Low-internal-resistance all-solid-state battery and preparation method thereof

An all-solid-state battery, low internal resistance technology, used in electrolyte battery manufacturing, electrode manufacturing, secondary batteries and other directions, can solve the problem of high internal resistance of all-solid-state batteries, reduce the number of interfaces, have good interface contact, and suppress pole pieces. inflated effect

Active Publication Date: 2021-04-13
郑州中科新兴产业技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention proposes a low internal resistance all-solid-state battery and its preparation method, which solves the problem of large internal resistance of all-solid-state batteries

Method used

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  • Low-internal-resistance all-solid-state battery and preparation method thereof
  • Low-internal-resistance all-solid-state battery and preparation method thereof
  • Low-internal-resistance all-solid-state battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] In this example, the positive electrode layer, solid electrolyte layer, negative electrode layer and all-solid-state battery were prepared by the following steps:

[0033] (1) Integrated preparation of the positive electrode layer and the solid state layer: the positive electrode active material nickel cobalt lithium manganese oxide (NCM811), superconducting carbon black, and polyvinylidene fluoride are added to a mixture containing an appropriate amount of NMP according to the mass ratio of 97:1:2. In the solvent double planetary mixer, the wet homogenization process is adopted, the positive electrode active material is added in two batches, and the vacuum is stirred at a high speed. The solid content of the slurry is 70%, and the viscosity of the slurry is 8000mPa.s. Use a coating machine to coat the positive electrode slurry on the aluminum foil in an intermittent coating manner, and the coating surface density is 12.5 mg / cm 2 .

[0034] (2) The polymer polyethylene...

Embodiment 2

[0040] In this example, the positive electrode layer, solid electrolyte layer, negative electrode layer and all-solid-state battery were prepared by the following steps:

[0041] (1) Integrated preparation of the positive electrode layer and the solid state layer: the positive electrode active material lithium cobaltate (LCO), superconducting carbon black, and polyvinylidene fluoride are added to the medium with an appropriate amount of NMP solvent according to the mass ratio of 98:1:1. In the double planetary mixer, the wet homogenization process is adopted, and the positive electrode active material is added in two batches, and the vacuum high-speed stirring is carried out. The solid content of the slurry is 68%, and the viscosity of the slurry is 7000mPa.s. Coat the positive electrode slurry on the aluminum foil by intermittent coating with a coating machine, and the density of the coated surface is 20mg / cm 2 .

[0042] (2) Dissolve the polymer polyvinylidene fluoride and ...

Embodiment 3

[0048] In this example, the positive electrode layer, solid electrolyte layer, negative electrode layer and all-solid-state battery were prepared by the following steps:

[0049] (1) Integrated preparation of the positive electrode layer and the solid layer: the positive active material lithium iron phosphate (LFP), superconducting carbon black, and polyvinylidene fluoride are added to a medium with an appropriate amount of NMP solvent according to the mass ratio of 98:1:1. In the double planetary mixer, the wet homogenization process is adopted, and the positive electrode active material is added in two batches, and the vacuum high-speed stirring is carried out. The solid content of the slurry is 69%, and the viscosity of the slurry is 9000mPa.s. Use a coating machine to coat the positive electrode slurry on the aluminum foil in an intermittent coating manner, and the coating surface density is 18 mg / cm 2 .

[0050] (2) The polymer polyvinyl carbonate and lithium salt LiPF ...

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Abstract

The invention provides a low-internal-resistance all-solid-state battery and a preparation method thereof. The low-internal-resistance all-solid-state battery comprises a positive electrode layer and a composite negative electrode layer, a solid electrolyte layer is arranged between the positive electrode layer and the composite negative electrode layer, the solid electrolyte layer and the positive electrode layer are integrally prepared through solidification, and the composite negative electrode layer comprises a negative electrode layer and a buffer layer; the buffer layer is composed of hard carbon and a conductive polymer, and the buffer layer and the negative electrode layer are integrally prepared. The hard carbon and the conductive polymer are used as the buffer layer, so that the problem of pole piece expansion in the charging and discharging process of the negative electrode is inhibited, the negative electrode is in good interface contact with the solid electrolyte, the interface stability between the solid electrolyte and the negative electrode is improved, and the interface internal resistance is reduced.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a low internal resistance all-solid-state battery and a preparation method thereof. Background technique [0002] Traditional lithium-ion batteries use liquid organic electrolytes as electrolytes, which pose a great safety hazard when storing electricity in large capacities. Therefore, the development of all-solid-state lithium batteries is the first choice to fundamentally solve the safety problem of lithium-ion batteries. Generally, an all-solid-state lithium battery consists of positive and negative electrodes and a solid electrolyte between the positive and negative electrodes. Solid electrolytes are the core components of solid-state batteries. Among them, sulfide solid electrolytes have high ionic conductivity at room temperature, but the preparation process has strict environmental requirements; oxide solid electrolytes have good mechanical properties and high ionic conductivity, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/052H01M10/058H01M4/62H01M4/36H01M4/04
CPCH01M4/0407H01M4/366H01M4/62H01M4/625H01M10/052H01M10/0565H01M10/058H01M2004/027H01M2300/0082Y02E60/10Y02P70/50
Inventor 刘艳侠张涛高文超杨幸遇秦盼盼赵冲冲
Owner 郑州中科新兴产业技术研究院
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