All-solid-state thick-film lithium battery and preparation method thereof

An all-solid-state lithium battery technology, which is applied in the manufacture of electrolyte batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problems of low battery capacity, achieve small volume changes, high production efficiency, and improve ion diffusion capabilities.

Pending Publication Date: 2021-12-31
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the above-mentioned technical problems, the object of the present invention is to provide an all-solid-state thick-film lithium battery and its preparation method to solve the problem of low capacity of the existing all-solid-state thin-film lithium battery single cell

Method used

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  • All-solid-state thick-film lithium battery and preparation method thereof
  • All-solid-state thick-film lithium battery and preparation method thereof
  • All-solid-state thick-film lithium battery and preparation method thereof

Examples

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Embodiment 1

[0042] A method for preparing an all-solid-state thick-film lithium battery, comprising the following steps:

[0043] (1) The positive electrode active material LiCoO 2 , conductive carbon black, binder polyvinylidene fluoride and solid electrolyte Li 3 PO 4 Mix evenly in N-methylpyrrolidone liquid medium to make positive electrode slurry; wherein, the mass ratio of positive electrode active material, solid electrolyte, conductive agent and binder is: 8:0.5:0.5:1;

[0044] (2) The positive electrode slurry was printed on the positive electrode current collector aluminum foil by casting method printing equipment, then dried in a blast oven at 60°C for 6h, and then transferred to a vacuum oven at -0.1MPa and 110°C for 10h, Finally, it was flattened with a roller press to obtain a thick film positive electrode with a thickness of 95 μm;

[0045] (3) The electrolyte material LiPON is prepared on the thick film positive electrode with a thickness of 9 μm LiPON thin film electrol...

Embodiment 2

[0048] A method for preparing an all-solid-state thick-film lithium battery, comprising the following steps:

[0049] (1) The positive electrode active material LiMn 2 o 4 , conductive agent conductive carbon black, binder polyvinylidene fluoride and solid electrolyte LLTO are uniformly mixed in N-methylpyrrolidone liquid medium to prepare positive electrode slurry; among them, positive electrode active material, solid electrolyte, conductive agent and binder The mass ratio of the agent is: 4:3.5:1.5:1;

[0050] (2) The positive electrode slurry was printed on the positive electrode current collector aluminum foil by casting method printing equipment, then dried in a blast oven at 60°C for 6h, and then transferred to a vacuum oven at -0.1MPa and 110°C for 10h, Finally, it was flattened with a roller press to obtain a thick film positive electrode with a thickness of 120 μm;

[0051] (3) The electrolyte material LiPON is prepared on the thick film positive electrode by magne...

Embodiment 3

[0054] A method for preparing an all-solid-state thick-film lithium battery, comprising the following steps:

[0055] (1) The positive electrode active material LiFePO 4 , Conductive agent Conductive carbon black, binder polyvinylidene fluoride and solid electrolyte are uniformly mixed in N-methylpyrrolidone liquid medium to prepare positive electrode slurry; wherein, positive active material, solid electrolyte, conductive agent and binder The mass ratio is: 6:1.5:1.5:1, the solid electrolyte is a mixture of PAN and LiTFSI (AN and Li + The molar ratio is 4:1);

[0056] (2) Print the positive electrode slurry on the positive electrode current collector aluminum foil by screen printing equipment, then dry it in a blast oven at 60°C for 6h, then transfer it to a vacuum oven at -0.1MPa and 110°C for 10h, and finally Flatten with a roller press to obtain a thick film positive electrode with a thickness of 500 μm;

[0057] (3) The electrolyte material LLTO is prepared on the thic...

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Abstract

The invention discloses an all-solid-state thick-film lithium battery and a preparation method thereof. The battery comprises three core layers of a thick-film positive electrode, a thin-film electrolyte and a thick-film negative electrode, and the thick-film negative electrode is a double-phase lithium alloy or a compound formed by the double-phase lithium alloy and a three-dimensional conductive material. The preparation method of the battery comprises the following steps: firstly printing positive electrode slurry on a positive electrode current collector to prepare a thick film positive electrode, then preparing an electrolyte thin film on the thick film positive electrode through a vapor deposition method, finally preparing a thick film negative electrode through a melting method, and covering a negative electrode current collector to obtain the all-solid-state thick film lithium battery. The battery has relatively high electrode thickness, high monomer capacity and good cycling stability and rate capability.

Description

technical field [0001] The invention relates to the technical field of all-solid-state lithium batteries, in particular to an all-solid-state thick-film lithium battery and a preparation method thereof. Background technique [0002] Since the all-solid-state lithium battery does not contain any organic electrolyte, it can essentially solve the safety hazards faced by the existing liquid electrolyte-based lithium-ion batteries. Therefore, the industry agrees that the all-solid-state lithium battery is the most competitive next-generation secondary battery. candidates. In addition, all-solid-state lithium batteries also have the following advantages: high energy density, good cycle performance, long service life and good rate performance. But today, the size of all solid-state lithium batteries has not yet been commercialized. The main difficulties are: the ionic conductivity of solid electrolyte materials is low, and the gap between them and organic electrolytes is still lar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/058
CPCH01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 李晶泽白洋王子豪
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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