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Lithiation treatment method of diaphragm and diaphragm material treated by using lithiation treatment method

A treatment method and diaphragm technology, applied to electrochemical generators, electrical components, circuits, etc., can solve the problems of low initial charge and discharge efficiency, high porosity, etc.

Active Publication Date: 2021-05-14
天津谦同新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Therefore, based on the problem of low initial charge and discharge efficiency of lithium-ion batteries, a method is provided that uses the characteristics of high specific surface area and high porosity of the separator, and adds a small amount of lithium salt to the separator to provide additional lithium ions for the formation reaction of lithium batteries. The lithiation treatment method of the separator and the processed separator material have important practical significance

Method used

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  • Lithiation treatment method of diaphragm and diaphragm material treated by using lithiation treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]The lithiation treatment method of a diaphragm, steps below:

[0036]The diaphragm was soaked with a dilute hydrochloric acid with a weight percentage of 0.1%, and then cleaned with distilled water to a pH test paper, it was shown to be 6 (measurement standard: 1 part separator was soaked in 9 parts of distilled water for 10 minutes after measurement). After the drying was taken, it was soaked in a lithium sulfate solution having a weight percentage of 0.1%, and heated to a high temperature of 60 ° C, heat insulation 100 h. Take it dry. The weight of the silane coupling agent is sprayed on the diaphragm using the weight percentage of 1% by weight, and the load amount of the silane coupling agent on the membrane is 1 g / m.2. The diaphragm was taken, about 50 ° C, 0.05 MPa vacuum, dry 48 h.

[0037]The diaphragm material treated by this method can greatly increase the first charge and discharge efficiency of the lithium ion battery. For example, 18650 lithium iron phosphate batteries...

Embodiment 2

[0040]The lithiation treatment method of a diaphragm, steps below:

[0041]The diaphragm was soaked with a weight percentage of 20% by weight, and then cleaned with distilled water to a pH test paper, it was shown to be 8 (measurement criteria: 1 part of the diaphragm was soaked for 10 minutes after 9 parts of distilled water). After the drying is taken, the soaking of it is then immersed in a lithium dihydroduct lithium hydrogen phosphate solution in weight, and the seal is warmed to a high temperature of 150 ° C (100 degrees, water will boil, more than 100 degrees of treatment temperature needs to be sealed), heat 1h. Take it dry. The weight of the silane coupling agent is sprayed on the membrane using a weight percentage of 20%, and the load of the silane coupling agent on the membrane is 100 g / m.2. The diaphragm was taken, about 100 ° C, 0.001 MPa vacuum, dry 12h.

[0042]The diaphragm material treated by this method can greatly increase the first charge and discharge efficiency of ...

Embodiment 3

[0044]The lithiation treatment method of a diaphragm, steps below:

[0045]The diaphragm was soaked with a weight percentage of 10% by weight, and then washed with distilled water to the pH test paper to be selected as 7 (measurement criteria: 1 part of the diaphragm was soaked in 9 parts of distilled water for 10 minutes after measurement). After the drying was taken, it was soaked in a lithium nitrate solution having a weight percentage of 5%, and heated to a high temperature of 100 ° C, and held 2 h. Take it dry. The weight of the silane coupling agent was used in weight percentage, and the load capacity of the silane coupling agent on the membrane was 20 g / m.2. The diaphragm was taken, about 80 ° C, 0.01 MPa vacuum, dry 48 h.

[0046]The diaphragm material treated by this method greatly increases the first charge and discharge efficiency of lithium ion batteries. For example, it is made into a 10AH-specific 811 system three-membered aluminum-shell battery, which can increase the fir...

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Abstract

The invention belongs to the technical field of preparation of lithium ion battery diaphragms, and particularly relates to a lithiation treatment method of a diaphragm and a diaphragm material treated by using the lithiation treatment method. The lithiation treatment method of the diaphragm comprises the following steps of: 1, subjecting the diaphragm to appropriate acid treatment, then washing the diaphragm to be neutral with distilled water and drying the diaphragm; 2, soaking the diaphragm treated in the step 1 in a neutral soluble lithium salt solution, and performing high-temperature digestion for a certain time; 3, spraying a curing agent on the diaphragm; and 4, drying the diaphragm. According to the lithiation treatment method for the diaphragm and the diaphragm material treated by using the lithiation treatment method, the characteristics of high specific surface area and high porosity of the diaphragm are utilized, a small amount of lithium salt is added into the diaphragm, and extra lithium ions are provided for formation reaction of a lithium battery.

Description

Technical field[0001]The present invention belongs to the preparation of a lithium ion battery diaphragm, and more particularly to a lithiation treatment method of a diaphragm and a diaphragm material thereof.Background technique[0002]Existing technology and defects:[0003]The main components of the lithium ion battery are: positive, negative electrode, electrolyte and diaphragm. The performance of the diaphragm affects the electrical properties and safety performance of the battery. The main function is to separate the positive and negative electrode, prevent short circuit, and the unique microporous structure can pass the lithium ion, thereby a certain extent affect the electrochemical energy of the battery. There are three commonly seen in the market: three types of polypropylene, single-layer polyethylene, three-layer polypropylene or polyethylene composite diaphragm. These battery diaphragms can be divided into dry, wet, and the largest difference is different from the internal ...

Claims

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Application Information

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IPC IPC(8): H01M50/403H01M10/0525
CPCH01M10/0525Y02E60/10
Inventor 吴如森
Owner 天津谦同新能源科技有限公司
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