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Flexible solid-state battery containing electron conduction interface layer and preparation method thereof

An electronic conduction and solid-state battery technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, secondary batteries, etc., can solve the problems of slow self-diffusion, poor interface contact between lithium and electrolyte, and reduced cycle life of half-cells and full-cells. question

Inactive Publication Date: 2020-10-20
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, vacancies will be formed on the lithium surface during the electrochemical process. Due to the slow self-diffusion speed of lithium atoms filling the vacancies, the vacancies on the lithium surface will increase, which will make the interface contact between lithium and electrolyte poor.
Two aspects reduce the cycle life of half-cells and full-cells

Method used

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  • Flexible solid-state battery containing electron conduction interface layer and preparation method thereof
  • Flexible solid-state battery containing electron conduction interface layer and preparation method thereof
  • Flexible solid-state battery containing electron conduction interface layer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Weigh 0.375g LiFePO respectively 4 , 0.05g super-P, 0.075g PEO-LiTFSI electrolyte, stirred by a slurry machine, mixed evenly, coated on a 4×5cm carbon-coated aluminum foil with a spatula, and dried at 60°C for 24h before use. Then dissolve 0.44g PEO and 0.1435g LiTFSI in 10mL of anhydrous acetonitrile, stir for 24h, apply it on the positive electrode layer with a spatula, place it in a drying room with a dew point of -60°C for 3h at room temperature, and volatilize at 50°C for 12h to remove the solvent , forming a polymer electrolyte layer. Then, in a drying room with a dew point of -60°C, using a magnetron sputtering apparatus, by controlling the sputtering current and sputtering time, a 5nm metal platinum layer was deposited on the polymer layer as an electron-conducting interface layer. On the electron-conducting interface layer, a metal lithium strip is placed, and a pressure of 8 MPa is applied to ensure good contact at the interface (observed by scanning the cros...

Embodiment 2

[0052] The flexible pouch battery was prepared according to the operation of Example 1, except that the thickness of the electron conducting interface layer-metal platinum layer was changed to 2nm, 8nm and 11nm.

[0053] In order to test the effect of different thicknesses of the electronic conduction interface layer-metal platinum layer on the stable interface, at 50°C, 0.1mAcm -2 At current density, 0.1mAh cm -2 Charge and discharge test under capacity. like Figure 5 As shown, the modification of different platinum layers (Pt-2, Pt-5, Pt-8, Pt-11 electrolyte) makes the cycle life of lithium-lithium half-cells respectively 1200, 2000, 1600, 1300h, and no platinum layer Compared with the modified (Pt-0 electrolyte), there is a significant improvement, showing the role of the platinum layer in stabilizing the interface. Similarly, it shows that the thickness of the electron-conducting interface layer has a great influence on the cycle life. As the thickness increases, the p...

Embodiment 3

[0055] Weigh 0.375g LiCoO 2 , 0.05g Ketjen Black, 0.075g PAN-LiClO 4 The electrolyte was stirred and mixed evenly with a slurry machine, coated on a 4×5cm carbon-coated aluminum foil with a spatula, and dried at 80°C for 24 hours for use. Then 0.44g PAN and 0.08gLiClO 4 Dissolve in 10mL dimethylformamide solution, stir for 24 hours, apply it on the positive electrode layer with a spatula, place it in a drying room with a dew point of -60°C, and volatilize at 80°C for 24 hours to remove the solvent to form a polymer electrolyte layer. Then, in a drying room with a dew point of -60° C., a 5 nm metallic silver layer was deposited on the polymer layer as an electron-conducting interface layer by controlling the time by atomic layer deposition. On the electron-conducting interface layer, a metal lithium strip is placed, and a pressure of 8 MPa is applied to ensure the contact of the interface. Finally, it is sealed with aluminum-plastic film, and the tabs are welded to assemble ...

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Abstract

The invention discloses a flexible solid-state battery containing an electron conduction interface layer and a preparation method thereof. The flexible solid battery comprises a positive electrode layer, a flexible polymer electrolyte layer and a metal lithium negative electrode layer. The flexible solid-state battery further comprises an electron conduction interface layer, the electron conduction interface layer is located between the metal lithium negative electrode layer and the flexible polymer electrolyte layer, the electron conduction interface layer is made of at least one of gold, silver, zinc, magnesium, aluminum, platinum, silicon, tin and selenium, and the thickness of the electron conduction interface layer is 1-15 nm. The interface instability of the solid polymer electrolyteand the metal lithium negative electrode is solved, the short circuit of the battery is effectively prevented, and the cycle life of the battery is prolonged.

Description

[0001] (1) Technical field [0002] The invention belongs to the technical field of solid-state lithium batteries, and relates to a flexible solid-state battery and a preparation method thereof. [0003] (2) Background technology [0004] Due to its solid nature, solid electrolytes can replace traditional flammable and explosive organic electrolytes to build safe lithium batteries. Moreover, solid-state electrolytes have great potential to match metal lithium anodes to form all-solid-state lithium metal batteries, in which metal lithium anodes have a very high energy density of 3861mAh g -1 and the lowest reduction potential (-3.04V). Such a next-generation all-solid-state lithium metal battery has both high energy density and safety, and has great application prospects. However, the design of the interface between metal lithium anode and polymer electrolyte is still a key issue hindering the practical development of all-solid-state batteries. Due to the high reducibility of...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0565H01M4/38H01M10/0525H01M10/058
CPCH01M4/382H01M4/628H01M10/0525H01M10/0565H01M10/058H01M2004/027H01M2300/0094Y02E60/10Y02P70/50
Inventor 盛欧微金成滨陈媚郑家乐居治金张文魁陶新永
Owner ZHEJIANG UNIV OF TECH
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