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Ceramic diaphragm and preparation method thereof, and lithium ion battery

A lithium-ion battery and ceramic diaphragm technology, applied in the field of lithium-ion batteries, can solve the problems of affecting the life of lithium-ion batteries, the decrease of battery cycle life, and the decrease of battery performance, so as to improve safety performance and cycle performance, light specific gravity, and reduce wear and tear degree of effect

Inactive Publication Date: 2019-11-15
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

LiPF 6 Decomposition of LiPF occurs in the electrolyte 6 =LiF+PF 5 , in the presence of water in the electrolyte, PF 5 Further decomposition of PF will occur 5 +H 2 O=2HF+PF 3 O, HF and Lewis acid (PF) produced by the above reaction 5 、PF 3 O, etc.) can cause side reactions in lithium-ion batteries, leading to battery performance degradation, such as studies have shown in LiFePO 4 Adding 1000ppm of moisture to the graphite battery will lead to a significant decrease in the cycle life of the battery, and the life is less than 50 times. The EIS test shows that adding moisture to the battery will lead to a significant increase in the internal resistance of the battery, which shows that the extra moisture is cause LiPF in the electrolyte 6 Decomposition occurs, and the generated HF and Lewis acid will cause side reactions in the battery, so that the lithium-ion battery will form a high-impedance SEI film, which will affect the life of the lithium-ion battery

Method used

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  • Ceramic diaphragm and preparation method thereof, and lithium ion battery
  • Ceramic diaphragm and preparation method thereof, and lithium ion battery
  • Ceramic diaphragm and preparation method thereof, and lithium ion battery

Examples

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preparation example Construction

[0058] Preparation method of ceramic diaphragm:

[0059] 1) Mixing of powders: ball milling alumina ceramics for 0.5-2 hours to obtain alumina ceramics powders;

[0060] 2) Preparation of glue solution: Add the binder into the organic solvent, stir in a vacuum environment at a temperature of 30-50°C until the binder is completely dissolved, then add polyvinyl-pyridine until it is completely dissolved, get the glue;

[0061] 3) Preparation of slurry: Add the alumina ceramic powder obtained in the above step 1) to the glue solution in step 2) in a vacuum environment at a temperature of 30-50° C. to obtain the slurry, the slurry The fineness is 20μm;

[0062] 4) Coating: coating the slurry obtained in step 3) on the surface of the base film, and drying in a vacuum oven at a temperature of 50° C. to 90° C. to obtain a ceramic diaphragm.

[0063] Examples 1-3 adopt the above-mentioned preparation method in combination with the parameters in Table 1.

[0064] Table 1

[0065] ...

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Abstract

The invention discloses a ceramic diaphragm and a preparation method thereof, and a lithium ion battery. The method comprises steps that (1) ball milling of alumina ceramics is performed to obtain alumina ceramic powder; (2), mixing binder with organic solvent and polytetraethylene-pyridine is performed to obtain glue solution; (3), mixing the said alumina ceramic powder with the glue solution isperformed to obtain slurry; and (4), the slurry is applied to at least a part of a base film, and the ceramic diaphragm is obtained after drying. The method is advantaged in that the method can prepare the ceramic diaphragm with high air permeability and good thermal stability, the ceramic diaphragm can capture Mn2+ ions, the Mn2+ ions are applied to in a lithium ion battery, deposition of dissolved manganese on a negative electrode can be effectively reduced, and thereby safety performance and cycle performance of the lithium ion battery are improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a ceramic diaphragm, a preparation method thereof and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, high specific power, good cycle performance, no memory effect, and no pollution. They have good economic benefits, social benefits, and strategic significance. They have become the most eye-catching green chemical power sources. [0003] In lithium-ion batteries, the separator mainly plays the role of preventing positive and negative electrodes from contacting and allowing ion conduction, and is an important part of the battery. At present, commercial lithium-ion batteries mainly use polyolefin diaphragm materials with microporous structures, such as single-layer or multi-layer films of polyethylene (Polyethylene, PE) and polypropylene (Polypropylene, PP). Due to the characteristics of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M10/653H01M10/654
CPCH01M10/0525H01M2200/00H01M10/653H01M10/654H01M50/403H01M50/446Y02E60/10
Inventor 李子凡李雷李路伟周昊
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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