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Multiple sulpho conjugated polymer for lithium battery anode material

A conjugated polymer, cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as self-discharge and specific capacity reduction, poor cycle performance, utilization rate and cycle life impact

Inactive Publication Date: 2007-05-23
NO 63971 TROOPS PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Organodisulfides and polyorganodisulfides generate RS respectively during discharge - m + and + m - SRS - m + Ionic compounds, which are then dissolved in the electrolyte, lead to a decrease in self-discharge and specific capacity, so their utilization and cycle life in lithium batteries are affected,
[0006] Although the above literatures have reported various positive electrode active materials that are expected to be used to make lithium batteries with high specific capacity and good cycle life, they all have small molecules of alkali metal sulfide or organic sulfide that are easy to dissolve in the electrolyte during the discharge process. Causes low utilization rate of active substances and poor cycle performance

Method used

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  • Multiple sulpho conjugated polymer for lithium battery anode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 11.5g (0.36mol) sulfur, 21.6g (0.09mol) sodium sulfide nonahydrate (Na 2 S·9H 2 O) and 150ml of DMF were added to a 250ml three-necked round-bottomed flask, and refluxed for 6h under nitrogen protection. Afterwards, 3.1g (0.016mol) of trichloropolyaniline was added and reacted at 120-130°C for 18h, filtered, and washed with 50ml of distilled water. ×8, with AgNO 3The solution was detected to have no turbidity, soaked in 0.1mol / L ammonia water overnight, washed with acetone until the filtrate was colorless, and dried in vacuum at 50°C for 24 hours to obtain 3.4g of black powdery solid polythiopolyaniline. Elemental analysis results (wt%): N 4.62, C 25.14, H 0.98, Cl 1.54, S 48.08.

Embodiment 2

[0028] 11.5g (0.36mol) sulfur, 21.6g (0.09mol) sodium sulfide nonahydrate (Na 2 S·9H 2 O), 100ml DMF and 50ml H 2 O was added to a 250ml three-necked round-bottomed flask, and refluxed for 8h under nitrogen protection, then 3.1g (0.016mol) of trichloropolyaniline was added, and refluxed for 24h. After the reaction is over, pour the reaction solution into 300ml 1mol / L hydrochloric acid solution, filter, wash with distilled water 50ml×10, wash with AgNO 3 The solution was detected to have no turbidity, soaked in 0.1mol / L ammonia water overnight, washed 80ml×16 with 0.1mol / L ammonia water, triturated and washed with acetone until the filtrate was colorless, dried in vacuum at 50°C for 24h, and obtained 3.2g black powdery solid polythio polyaniline. Elemental analysis results (wt%): N 4.65, C 25.14, H 0.48, Cl 1.12, S 66.70.

Embodiment 3

[0030] 3.84g (0.12mol) sulfur, 7.2g (0.03mol) sodium sulfide nonahydrate (Na 2 S·9H 2 (2), 30ml 95% ethanol was added in a 100ml single-necked round bottom flask, and reflux reaction was carried out under nitrogen protection for 8h to obtain disodium pentasulfide solution.

[0031] 2.9g (0.015mol) of trichloropolyaniline, 0.359g (0.0015mol) of tetraethylammonium bromide and 60ml of DMF were successively added to a 250ml three-necked round-bottomed flask, and then under the protection of nitrogen, the spare disulfide pentasulfide Sodium solution was added to the reaction flask, and the reflux reaction was continued for 24h. After the reaction, pour the reaction solution into 200ml water, filter, wash with distilled water 50ml×10, and wash with AgNO 3 The solution was detected to be free of turbidity, washed with acetone until the filtrate was colorless, extracted with carbon disulfide for 5 hours, and dried in vacuum at 180°C for 3 hours to obtain 2.3 g of black powdery solid...

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Abstract

The invention relates to a high specific capacity multi sulfur substitution conjugated polymer anode active substance for lithium battery anode, prepared in a division solvent by multi halogenating conjugated polymer with alkali metal multi sulfide.each repeating structural element of the multi halogenating polymer is linked to the multi sulfur chain through the carbon-sulfur bond.The initial specific capacity of the anode material is higher than 500mAh / g, showing good circularity.

Description

Technical field [0001] The invention relates to the preparation of positive electrode material polythioconjugated polymer positive electrode active material and its application in lithium batteries. Background technique [0002] With the rapid development of social economy and the rapid development of science and technology, lithium batteries are widely used in social, technological and military fields such as communication tools, office equipment, and instrument remote sensing. Features such as high specific capacity, long cycle life or high specific power, safety and pollution-free are the direction of future battery development. It is well known that sulfides containing S-S functional groups can undergo the following redox reactions: <chemistry num="001"> <chem file="02120846_cml001.xml" / > < / chemistry> Based on this property, this type of material containing S-S functional groups can be used as the positive electrode active material of the battery. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/60H01M4/62
CPCY02E60/10
Inventor 苑克国曹高萍王安邦杨裕生
Owner NO 63971 TROOPS PLA
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