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Inorganic/polymer composite lithium ion sieve membrane as well as preparation method and application thereof

A polymer film and polymer technology, applied in structural parts, electrochemical generators, electrolytes, etc., can solve the problems of increasing process complexity, difficulty in large-scale production, and reducing electrical conductivity, etc., to achieve low cost and high selectivity , good flexibility and mechanical strength

Active Publication Date: 2022-02-15
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process is not only complicated and difficult to achieve large-scale production, but also the coating polymer will remain on the surface of the conductive particles, thereby reducing the conductivity. It needs chemical etching, polishing, mechanical abrasion, refraction ion etching, ozone plasma treatment, Methods such as laser ablation to remove residual polymer further complicate the process

Method used

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  • Inorganic/polymer composite lithium ion sieve membrane as well as preparation method and application thereof
  • Inorganic/polymer composite lithium ion sieve membrane as well as preparation method and application thereof
  • Inorganic/polymer composite lithium ion sieve membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] This embodiment provides a method for preparing a composite lithium ion sieve membrane with a high content of inorganic particles, comprising the following steps:

[0047] 1. Weigh Li according to the mass ratio of 0.74g:0.305g:1.878g:4.128g 2 CO 3 , Al 2 o 3 , GeO 2 and NH 4 h 2 PO 4 Precursor, mixed by ball milling, the ratio of ball to material is 4:1, the speed is 400rpm, every 20 minutes of ball milling, stand still for 5 minutes, cycle 20 times; then heat treat the precursor, raise the temperature to 600 ℃ at 2 ℃ / min, keep it warm for 1 hour and then cool naturally; Next, the heat-treated precursor was ball-milled again, the ball-to-material ratio was 4:1, and the rotation speed was 400 rpm. Every 20 minutes of ball milling, it was left to stand for 5 minutes, and the cycle was repeated 20 times.

[0048] 2. The precursor powder after ball milling was heated up to 900°C at a heating rate of 2°C / min for sintering, kept for 6 hours and cooled naturally to obt...

Embodiment 2

[0053] The preparation method of the LAGP-PE composite lithium ion sieve membrane in this example is the same as that in Example 1, except that the thickness of the PE membrane is 30 μm.

[0054] At room temperature, test the electrochemical impedance of the LAGP-PE composite lithium ion sieve membrane in this embodiment, the test results are as follows Figure 5 (a) shown. It is calculated that the ion conductivity of the LAGP-PE composite lithium ion sieve membrane in this example can reach 3.0*10 -5 S / cm, which basically meets the requirements of electrolyte conductivity for lithium batteries operating at room temperature.

[0055] Figure 5 (b) is an Arrhenius curve of the ion conductivity of the LAGP-PE composite lithium ion sieve membrane based on the present embodiment as a function of temperature. It can be seen from the graph that the ionic conductivity and temperature of the LAGP-PE composite ion sieve membrane satisfy the Arrhenius linear relationship, which is t...

Embodiment 3

[0057] The preparation method of the LAGP-PE composite lithium ion sieve membrane in this example is the same as that in Example 1, the only difference being that the particle size range of the LAGP electrolyte particles is 42.4-49.4 μm.

[0058] Seal the white anhydrous copper sulfate in the test tube with LAGP-PE composite lithium ion sieve membrane, then immerse it in water, and observe the color change of the anhydrous copper sulfate regularly. Anhydrous copper sulfate gradually turned blue after 120 hours, indicating that the LAGP-PE composite lithium ion sieve membrane has good sealing performance.

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Abstract

The invention discloses a preparation method of an inorganic / polymer composite lithium ion sieve membrane, which comprises the following steps: S1, placing thermoplastic polymer particles between two high-temperature-resistant membranes, heating to soften the thermoplastic polymer particles, and rolling the thermoplastic polymer particles into a polymer membrane; s2, removing the high-temperature-resistant film on one side of the polymer film, heating to soften the polymer film, and uniformly paving inorganic electrolyte particles on the surface of the polymer film; s3, applying pressure to enable the inorganic electrolyte particles to be adhered to the polymer film, and then removing the inorganic electrolyte particles which are not adhered to the polymer film; and S4, placing the polymer film adhered with the inorganic electrolyte particles between two high-temperature-resistant films, and embedding the inorganic electrolyte particles into the polymer film through hot pressing to obtain the inorganic / polymer composite lithium ion sieve film. The prepared inorganic / polymer composite lithium ion sieve membrane has good lithium ion selectivity, and the risk that a composite electrolyte membrane is punctured by lithium dendrites is avoided.

Description

technical field [0001] The invention relates to the technical field of solid lithium ion electrolyte membranes, in particular to an inorganic / polymer composite lithium ion sieve membrane and its preparation method and application. Background technique [0002] Solid-state lithium-ion electrolytes have broad application prospects in the fields of energy storage conversion and lithium resource development. On the one hand, solid-state lithium-ion electrolytes can avoid the safety problems caused by the volatile and flammable organic electrolytes in lithium batteries; on the other hand, solid-state lithium-ion electrolytes with lithium-ion selectivity can be used to extract Lithium, to solve the problem of shortage of terrestrial lithium resources. Solid-state lithium-ion electrolytes can be divided into polymer electrolytes, inorganic electrolytes, and inorganic / polymer composite electrolytes. Inorganic / polymer composite electrolytes combine the high ionic conductivity of in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525C08J5/22C08L23/06C08K3/32
CPCH01M10/0525H01M10/0565C08J5/2231H01M2300/0082H01M2300/0071C08J2323/06C08K3/32Y02E60/10
Inventor 何平杨金贵王义钢潘慧张语萌周豪慎
Owner NANJING UNIV
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