Preparation method of rubidium-doped inorganic-organic lithium battery composite coating type diaphragm

A composite diaphragm and lithium battery technology, which is applied to secondary batteries, battery pack components, circuits, etc., can solve the problems of low ion transmission permeability, affecting lithium ion conductivity, and poor cycle performance, so as to improve safety performance and increase The effect of high electrochemical performance and ionic conductivity improvement

Pending Publication Date: 2021-01-26
光鼎铷业(广州)集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problems of low ion transmission and permeability in the prior art of the diaphragm, which affects the conductivity and poor circulation of lithium ions. The present invention provides a rubidium-doped lithium ion battery composite diaphragm and its preparation method

Method used

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  • Preparation method of rubidium-doped inorganic-organic lithium battery composite coating type diaphragm
  • Preparation method of rubidium-doped inorganic-organic lithium battery composite coating type diaphragm

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A rubidium-doped inorganic-organic lithium battery composite coating separator, with a dry-process single-drawn polyolefin porous diaphragm (thickness 8um, porosity 30%) as the base material, rubidium-doped TiO 2 and polyacrylic acid as the main raw materials are coated on the surface of the base film with a thickness of 12um; the specific preparation method is as follows:

[0031] (1) Prepare the dispersion slurry of the inorganic oxide precursor: add ethyl titanate to a mixed solvent with a volume ratio of ethanol / water of 20:80, mix evenly, and stir for 30 minutes to obtain a relatively uniform colloid, then add RbNO 3 (wherein the mass ratio of inorganic oxide precursor, rubidium salt, and mixed solvent is 5:1:100), adjust the pH by using HCl solution and NaOH solution, when the Zeta potential is 0, continue to drop the HCl solution until the Zeta potential is - 40mV, continue to stir for 30min, then transfer to the reactor for crystallization at 100°C for 12h, mix ...

Embodiment 2

[0037] A rubidium-doped inorganic-organic lithium battery composite coating separator, based on a dry-process single-drawn polyolefin porous diaphragm (thickness 10um, porosity 30%), rubidium-doped TiO 2 Coated with polyacrylic acid as the main raw material on the surface of the base film with a thickness of 14um; the specific preparation method is as follows:

[0038] (1) Prepare the dispersion slurry of the inorganic oxide precursor: add ethyl titanate to a mixed solvent with a volume ratio of ethanol / water of 20:80, mix evenly, and stir for 30 minutes to obtain a relatively uniform colloid, then add RbNO 3 (the mass ratio of the inorganic oxide precursor, rubidium salt, and mixed solvent is 5:2:100), adjust the pH by using HCl solution and NaOH solution, when the Zeta potential is 0, continue to drop the HCl solution until the Zeta potential is - 40mV, continue to stir for 30min, then transfer to the reactor for crystallization at 120°C for 12h, mix well and form a colloid ...

Embodiment 3

[0043] A rubidium-doped inorganic-organic lithium battery composite coating separator, with a dry-process single-drawn polyolefin porous diaphragm (thickness 12um, porosity 30%) as the base material, rubidium-doped TiO 2 Coated with polyacrylic acid as the main raw material on the surface of the base film with a thickness of 15um; the specific preparation method is as follows:

[0044] (1) Prepare the dispersion slurry of the inorganic oxide precursor: add ethyl titanate to a mixed solvent with a volume ratio of ethanol / water of 20:80, mix evenly, and stir for 30 minutes to obtain a relatively uniform colloid, then add RbNO 3 (the mass ratio of the inorganic oxide precursor, rubidium salt, and mixed solvent is 5:5:100), adjust the pH by using HCl solution and NaOH solution, when the Zeta potential is 0, continue to drop the HCl solution until the Zeta potential is - 40mV, continue to stir for 30min, then transfer to the reactor for crystallization at 120°C for 12h, mix well an...

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Abstract

The invention discloses a preparation method of a rubidium-doped inorganic-organic lithium battery composite diaphragm, which mainly comprises the following steps: (1) mixing an inorganic precursor with an ethanol-water mixed solvent and rubidium salt, regulating the pH value to 2-10, testing the Zeta potential to be 0, continuing to add an HCl solution until the Zeta potential is -40 mV, and crystallizing to form a colloidal solution; (2) adding polyacrylic acid into the dispersing solvent to form a viscous solution; (3) pouring the colloidal solution obtained in the step (1) into the viscoussolution obtained in the step (2), and adding a binding agent and a dispersing agent to form double-solution coating slurry; and (4) coating the surface of the porous polyolefin diaphragm with the coating slurry, and drying to obtain the rubidium-doped inorganic-organic lithium battery composite diaphragm. According to the rubidium-doped lithium ion battery composite diaphragm disclosed by the invention, due to the doping of rubidium ions, the space between crystal lattices is enlarged, the lithium ion conduction coefficient of the lithium ion battery diaphragm is facilitated, and the first effect and the cycle performance of lithium ions are further improved.

Description

technical field [0001] The invention relates to the field of lithium-ion battery diaphragms, in particular to a composite diaphragm with high safety performance, uniformly dispersed inorganic fillers, and a polymer matrix capable of large-scale industrial production. Background technique [0002] In response to the blowout development of new energy vehicles in my country, the research on lithium-ion battery technology is constantly being updated. However, the potential safety hazards of power batteries have always been a hot spot and focus of attention. According to media reports, from January 2019 to In the first ten days of August 2019, there were more than 40 fire accidents in electric vehicles, among which the shrinkage or melting of the battery separator would cause a short circuit between the positive and negative electrodes and thus cause a fire. In order to prevent the two poles from contacting and short circuit, and at the same time allow the electrolyte ions to pass...

Claims

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Application Information

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IPC IPC(8): H01M50/403H01M50/446H01M50/417H01M50/451H01M10/0525
CPCH01M10/0525Y02E60/10
Inventor 唐浩林王仲明陈智伟陈志华詹心泉
Owner 光鼎铷业(广州)集团有限公司
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