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A lithium battery polymer cathode material, its preparation method and its battery

A positive electrode material and polymer technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor battery rate performance and cycle life, achieve low production costs, flexible molecular design, and improve safety performance.

Active Publication Date: 2019-08-02
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prior art discloses the use of small organic molecules containing benzothiophene groups as positive electrode materials, but when applied to lithium batteries, the rate performance and cycle life of the batteries are poor

Method used

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  • A lithium battery polymer cathode material, its preparation method and its battery
  • A lithium battery polymer cathode material, its preparation method and its battery
  • A lithium battery polymer cathode material, its preparation method and its battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0073] In the present application, the preparation method of the polymer cathode material at least includes: reacting the polymer represented by the formula IIIB with an oxidizing agent to obtain the polymer cathode material represented by the formula IIIA.

[0074]

[0075] As an improvement of the preparation method of the polymer cathode material of the present application, the reaction temperature is 20°C to 30°C, and the reaction time is 10 to 14 hours. The reaction process uses sodium tungstate as a catalyst and hydrogen peroxide as an oxidant, as shown in formula IIIB The molar ratio of polymer:hydrogen peroxide:sodium tungstate is 0.8~1.2:8~12:0.01~0.1.

[0076] In this application, the composition of the lithium battery is as described above.

[0077] The polymer cathode material of the present application has the advantages of flexible molecular design, simple synthesis method, low production cost, good process controllability, and large-scale development capabili...

Embodiment 1～3

[0079] The structural formula of the polymer cathode material of Examples 1 to 3 is shown in formula IIIA, and the specific selection of substituents is shown in Table 1:

[0080]

[0081] Table 1

[0082] Example R 11

R 12

R 13

R 14

R 21

R 22

R 23

R 24

Example 1 -CH 3

-CH 3

-CH 3

-CH 3

-H -H -H -H Example 2 -CH 2 CH 3

-CH 3

-CH 3

-CH 3

-H -H -H -H Example 3 -CH 3

-CH 3

-CH 3

-CH 3

-H -H -CH 3

-H

[0083] The structural formulas of the polymer cathode materials described in Examples 1 to 3 are shown in formulas IV, V, and VI respectively:

[0084]

[0085] Specifically, the preparation method of the polymer cathode material of the structural unit shown in Example 1 is:

[0086] Dissolve the polymer represented by formula IV A in chloroform, add sodium tungstate and hydrogen peroxide. Wherein, the polymer represented by ...

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Abstract

The invention relates to a polymer positive electrode material for a lithium battery. Particularly, a main chain of the polymer positive electrode material contains a succinimide group to adjust the solubility and the dispersity of a polymer, the affinity with an electrolyte and a material accumulation morphology. A side chain of the polymer positive electrode material contains a piperidine oxide group, which can react with electrons and lithium ions in battery charge and discharge processes. According to the polymer positive electrode material, the safety performance and the stability of the battery can be improved, the molecular design is flexible, the production cost is low and the polymer positive electrode material can be used for industrialized production on a large scale.

Description

technical field [0001] The present application relates to the field of lithium batteries, in particular, to a lithium battery polymer positive electrode material, a preparation method thereof, and a lithium battery using the material as a positive electrode active material. Background technique [0002] The working principle of traditional lithium secondary batteries is based on the ion intercalation mechanism, also known as lithium batteries. The negative electrode material uses metal lithium sheets as the lithium source, and the positive electrode active materials are mostly transition metal oxides or transition metal phosphates. Most of these cathode materials have complex preparation processes, lack of material resources, and high prices. Therefore, seeking low-cost and environmentally friendly cathode materials has become an important research direction for lithium batteries. [0003] The capacity of lithium batteries is mainly limited by the cathode material. In order...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/60H01M10/0525
CPCH01M4/608H01M10/0525Y02E60/10
Inventor 余林峰蒋治亿许金梅
Owner CONTEMPORARY AMPEREX TECH CO
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