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Diaphragm of lithium ion battery, and preparation method and application thereof

A technology of lithium-ion batteries and lithium batteries, which is applied to battery components, separators/films/diaphragms/spacers, circuits, etc., to suppress battery deformation, improve the ability to resist external damage, increase the rate and cycle performance effect

Pending Publication Date: 2021-12-21
ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By adopting adhesive polymer coating, the safety performance of the battery can be improved, the deformation of the battery caused by the expansion of the pole piece during the cycle can be suppressed, the ability of the battery to resist damage by external forces can be improved, and the safety performance of the battery can be improved.

Method used

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  • Diaphragm of lithium ion battery, and preparation method and application thereof
  • Diaphragm of lithium ion battery, and preparation method and application thereof
  • Diaphragm of lithium ion battery, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] This embodiment provides a separator for a lithium-ion battery. The separator substrate 1 has a thickness of 9 μm and a tortuosity of 20%; the thickness of the wetting layer 2 is 3 μm, and the diffusion rate of the soluble salt in the wetting layer 2 is 55 mm / min; Layer 3 coverage was 65%.

[0050] figure 1 It is a cross-sectional SEM test diagram of the separator of the lithium-ion battery provided in Example 1.

[0051] figure 2 It is a plane SEM test picture of the separator of the lithium-ion battery provided in Example 1.

Embodiment 2

[0053] This embodiment provides a separator for a lithium-ion battery. The separator substrate 1 has a thickness of 5 μm and a tortuosity of 18%; the thickness of the wetting layer 2 is 3.5 μm, and the diffusion rate of the soluble salt in the wetting layer 2 is 30 mm / min; The coverage of junction layer 3 is 50%.

Embodiment 3

[0055] This embodiment provides a diaphragm for a lithium-ion battery. The diaphragm substrate 1 has a thickness of 15 μm and a tortuosity of 16%; the thickness of the wetting layer 2 is 5 μm, and the diffusion rate of the soluble salt in the wetting layer 2 is 45 mm / min; Layer 3 coverage was 70%.

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Abstract

The invention provides a diaphragm of a lithium ion battery, and a preparation method and application thereof. The diaphragm comprises a diaphragm base material, and an infiltration layer and a bonding layer are sequentially arranged on the surface of the diaphragm base material in a stacked mode. According to the invention, through the unique structural design of the base material and the coating, the battery safety, the battery performance and the manufacturing efficiency are considered at the same time. By adopting the low-tortuosity porous base material, the internal resistance of the battery can be reduced, and the multiplying power and the cycle performance can be improved. By adopting the high-wettability coating, the wettability time after liquid injection can be shortened, the production efficiency is improved, the dynamic performance of the battery is improved, and the cycle performance of the battery can be ensured to be improved. By adopting the adhesive polymer coating, the safety performance of the battery can be improved, the problem of battery deformation caused by pole piece expansion in the circulating process is inhibited, the external force damage resistance of the battery is improved, and the safety performance of the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of battery design, and relates to the design of a diaphragm, in particular to a diaphragm of a lithium ion battery and a preparation method and use thereof. Background technique [0002] As an important part of lithium-ion batteries, the lithium battery separator affects the manufacturing efficiency of the battery cell, the electrochemical performance of the battery cell and the safety performance of the battery. However, the factors affecting the three factors mentioned above are different, and often even contradictory. At present, the commonly used lithium battery separators are mainly polyethylene separators and polypropylene separators. The melting point of polyethylene separators is about 130°C, and the melting point of polypropylene separators is about 160°C. When the battery working environment temperature is high or the discharge current is too large , due to the thermal inertia of the electrolyte, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/40H01M50/403H01M50/449
CPCH01M50/403H01M50/40H01M50/449Y02E60/10
Inventor 张馨月孙化雨梁昌盛其他发明人请求不公开姓名
Owner ENVISION DYNAMICS TECH (JIANGSU) CO LTD
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