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3D printed solid-state battery and preparation method and application thereof

A 3D printing, solid-state battery technology, used in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve the problems of material rupture, electrical performance, battery diving, recession, etc., to improve lithium ion transmission, reduce raw material waste, and prepare simple method effect

Pending Publication Date: 2022-02-18
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the invention is sintered, the interface modification layer will have the disadvantage of not being closely bonded to the metal negative electrode interface, so the interface resistance will be increased.
[0005] CN110518278A discloses a solid electrolyte with a negative electrode interface layer, a preparation method and a solid battery. The surface of the solid electrolyte has a liquid metal alloy layer, and the liquid metal alloy layer modifies the negative electrode interface where the solid electrolyte contacts the lithium metal negative electrode. After the solid-state electrolyte is assembled into a solid-state battery, the transition effect of the liquid metal alloy layer can improve the solid-solid compatibility problem between the lithium metal negative electrode and the solid-state electrolyte material interface, and reduce the interface resistance, but the amount of electrolyte added Insufficient electrolyte will cause the battery to dive late in the cycle, while too much electrolyte will reduce the safety performance of the battery
However, under external pressure, material rupture and electrical performance degradation may occur, which is not conducive to the long-term cycle of the battery

Method used

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  • 3D printed solid-state battery and preparation method and application thereof
  • 3D printed solid-state battery and preparation method and application thereof
  • 3D printed solid-state battery and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] This embodiment provides a method for preparing a 3D printed solid-state battery:

[0049] (1) Preparation of the positive pole piece: 3.5wt% of the binder polyvinylidene fluoride, 5% of polyethylene oxide and the positive solvent N-methylpyrrolidone were evenly mixed to prepare a glue solution, the rotation speed was 1000rpm, and the mixture was stirred for 7.5min. Positive electrode active material lithium iron phosphate 75wt%, electronic conductive agent conductive carbon black 7.5wt%, ion conductive agent succinonitrile 6%, lithium salt LiTFSI 3%, mix and stir with the above glue and positive electrode solvent evenly, rotate at 1000rpm, stir for 7.5min , the positive electrode slurry with a solid content of 35% can be obtained. Then, the positive electrode slurry was evenly coated on both sides of the aluminum foil of the positive electrode current collector, with a thickness of 150 μm, and the required positive electrode sheet was obtained through steps such as dry...

Embodiment 2

[0055] This embodiment provides a method for preparing a 3D printed solid-state battery:

[0056] (1) Preparation of the positive pole piece: 2 wt% of the binder polyvinylidene fluoride, 4% of polyethylene oxide and the positive solvent N-methylpyrrolidone were evenly mixed to prepare a glue solution, the rotation speed was 800 rpm, and the mixture was stirred for 10 min. Mix 70wt% of lithium manganate as the positive active material, 10wt% of conductive graphite as an electronic conductive agent, 10% of succinonitrile as an ion conductive agent, and 4% of lithium salt LiTFSI with the above glue and positive electrode solvent, mix and stir evenly at 800rpm, and stir for 10min. A positive electrode slurry with a solid content of 20% was obtained. Then, the positive electrode slurry was evenly coated on both sides of the aluminum foil of the positive electrode current collector, with a thickness of 100 μm, and the required positive electrode sheet was obtained through steps such...

Embodiment 3

[0062] This embodiment provides a method for preparing a 3D printed solid-state battery:

[0063] (1) Preparation of the positive pole piece: 5 wt% of the binder polyvinylidene fluoride, 6% of polyethylene oxide and the positive solvent N-methylpyrrolidone were evenly mixed to prepare a glue solution, the rotation speed was 1200 rpm, and the mixture was stirred for 5 min. The positive electrode active material lithium cobaltate 73wt%, the electronic conductive agent carbon fiber 10wt%, the ion conductive agent succinonitrile 2%, the lithium salt LiTFSI 4%, mix and stir with the above-mentioned glue and positive electrode solvent evenly, the rotation speed is 1200rpm, stir for 5min, you can get A positive electrode slurry with a solid content of 50%. Then, the slurry was evenly coated on both sides of the positive electrode current collector aluminum foil, with a thickness of 200 μm, and the required positive electrode sheet was obtained through steps such as drying, rolling, a...

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Abstract

The invention provides a 3D printed solid-state battery and a preparation method and application thereof. The 3D printed solid-state battery comprises a positive pole piece, a negative pole piece and a solid-state electrolyte located between the positive pole piece and the negative pole piece, wherein the positive pole piece comprises the following raw materials in percentage, by mass, 70-80% of a positive active material, 5-10% of an electronic conductive agent, 2-10% of an ionic conductive agent, 2-4% of LiTFSI, 1.5-5% of polyvinylidene fluoride, 4-6% of polyoxyethylene and a positive solvent; and the solid content of raw materials of the positive pole piece accounts for 20-50% of the solid content of the positive solvent. The 3D printing technology is adopted, the solid electrolyte with precise surface appearance and internal structure is designed, interface contact between the electrolyte and an electrode is improved, ion transfer between the electrode and the electrolyte is improved, and in addition, lithium ion transmission between the positive electrode and the solid electrolyte is improved by combining with a polymer composite positive electrode added with polyoxyethylene.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, and relates to a 3D printed solid-state battery and a preparation method and application thereof. Background technique [0002] In recent years, due to the increasing demand for energy, electrochemical energy storage has become the most widely used energy storage technology. Among them, lithium-ion batteries have become one of the focuses of research because of their high energy density and long cycle life. With the continuous optimization of lithium-ion battery technology, there is an increasing demand for the energy density of lithium-ion batteries. Due to the high specific capacity and low electrochemical potential, the energy density can be increased by about 50% theoretically by using lithium metal instead of graphite anode. At present, traditional lithium-ion batteries still use organic liquid electrolytes. Although they have high ionic conductivity and good electrode wettability, the...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/62H01M10/058
CPCH01M10/0525H01M4/622H01M10/058Y02E60/10Y02P70/50
Inventor 向津萱陈规伟冀亚娟
Owner EVE ENERGY CO LTD
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