Composite lithium battery membrane and method for making same

A battery diaphragm and lithium composite technology, which is applied in the field of new composite polypropylene lithium battery diaphragm and its preparation, can solve problems such as limited liquid absorption, poor mechanical properties of the diaphragm, and impact on battery cycle performance, so as to achieve good cycle performance and improve Effect of Room Temperature Conductivity

Inactive Publication Date: 2004-11-17
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned separators have certain disadvantages. For example, the polyolefin separator itself has poor wettability to the electrolyte and limited liquid absorption, which affects the cycle performance of the battery; while the separator developed by Bellcore in the United States, when it is extracted with an organic solvent, a Impurities (such as extractants) will be introduced, and secondly, the mechanical properties of the diaphragm will deteriorate

Method used

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  • Composite lithium battery membrane and method for making same
  • Composite lithium battery membrane and method for making same
  • Composite lithium battery membrane and method for making same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1. Get 0.7000g PEO (Mw~600,000), dry nano-SiO 2 (TS530) 0.0500g dissolved in 30ml CH 3 CN, stirred for 24 hours, the temperature was controlled at 80 °C, and the whole process was under N 2 under protection. After the mixture becomes a sol, transfer it to a petri dish, soak Celgard2400 in it for 1.2 hours, take it out and put it in a vacuum oven at 60°C for 48 hours, and wait for CH 3 After the CN was completely volatilized, a composite separator (PCS) with a thickness of about 25 μm was fabricated in this way.

Embodiment 2

[0024] Embodiment 2. Get 0.7000g PEO (Mw~600,000), dry nano-SiO 2 (TS530) 0.1400g dissolved in 40ml CH 3 In CN, the preparation process is the same as in Example 1, and a composite diaphragm PSi (TS530) (20%) with a thickness of about 25 μm is produced.

Embodiment 3

[0025] Embodiment 3. Get 0.7000g PEO (Mw~600,000), dry nano-SiO 2 (TS530) 0.0700g dissolved in 40ml CH 3 In CN, the preparation process is the same as in Example 1, and a composite diaphragm PSi (TS530) (10%) with a thickness of about 25 μm is produced.

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Abstract

The invention refers to a manufacturing method for a kind of compound polypropylene lithium membrane. The materials are base membrane, polymer and nano SiO2 fillers; the step is: the materials are solved in the solvent, the sol compound can be acquired, and then they are transferred to the culture dish, the membrane is immersed in them; the membrane is taken out and transferred to the template, the solvent is absorbed by the molecular sift, then they are transferred into the vacuum drying box to be dried. The invention emphasizes the humidity to membrane by the polymer and the improvement to the interface performance, the organic group component of the SiO2 surface is important to the performance of the compound membrane. The compound membrane upgrades the room temperature conductivity, and improves the interface performance of the positive material/membrane, lithium/membrane. The assembled battery has an excellent circular performance.

Description

(1) Technical field [0001] The invention relates to a diaphragm for a rechargeable lithium (lithium ion) battery, in particular to a novel composite polypropylene lithium battery diaphragm and a preparation method thereof. (2) Background technology [0002] A rechargeable lithium battery generally consists of a positive electrode, a negative electrode, a casing, a separator, an electrolyte, and a collector. Among them, the diaphragm is a very important part, because the function of the diaphragm is to separate the positive and negative electrodes of the battery and prevent the two poles from being short-circuited directly; the diaphragm itself is non-conductive, but it can allow electrolyte ions to pass through. In addition, the separator material must also have good chemical and electrochemical stability, good mechanical properties, and maintain high wettability to the electrolyte during repeated charging and discharging. [0003] In practical application, the diaphragm ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/22C08J9/00H01M50/446
CPCY02E60/12Y02E60/10
Inventor 杨勇程琥杜洪彦李涛
Owner XIAMEN UNIV
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