A class of rapid charge and discharge positive electrode active materials, preparation method and applications thereof

A cathode active material, charging and discharging technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low specific capacity of electrode materials, low utilization rate of active sites, increase energy density, etc., and achieve excellent cycle stability performance , excellent electrochemical performance, the effect of improving rate performance

Active Publication Date: 2019-01-25
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another effective way to improve cycle performance and rate performance is to construct a covalent organic network to inhibit or even eliminate decomposition in the electrolyte and provide faster ion diffusion channels. However, this electrode material with a covalent organic network structure Usually the specific capacity is not high
For now, it is generally believed that although ther

Method used

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  • A class of rapid charge and discharge positive electrode active materials, preparation method and applications thereof
  • A class of rapid charge and discharge positive electrode active materials, preparation method and applications thereof
  • A class of rapid charge and discharge positive electrode active materials, preparation method and applications thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A fast charge-discharge positive electrode active material, and its preparation method includes the following steps:

[0034] Pyromellitic dianhydride (873mg, 4mmol), oxamide (360.33mg, 4mmol), zinc acetate (807.257mg, 4.4mmol) and imidazole (10g) were added to a 100ml single-necked flask in sequence, stirred and heated to 90°C. After the imidazole is fully melted and continue to heat up to 150°C, keep stirring and react for 24h; after the reaction is over, stop heating, and the system is naturally cooled to room temperature, then wash with water, dry the filter cake, wash the filter cake with dimethyl sulfoxide, and vacuum dry, The product was 1.04 g, with a yield of 86%.

Embodiment 2

[0036] A fast charge-discharge positive electrode active material, and its preparation method includes the following steps:

[0037] Add naphthalene tetracarboxylic dianhydride (1.07g, 4mmol), oxamide (324.297mg, 3.6mmol), zinc acetate (733.87mg, 4mmol) and imidazole (10g) into a 100ml single-necked flask in sequence, stir and warm to 90°C. After the imidazole is fully melted, the temperature is continued to be increased to 150° C., and the reaction is kept under stirring for 24 hours; after the reaction is completed, the heating is stopped, the system is naturally cooled to room temperature, and then washed with water, and the filter cake is dried. The filter cake was washed with dimethyl sulfoxide and dried in vacuum. The final product was 1.12 g with a yield of 79%.

Embodiment 3

[0039] A fast charge-discharge positive electrode active material, and its preparation method includes the following steps:

[0040] Add perylene tetracarboxylic dianhydride (1.57g, 4mmol), oxamide (360.33mg, 4mmol), zinc acetate (733.87mg, 4mmol) and imidazole (10g) into a 100ml single-necked flask, stir and warm up to 90℃, and wait for the imidazole After being fully melted, continue to heat up to 150°C and keep stirring for 24 hours. After the reaction is over, stop heating. After the system is naturally cooled to room temperature, wash with water, dry the filter cake, wash the filter cake with dimethyl sulfoxide, and vacuum dry. The final product 1.37g, the yield is 72%.

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Abstract

The invention discloses a class of rapid charge and discharge positive electrode active materials. According to the present invention, the used imide-based small molecules form pi-pi stacking on the plane of a benzene ring, such that the rapid charge and discharge positive electrode active material has good conductivity and insolubility in most common solvents, and is the ionic battery positive electrode material with potential; oxamide and a tetracarboxylic axid dianhydride small molecule are subjected to a reaction to form a polymer, such that the synthesis of the polymer can effectively reduce the solubility in the electrolyte and improve the cycle stability; and by introducing the additional carbonyl between the monomers, the stack of the carbonyl between the molecules form a new ion transport channel to greatly improve the ion transport efficiency, such that the cycle performance and the rate performance of the prepared alkali metal ion battery are substantially improved. The chemical structure general of the imide polymer is defined in the specification.

Description

Technical field [0001] The invention belongs to the technical field of electrode active materials for alkali metal ion batteries, and specifically relates to a type of fast charge-discharge positive electrode active materials, a preparation method thereof, and applications in alkali metal ion batteries. Background technique [0002] With the gradual depletion of oil and other energy sources, the development and storage of new energy has gradually become the focus of social attention. Lithium-ion batteries have been widely used in various small electronic devices and electric vehicles as energy storage devices due to their excellent performance. However, the content of lithium in nature is limited, and with uninterrupted mining, its price is increasing. Sodium and potassium, which are in the first main group with lithium, not only have similar chemical properties to lithium, but also have reserves far exceeding lithium in the earth's crust, so sodium-ion batteries and potassium-i...

Claims

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Application Information

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IPC IPC(8): C08G73/10H01M4/60H01M10/054
CPCC08G73/1082H01M4/608H01M10/054Y02E60/10
Inventor 高翔顾诚俊刘治田
Owner WUHAN INSTITUTE OF TECHNOLOGY
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