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Chargeable lithium ion cell polymer electrolyte and preparing method thereof

A technology of lithium-ion batteries and polymers, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of unstable liquid encapsulation and poor mechanical properties, and achieve high efficiency and simple process

Inactive Publication Date: 2004-09-15
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Gel-state and porous polymer electrolytes contain a large amount of liquid plasticizers. Although they have high conductivity, they still have disadvantages such as unstable liquid encapsulation and poor mechanical properties.

Method used

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  • Chargeable lithium ion cell polymer electrolyte and preparing method thereof
  • Chargeable lithium ion cell polymer electrolyte and preparing method thereof

Examples

Experimental program
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Effect test

example 1

[0043] Example 1: Preparation of polymethoxysiloxane (PMOS)

[0044] Put 152g TMOS (1mol) and 128g methanol into a four-necked reaction flask equipped with a thermometer, a mechanical stirrer, and a reflux tube, and stir and mix evenly. Water 18g, HCl 2×10 -4 mol of hydrochloric acid into the dropping funnel. Under vigorous stirring, hydrochloric acid was slowly dropped into the reaction flask for about 1 hour. After the dropwise addition was completed, the temperature was raised to reflux temperature. After reflux for 2 hours, methanol was distilled to 130°C. The temperature was then raised to 150°C and maintained for 3 hours with a stream of dry nitrogen. After cooling to room temperature, 104.0 g of a colorless and clear liquid product PMOS was obtained, with a reaction yield of 97.2%. After characterization, the molecular weight of the product is 1027, and the molecular structure can be expressed as [SiO 0.9769 (OH) 0.0585 (OCH 3 ) 1.991 ] 9.650 .

[0045] In th...

example 2

[0055] Example 2: Preparation of polyacrylmethylsiloxane (PAMOS)

[0056] Add 9.28g (0.08mol) of HEA, 200ppm of dibutyltin dilaurate and 200ppm of hydroquinone monomethyl ether into 10g of PMOS (S-3), heat to 90°C and react for 12h, then remove unreacted HEA under reduced pressure , cooled to obtain 15.02 g of colorless and clear product PAMOS, and the conversion rate of HEA was 74.84%. After characterization, the molecular weight of the product is 1543, and the molecular structure can be expressed as [SiO 0.907 (OH) 0.153 (OCH 3 ) 1.385 (OCH 2 CH 2 OCOCH=CH 2 ) 0.648 ] 9.486 .

[0057] When 10 g of PMOS (S-3) of the same weight was added with different weights of HEA, the molecular weight and structure of the resulting product PAMOS were different, as shown in Table 2.

[0058] The molecular weight and molecular formula of the product PAMOS obtained by different reaction ratios of table 2

[0059] PAMO HEA / S-3 Molecular Weight Molecular Formula

[0060] S (weight ...

example 3

[0072] Example 3 Preparation of Gel State Inorganic-Organic Hybrid Polymer Electrolyte

[0073] SE-2 is mixed evenly with 5wt.% photoinitiator Iragacure 184, and then mixed with different amounts of lithium-ion battery liquid electrolyte (1MLiPF 6 , EC:DEC:DMC=1:1:1w / w) mixed evenly, dripped into the stainless steel button battery case, and exposed to ultraviolet light for 0.5-3 minutes. The gel polymer electrolyte prepared in the coin cell case was covered with a stainless steel cap, packaged, and then tested for electrical conductivity. The results are shown in Table 4.

[0074] Table 4 Composition and Room Temperature Conductivity of Gel Polymer Electrolyte

[0075] No. Polymer Content Liquid Electrolyte Content Room Temperature Conductivity

[0076] 1M LiPF 6 , EC:DEC:DMC=1:1:1 (Scm -1 )

[0077] w / w

[0078] 1 # 5wt.% 95wt.% 8.42×10 -3

[0079] 2 # 10wt.% 90wt.% 3.59×10 -3

[0080] 3 #...

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Abstract

In the invention, polymer dielectric instead of liquid electrolyte is applied to lithium cell to produce cell in different shapes with performances of safety, lightweight and high energy density. In contrast, in prior art, there are disadvantages such as unstable liquid and bad mechanical properties in existed technique. Gel state inorganic-organic hybrid polymer dielectric is prepared through ultraviolet light radiation to trigger off polymerization. The polymer dielectric is amorphous in room temperature possessing features of high conductivity, stable thermal and mechanical properties. Advantages of ultraviolet light solidifying method are one-step molding, simple technique, high efficiency, no pollution. Performed polymer of inorganic-organic hybrid polymer is prepared by reconstructing end group after sol-gel reaction of alkoxyl silicon compound. In room temperature, ionic conductivity is reached to 8.4x10 to the power -3 Scm being close to conductivity of liquid electrolyte.

Description

technical field [0001] The invention relates to a rechargeable lithium ion battery polymer electrolyte and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic devices such as notebook computers and mobile phones because of their advantages such as high specific power, high energy density, high working voltage, light weight, small size, non-toxicity, and pollution-free. At present, the electrolytes used in lithium-ion batteries are basically non-aqueous electrolytes containing lithium salts, which have disadvantages such as leakage and poor safety. Therefore, people are working on the research work of replacing liquid electrolytes with polymer solid electrolytes (solid polymer electrolytes, SPEs). The polymer electrolyte is both an electrolyte and a separator in the battery. The application of polymer electrolytes in lithium-ion batteries is conducive to the preparation of batteries with safety, ligh...

Claims

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Application Information

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IPC IPC(8): H01M10/40
CPCY02E60/122
Inventor 邱玮丽杨清河马晓华付延鲍宗祥福
Owner FUDAN UNIV
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