Unlock instant, AI-driven research and patent intelligence for your innovation.

Laminated composite electrolyte with interface optimization function and preparation method thereof

A composite electrolyte and interface optimization technology, applied in the field of laminated composite electrolytes and their preparation, can solve the problems of deteriorating interface characteristics and battery performance, lack of exploration of special functional groups, and reduced overall physical connectivity, etc. Stability, Li-ion rich environment, uniform deposition/dissolution effect

Pending Publication Date: 2022-07-29
JIANGSU UNIV OF TECH
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the transition from liquid electrolyte to solid electrolyte brings new challenges—interface issues: (1) poor solid-solid contact between positive and negative electrode materials and hard oxide electrolytes, especially during charge-discharge cycles In this process, the decomposition of electrode materials and the evolution of interfacial phases can lead to changes in stress / strain, resulting in the formation and propagation of cracks, delamination of the interface, and a decrease in the overall physical connectivity between particles and components, deteriorating interface characteristics and battery performance. ; (2) Poor chemical stability between the positive and negative electrode materials and the hard oxide electrolyte, resulting in side reactions such as element diffusion and redox on the interface
However, in solid-state battery systems, the application of coupling agents mainly emphasizes the reactivity of the alkoxy and alkyl chains in the coupling agent to inorganic and organic substances, respectively, and the exploration of the role of special functional groups is relatively lacking. Special functional groups have an important impact on the interface interaction of solid-state battery systems, which directly affects the interface properties and the overall performance of the entire battery system
There are many types of silane coupling agents. Among them, acrylamide-based silane coupling agents, because they contain highly active acrylamide groups, will have a special regulation effect on the interface properties of solid-state batteries, but related research is still relatively lacking.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Laminated composite electrolyte with interface optimization function and preparation method thereof
  • Laminated composite electrolyte with interface optimization function and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In step 1, 0.6 g of PEO and 0.25 g of lithium salt were added to 5 mL of acetonitrile, 10 μL of (3-methacrylamidopropyl) triethoxysilane coupling agent was added, and the mixture was heated and stirred at 45° C. for 1 h.

[0036] In step 2, the solution obtained in step 1 is cast in a glove box with a water and oxygen content of less than 0.1 ppm, and an acrylamidosilane-modified PEO-based organic electrolyte membrane is prepared by mold casting and solvent evaporation.

[0037] Step 3: After adding 10 μL of (3-methacrylamidopropyl) triethoxysilane to 0.1 g of LLZAO powder, press it into a disk with a diameter of 16 mm and a thickness of 150 μm to obtain acrylamidosilane-modified LLZAO inorganic electrolyte membrane.

[0038] In step 4, the organic electrolyte membrane, the inorganic electrolyte membrane and the organic electrolyte membrane obtained in steps 2 and 3 are stacked and pressed to obtain a laminated functional electrolyte.

Embodiment 2

[0040] In step 1, 0.6 g of PEO and 0.25 g of lithium salt were added to 5 mL of acetonitrile, 20 μL of (3-methacrylamidopropyl) triethoxysilane coupling agent was added, and the mixture was heated and stirred at 45° C. for 1 h.

[0041] Step 2 is the same as Step 2 of Embodiment 1.

[0042] Step 3: After adding 20 μL (3-methacrylamidopropyl) triethoxysilane to 0.1 g of LLZAO powder, press it into a disk with a diameter of 16 mm and a thickness of 150 μm to obtain acrylamidosilane-modified LLZAO inorganic electrolyte membrane.

[0043] Step 4 is the same as Step 4 of Embodiment 1.

Embodiment 3

[0045] Step 1, add 0.6 g PEO and 0.25 g lithium salt into 5 mL of acetonitrile, add 30 μL of (3-methacrylamidopropyl) triethoxysilane coupling agent, and heat and stir at 45° C. for 1 h.

[0046] Step 2 is the same as Step 2 of Embodiment 1.

[0047] Step 3: After adding 30 μL of (3-methacrylamidopropyl) triethoxysilane to 0.1 g of LLZAO powder, press it into a disk with a diameter of 16 mm and a thickness of 150 μm to prepare acrylamidosilane-modified LLZAO inorganic electrolyte membrane.

[0048] Step 4 is the same as Step 4 of Embodiment 1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Diameteraaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of functional electrolytes, and particularly relates to a laminated composite electrolyte with an interface optimization function, compared with a conventional alkoxy silane coupling agent, the adopted acrylamide silane coupling agent can play a role in coupling an organic / inorganic interface, and can also play a role in optimizing the interface. And multiple hydrogen bonds of acrylamide groups can be utilized to improve the environment of lithium ions and improve the conductivity of the electrolyte. Besides, acyloxy in the acrylamide group has relatively high lithium affinity, so that the diffusion behavior of lithium ions on the surface of the lithium negative electrode can be regulated and controlled, the deposition / dissolution of lithium is uniform, and the stability of an electrode / electrolyte interface is further improved. The above chemical effects are combined with the flexible physical characteristics of the organic components on the two sides of the laminated electrolyte, so that the rigid interface problem existing in a solid-state battery system can be effectively improved. The method is simple and easy to implement, low in cost and suitable for large-scale production and application.

Description

technical field [0001] The invention relates to the technical field of functional electrolytes, in particular to a laminated composite electrolyte with interface optimization function and a preparation method thereof. Background technique [0002] All-solid-state lithium batteries based on inorganic solid electrolytes, high-nickel ternary oxide positive electrodes, and metal lithium negative electrodes can avoid the natural and liquid leakage safety problems of liquid batteries because liquid electrolytes are not used. It is more convenient to package and has a larger market prospect. However, the transition from liquid electrolyte to solid electrolyte brings new challenges—interface issues: (1) Poor solid-solid contact between positive and negative electrode materials and hard oxide electrolytes, especially during charge-discharge cycles Decomposition of electrode materials and evolution of interfacial phases can lead to stress / strain changes leading to crack formation and...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01M10/056H01M10/052H01M10/0525
CPCH01M10/056H01M10/052H01M10/0525
Inventor 孙艳云姜汉丰
Owner JIANGSU UNIV OF TECH