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A kind of laminated composite lithium battery diaphragm

A technology for battery separators and lithium composites, which is applied to battery components, circuits, electrical components, etc., can solve the problems of poor temperature resistance, low lithium ion conductivity, and low wettability, and achieves simple and easy-to-operate preparation methods, The effect of high electrolyte permeability and high puncture strength

Active Publication Date: 2015-12-09
SINOMA LITHIUM BATTERY SEPARATOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the urgent demand for high-power, high-speed charging and discharging lithium-ion batteries in all walks of life, people have gradually realized that the separator has the following defects during use: promoting the precipitation of dendrites can easily puncture the separator and cause a short circuit; the wettability of the electrolyte is low As a result, the conductivity of lithium ions is low; the temperature resistance is poor, and the high temperature often generated during excessive charging and discharging causes the diaphragm to shrink or even melt, causing the electrodes to directly contact short circuit, causing fire or even explosion and causing personal injury
Especially for power lithium-ion batteries, higher requirements are placed on the porosity, electrolyte wettability, temperature resistance, and mechanical properties of the separator. Pure polyolefin separators can no longer meet the needs of lithium battery use and safety.
It restricts the development of lithium-ion batteries and related industries

Method used

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  • A kind of laminated composite lithium battery diaphragm
  • A kind of laminated composite lithium battery diaphragm
  • A kind of laminated composite lithium battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Such as figure 2 As shown, in the overcoating composite lithium battery diaphragm, the grafted PTFE microporous membrane layer and the ceramic coating are sequentially compounded on the upper and lower surfaces of the grafted PE microporous membrane layer.

[0040] Preparation method: as figure 1 As shown, the grafted PE and grafted PTFE films are stacked in the order of grafted PTFE / grafted PE / grafted PTFE, actively unrolled, and flattened. The plane tension of the laminated film is 0.85kg, and the temperature of the hot roller is 320°C , PTFE film wrapping angle 180° on the hot roll, hot roll pressure 2kg, line speed 5 m / min, graft PTFE / graft PE / graft PTFE are laminated together by hot pressing; dipping technology is used for double-sided coating For ceramic solution, scrape off excess solution on both sides, dry with hot air at 120°C, speed 5 m / min; cure with hot air at 260°C, irradiate with ultraviolet rays, speed 5 m / min, wind up into film, cut to be tested.

[...

Embodiment 2

[0044] Laminated composite lithium battery diaphragm, the grafted PTFE microporous membrane layer and ceramic coating are sequentially compounded on the upper and lower surfaces of the grafted PE microporous membrane layer.

[0045] Preparation method: stack the grafted PE and grafted PTFE films in the order of grafted PTFE / grafted PE / grafted PTFE, unwind and flatten the film automatically, the plane tension of the laminated film is 0.5kg, and the temperature of the hot roller is 310°C , PTFE film wrapping angle 180° on the hot roll, hot roll pressure 2kg, line speed 5 m / min, graft PTFE / graft PE / graft PTFE are laminated together by hot pressing; dipping technology is used for double-sided coating For ceramic solution, scrape off excess solution on both sides, dry with hot air at 120°C, speed 5 m / min; cure with hot air at 280°C, irradiate with ultraviolet rays, speed 5 m / min, roll into film, cut to be tested.

[0046] The preparation of the ceramic solution is: ceramic nanopart...

Embodiment 3

[0049] Laminated composite lithium battery diaphragm, the grafted PTFE microporous membrane layer and ceramic coating are sequentially compounded on the upper and lower surfaces of the grafted PE microporous membrane layer.

[0050] Preparation method: stack the grafted PE and grafted PTFE membranes in the order of grafted PTFE / grafted PE / grafted PTFE, unwind and flatten them automatically, with a tension of 1kg and a hot roller temperature of 300°C. The wrap angle on the roll is 180°, the pressure of the hot roll is 2kg, and the line speed is 5 m / min. The grafted PTFE / grafted PE / grafted PTFE are hot-pressed and stacked together; the ceramic solution is coated on both sides by dipping technology, and the scraping is smoothed The excess solution on both sides is dried with hot air at a temperature of 120°C and a speed of 5 m / min; cured with hot air at 300°C, irradiated with ultraviolet light at a speed of 5 m / min, rolled into a film, and cut to be tested.

[0051] The preparati...

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Abstract

The invention discloses a laminated composite lithium battery diaphragm and a preparation method thereof. The laminated composite lithium battery diaphragm is sequentially compounded with a grafted PTFE microporous film layer and a ceramic coating on the upper and lower surfaces of the grafted PE microporous film layer. , the thickness of the ceramic coating is 0.001-7 μm; the thickness of the grafted PTFE microporous membrane layer is 1-10 μm; the thickness of the grafted PE microporous membrane layer is 5-25 μm. Diaphragm preparation, including the following steps in sequence: stack the grafted PTFE microporous membrane on the upper and lower surfaces of the grafted PE microporous membrane, and hot press to make them composite into one, to obtain the initial diaphragm, and the hot pressing temperature is 100~ 350°C, pressure 0.3-6kg, line speed 0.5-50 m / min; impregnate the initial diaphragm in the ceramic suspension, dry and solidify; the resulting diaphragm has high puncture resistance, high porosity, and high temperature Good shut-off performance.

Description

technical field [0001] The invention relates to a laminated composite lithium battery diaphragm and a preparation method thereof. Background technique [0002] Lithium batteries have the advantages of high specific energy, small size, light weight, less self-discharge, long cycle life, and no pollution. They have been used more and more widely. The market extends to mobile phones, laptop computers, digital cameras, power tools, Electric bicycles, electric motorcycles, electric vehicles, energy storage, aerospace, military vehicles, ships, weapons and many other fields are an important part of the new energy industry. [0003] Lithium-ion batteries are composed of positive and negative electrode materials, electrolyte, separator and battery case. As the "third pole" of the battery, the separator is one of the key inner components in a lithium-ion battery. After the separator absorbs the electrolyte, it can isolate the positive and negative electrodes to prevent short circui...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M2/18H01M50/403H01M50/434H01M50/457H01M50/491
CPCY02E60/10
Inventor 赵东波黄箭玲范凌云费传军董浩宇周群郭晓蓓吴涛朱平黎鹏杨振东宋尚军白耀宗
Owner SINOMA LITHIUM BATTERY SEPARATOR CO LTD
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