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All solid lithium ion battery and preparation method thereof

A lithium-ion battery, all-solid-state technology, applied in the field of lithium-ion battery preparation technology, can solve problems such as being unsuitable for large-scale production and complex process

Active Publication Date: 2018-03-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem of poor interface contact can be reduced to a certain extent by coating a highly conductive adhesive at the interface or hot pressing or overall sintering, but the process is relatively complicated and not suitable for large-scale production

Method used

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  • All solid lithium ion battery and preparation method thereof
  • All solid lithium ion battery and preparation method thereof
  • All solid lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 As shown, the inkjet printing all-solid-state lithium-ion battery is composed of positive electrode current collector 1, negative electrode current collector 6, inorganic nanofiller 3, solid electrolyte film layer 4, solid electrolyte particles 7, positive electrode active material 2, and negative electrode active material 5. Each structural unit of the all-solid-state lithium-ion battery is printed by inkjet, and the content of the solid electrolyte in the positive and negative electrodes varies in a gradient in the longitudinal direction.

Embodiment 2

[0028] In the process of inkjet printing, the longitudinal gradient distribution of the solid electrolyte on the electrode: from 50wt.% on the side close to the current collector to 10wt.% on the side close to the middle solid electrolyte film layer, the gradient decreases, and the gradient distribution in the longitudinal direction can maximize The reduced interfacial impedance is beneficial to the migration of lithium ions and improves the electrochemical performance of all-solid-state lithium-ion batteries. Under this gradient change, the capacity properties of active materials can be maximized.

Embodiment 3

[0030] Inkjet printing combined with physical vapor deposition to prepare all-solid-state lithium-ion batteries. The positive electrode active material uses lithium nickelate, and the negative electrode active material uses lithium titanate, PEO-LiClO 4 -TiO 2 Electrolyte as a solid electrolyte membrane layer material, TiO 2 As an inorganic filler, DMF is used as a solvent to prepare the slurry of each component. The computer designs the inkjet time and sequence of each component in the vertical direction during the printing process, and controls the doping amount of inorganic nano-fillers in the positive and negative electrodes to 5wt.%. , the doping amount in the solid electrolyte membrane layer is 10wt.%, and the thickness of the solid electrolyte membrane layer is 100 μm; after the components are fully dried, use vacuum evaporation technology to vacuum evaporate the aluminum current collector coating on the positive side, and the negative electrode Copper current collecto...

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Abstract

The invention discloses an all-solid-state lithium-ion battery and a preparation method thereof. The all-solid-state lithium-ion battery is prepared by using inkjet printing technology, and different components are dissolved in a solvent to prepare a slurry, which is placed in different ink cartridges, and the slurry is prepared by using a computer. Program design, vertically graded gradient printing of electrodes and electrolytes, electrolyte gradient changes in the electrode pole piece, the gradient structure distribution of the electrolyte in the pole piece can reduce the interface impedance of the electrode active material / electrolyte, which is conducive to the deep conduction of lithium ions, the largest Make full use of the capacity properties of active materials; the all-solid-state lithium-ion battery structure prepared by inkjet printing, except for the current collector, other parts form a whole laminated structure, in which the components are in close contact and regularly arranged, and the interface The impedance is much lower than the all-solid-state lithium-ion battery prepared by mechanical lamination. The inkjet printing method is convenient and fast, and is suitable for large-scale production.

Description

technical field [0001] The invention relates to a preparation process of a lithium-ion battery, in particular to an all-solid-state lithium-ion battery and a process for preparing the all-solid-state lithium-ion battery by inkjet printing. Background technique [0002] As a next-generation energy storage power source, all-solid-state lithium-ion batteries have attracted increasing attention due to their high energy density, good mechanical properties, excellent electrochemical stability, and non-flammability. The structure of the all-solid-state lithium-ion battery is similar to that of the traditional liquid electrolyte lithium-ion battery. It is mainly composed of positive and negative electrodes and a solid electrolyte. The solid electrolyte is divided into inorganic solid electrolyte and organic solid electrolyte. The inorganic solid electrolyte has high lithium ion conductivity at room temperature and low temperature. The performance is good, but the interface stability...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M10/0562H01M10/058
CPCH01M10/0525H01M10/0562H01M10/058H01M2300/0068Y02E60/10Y02P70/50
Inventor 高云智付传凯李琴张瀚曹毅
Owner HARBIN INST OF TECH
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