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Printing-like integrated all-solid-state lithium metal battery and preparation method thereof

A lithium metal battery, all-solid-state technology, used in lithium batteries, electrolyte battery manufacturing, secondary batteries, etc., can solve the problems of ionic conductivity, mechanical strength and electrode interface compatibility, and achieve good interface compatibility, The effect of high lithium ion conductivity and easy synthesis

Active Publication Date: 2020-07-03
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there is a lot of research work on solid-state batteries at home and abroad, but they cannot take into account the ionic conductivity, mechanical strength, and compatibility with the electrode interface. 4-10

Method used

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  • Printing-like integrated all-solid-state lithium metal battery and preparation method thereof
  • Printing-like integrated all-solid-state lithium metal battery and preparation method thereof
  • Printing-like integrated all-solid-state lithium metal battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1: Preparation of the precursor solution of the negative electrode SEI film (SEI-PS-1). 1,2-ethanedithiol (EDT, formula I (R: C2)) and diethylene glycol divinyl ether (DGDE, formula II (n=2)) are reactive monomers, bistrifluorosulfonyl Lithium amide (LiTFSI, formula V(a)) is a small molecule lithium salt, 2,2-dimethoxy-2-phenylacetophenone (DMPA) is used as a photoinitiator, and anhydrous THF is used as a solvent.

[0044] The following operations are all carried out in the glove box: add EDT and DGDE according to a certain ratio in a 20mL small glass bottle, add an appropriate amount of THF, then add DMPA, stir in the dark to completely dissolve, and trigger the reaction under 365nm ultraviolet light irradiation The obtained thiol-terminated linear polyether sulfide (ETE-x), which is used as the precursor solution (SEI-PS-1) for the negative electrode SEI membrane, is ready for use.

[0045] In the ETE-x, x is preferably 5-20.

[0046] The molar ratio of the ...

Embodiment 2

[0048] Example 2: Preparation of precursor solution of negative electrode SEI film (SEI-PS-2). EDT and DGDE are reactive monomers, lithium hexafluorophosphate (LiPF 6 , Formula V (b)) is a small molecule lithium salt, DMPA is a photoinitiator, and anhydrous THF is a solvent.

[0049] Except for the change of the small molecule lithium salt, the dosage and operation steps of each reagent are the same as in Example 1.

[0050] In the ETE-x, x is preferably 5-20.

[0051] The molar ratio of the EO / ES segment to the lithium salt is: [EO / ES] / Li + = 15 / 1.

[0052] The sample number of the precursor solution of the negative electrode SEI film is SEI-PS-2.

Embodiment 3

[0054] Example 3: Preparation of a precursor solution of a polymer solid electrolyte (SPE-PS-1). Vinyl ether (EVE, formula III (a)) is a capping agent, triallylamine (TAA, formula IV (b)) is a crosslinking agent, LiTFSI is a small molecule lithium salt, DMPA is a photoinitiator, and no Aqueous THF was used as solvent.

[0055] The following operations were all carried out in a glove box with a high-purity argon atmosphere, and were divided into two steps. Step 1: Add an appropriate amount of ETE-x prepared in Example 1 into a 20mL small glass bottle, add the end-capping agent EVE, add an appropriate amount of DMPA, stir in the dark to completely dissolve, and trigger the reaction under 365nm ultraviolet light irradiation to prepare Obtain a linear polyether sulfide bulk plasticizer (PSP-1); the second step: put ETE-x, TAA, PSP-1, LiTFSI, DMPA and an appropriate amount of THF in a 20mL small glass bottle, and stir it in the dark to make it Dissolve completely, obtain the prec...

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Abstract

The invention discloses a printing-like integrated all-solid-state lithium metal battery and a preparation method thereof. The printing-like integrated all-solid-state lithium metal battery is formedby printing layer by layer according to the sequence of a lithium negative electrode SEI membrane, a solid polymer electrolyte membrane and a positive electrode. The printable integrated all-solid-state lithium metal battery prepared by the invention has the advantages of high lithium ion conductivity, good interface compatibility, simple preparation process, printable production, cheap and easilyavailable raw materials and the like. The printable integrated all-solid-state lithium metal battery designed by the invention is high in discharge capacity and good in cycle performance.

Description

technical field [0001] The invention belongs to the field of solid-state batteries, and in particular relates to a printable integrated all-solid-state lithium metal battery and a preparation method thereof. Background technique [0002] Due to its ultra-high theoretical specific capacity (3840mAh g -1 ), lower density (0.534g cm -3 ) and the lowest potential (-3.04V), it is an ideal material for the anode of the new generation of lithium batteries. However, side reactions occur between the lithium metal negative electrode and the organic electrolyte, which consumes the active material and shortens the service life of the battery; the uneven deposition of lithium ions on the surface of the negative electrode will cause the growth of lithium dendrites, which can easily pierce the separator and cause a short circuit of the battery , causing serious security problems 1 . Moreover, the traditional "electrolyte-diaphragm" battery system uses an organic electrolyte with a low ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M10/0565H01M10/058
CPCH01M10/052H01M10/0565H01M10/058H01M2300/0082Y02E60/10Y02P70/50
Inventor 孟跃中钟雷李志峰王天羿肖敏王拴紧韩东梅任山
Owner SUN YAT SEN UNIV
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