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Preparation method of solid electrolyte

A solid electrolyte and electrolyte technology, applied in non-aqueous electrolyte batteries, circuits, secondary batteries, etc., can solve problems such as hindering the commercial application of solid lithium metal batteries, difficult to change the crystalline state of the polymer phase, and uneven size of inorganic particles. , to achieve the effect of improving ionic conductivity, improving strength, and simple preparation method

Pending Publication Date: 2022-05-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, among the mainstream composite electrolytes, both inorganic electrolytes and amorphous polymer electrolytes can provide Li + Transmission channel, Li + The transmission speed also depends on the degree of dispersion of the inorganic phase particles in the polymer phase and the degree of amorphousness of the polymer phase; at the same time, due to the non-uniform size of the inorganic particles, the contact between the inorganic phase and the polymer phase is small, and the It is difficult to change the crystalline state of the polymer phase, and in fact, the improvement of ionic conductivity is relatively limited, which also greatly hinders the commercial application of solid-state lithium metal batteries

Method used

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Examples

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preparation example Construction

[0020] The invention provides a method for preparing a solid electrolyte of a dual polymer system, comprising:

[0021] S1) dissolving the polymer electrolyte in an organic solvent, and stirring in the dark until completely dissolved;

[0022] S2) adding the photopolymerizable polymer electrolyte and initiator and stirring in the dark until completely dissolved to form a transparent solution;

[0023] S3) adding lithium salt and fully stirring until transparent, and then performing photopolymerization under a purple light for 10-20 minutes;

[0024] S4) Vacuum drying to prepare a solid electrolyte membrane rich in lithium salt.

[0025] Among them, the present invention has no special limitation on the sources of all raw materials, which can be commercially available.

Embodiment 1

[0028] 1) Weigh PVDF-HFP, PEGDA, DMF, 369 photoinitiator and LiFSI respectively according to the mass ratio of 1:0.1:10:0.002:1.1. Add PVDF-HFP to DMF and stir at a speed of 650 rpm for 5 hours;

[0029] 2) Add PEGDA and 369 photoinitiator at the same time, keep stirring at a rotating speed for 2 hours; add LiFSI and continue stirring for 5 hours;

[0030] 3) Pour the solution into a petri dish, irradiate with a 6-10W ultraviolet lamp for 20 minutes, and then put the petri dish in an oven at 60° C. to dry for 5 hours to obtain a solid electrolyte membrane.

[0031] The solid electrolyte obtained in Example 1 was assembled into a stainless steel / solid electrolyte / stainless steel battery, and the ionic conductivity of the solid electrolyte was tested at 25°C to be 8.2·10 -4 S cm -1 .

Embodiment 2

[0033] 1) Weigh PVDF-HFP, PEGDA, DMF, 369 photoinitiator and LiFSI according to the mass ratio of 1:0.2:10:0.004:1.2. Add PVDF-HFP to DMF, and stir at a speed of 600 rpm for 3 hours;

[0034] 2) Add PEGDA and 369 photoinitiator at the same time, keep stirring for 1 hour at the rotating speed; add LiFSI and continue stirring for 3 hours;

[0035] 3) Pour the solution into a petri dish, irradiate with a 6-10W ultraviolet lamp for 20 minutes, and then place the petri dish in an oven at 60° C. to dry for 3 hours to obtain a solid electrolyte membrane.

[0036] The solid electrolyte obtained in Example 1 was assembled into a stainless steel / solid electrolyte / stainless steel battery, and the ionic conductivity of the solid electrolyte was tested at 25°C to be 5.8·10 -4 S cm -1 .

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Abstract

The invention provides a preparation method of a solid electrolyte, which comprises the following steps: S1) enabling a polymer to form a staggered network through free radical reaction, and activating by virtue of an initiator to prepare a composite solid electrolyte in which multiple components are crosslinked or polymer skeletons are mutually communicated to construct an internal three-dimensional ion pathway component; and S2) preparing the novel solid electrolyte with high ionic conductivity by regulating and controlling the proportion of the lithium salt polymer. Compared with the prior art, the polymer monomers are polymerized and crosslinked to form a network in a photopolymerization manner, so that the strength of the solid electrolyte is improved, abundant sites combined with lithium salt are provided, the formation of an amorphous region is promoted, and the transmission of ions in the solid electrolyte is accelerated, thereby realizing high ionic conductivity at room temperature; the electrochemical stability and the rate capability of the lithium metal battery are favorably improved.

Description

technical field [0001] The invention belongs to the technical field of lithium metal batteries, and in particular relates to a preparation method of a solid electrolyte with high ion conductivity. Background technique [0002] Commercial lithium-ion batteries have been widely used since they were introduced in 1991 due to their high performance and high capacity. However, with the continuous improvement of the energy density and safety requirements of lithium-ion batteries, people are gradually turning their attention to new all-solid-state lithium metal batteries. By replacing liquid electrolytes with solid electrolytes, it is also key to achieve high energy density, long cycle life, and high safety in solid-state lithium metal batteries. [0003] Among solid-state electrolytes, polymer solid-state electrolytes have high safety and excellent mechanical properties, can be in good contact with positive and negative electrodes, and are also low-cost. They are considered to be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/28C08L27/16C08L71/02C08K5/435H01M10/0565H01M10/052
CPCC08J3/28H01M10/0565H01M10/052C08J2327/16C08J2471/02C08K5/435
Inventor 欧星方绍钧张宝明磊
Owner CENT SOUTH UNIV