before and after is shown in Table 1.

[0057] (3) Add 0.04g of restoration agent aluminum metaphosphate to a solvent containing 20g of absolute ethanol, stir at 400r / min for 10min, add 2g of NCM811-2 material and continue stirring at the same s...

Embodiment 2

[0064] (1) Add 0.04g of repairing agent yttrium metaphosphate to a solvent containing 20g of absolute ethanol, stir at 400r / min for 10min, add 2g of the NCM811-2 material obtained in Example 1 and continue stirring at the same speed for 30min, then, Heat the temperature to 95°C and continue stirring until the ethanol is completely evaporated to obtain product B.

[0065] (2) Place product B in a tube furnace at 2°C min -1 The heating rate was increased to 600 ° C, sintered in an oxygen atmosphere for 6 h, and cooled to room temperature to obtain the positive electrode material NCM811-2@LYPO repaired by yttrium metaphosphate.

[0066] (3) Test and analyze the NCM811-1, NCM811-2 obtained in Example 1 and NCM811-2@LYPO in Example 2 using a scanning electron microscope (SEM) to obtain its SEM image, as image 3 shown.

[0067] (4) The NCM811-2@LYPO obtained in Example 2 was assembled into a 2016-type button battery and charged and discharged within the voltage range of 3.0-4.3V....

Embodiment 3

[0070] (1) Using petroleum ether as a solvent, the high-nickel cathode material precursor Ni 0.9 co 0.05 mn 0.05 (OH) 2 Perform mechanical ball milling with LiOH at a molar ratio of 1:1.05 for 6 h, then evaporate petroleum ether to dryness, place the mixed material in a tube furnace, and sinter at 650 °C for 3 h in an oxygen atmosphere, and then sinter at 720 °C for 10 h. Cool to room temperature, grind and sieve for later use, code NCM90.

[0071] (2) Put the nickel-rich ternary material NCM90 in an environment with a temperature of about 30°C and an air humidity of about 80% and leave it open for 60 days to obtain NCM90-1, a ternary cathode material with declining or deteriorated performance. The electrochemical properties of the materials are listed in Table 1.

[0072] (3) Add 0.04g of restoration agent aluminum metaphosphate to a solvent containing 20g of absolute ethanol, stir at 400r / min for 10min, add 2g of NCM90-1 material and continue stirring at the same speed f...

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Abstract

The invention discloses a method for repairing a ternary positive electrode material with deteriorated performance and the acquired ternary positive electrode material. The material repairing method comprises the steps that a repairing agent is dispersed in an organic solvent; after ultrasonic dispersion, the ternary positive electrode material with deteriorated performance under a state of continuous stirring is added; and the repaired ternary positive electrode material is acquired after filtering and high temperature sintering. The interface of the ternary material can be adjusted by adjusting the amount of the repairing agent and other parameters. At the same time, the repairing agent can react with residual lithium on the surface of the material to form a stable compound, which is beneficial to reducing the residual lithium on the surface of the material and can significantly restore the material performance. According to the invention, the previous technical ideas of preventing performance degradation or deterioration of the ternary positive electrode material of a lithium battery is broken; the material which is degraded and deteriorated is remedially treated; and the problems which are not effectively solved during the preparation, transportation and storage of the ternary positive electrode material are solved.

Description

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Claims

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Application Information

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Owner CENT SOUTH UNIV
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