Polymer-based solid electrolyte with high room-temperature ionic conductance as well as preparation method and application thereof

A technology of solid electrolyte and ion conductance, applied in the direction of solid electrolyte, non-aqueous electrolyte, non-aqueous electrolyte battery, etc., can solve the problems of difficult mass production and industrialization, poor chemical stability, poor mechanical properties, etc., to achieve Improvement of mobility, improvement of mechanical properties, effect of enhancing mechanical properties

Active Publication Date: 2021-03-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the conductivity of the oxide solid electrolyte reaches 10 -4 S / cm, but the mechanical properties are not good, it is difficult to mass produce and realize industrialization, and there are problems such as physical contact of the electrodes; although the sulfide electrolyte can reach 10 -2 The ionic conductivity of S / cm, but its chemical stability is not good, it is easy to decompose and generate gas when it meets water, which greatly affects the performance of the battery, and there are problems such as space charge layer between the interface with the electrode; the conductivity of the polymer electrolyte is not as good as the former two (10 -7 ~10 -4 ), but the polymer electrolyte has good flexibility and processability, easy to prepare and produce on a large scale, and the polymer electrolyte is more friendly to the positive and negative electrodes, and the interface has high physical and chemical stability

Method used

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  • Polymer-based solid electrolyte with high room-temperature ionic conductance as well as preparation method and application thereof
  • Polymer-based solid electrolyte with high room-temperature ionic conductance as well as preparation method and application thereof
  • Polymer-based solid electrolyte with high room-temperature ionic conductance as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This example provides a simple method for preparing a polymer-based electrolyte with both rigidity and flexibility, such asfigure 1 As shown, the specific preparation steps are as follows:

[0044] (1) Add 0.5 g of two-dimensional hexagonal boron nitride nanosheets (h-BNNs) to isopropanol, and disperse them ultrasonically for 4 h. The edges of the hexagonal boron nitride nanosheets are modified to hydroxyl groups. The concentration of the solution is 4 mg / ml;

[0045] (2) Add the silane coupling agent KH-570 (MPS) to the dispersion obtained in (1), and ultrasonicate for 4 h at a power of 100 W. The surface of boron nitride nanosheets is grafted by MPS to obtain Boron nitride nanosheets, suction filtered and dried for later use, wherein the mass ratio of MPS to boron nitride nanosheets is 16:1;

[0046] (3) Add 0.25 g polyethylene oxide (PEO, molecular weight: 600,000) and 0.125 g LiTFSI to 10 g acetonitrile solution, stir for 12 h until uniform;

[0047] (4) Add 0.25 ...

Embodiment 2

[0054] This example provides a simple method for preparing a polymer-based electrolyte with both rigidity and flexibility. The specific preparation steps are as follows:

[0055] (1) Add 0.5 g of two-dimensional hexagonal boron nitride nanosheets (h-BNNs) to isopropanol, ultrasonicate for 4 h, the edges of hexagonal boron nitride nanosheets are modified to hydroxyl groups, and the boron nitride nanosheets solution The concentration is 4 mg / ml;

[0056] (2) Add the silane coupling agent KH-570 (MPS) to the dispersion obtained in (1), and ultrasonicate for 4 h at a power of 100 W. The surface of boron nitride nanosheets is grafted by MPS to obtain Boron nitride nanosheets, suction filtered and dried for later use, wherein the mass ratio of MPS to boron nitride nanosheets is 16:1;

[0057] (3) Add 0.25 g polyethylene oxide (PEO, molecular weight: 600,000) and 0.125 g LiTFSI to 10 g acetonitrile solution, stir for 12 h until uniform;

[0058] (4) Boron nitride nanosheets (h-BNNs...

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Abstract

The invention discloses a polymer-based solid electrolyte with high room-temperature ionic conductance as well as a preparation method and application thereof. The polymer-based solid electrolyte is formed by compounding main raw materials including a macromolecular polymer monomer, a micromolecular polymer monomer, a lithium salt and a boron nitride nanosheet through chemical action, wherein themass ratio of the macromolecular polymer monomer to the micromolecular polymer monomer to the lithium salt to the boron nitride nanosheet is 20-30:20-30:30-35:3-5. An in-situ cross-linking graft polymerization strategy is adopted, a precursor solution is directly dropwise added to an electrode plate, good contact can be achieved, and therefore interface impedance and interface side reactions are reduced, and the cycling stability of the whole battery is improved. The polymer-based electrolyte prepared by the invention has good electrochemical stability, thermodynamic stability and good ionic conductivity, provides a new thought for preparation and optimization of the polymer electrolyte, and is beneficial to industrialization of all-solid-state batteries.

Description

technical field [0001] The invention belongs to the technical field of all-solid-state batteries, and relates to a polymer electrolyte with excellent mechanical properties and high ionic conductivity and its preparation method and application, in particular to a method of grafting and cross-linking two-dimensional boron nitride materials prepared at room temperature Polymer-based electrolyte with high ionic conductivity and high mechanical strength, its preparation method and its application in solid-state batteries. Background technique [0002] The depletion of fossil energy has brought challenges to human beings, and people have tried many methods on the road to sustainable development. Among them, the secondary lithium-ion battery is a relatively reliable solution with good development prospects, and has been widely used in various fields. [0003] Since rocking chair lithium-ion batteries entered the market, lithium batteries have been extensively researched, and now t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/052
CPCH01M10/052H01M10/0565H01M2300/0082Y02E60/10
Inventor 王家钧安汉文娄帅锋左朋建尹鸽平
Owner HARBIN INST OF TECH
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