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Polymer positive electrode material and preparation method thereof and solid-state lithium ion battery

A lithium-ion battery and cathode material technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve problems such as damage to battery charge and discharge speed and energy density, change electrolyte salt concentration distribution, etc., to improve charge and discharge speed and energy. Effects of Density, Accelerated Charge Replenishment Ability

Active Publication Date: 2020-04-07
SAIC MOTOR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PTMA will be oxidized into positively charged substances during charge and discharge, and the anions in the electrolyte will gather near the positive electrode to maintain charge balance, which will change the electrolyte salt concentration distribution and damage the charge and discharge speed and energy density of the battery.

Method used

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  • Polymer positive electrode material and preparation method thereof and solid-state lithium ion battery
  • Polymer positive electrode material and preparation method thereof and solid-state lithium ion battery
  • Polymer positive electrode material and preparation method thereof and solid-state lithium ion battery

Examples

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preparation example Construction

[0053] The present invention has no special limitation on the preparation of the positive electrode, and the preparation method of the solid lithium ion battery known to those skilled in the art is enough. In the present invention, the positive electrode can be prepared according to the following method:

[0054] mixing a compound having a structure shown in formula I, a binder, a homopolymer of lithium salt monomer (III), a carbon material, and a solvent to obtain a slurry;

[0055] After coating the slurry on the surface of the current collector and drying it, a positive electrode is obtained;

[0056] The homopolymer of the lithium salt monomer (III) has the structure of formula V

[0057]

[0058] Wherein, the number average molecular weight of the homopolymer (formula V) of the lithium salt monomer (III) is 3000-10000.

[0059] The binder is selected from PVDF or PTFE, the carbon material is selected from conductive acetylene or graphite conductive agent, the solvent ...

Embodiment 1

[0064] Example 1, R 1 for CH 3 , R 2 for CH 3 , R 3 for CH 3 , R 4 for CH 3 ;

Embodiment 2

[0065] Example 2, R 1 for CH 2 CH 3 , R 2 for CH 2 CH 3 , R 3 CH 2 CH 3 for, R 4 for CH 2 CH 3 ;

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Abstract

The invention provides a polymer positive electrode material with a structure represented by a formula I; according to the polymer positive electrode material provided by the invention, when PTMA is charged and discharged with positive charges, anions grafted on a polymer skeleton can maintain charge balance and are beneficial to uniform distribution of the anions, the fluorine-containing anion structure with strong delocalization capability is beneficial to dissociation of the anions in an electrolyte and migration of lithium ions, the charge supplement capability is accelerated, and the charge and discharge speed and the energy density of a battery are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a polymer positive electrode material, a preparation method thereof and a solid-state lithium-ion battery. Background technique [0002] Lithium battery cathode material is a key factor that determines the performance of lithium battery. Commonly used inorganic cathode materials are lithium-containing oxides, which have disadvantages such as low theoretical capacity and potential safety hazards. Organic polymer cathode materials have the advantages of high theoretical specific capacity, designable structure, and safe system. Among them, 2,2,6,6-tetramethylpiperidine-1-nitroxyl radical (TEMPO) radical polymer ((PTMA) has the advantages of fast charge and discharge speed, high output voltage, and stable chemical properties. , is a class of positive electrode materials with good development prospects. However, PTMA will be oxidized into positively charged...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/34C08F212/14H01M4/60H01M10/0525
CPCC08F212/14C08F220/34H01M4/604H01M10/0525Y02E60/10
Inventor 任超时朱冠楠冯奇
Owner SAIC MOTOR