Polarity binding agent applied to lithium-sulfur battery and preparation method of polarity binding agent

A lithium-sulfur battery and adhesive technology, which is applied in the manufacture of electrodes, battery electrodes, electrolyte storage batteries, etc., can solve the problems of poor adsorption capacity of polysulfides, failure to meet the needs of practical applications, and limited adsorption performance. Low cost, improved cycle performance, and simple preparation process

Inactive Publication Date: 2018-03-30
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Description
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Problems solved by technology

However, the adsorption performance of the above-mentioned adhesives on lithium polysulfide is greatly limited by the functional groups in the material, mainly hydroxyl, ketone, ester

Method used

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  • Polarity binding agent applied to lithium-sulfur battery and preparation method of polarity binding agent
  • Polarity binding agent applied to lithium-sulfur battery and preparation method of polarity binding agent
  • Polarity binding agent applied to lithium-sulfur battery and preparation method of polarity binding agent

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Embodiment

[0030] A preparation method for a polar adhesive applied to a lithium-sulfur battery, specifically comprising the following steps:

[0031] Step 1. After ultrasonically cleaning 30g of dehydration molecular sieves with alcohol for 5 times, bake them in an oven at 100°C for 24 hours to completely remove the moisture in the molecular sieves;

[0032] Step 2. Put the molecular sieve after dehydration in step 1 into 800mL dimethylformamide (DMF), remove the moisture in the DMF, and obtain the DMF after dehydration. When taking the dehydration DMF, use a pipette to absorb upper liquid;

[0033] Step 3, be the polyethyleneimine (PEI) that molecular weight is 800g / mol as solute, the DMF solution (dimethylformamide) that removes water is solvent, the concentration of preparation polyethyleneimine (PEI) is 0.25mol / L The mixture A;

[0034] Step 4, be the polyethylene glycol diglycidyl ether (PEGDGE) that molecular weight is 600g / mol as solute,, the DMF solution (dimethylformamide) th...

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Abstract

The invention relates to a polarity binding agent applied to a lithium-sulfur battery and a preparation method of the polarity binding agent, and belongs to the technical field of a battery binding agent. The binding agent is a polymer obtained by performing reaction of polyethylenimine and polyethylene glycol diglycidyl ether for 3-6 hours under a temperature of 100-150 DEG C according to a moleratio being 1:(0.5-4), wherein the polyethylenimine and a polysulfide are polarly absorbed to form a bond by amino group or amide group of the polyethylenimine so as to achieve the purpose of preventing the polysulfide from being dissolved, and the polyethylene glycol diglycidyl ether is used for hinging the polyethylenimine to form a three-dimensional structure. A strong polar functional group (such as amino group, amide group and hydroxyl) is contained in the binding agent, a large amount of chemical bonds can be formed with the polysulfide under the condition that certain mechanical strength is maintained, the polysulfide is effectively prevented from being dissolved, and the cycle property of the lithium-sulfur battery is improved.

Description

technical field [0001] The invention relates to the technical field of battery adhesives, in particular to a highly polar adhesive applied to lithium-sulfur batteries and a preparation method thereof. Background technique [0002] Lithium-sulfur battery (Li-S) is a kind of lithium-ion battery. Its theoretical specific capacity is as high as 1675mAh / g, and its theoretical specific energy reaches 2600Wh / kg, which is 4-5 times that of current commercial lithium batteries. performance energy storage materials. However, under the repeated intercalation of lithium ions, the active material (S) has a volume change of up to 70% and a large amount of intermediate product-lithium polysulfide dissolves, causing serious capacity fading, which has become the main difficulty in commercial production. [0003] The binder plays a role in connecting the active material and the conductive agent (such as acetylene black, Ketjen black, Super P, etc.) in the cathode material of the lithium-sulf...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/04H01M4/139H01M10/058C08G81/00
CPCC08G81/00H01M4/0404H01M4/139H01M4/622H01M4/628H01M10/058Y02E60/10Y02P70/50
Inventor 熊杰陈伟雷天宇邬春阳戴丽萍
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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