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A kind of polymer cathode material and its preparation method and a kind of solid lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of damaging battery charging and discharging speed and energy density, changing electrolyte salt concentration distribution, etc., to improve charging and discharging speed and energy Density, Effects of Accelerated Charge Replenishment Capability

Active Publication Date: 2021-07-09
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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  • A kind of polymer cathode material and its preparation method and a kind of solid lithium ion battery
  • A kind of polymer cathode material and its preparation method and a kind of solid lithium ion battery
  • A kind of polymer cathode material and its preparation method and a kind of solid lithium ion battery

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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 present invention provides a polymer positive electrode material having a structure shown in formula I. When the polymer positive electrode material provided by the present invention is positively charged during charging and discharging of PTMA, the anions grafted on the polymer skeleton can maintain charge balance and It is conducive to the uniform distribution of anions, and the anion structure containing fluorine and strong delocalization ability is conducive to the dissociation of anions in the electrolyte and the migration of lithium ions, accelerates the charge replenishment ability, and improves the charge and discharge speed and energy density of the battery.

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 Patents(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