Application of bis-triphenylamine-imide polymer in preparation of positive electrode for lithium battery

A technology of bis-triphenylamine and bis-triphenylamine, which is used in the preparation of lithium battery positive electrodes, in the field of bis-triphenylamine-imide polymers, can solve problems such as low average discharge voltage, and achieve high discharge specific capacity and Average discharge voltage, good cycle stability, low solubility

Active Publication Date: 2020-12-29
SOUTH CHINA NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the average discharge voltage of lithium batteries using carbonyl compounds as cathode materials is relatively low

Method used

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  • Application of bis-triphenylamine-imide polymer in preparation of positive electrode for lithium battery
  • Application of bis-triphenylamine-imide polymer in preparation of positive electrode for lithium battery
  • Application of bis-triphenylamine-imide polymer in preparation of positive electrode for lithium battery

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Effect test

preparation example Construction

[0042] 3. Preparation of positive electrode.

[0043]Add 20 drops of N-methylpyrrolidone solvent (NMP) (0.02 mg / drop) to 2 parts by mass of the binder PVDF, and stir for 1 h to form a slurry. Transfer 4 parts by mass of active material PDDP-NI and 4 parts by mass of conductive agent acetylene black into a ball mill jar, add the prepared slurry and ball mill for 1 hour, then add 5-8 drops of NMP and continue stirring for 1 hour (repeat 2 times). The slurry was obtained after ball milling for 4 hours, and the slurry was coated on an aluminum foil, and vacuum-dried at 80° C. for 24 hours to obtain a positive electrode.

Embodiment 2

[0044] Embodiment 2 of the present invention is: the application of bis-triphenylamine-imide polymer (PDDP-PI) in the preparation of lithium battery positive electrode, comprising the following steps:

[0045] 1. Synthesis of PDDP-PI.

[0046]

[0047] Under nitrogen protection, add 15g of imidazole to a 50mL three-necked flask and dissolve at 130°C, then add the DDP-NH prepared in Example 1 above 2 (0.88g, 2mmol), add 3,4,9,10-perylene tetracarboxylic dianhydride (3,4,9,10-Perylene-tetracarboxylic dianhydride, PTCDA) (0.44g, 2mmol) after the dissolution is complete to continue the reaction for 16h , cooled to 90 degrees Celsius and added 30mL methanol to continue the reaction for 5h. After the reaction, the product was added to 300mL methanol and stirred and filtered, and extracted with dichloromethane for 3 days, washed twice with dimethyl carbonate, and washed twice with acetone. After vacuum drying at °C for 24 h, dark red powder PDDP-PI (0.66 g, 40.7%) was obtained. ...

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Abstract

The invention discloses an application of a ditriphenylamine-imide polymer in preparation of a positive electrode of a lithium battery, and belongs to the field of lithium battery materials. The ditriphenylamine-imide polymer is a polymer containing a ditriphenylamine unit and an imide unit in a polymer chain, and anions and cations can be reversibly deintercalated at the same time. According to the positive electrode material, a conjugated imide compound with electrochemical activity is introduced into poly(ditriphenylamine), and the prepared polymer can simultaneously and reversibly deintercalate the anions and the cations, has the advantages of diphenylamine and the imide compound, has higher theoretical specific capacity than diphenylamine, and has higher average discharge voltage thanthe imide compound. The ditriphenylamine-imide polymer is relatively low in solubility in a common organic electrolyte, and has long cycling stability and high rate capability.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to the application of bis-triphenylamine-imide polymers in the preparation of positive electrodes of lithium batteries. Background technique [0002] Lithium batteries have been widely used in electric vehicles, mainly electric vehicles, and consumer electronics, mainly smartphones. However, the demand for lithium batteries in new energy vehicles and grid-scale energy storage stations is increasing. At the same time, commercialized inorganic cathode materials (such as LiCoO 2 and LiFePO 4 ) is difficult to further increase its energy density due to its theoretical specific capacity and structural instability. Therefore, there is a need to develop new low-cost rechargeable battery systems. Compared with the environmental resource constraints faced by inorganic cathode materials, organic compounds with reversible redox properties have high theoretical specific capacity, s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/60H01M4/137H01M10/052C08G73/10
CPCC08G73/1007C08G73/1067H01M4/137H01M4/606H01M10/052Y02E60/10
Inventor 侯琼陈莎张承君罗穗莲石光
Owner SOUTH CHINA NORMAL UNIVERSITY
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