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High-nickel ternary positive electrode material washing method

A positive electrode material, high-nickel technology, applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problem of not being able to fully wash off the residual alkali, achieve the effect of improving safety, reducing alkalinity, and reducing the content of residual alkali

Inactive Publication Date: 2019-03-29
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, simply rinsing with deionized water cannot sufficiently wash away the residual alkali closely attached to the surface of the powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Weigh 25g of NCM622, add 100g of deionized water, stir for 5min, and ultrasonicate for 5min at a frequency of 28khz and a power of 100w;

[0028] 2. Filter and burn back in an oxygen environment at 700°C for 5 hours;

[0029] 3. Take 5g of the dried powder and add 95g of deionized water, stir for 5min and then filter with suction, and measure the content of lithium carbonate and lithium hydroxide in the filtrate.

Embodiment 2

[0031] 1. Weigh 25g of NCM622, add 100g of deionized water, stir for 5min, and ultrasonicate for 2min at a frequency of 28khz and a power of 100w;

[0032] 2. Filter and burn back in an oxygen environment at 700°C for 5 hours;

[0033] 3. Take 5g of the dried powder and add 95g of deionized water, stir for 5min and then filter with suction, and measure the content of lithium carbonate and lithium hydroxide in the filtrate.

Embodiment 3

[0035] 1. Weigh 25g of NCM622, add 100g of deionized water, stir for 5min, and ultrasonicate for 10min at a frequency of 28khz and a power of 100w;

[0036] 2. Filter and burn back in an oxygen environment at 700°C for 5 hours;

[0037] 3. Take 5g of the dried powder and add 95g of deionized water, stir for 5min and then filter with suction, and measure the content of lithium carbonate and lithium hydroxide in the filtrate.

[0038] Please refer to figure 1 , the XRD results of the ternary cathode material before and after ultrasonic washing in Example 1 show that the particle size distribution before and after ultrasonic washing all presents a normal distribution. After the water-washed materials are ultrasonically treated, the particle size distribution curve shifts to the right as a whole and extends to both ends. D10 decreases and D90 increases, indicating that ultrasonic treatment will cause a small amount of fine powder of the material, but the overall particle size di...

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Abstract

The invention provides a high-nickel ternary positive electrode material washing method. The method comprises the steps: weighing a certain amount of a lithium battery positive electrode material (NCM622), adding deionized water at a certain solid-liquid ratio, performing stirring for a time period, then performing the ultrasound treatment for a period of time, and then filtering the obtained solution to perform anti-burning for 5h in an oxygen environment under the temperature of 700 DEG C; adding 100g of deionized water to 5g of the powder obtained after drying, performing filtering after stirring, and finally testing the content of lithium carbonate and lithium hydroxide in the filtrate through a potentiometric titration method. The invention provides the water washing method for treating a high nickel ternary positive electrode material by using ultrasonic waves to reduce the residual alkali content on the surface of the material. The method has the advantages of simple process, convenient operation and high product safety.

Description

Technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a water washing method for high-nickel ternary positive electrode materials. Background technique [0002] The current lithium-ion batteries mainly include lithium manganese oxide batteries, lithium cobalt oxide batteries and ternary batteries, and ternary batteries are quickly favored by the market due to their high energy density, good cycle life, environmental friendliness and low price. And it is used in digital batteries, electric vehicles and other fields, but the problem of gas production in high-nickel ternary lithium batteries is relatively serious, and the safety of batteries has always been a great technical challenge, making it difficult for ternary power batteries to pass acupuncture and overcharge and other test conditions. [0003] Washing the material is a new technology to improve the performance of the high-nickel ternary cathode material....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139
CPCH01M4/139Y02E60/10
Inventor 刘雪东李萌诸士春许晶刘文明
Owner CHANGZHOU UNIV
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