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All-solid-state thick-film lithium battery with alloy interface layer and preparation method of all-solid-state thick-film lithium battery

An all-solid-state, lithium battery technology, used in lithium batteries, electrolyte battery manufacturing, secondary batteries, etc., can solve the problems of direct contact between positive and negative electrodes, lack of thick-film negative electrodes, complicated processes, etc., to reduce impact, volume and The effect of smooth change of surface tension and simple process

Pending Publication Date: 2022-08-02
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can improve the interface to a certain extent, but the process is cumbersome and complicated, and the negative electrode-electrolyte interface formed by pressing also has problems such as interface mismatch and interface gaps, and this method is not suitable for thin-film electrolytes, which are brittle in texture and only a few times thicker. A few microns, it is easy to be damaged during the pressing process, forming a direct contact between the positive and negative electrodes, resulting in a short circuit of the battery
[0005] Therefore, the prior art lacks a preparation method that can efficiently and high-quality prepare thick-film anodes on thin-film electrolytes, and at the same time enable the thick-film anode-electrolyte film interface to form a dense contact

Method used

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  • All-solid-state thick-film lithium battery with alloy interface layer and preparation method of all-solid-state thick-film lithium battery
  • All-solid-state thick-film lithium battery with alloy interface layer and preparation method of all-solid-state thick-film lithium battery
  • All-solid-state thick-film lithium battery with alloy interface layer and preparation method of all-solid-state thick-film lithium battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This embodiment provides an all-solid-state thick-film lithium battery with an alloy interface layer, the structure is as follows figure 1As shown, among them: 1. Positive electrode current collector; 2. Thick film positive electrode; 3. Electrolyte film; 4. Alloy interface layer; 5. Thick film negative electrode; 6. Negative electrode current collector. The molten lithium reacts with the metal thin film layer to form a lithium alloy interface layer, and simultaneously forms a thick-film lithium negative electrode integrated with the alloy interface layer after cooling.

[0037] Its preparation method includes:

[0038] (1) The active material LiFePO 4 , Conductive agent acetylene black, binder polyethylene oxide and solid electrolyte LLZO are mixed evenly in the solvent, the positive electrode paste is printed on the positive current collector aluminum foil by the casting method printing equipment, and vacuum dried to obtain a 180 μm thick film positive electrode ; ...

Embodiment 2

[0043] This embodiment provides an all-solid-state thick-film lithium battery with an alloy interface layer, the preparation method of which includes:

[0044] (1) The active material LiFePO 4 , Conductive agent acetylene black, binder polyethylene oxide and solid electrolyte LLZO are mixed evenly in the solvent, the positive electrode paste is printed on the positive current collector aluminum foil by the casting method printing equipment, and vacuum dried to obtain a 180 μm thick film positive electrode ;

[0045] (2) 6 μm LLZO thin films were prepared on the thick film cathode by magnetron sputtering;

[0046] (3) A 500 nm Ag interface layer was prepared on the thin film electrolyte by magnetron sputtering;

[0047] (4) Under the condition that the Ag layer is kept at 300°C, the molten metal lithium is poured on the Ag interface layer, and the amount of poured metal lithium is controlled. A lithium alloy interface layer is formed, and a thick-film anode having an integra...

Embodiment 3

[0051] This embodiment provides an all-solid-state thick-film lithium battery with an alloy interface layer, the preparation method of which includes:

[0052] (1) The active material LiFePO 4 , Conductive agent acetylene black, binder polyethylene oxide and solid electrolyte LLZO are mixed evenly in the solvent, the positive electrode paste is printed on the positive current collector aluminum foil by the casting method printing equipment, and vacuum dried to obtain a 180 μm thick film positive electrode ;

[0053] (2) Preparation of 8 μm Li on the thick-film cathode by electron beam evaporation 3 PO 4 film;

[0054] (3) A 1 μm Mg interface layer was prepared on the thin film electrolyte by magnetron sputtering;

[0055] (4) Under the condition of keeping the Mg layer at 250 °C, pour the molten metal lithium on the Mg interface layer, and control the amount of the poured metal lithium. A lithium alloy interface layer is formed, and a thick-film anode having an integrated...

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Abstract

The invention discloses an all-solid-state thick-film lithium battery with an alloy interface layer and a preparation method of the all-solid-state thick-film lithium battery, and belongs to the technical field of all-solid-state batteries. The all-solid-state thick-film lithium battery comprises a thick-film positive electrode, an electrolyte film, an alloy interface layer and a thick-film negative electrode, the preparation method comprises the following steps: preparing the metal film layer on the electrolyte film with the thickness of 1-9 microns by adopting a vapor deposition method; and molten lithium is poured on the metal film layer at the temperature of 200-350 DEG C, then cooling is performed at the speed of 1-20 DEG C / min, and the alloy interface layer and the thick film negative electrode which are of an integrated structure are formed in situ. According to the preparation method, the thick-film negative electrode can be efficiently prepared on the electrolyte film with high quality, meanwhile, compact interface contact is formed, the high ion conduction characteristic is achieved, growth of lithium dendrites can be inhibited, and the electrolyte films on the two sides are in compact contact with the thick-film negative electrode.

Description

technical field [0001] The invention belongs to the technical field of all-solid-state batteries, in particular to an all-solid-state thick-film lithium battery with an alloy interface layer and a preparation method thereof. Background technique [0002] All-solid-state batteries have high safety, high energy density, good cycle performance, long service life, and good rate performance. They are the most potential battery type to replace existing high-energy-density lithium-ion batteries. In order to obtain a cell capacity close to that of liquid batteries, bulk solid-state batteries with electrodes and electrolytes of several hundreds of microns in thickness are promising candidates, but bulk solid-state batteries suffer from poor electrode-electrolyte contact, large interfacial impedance, and bulky negative electrodes. Problems such as big changes hinder its industrialization development. All-solid-state thin-film lithium battery is currently the only all-solid-state batt...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/052H01M10/0562
CPCH01M10/052H01M10/058H01M10/0562Y02E60/10Y02P70/50
Inventor 李晶泽谢佳王弘毅周爱军
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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