High-capacity all-solid-state battery and preparation method thereof

An all-solid-state battery, high-capacity technology, used in lithium batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve problems such as increasing the difficulty of manufacturing, poor wettability of metal lithium, and increasing manufacturing costs.

Pending Publication Date: 2021-11-23
星恒电源(滁州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The overall performance of the sulfide electrolyte solid-state battery is the best among the three batteries at present. Its texture is relatively soft, and it has even higher ionic conductivity than the traditional liquid electrolyte. However, the sulfide electrolyte is easily compatible with water and oxygen in the air. Waiting for the reaction to produce toxic gas, which virtually increases the difficulty of its manufacture and greatly increases the manufacturing cost
Metal lithium in the oxide electrolyte has poor wettability. When the battery is deposited unevenly during the continuous charge and discharge cycle, lithium dendrites are easy to form.

Method used

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  • High-capacity all-solid-state battery and preparation method thereof
  • High-capacity all-solid-state battery and preparation method thereof

Examples

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Effect test

Embodiment 1

[0022] A large-capacity all-solid-state battery, including a positive electrode, a solid electrolyte, and a negative electrode, without electrolyte and diaphragm; its preparation method is as follows:

[0023] According to the mass ratio of 80:5:5:10, the lithium compound LFP, the conductive agent Super P, the binder PVDF, and the ion conductive agent are mixed, NMP is added to form a slurry, and then coated on the surface of the aluminum foil, and then dried and rolled , to obtain a positive electrode with a thickness of 150 μm;

[0024] According to the weight ratio of PEO, LATP, LAGP is 3:3.5:3.5, and the molar ratio of EO / Li is 14:1, mix PEO, LATP, LAGP, lithium salt LiTFSI, then add acetonitrile to get a slurry, and then coat Put the side of the positive electrode with the lithium compound, and then dry (75°C) to obtain a positive electrode, solid electrolyte (50μm) integrated sheet;

[0025] In the glove box, put a lithium foil on the surface of the solid electrolyte of...

Embodiment 2

[0027] Put lithium foil on the surface of the solid electrolyte of the positive electrode and solid electrolyte integrated sheet in Example 1, then seal it with aluminum-plastic film and lead out the positive and negative electrodes, then pump air, and finally heat press at 55°C for 1 minute to obtain a soft package with a large capacity. Solid-state batteries do not need to add electrolyte or separator between layers.

Embodiment 3

[0029] The positive electrode solid electrolyte integrated sheet and lithium foil of Example 1 are stacked at intervals (the solid electrolyte is in contact with the lithium foil, which is a conventional structure) to form a multi-layer structure, in which the integrated sheet and lithium foil have fifteen layers each, and then aluminum-plastic film Seal the package and lead out the positive and negative electrodes, then pump air, and finally heat press at 60°C for 90 seconds to obtain a soft-packed large-capacity all-solid-state battery. There is no need to add electrolyte or separator between layers. The actual picture is shown in figure 1 (Length and width dimensions are 115*103mm), charge and discharge curve see figure 2 , it can be seen that the positive electrode and electrolyte of the present invention are combined with metal lithium to form a battery, which can have an excellent charge and discharge curve, a lower charging platform and a higher discharging platform, fo...

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Abstract

The invention discloses a high-capacity all-solid-state battery and a preparation method thereof. The preparation method comprises the steps: mixing an active component and a solvent to prepare slurry, coating a metal base foil with the slurry, removing the solvent, and obtaining a positive electrode; mixing PEO, LATP, LAGP, a lithium salt and a wetting agent to prepare a coating; coating the coating on the positive electrode, removing the wetting agent, and compounding with the negative electrode to obtain the high-capacity all-solid-state battery. LATP / LAGP cannot be prepared into a compact and uniform electrolyte membrane, and the contact wettability between the LATP / LAGP and an electrode material is relatively poor, so the transmission of lithium ions is hindered, and the performance of the battery is reduced. The PEO, the LATP and the LAGP are compounded to prepare the composite solid electrolyte, lithium ions can be conducted along the surface and can also penetrate through the solid electrolyte to be conducted, high ionic conductivity, thermal stability and a wide electrochemical window can be achieved, the grain boundary resistance of the solid electrolyte is reduced, and the conductivity of the electrolyte and the safety of a battery are improved.

Description

technical field [0001] The invention belongs to battery technology, and in particular relates to a large-capacity all-solid-state battery and a preparation method thereof. Background technique [0002] Lithium batteries commonly used in the existing market are polymer lithium batteries, which contain flammable electrolytes and PE / PP diaphragms and other materials, which are prone to fire and cause danger when subjected to high temperature and external mechanical damage. The emergence of solid-state batteries abandons the traditional liquid electrolyte and uses solid-state electrolytes to achieve ion conduction in batteries. In the manufacture of solid-state batteries, the ionic conductivity of the positive electrode and the electrolyte is the most important, while the internal resistance of the interface is the second most important. The existing solid-state batteries use polymers, inorganics and sulfides as three main directions. Polymer solid state: The current mainstrea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/052
CPCH01M10/052H01M10/0565H01M2300/0085Y02E60/10
Inventor 姚凡
Owner 星恒电源(滁州)有限公司
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